Papers
Info
Aerodynamic characterization of the 516 Arouca Pedestrian suspension Bridge over the Paiva River
Given the 516 Arouca pedestrian suspension bridge
Year: 2023
Number Pages:
18 pp.
Author(s): Marques da Silva, F.
: Wind
Editor: MDPI
Volume:
3.
DOI:
10.3390/wind3010006
Keywords: wind tunnel; wind loading; suspended bridges
Info
Harmonised procedure to update thermal loads in the Eurocodes. Case study for Italy
The characteristic values of temperature corresponding to the maximum and minimum shade air temperature with an annual probability of being exceeded 0.02, used in the European construction standard for thermal actions (EN 1991-1-5:2003), are usually assessed at a country level and included in the National Annexes to that Eurocode part.The paper aims to support national authorities on elaborating maps for thermal actions using publicly available datasets, consistent at a European level, and harmonised modelling approaches. In addition, these datasets are continuously updated, reflecting the current climate and capturing potential global warming variations.The work investigates how updates in data and modelling could affect the characteristic values currentlyadopted in the Italian National Annexes to the Eurocodes. The main results show that: (i) the currently adoptednumber and locations of the weather stations result fairly representative of the patterns detected by exploitingadditional datasets; ii) the statistical method plays an essential role in the assessment of characteristic values, i.e., the method adopted in the current Italian standard evaluates more conservative characteristic values of maximum temperature than Gumbel or Generalized Extreme Value distributions, but could err on the unsafe side for minimum ones; (iii) both E-OBS and ERA5-Land datasets represent two optimal products to be used as a common source of temperature values at European scale; (iv) moving towards an updated period for temperature data results on an increase of characteristic values of maximum temperature and limited variations in spatial extent and magnitude of characteristic values of minimum ones.
Year: 2023
Number Pages:
15p..
Author(s): Rianna, G.; Reder, A.; Luísa Sousa, M.; Dimova, S.
: Climate Services
Editor: Elsevier
Volume:
Volume 30.
Keywords: Thermal load maps; Reanalysis; Eurocodes; Climatic actions; Climate change
Info
Experimental and numerical evaluation of the wind load on the 516 Arouca pedestrian suspension bridge
The present work analyses the wind load effects on the 516 Arouca bridge, the world's longest pedestrian suspension bridge in 2020. Computational fluid dynamics (CFD) was used to model a range of wind incidence angles between -8
Year: 2022
Number Pages:
13pp.
Author(s): Tadeu, A.; Marques da Silva, F.; Ramezani, B.; Romero, A.; Skerget, L.; Bandeira, F.
: Journal of Wind Engineering and Industrial Aerodynamics
Editor: Elsevier
Volume:
220.
Keywords: wind load; suspension bridge; wind tunnel; CFD
Info
Risk and resilience assessment of Lisbon
The safety and resilience of school buildings against natural disasters is of paramount importance since schools represent a reference point for communities. Such significance is not only related to the direct consequences of collapse on a vulnerable part of the population, but also due to the importance of schools in the post-disaster recovery. This work is focused on the risk and resilience assessment of school buildings in Lisbon (Portugal) under seismic events. The results of this study, in which a subset of 32 schools are analyzed, are used to define a prioritization strategy to mitigate the seismic risk of the Lisbon City Council school building portfolio and to assess the overall resilience of the school network. Numerical modeling of the school buildings is performed in order to estimate losses in terms of the built-up area of the schools and recovery times associated with different seismic scenarios, which are probabilistically defined specifically for the sites of the buildings, accounting for the local soil conditions and associated amplification effects. Based on the obtained risk estimates, which are compared to reference values established on international guidelines and specialized literature, the Lisbon City Council and LNEC jointly defined a short- and medium-term risk mitigation plan, starting with a detailed inspection and assessment of the most vulnerable school buildings and continuing to the implementation of retrofitting measures.
Year: 2022
Number Pages:
28p.
Author(s): Ribeiro, F.; Candeias, P.; Correia, A.A.; Carvalho, A. M.; Campos Costa, A.
: Applied sciences
Editor: MDPI journals
Volume:
Vol.12, Issue 17.
Keywords: Recovery planning; Emergency; Decision-making; Numerical modeling; Scenario-based analysis; Risk mitigation; Resilience; Seismic risk;
Info
Aspetos gerais da aplicação em Portugal do Eurocódigo 8
Procuram-se sintetizar neste artigo os principais aspetos relacionados com a avaliação e a reabilitação sísmica de edifícios existentes de alvenaria, compatibilizando a NP EN 1998-3:2017 com os respetivosAnexo C, específico para edifícios de alvenaria, e Anexo Nacional, específico para Portugal.A avaliação sísmica é um procedimento quantitativo através do qual se verifica se um edifício existente, danificado ou não, satisfaz os requisitos de desempenho, definidos por uma combinação de um estado limite com um nível de ação sísmica, através de critérios de conformidade. Neste procedimento estão envolvidos a definição da ação sísmica, a modelação da estrutura, os métodos de análise para determinação dos efeitos das ações e as verificações de segurança. São abordados os métodos de análise, dois lineares e dois nãolineares, aplicáveis a edifícios existentes de alvenaria, bem como as recomendações específicas do Anexo C e as informações complementares do Anexo Nacional.
Year: 2020
Number Pages:
99-120pp.
Author(s): Candeias, P.; Correia, A.A.; Campos Costa, A.; Catarino, J. M.; Pipa, M.; Cruz, H.; Cansado Carvalho, E.; Costa, A.
: Revista Portuguesa de Engenharia de Estruturas (rpee)
Editor: LNEC
Volume:
Série III, N.º 12.
Keywords: Eurocódigo 8; Avaliação sísmica; Edifícios de alvenaria existentes
Info
Assessment of seismic vulnerability of non-seismically designed unreinforced masonry buildings through shake table testing
The response of three full-scale unreinforced masonry buildings, without specific seismic detailing, as observed in shake table testing at LNEC for a seismic action representative of induced seismicity, is presented. The first building specimen simulated the upper floor and roof of the end-unit of a two-storey terraced house, built with unreinforced cavity walls, a reinforced concrete slab and a pitched timber roof. The second specimen was a replica of the roof of the first building. The third specimen represented instead a one-story detached pre-1940
Year: 2020
Number Pages:
89-98pp.
Author(s): Correia, A.A.; Mera Marques, A.; Campos Costa, A.; Candeias, P.; Bernardo, V.; Tomassetti, U.; Graziotti, F.; Kallioras, S.
: Revista Portuguesa de Engenharia de Estruturas (rpee)
Editor: LNEC
Volume:
Série III, N.º 12.
Keywords: Collapse; Limit states; Induced seismicity; Full-scale shake table test; Unreinforced masonry building
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Métodos expeditos para avaliação sísmica de edifícios de alvenaria com pavimentos rígidos
A avaliação da segurança sísmica de edifícios existentes de alvenaria tem como referência os procedimentos dispostos na NP EN 1998-3:2017 (Anexo C) e o respetivo Anexo Nacional, que estabelecem os requisitos de desempenho e os critérios de conformidade para edifícios existentes sujeitos a um determinado nível de ação sísmica. No seguimento das exigências regulamentares, e à luz da verificação da segurança à ação sísmica preconizada na norma, realizaram-se análises probabilísticas de vulnerabilidade sísmica e fiabilidade estrutural a um grande conjunto de edifícios de alvenaria representativos do parque habitacional, que conduziram ao desenvolvimento de métodos expeditos para a avaliação sísmica em alternativa à verificação pelo método de referência. Os métodos propostos permitem avaliar a resistência sísmica de edifícios de alvenaria com pavimentos rígidos, sem recurso a análises numéricas e recorrendo apenas a parâmetros geométricos (Método I) ou em conjunto com as propriedades mecânicas dos materiais (Método II).
Year: 2020
Number Pages:
111-128pp.
Author(s): Bernardo, V.; Campos Costa, A.; Costa, A.; Catarino, J. M.; Candeias, P.
: Revista Portuguesa de Engenharia de Estruturas (RPEE)
Editor: LNEC, APEE, GPBE e SPES
Volume:
Série III, Nº 14.
Keywords: Métodos expeditos; Avaliação sísmica; Pavimentos rígidos; Edifícios existentes de alvenaria
Info
Modulus of elasticity of mortars: Static and dynamic analyses
The analysis and control of deformability of wall coating mortars contributes to minimize crack development and propagation, one of the most common anomalies in building facades. Many of these cracks appear due to internal stresses in the coating mortar, because of imposed deformations or of imposed restrictions by the substrate. These deformability studies should include one or more experimental methods to determine the modulus of elasticity (E) of the coating mortars in question. There are two approaches to experimentally determine E for mortar specimens: static and dynamic experimental methodologies. For civil engineering applications, the results obtained from static methodologies are more adequate than those obtained with dynamic methodologies. However, since static E results are scarce due to a lack of an established static methodology for mortars, mainly due to their lower mechanical resistance, friable behaviour and higher frailty when compared to concrete, engineers are led to use the established dynamic methodologies. This paper proposes an experimental methodology to determine the static E for moulded mortars specimens. The methodology was adapted from the standard procedure used for concrete specimens, to accommodate the specific characteristics of mortar specimens, namely: provide reliable displacement and applied load data; solve issue related to specific mechanical characteristics of mortar specimens, such as low strength and friable behaviour. This methodology was applied to standard moulded mortar specimens made from multiple mineral binders (cement, hydraulic lime and air lime). In order to validate it, the obtained results were compared with two, well-established, dynamic experimental methodologies (Resonance Frequency and Ultrasonic methodologies) as well as with reference values from relevant bibliography. Using the previous data, this paper also includes a preliminary analysis on the ratios between static and dynamic E values for the studied mortars, representing another objective of this study.
Year: 2020
Number Pages:
9p.
Author(s): Mera Marques, A.; Morais, J.; Gil de Morais, P.; Veiga, M. R.; Santos, C.; Candeias, P.; Ferreira, J.
: Construction and Building Materials
Editor: Elsevier
Volume:
Vol 232.
Keywords: Static modulus of elasticity; Deformability; Static and dynamic ratios; Dynamic modulus of elasticity; Mortars
Info
Optical Measurement of Planar Deformations in the Destructive Mechanical Testing of Masonry Specimens
This paper addresses the planar measurement problem in the destructive mechanical testing of masonry specimens, describing the proposed optical measurement solution. The adopted affine geometrical camera model is described as well as its experimental implementation using a digital camera and a measurement referential traceable to the International System of Units (SI). Experimental results from non-destructive tests are presented and discussed, including measurements obtained from the use of classical contact instrumentation. Measurement estimates and uncertainties related to the quantified mechanical properties are also shown.
Year: 2020
Author(s): Lages Martins, L.; Mera Marques, A.; Ribeiro, A.; Candeias, P.; Veiga, M. R.; Ferreira, J.
: applied sciences
Editor: MDPI
Volume:
Vol. 10, issue 1.
Keywords: Optical measurement; Deformation; Masonry specimens; Destructive testing
Info
Revestimentos armados como solução de reabilitação sísmica de paredes de alvenaria de edifícios antigos
As construções antigas fazem parte do tecido histórico das cidades, pelo que é importante proceder a intervenções de reabilitação eficientes, mas não destruidoras da sua identidade e valor cultural intrínseco. A utilização de rebocos armados apresenta-se como uma solução simples e eficaz no reforço sísmico deste tipo de construções, nos casos em que não é possível ou exigível a preservação dos revestimentos de paredes. Neste artigo, são analisadas várias composições de rebocos armados, constituídos por ligantes à base de cal aérea, cal hidráulica ou cimento, com um traço usual e com armaduras constituídas por redes metálicas, redes de fibra de vidro e uma rede de fibra natural. É analisada a capacidade resistente à tração dessesrevestimentos armados, assim como aspetos que podem influenciar a compatibilidade com os materiais existentes, apresentando-se as principais vantagens e desvantagens dos vários tipos de revestimentos.
Year: 2020
Number Pages:
25-36pp.
Author(s): Mera Marques, A.; Veiga, M. R.; Candeias, P.; Ferreira, J.
: Revista Portuguesa de Engenharia de Estruturas (rpee)
Editor: LNEC
Volume:
Série III, N.º 13.
Keywords: Edifícios antigos; Paredes de alvenaria; Reabilitação sísmica; Revestimentos armados
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Comunicação
Info
Avaliação da vulnerabilidade sísmica de edifícios de alvenaria.
A avaliação da vulnerabilidade sísmica dos edifícios
Year: 2012
Number Pages:
2p.
Author(s): Candeias, P.; Coelho, E.; Lourenço, P.; Campos Costa, A.
Editor: LNEC
Keywords: Reforço sísmico; Vulnerabilidade sísmica; Ensaios sísmicos; Edifícios
Info
Avaliação do desempenho de amortecedores de líquido sintonizado no comportamento de edifício.
Ao longo dos anos, os sistemas de controlo e proteção têm vindo a ser desenvolvidos, no sentido de resolver os problemas relacionados com os danos resultantes de ações dinâmicas. Estes sistemas permitem melhorar o comportamento dinâmico estrutural através da modificação das suas características dinâmicas ou influenciando a forma como as ações lhe são transmitidas. A forma como a ação dinâmica é modificada permite distinguir os vários tipos de sistemas de proteção dinâmica e em particular de proteção sísmica. Pretende-se apresentar a evolução através do tempo ao nível dos sistemas de proteção sísmica, bem como contextualizar o estado atual dos conhecimentos com particular incidência nos sistemas de proteção sísmica do tipo passivo e dentro destes dar mais ênfase aos amortecedores de líquido sintonizado (ALS) apresentando a descrição de alguns conceitos básicos associados ao seu funcionamento, vantagens, limitações de utilização, bem como alguns exemplos de aplicação prática a vários tipos de estruturas, nomeadamente edifícios.
Year: 2012
Number Pages:
2p.
Author(s): Falcão Silva, M. J.; Campos Costa, A.; Guerreiro, L.
Editor: LNEC
Keywords: Amortecedores de líquido sintonizado; Mitigação de vibrações; Simulações numéricas; Proteção sísmica
Info
Calibration of input parameters in volcanic areas and an enlarged dataset by stochastic finite-fault simulations
The calibration of the input parameters is the important task for stochastic finite-fault simulation in volcanic areas that we manage in the framework of the european project UPStrat-MaFa. The stochastic simulation method requires to know fault geometry, source, crust properties of the region and local site effect. We focused on the following pilot test areas: Mt Vesuvius, Campi Flegrei and Mt Etna , performing also two application for large magnitude event for Azores Islands and South Iceland. A general preliminary database of ground motion records has been collected in all test areas in order to set up the empirical laws of ground motion parameters. The results of the simulations are compared with observed waveforms and response spectra, to evaluate the suitability of the used parameters. The results show a good agreement between observed and simulated time histories and response spectra, encouraging further effort towards quantitative high resolution studies on input parameters.
Year: 2012
Author(s): Galluzzo, D.; Carvalho, A. M.; entidade LNEC
Keywords: Volcanic areas; Stochastic simulation
Info
Disaster prevention strategies based on an education information system.
Earthquake damage includes non-structural failure, failure of utility systems and, infrastructure, loss of functionand other non-structural damage. Occupants, building owners, insurance companies, building inspectors andothers, through their use of the buildings, systems and content, can affect the risk of such negative events. Thus,a prerequisite for more effective disaster risk reduction is increased risk awareness amongst people and in thecommunity and state development planning process, the educational curriculum, and media. As knowledge isclearly connected with understanding risks, the perception of natural hazards and risks in the local environmentshould be developed with the help of education. This paper presents a comparative study of the currenteducational curriculum on natural hazards within the school systems in four European countries: Italy, Portugal,Spain and Iceland. None of the countries provides courses dedicated to this topic but include it within othersubjects, most often in the natural sciences.
Year: 2012
Number Pages:
10p.
Author(s): Carvalho, A. M.; Raposo, S.; Sousa, M.; Bernhardsdóttir, A.E.
Editor: International Association for Earthquake Engineering
Keywords: Education information system; Risk awareness; UPStrat-MAFA
Info
Earthquake source parameters in the Azores region
The source spectra and physical properties of the propagation medium are studied from Azores seismographic data gathered over the past 20 years.
Year: 2012
Author(s): Carvalho, A. M.; Bezzeghoud . M; Borges. J; Caldeira, B.
Editor: ESC
Keywords: Fonte sísmica
Info
Estudos sismológicos para definição das acões sísmicas para o local de implantação do aproveitamento hidroeléctrico de Foz Tua
O aproveitamento hidroelétrico de Foz Tua situa-se no rio Tua e compreende uma barragem de betão do tipo abóbada. Os estudos sismológicos realizados visaram definir as ações sísmicas a considerar no projeto e nas verificações de segurança estrutural da barragem. Com este objetivo foram analisadas as diferentes abordagens para a caracterização da ação sísmica, bem como, em função dos métodos de avaliação adotados, os critérios utilizados para a definição dos cenários sísmicos correspondentes ao SBP (Sismo Base de Projeto) e ao SMP (Sismo Máximo de Projeto). A aplicação da metodologia proposta ao local do aproveitamento requereu a análise da informação geológica e sismológica disponível, com especial enfoque para as principais falhas regionais consideradas ativas e para os dados do catálogo sísmico relativos à região. Os movimentos sísmicos para os cenários SBP e SMP foram determinados com base em leis de atenuação segundo abordagens determinística e probabilística, e na metodologia estocástica que considera a geometria da falha, heterogeneidades de rotura e características do meio de propagação.
Year: 2012
Number Pages:
16pp.
Author(s): Jeremias, T.; Carvalho, A. M.; Campos Costa, A.
Editor: Sociedade portuguesa de Geotecnia
Keywords: Foz tua; Estudo sismológico
Info
Experimental dynamic analysis in earthquake engineering research
The Earthquake Engineering Research Centre (NESDE) is a LNEC division entirely devoted to the research of several topics of Earthquake Engineering. Research is being developed in LNEC during the lasts five decades addressing subjects from the seismic experimental and analytical modelling of structural systems to the matters of seismic hazard and risk analysis. A strong synergic scientific environment exists in LNEC revealed by the significant number of PhD theses presented in the past and under development at the present moment.
Year: 2012
Number Pages:
2p.
Author(s): Campos Costa, A.
Editor: Edições INEGI
Keywords: LNEC; Earthquake Engineering Research
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Relevância dos modelos de rotura de falha para uma análise de risco sísmico
Estuda-se a variação da ação sísmica face às características da rotura numa falha sísmica e o consequente efeito sobre os níveis de risco sísmico. Mostra-se a importância da consideração de modelos de rotura para a caracterização da ação sísmica e para uma análise de risco sísmico.
Year: 2012
Number Pages:
2pp.
Author(s): Carvalho, A. M.; Campos Costa, A.
Keywords: Risco sísmico; Modelos de rorura de falha; Acão sísmica
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Urban disaster-prevention strategies using macroseismic field and fault sources.
This contribution presents the general framework of the European project UPStrat-MAFA "Urban disasterPrevention Strategies using MAcroseismic Fields and FAult Sources" and its ongoing activities. A uniqueprobabilistic procedure is being used for seismic hazard evaluation, using both macroseismic fields andcharacteristics of fault sources for the analysis of data from volcanic and tectonic areas: Mt. Etna, Mt. Vesuviusand Campi Flegrei (Italy), Azores Islands (Portugal), South Iceland (Iceland), Alicante-Murcia (Spain), andmainland and offshore Portugal. An improvement of urban scale vulnerability information on building andnetwork systems (typologies, schools, strategic buildings, lifelines, and others) is proposed in the form of aglobal Disruption Index, with the objective to provide a systematic way of measuring earthquake impact inurbanized areas considered as complex networks. Disaster prevention strategies are considered based on aneducation information system, another effective component of the disaster risk reduction given by long-termactivities.
Year: 2012
Number Pages:
9p.
Author(s): Carvalho, A. M.; Raposo, S.; Zonno , G.; Sousa, M.
Editor: International Association for Earthquake Engineering
Keywords: Project UPStrat-MAFA; Urban disaster prevention strategies; Seismic risk; Probabilistic hazard
Info
UREDITEME project - building capacities through FP7 research networking
The paper refers to FP7 project for upgrading and renovation of research and personnel capacities of Institute ofEarthquake Engineering and Engineering Seismology, IZIIS, Skopje, Macedonia. Protection of structures againststrong seismic impact primarily depends on the quality of the applied standards for design and construction. Thereinforcement of the IZIIS
Year: 2012
Number Pages:
6pp.
Author(s): Bairrão, R.; Caldeira, L.; Coelho, E.
Keywords: Laminar box; Geo-models; Shaking table; Networking; Cooperation
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Books
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Historical earthquake-resistant timber framing in the mediterranean area
This book presents a selection of the best papers from the HEaRT 2015 conference, held in Lisbon, Portugal, which provided a valuable forum for engineers and architects, researchers and educators to exchange views and findings concerning the technological history, construction features and seismic behavior of historical timber-framed walls in the Mediterranean countries. The topics covered are wide ranging and include historical aspects and examples of the use of timber-framed construction systems in response to earthquakes, such as the gaiola system in Portugal and the Bourbon system in southern Italy; interpretation of the response of timber-framed walls to seismic actions based on calculations and experimental tests; assessment of the effectiveness of repair and strengthening techniques, e.g., using aramid fiber wires or sheets; and modelling analyses. In addition, on the basis of case studies, a methodology is presented that is applicable to diagnosis, strengthening and improvement of seismic performance and is compatible with modern theoretical principles and conservation criteria. It is hoped that, by contributing to the knowledge of this construction technique, the book will help to promote conservation of this important component of Europe
Year: 2016
Number Pages:
468p.
Author(s): Cruz, H.; Saporiti Machado, J.; Campos Costa, A.; Candeias, P.; Catarino, J. M.
Editor: Springer
Volume:
Vol. 1.
Keywords: Heart 2015 Conference; Historic Masonry; Performance-based Assessment; Structural Health Monitoring; Timber-Framed Construction Systems; Seismic-Resistant Timber Frames; Historical Constructive Analysis; Historical Timber-Framed Walls
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Assessment of the seismic capacity of stone masonry walls with block models
The applications of discrete elements models based on rigid block formulations to the analysis of masonry walls under horizontal out-of-plane loading is simplified block pattern are addressed. Two procedures for creating irregular block systems are presented, one using Voronoi polygons, the other based on a bed and cross joint structure with random deviations. A test problem provides a comparison of various regular and random block patterns, showing their influence on the failure loads. The estimation of manual frequencies of rigid block models, and its application to static pushover analyses, is addressed. An example of application of rigid block model to wall capacity problem is presented.
Year: 2011
Number Pages:
221-236pp.
Author(s): Lemos, J. V.; Campos Costa, A.; Bretas, E. M.
: Computational Methods in Earthquake Engineering
Editor: Springer
Volume:
Vol. 21.
Keywords: RTigid blocks; Discrete elements; Seismic assessment; Masonry structures
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Earthquake disaster scenario prediction and loss modelling for urban areas
The overall aim of Sub-Project 10 (Earthquake disaster scenario predictions and loss modelling for urban areas) has been to create a tool, based on state-of-the-art loss modelling software, to provide strong, quantified statements about the benefits of a range of possible mitigation actions, in order to support decision-making by urban authorities for seismic risk mitigation strategies. A further larger aim has been to contribute to a seismic risk mitigation policy for future implementation at European level. Among the European cities for which loss estimation studies have been carried out are Istanbul, Lisbon and Thessaloniki, and tools, using GIS mapping, have been developed by research teams in each of these cities; these were made available for further development to examine mitigation strategies within SP10. Related research studies
Year: 2007
Number Pages:
180p.
Author(s): Campos Costa, A.; Carvalho, A. M.
Editor: IUSS Press
Keywords: Shaking scenarios
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European manual for in-situ assessment of important existing structures. LessLoss Sub Project 5-In-situ assessment, monitoring and typification of buildings and infrastructure
Much work in Earthquake Engineering was devoted to the improvement of earthquake resistant design of new structures. One European result is EN 1998, which will be in several years the main seismic code for all European countries. But it is well known, that older existing structures cause in many large earthquakes much more casualties and damages than new structures. It is certainly not possible to retrofit all existing structures, but agreement exists, that assessment and retrofit of safety - critical - structures and lifeline structures must have priority. In September 2004 the European Integrated Research Project LESSLOSS on Risk Mitigation for Earthquakes and Landslides was started. The project will run for three years and comprises 13 Sub-Projects (SP´s). The consortium consists of 46 partners (see http:\\www.lessloss.org). LESSLOSS SP5 is on In-situ Assessment, Monitoring and Typification of buildings and Infrastructure. The project partners of SP5 are ARS, CESI, LNEC, RWTH and VCE. This Sub Project focuses mainly on the assessment of important existing structures and tries to integrate experimental methods into the assessment procedure. The progress of SP5 obtained in the first year is summarized in this paper. Highlights presented by all partners are mentioned and the assessment of Hospital Innsbruck is presented in more detail. The most innovative task of LESSLOSS/ SP5 is Update of vulnerability estimates via monitoring, which was also started in the first year.
Year: 2007
Number Pages:
195p.
Author(s): Campos Costa, A.; Candeias, P.; Mendes, L.; Flesch, R.; Pellegrini, R.; Friedl, H.; Hoffmeister, B.; Oppe, M.; Veit-Egerer, R.; Wenzel, H.; Eusebio, M.
Editor: IUSS Press
Keywords: Structures; Earthquake
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Modal analysis from ambient vibration survey of bridges: LNEC experience
In order to study the behavior of bridge structures in relation to traffic, wind and seismic loads, it is extremely important to know their actual dynamic properties (natural frequencies, vibration mode shapes and damping). The experimentally identified dynamic properties of bridge structures are also an effective way to characterize their actual global structural behavior. Whether included in the reception load tests of recently built bridges, before they are opened to the traffic, or as part of the inspection works of bridges already in service, LNEC has performed modal analysis studies based on the results of ambient vibration tests. Some of the studies carried out recently in important bridges are reported in this paper.
Year: 1999
Number Pages:
712-718pp.
Author(s): Rodrigues, J.; Campos Costa, A.
: Proceedings of the 17th International Modal Analysis Conference : February 8 - 11, 1999 / IMAC XVII.
Editor: SEM
Volume:
Vol. 3727.
Keywords: Dynamic properties; Bridge structures
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O Sismo de Northridge, Los Angeles, de 17 Janeiro de 1994. Ensinamentos para Portugal.
O sismo de Northridge ocorreu na parte norte da área metropolitana de Los Angeles, Califórnia, às 4:31 h do dia 17 de janeiro, uma segunda-feira coincidente com dia de feriado nacional, tendo atingindo uma magnitude de 6.6 na escala de Richter. O número total de vítimas mortais cifra-se em 57, havendo para cima de 8 000 feridos e 20 000 desalojados.As estimativas de perdas totais, feitas em meados de fevereiro de 1994, apontavam para valores de 15 biliões de US dólares, tendo o Estado da Califórnia apresentado um impacto económico total de ordem dos 30 biliões de dólares, perto do valor do Orçamento Geral do estado Português para 1994. Os prejuízos infligidos na indústria e no comércio são também surpreendentemente elevados, exigindo longos períodos de interrupção das atividades económicas.
Year: 1995
Number Pages:
165p.
Author(s): Oliveira, C.S.; Costa, A.; Campos Costa, A.; Azevedo, J.; Delgado, R.M.
Editor: IST e FEUP
Keywords: Northridge earthquake; Earthquake effects
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Capítulo de Livro
Info
Shaping favorable beliefs towards seismic protection through risk communication: A pilot-experience in two Lisbon schools (Portugal).
Communicating science within disaster risk reduction using methods that encourage two-way dialogue between scientists and laypersons is a challenging task. This paper aims at presenting a methodological strategy of communicating risk and non-structural seismic protection measures through participatory approach. Such methodological strategy is part of a pilot experience of risk communication in two schools in Lisbon (Portugal) under the EU project KnowRISK (Know your city, Reduce seISmic risK through non-structural elements). The efficacy of education for seismic safety is often inhibited by an incomplete understanding of the process by which individuals decide to protect themselves from harm (Becker JS, Paton D,Johnston DM, Ronan KR. Nat Hazards 64(1):107
Year: 2019
Number Pages:
445-458pp.
Author(s): Silva, D. S.; Vicente, M.; Pereira, A.; Candeias, P.; Ferreira, M.A.; Oliveira, C.S.; Bernardo, R.; Lopes, M.; Henriques, P.
: Proceedings of the International Conference on Earthquake Engineering and Structural Dynamics
Editor: Springer Link
Volume:
Volume 47.
Keywords: Non-structural; Protective behaviours; Risk communication; Seismic risk
Info
Characterization of timber masonry walls with dynamic tests
Most of the Lisbon 18th century timber-framed masonry
Year: 2018
Number Pages:
299-309pp.
Author(s): Gonçalves, A.; Candeias, P.; Guerreiro, L.; Ferreira, J.; Campos Costa, A.
: Historical earthquake-resistant timber framing in the mediterranean area
Editor: Springer
Volume:
Vol. 1.
Keywords: Shaking table tests; Timber-masonry walls;
Info
KnowRISK practical guide for mitigation of seismic risk due to non-structural components
Good performance of non-structural elements can be decisive in saving lives and costs when an earthquake strikes. The European project KnowRISK aims to educate and encourage households to take the necessary precautionary measures to protect people, houses, and contents. Preparedness and prevention act on community resilience. Within the KnowRISK project, the idea of a Practical Guide has been conceived suggesting seismic mitigation solutions for non-structural components to non-experts stakeholders. It is intended to guide people into the first steps of prevention in a straightforward manner, minimizing or avoiding injuries, damage, and long-term financial consequences. The novelty of the Guide belongs to his philosophy: a path through increasing challenges corresponds to a growing level of safety. The idea is that anyone can mitigate seismic risk in its own environment by adopting simple and low cost measures. The Practical Guide may contribute to increase risk awareness. This kind of initiatives if undertaken at larger scales may also enhance social resilience.
Year: 2018
Number Pages:
309-321pp.
Author(s): Ferreira, M.A.; Oliveira, C.S.; Lopes, M.; Musacchio, G; Candeias, P.; Vicente, M.; Silva, D. S.; O
: Proceedings of the International Conference on Earthquake Engineering and Structural Dynamics
Editor: Springer Link
Volume:
Volume 47.
Keywords: Practical guide; Community resilience; Preparedness; Non-structural elements
Info
Elastic and inelastic analyses of frames with a force-based higher-order 3D beam element accounting for axial-flexural-sheartorsional interaction
When one of the dimensions of a structural member is not clearly larger than the two orthogonal ones, engineers are usually compelled to simulate it with refined meshes of shell or solid finite elements that typically impose a large computational burden. The alternative use of classical beam theories, either based on Euler-Bernoulli or Timoshenko
Year: 2016
Number Pages:
109-128pp.
Author(s): Correia, A.A.; Almeida, J.P.; Pinho, R.
: Computational Methods in Applied Sciences
Editor: Springer
Volume:
Vol. 3.
Keywords: Inelastic response; Boundary conditions; Flexural-shear-torsional interaction; Higher-order; Force-based; Beam element
Info
A finite-fault modeling of the 1755 Lisbon earthquake sources
A non
Year: 2009
Number Pages:
433-454.
Author(s): Carvalho, A. M.; Campos Costa, A.; Sousa Oliveira, C.
Editor: L.A. Mendes-Victor et al. (eds)
Keywords: Earthquake scenarios; Finite-fault modeling
Info
Simulating earthquake scenarios in the european project Lessloss: the case of Lisbon
N/A
Year: 2009
Number Pages:
233-243.
Author(s): Zonno, G.; Carvalho, A. M.; Franceschina, G.; Akinci, A.; Campos Costa, A.; Coelho, E.; Cultrera, G.; Pacor, F.; Pessina, V.; Cocco, M.
Editor: L.A. Mendes-Victor et al. (eds)
Keywords: Earthquake scenarios
Info
Shaking table testing
This text reflects the first of the four lectures that the author has presented at Udine, Italy, at CISM
Year: 2008
Number Pages:
165-196pp.
Author(s): Bairrão, R.
Editor: Springer Verlag
Keywords: Shaking table testing
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Tese de Doutoramento
Info
Modelos estocáticos para a caracterização da acção sísmica em Portugal Continental
Um dos principais problemas e interesses da engenharia sísmica é a caracterizaçãoda acção sísmica, envolvendo a estimativa da intensidade, conteúdo em frequência,duração e variabilidade espacial dos movimentos intensos do solo mais gravosos, emtermos dos seus efeitos nas estruturas, que pode ocorrer num local.O presente trabalho de investigação desenvolve e aplica a metodologia estocástica etécnicas de modelação de fonte
Year: 2009
Author(s): Carvalho, A. M.
Keywords: Portugal continental; Risco sísmico; Fonte sísmica; Modelos estocásticos; Acção sísmica
Info
Risco sísmico em Portugal Continental
Os sismos são encarados frequentemente como desastres naturais inevitáveis. Todavia,deveriam ser considerados fenómenos naturais, cujos efeitos adversos podem ser minimizadoscaso se proceda a uma gestão efectiva do risco sísmico.O objectivo principal do presente trabalho de investigação é o de avaliar o risco sísmicoem Portugal Continental.Sendo um tema de natureza multidisciplinar, apresentam-se e discutem-se modelos deavaliação probabilística da perigosidade sísmica e sua desagregação, de vulnerabilidade efragilidade sísmicas de tipologias construtivas, de danos e de perdas económicas e humanas.Aplica-se a análise probabilística da perigosidade sísmica, e sua desagregação, aPortugal Continental, obtendo-se cenários modais capazes de reproduzir os níveis deperigosidade que os condicionam. Apresenta-se o inventário do parque habitacional e seushabitantes, descriminado por factores de vulnerabilidade, e classifica-se a sua vulnerabilidadesegundo os modelos de dano. Procede-se à actualização e aferição de uma metodologia parasimulação de cenários sísmicos, integrada num Sistema de Informação Geográfico. Avalia-seo risco sísmico, seguindo diversas abordagens, comparando-se os resultados com o risco deoutros países.Construiu-se assim uma ferramenta de avaliação de perdas devidas a sismos, queconstitui uma primeira contribuição para o desenvolvimento de um processo de gestão dorisco sísmico aplicado ao Continente Português.
Year: 2009
Author(s): Sousa, M. L.
Info
Avaliação da vulnerabilidade sísmica de edifícios de alvenaria
O parque habitacional de Portugal Continental contém algumas tipologias construtivas deelevada vulnerabilidade sísmica em relação às quais urge actuar no sentido de reduzir o riscosísmico a elas associado. No projecto de investigação
Year: 2008
Author(s): Candeias, P.
Keywords: Reforço sísmico; Vulnerabilidade sísmica; Ensaios sísmicos; Edifícios
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Relatório Científico
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Earthquake risk scenarios for selected European cities
O Laboratório Nacional de Engenharia Civil (LNEC) participa atualmente numa das sete Tarefas, doprojeto Europeu SHARE- Seismic Hazard Harmonization in Europe, mais precisamente na tarefa nº 2,intitulada Requisitos de engenharia e aplicações.O presente relatório de progresso descreve a participação do LNEC na sub-tarefa 2.5 - Cenários derisco sísmico para cidades Europeias selecionadas
Year: 2012
Number Pages:
44.
Author(s): Luísa Sousa, M.; Carvalho, A. M.
Editor: LNEC
Info
Actividade experimental na área dos sistemas passivos para a protecção sísmica de estruturas: Experiência do NESDE - Relatório de estágio
N/A
Year: 2011
Number Pages:
74pp.
Author(s): Falcão Silva, M. J.; Campos Costa, A.
Editor: LNEC
Info
Modelos de comportamento dinâmico aplicáveis a amortecedores de líquido sintonizado - Relatório de estágio
No presente relatório pretendem-se apresentar e definir alguns das linhasorientadoras para a simulação do comportamento dinâmico de fluidos no interior deAmortecedores de Líquido Sintonizado (TLDs), de acordo com o proposto na literatura.O problema da modelação do comportamento de fluidos no interior deAmortecedores de Líquido Sintonizado, à semelhança do que acontece parareservatórios, é complexo, sendo apresentados os principais modelos matemáticos emecânicos utilizados na actualidade.Assim serão descritos modelos de comportamento adoptados no casoparticular dos Amortecedores de Líquido Sintonizado (TLDs) e modelos simplificadosde sistemas de 1 (SDOF) ou mais graus (MDOF) de liberdade com com os referidosdispositivos de mitigação de acções dinâmicas acopladosO presente relatório servirá, à semelhança dos relatórios Sistemas passivos,activos, híbridos e semi-activos: Estado dos conhecimentos, Actividade experimentalna área dos sistemas passivos para a protecção sísmica de estruturas: Experiência doNESDE e Modelos de comportamento dinâmico para fluidos no interior dereservatórios como uma das linhas orientadoras para o desenvolvimento dos trabalhospropostos no âmbito do PIP 2009-2012 do NESDE-DE Protecção Sísmica deEstruturas: Reabilitação, reforço e sistemas inteligentes.
Year: 2011
Number Pages:
159pp.
Author(s): Falcão Silva, M. J.; Campos Costa, A.
Editor: LNEC
Info
Modelos de comportamento dinâmico para fluidos no interior de reservatórios - Relatório de estágio
N/A
Year: 2011
Number Pages:
176pp.
Author(s): Falcão Silva, M. J.; Campos Costa, A.
Editor: LNEC
Info
Sistemas passivos, activos, híbridos e semiactivos para a protecção sísmica de estruturas: Estado dos conhecimentos - Relatório de estágio
N/A
Year: 2011
Number Pages:
226pp.
Author(s): Falcão Silva, M. J.; Campos Costa, A.
Editor: LNEC
Info
Estabelecimento de cenários sísmicos para a região do Algarve com base em metodologias probabilísticas - Relatório de Estágio
N/A
Year: 2010
Number Pages:
89pp.
Author(s): RODRIGUES, I.; Sousa, M. L.
Info
NEFOREEE PROJECT
This Report corresponds to Task 2 of the NEFOREEE (New Fields of Research inEarthquake Engineering Experimentation) Project and comprises the description of theLNEC triaxial seismic platform and a presentation of the experimental programdeveloped in the scope of this Project.It is presented a description of the facility and the 3D seismic table with graphicalsupport, drawings of sizing and photographs, as well as its control system. The maininstrumentation available at the NESDE laboratory and used for this test is alsoincluded in this report.The model tested is described as well as the sequence of tests and the correspondingobtained results. Finally a brief analysis of the results is made.
Year: 2009
Number Pages:
325pp.
Author(s): Falcão Silva, M. J.; Campos Costa, A.; Bairrão, R.
Info
RELATÓRIO FINAL DO PROJECTO USUET
O presente relatório final do projecto USuET integra o trabalho já apresentado norelatório de progresso de Sousa & Afonso [2007], nomeadamente no que toca aoscapítulos 2, 3 e parte do capítulo 4 e, adicionalmente, descreve, em detalhe, asactividades desenvolvidas no projecto desde a data desse relatório (secção 4.2, ecapítulos 5 e 6). A parte da investigação conducente à actualização do Simulador deCenários Sísmicos para ambiente WebSIG, aplicado ao Arquipélago dos Açores, não seencontra descrita com o mesmo detalhe, neste relatório, pois enquadra-se na tese demestrado em Sistemas de Informação Geográfica de Afonso [2007], submetida àUniversidade Técnica de Lisboa. A versão definitiva desta tese, cuja discussão se prevêainda em 2008, será enviada oportunamente.
Year: 2008
Number Pages:
90pp.
Author(s): Sousa, M. L.; Afonso, N.
Keywords: Projecto usuet; Análise sistémica
Info
Cyclic tests of joints from a reinforced concrete precast building system
N/A
Year: 2007
Number Pages:
204pp.
Author(s): Mendes, L.; Coelho, E.; Campos Costa, A.
Info
Cyclic tests of joints from a reinforced concrete precast building system
This report describes the second phase activity of the Portuguese group in the Precast Structures EC8 research project. The Portuguese group is composed by Laboratório Nacional de Engenharia Civil (LNEC) and the Civibral, S.A. precast company. This phase follows the shaking table tests of a 2 stories structure of the same precast system, which is commercialized by Civibral. More information about these tests can be found in the repor.The goal of the work presented in this document is to assess the seismic behaviour of column-foundation and beam-column connections from the same precast system. To help achieve this goal, 4 column-foundation and 10 beam-column connections were tested using quasi-static, monotonic and cyclic tests, which were made imposing displacements to the specimens. The column-foundation connections (CFC) can be categorized as socket connections and the beam-column connections (BCC) as dry connections using only mechanical devices to transmit forces between elements. All the specimens were supplied and mounted by Civibral personal.
Year: 2007
Author(s): Mendes, L.; Coelho, E.; Campos Costa, A.
Keywords: Reinforced concrete; Cyclic tests
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Outro
Info
Sensibilidade climática, capacidade adaptativa e de vulnerabilidades atuais e futuras da AML
Análise dos registos históricos de eventos climáticos e o seu impacto no setor da energia da AML, para identificar o grau em que este setor foi afetado por estímulos relacionados com o clima. Avaliação de capacidades adaptativas.
Year: 2019
Author(s): Marques da Silva, F.; Pinto, A.; Machado, P.
Keywords: Energia; Alterações climáticas
Info
A propósito da forma na engenharia do vento
Análise da forma das edificações nas ações do vento
Year: 2018
Author(s): Marques da Silva, F.
Keywords: Engenharia do vento; Aerodinãmica
Info
Forma e desenho urbano - efeitos na ventilação
As condicionantes arquitetónicas e de urbanização na ventilação natural
Year: 2018
Author(s): Marques da Silva, F.
Keywords: Engenharia do vento; Ventilação
Info
Wind and structures
Caracterização do vento. Ações sobre estruturas. Ensaios em túnel de vento
Year: 2017
Author(s): Marques da Silva, F.
Keywords: Wind tunnel; Actions on structures; Wind engineering
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