Papers
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Force-based higher-order beam element with flexural-shear-torsional interaction in 3D frames. Part I: Theory
An innovative higher-order beam theory, capable of accurately taking into account flexural
Year: 2015
Number Pages:
204-217pp.
Author(s): Correia, A.A.; Almeida, J.P.; Pinho, R.
: Engineering Structures
Editor: Elsevier
Volume:
Vol.89.
Keywords: Timoshenko; Warping; Flexural
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Force-based higher-order beam element with flexural-shear-torsional interaction in 3D frames. Part II: Applications
The specific features of the proposed force-based formulation derived in the companion paper, which is applied for the first time to higher-order beam theories, are herein thoroughly validated. Introductory numerical examples illustrate the influence of mesh refinement, boundary conditions, and slenderness ratios for isotropic linear elastic response. Specific higher-order effects
Year: 2015
Number Pages:
218-235pp..
Author(s): Correia, A.A.; Almeida, J.P.; Pinho, R.
: Engineering Structures
Editor: Elsevier
Volume:
Vol. 89.
Keywords: Timoshenko; Warping; Flexural
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Measuring and estimating airflow in naturally ventilated double skin facades
An accurate assessment of the airflow in naturally ventilated double skin facades (DSF) is crucial for a correct design and performance evaluation. Measuring and predicting DSF airflow is not a straightforward task, given the stochastic nature of the wind, which can assist or oppose the buoyancy force. The present paper resumes the results of airflow measurements inside a naturally ventilated double skin facade using a tracer gas technique. The tests were performed on an outdoor air curtain (OAC) DSF test cell with a movable slat venetian blind. Measurements with no active shading and at night were also performed. Outdoor and test cell air gap temperatures were continuously measured and wind pressure coefficients were determined from wind tunnel tests. Experimental results were then compared to those obtained by a simple model taking into account both thermal and wind effects on the facade. From this comparison discharge coefficients were estimated, which can be used for characterizing the DSF behaviour.
Year: 2015
Number Pages:
292-301pp.
Author(s): Marques da Silva, F.; Gomes, M.; Rodrigues. A.
: Building and Environment
Editor: Elsevier
Volume:
87.
Keywords: Wind tunnel tests; Tracer gas; Test cell experiments; Natural ventilation; Double skin facades
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The role of source and site effects on structural failures due to Azores earthquakes.
The existing building stock in Azores islands (Portugal) was severely damaged during 1980and 1998 earthquakes. Structural failure was probably caused by a combination of factorsthat are not yet well understood. Earthquake source characteristics, site effects and structuralvulnerability may be some of those factors. However, it is very difficult to assess theinfluence of each factor on structural failure, mainly because recorded accelerograms usedin nonlinear structural analysis are influenced by both source characteristics and site conditions.The only way to overcome this problem is to control each factor individually whichcan be done by using simulated accelerograms. In our previous work, stochastic groundmotion simulations results were compared with earthquake records. Results seem to indicatethat simulated accelerograms can match recorded accelerograms if proper sourcecharacteristics and geological site conditions are selected. In this work, simulated accelerogramswere used for seismic nonlinear structural analysis. Simulations were carried outconsidering several 1980 Azores earthquake possible sources and for different geologicalsite conditions. Simulated accelerograms were then used to evaluate the structural nonlinearbehaviour of a reinforced concrete structure and of two masonry structures. The resultsof this work highlight the importance of site conditions and earthquake source characteristicsto the determination of the design seismic actions of Azores islands. This work wasperformed in the scope of
Year: 2015
Number Pages:
429-440pp.
Author(s): Carvalho, A. M.; Estêvão, J.M.C.
Editor: Elsevier
Volume:
vol.56.
Keywords: Site effects; Source effects; Earthquakes; Structural failures
Info
Duas décadas de cooperação europeia no âmbito da ID&I em engenharia sísmica no LNEC
O Laboratório Nacional de Engenharia Civil tem uma longa experiência na área da Engenharia Sísmica, sendo uma das instituições de referência, a nível europeu, em todos os campos desta área das Ciências da Engenharia. A investigação europeia em Engenharia Sísmica teve início no final da década de 50, tendo sido o LNEC, na pessoa do Engenheiro Júlio Ferry Borges, o seu principal impulsionador. Desde então, assistiu-se ao estudo dos diferentes aspetos da fenomenologia ligada à caraterização da ação sísmica e ao comportamento das estruturas sujeitas à ação dos sismos, como ilustrado pelas cerca de 50 teses de mestrado e doutoramento nos diferentes domínios da Engenharia Sísmica, desenvolvidas no Núcleo de Engenharia Sísmica e Dinâmica de Estruturas (NESDE), nas duas ultimas décadas, e por mais de uma centena de investigadores visitantes, nacionais e estrangeiros. No âmbito da avaliação do risco sísmico, o LNEC tem tido um papel fundamental a nível nacional, assumindo a liderança da investigação científica nas matérias relacionadas com a perigosidade sísmica, a caraterização da ação sísmica, a avaliação do risco, e o desenvolvimento de estratégias para redução da vulnerabilidade sísmica...
Year: 2014
Number Pages:
22-25pp.
Author(s): Campos Costa, A.; Coelho, E.; Carvalho, A. M.; Candeias, P.; Correia, A.A.
: Construção Magazine
Editor: Engenho e Média
Volume:
Nº 62.
Keywords: Engenharia sísmica
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Shaking table testing of an existing masonry building: assessment and improvement of the seismic performance
This paper aims to assess and improve the seismic performance of an existing masonry building withflexible floors, representative of a Portuguese building typology
Year: 2014
Number Pages:
247
Author(s): Campos Costa, A.; Lourenço, P.; Mendes, N.
: EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS
Editor: Wiley Online Library
Volume:
Vol. 43, Issue 2.
DOI:
10.1002/eqe.2342
Keywords: Strengthening; Shaking table; Seismic performance; Masonry; Earthquake
Info
Shaking table tests of a structure equipped with superelastic dampers
The energy dissipation capacity of the NiTi alloy was evaluated as part of a series of shake table tests. A superelastic damper was developed to take advantage of the hysteretic energy dissipation associated with this type of shape memory alloy. Each device was tested at different intensity levels. A vertical steel cantilever with 600 kg mass on top was subjected to a series of ground motions with different spectral characteristics. The dampers were placed as part of a tie system, restraining the horizontal movement of the top mass. The devices showed stable hysteretic behavior allowing for energy dissipation.
Year: 2014
Number Pages:
674-695pp.
Author(s): Campos Costa, A.; Candeias, P.; Guerreiro, L.; Branco, M.
: Journal of Earthquake Engineering
Editor: Taylor & Francis
Volume:
Vol. 18, Issue 5.
Keywords: Energy dissipation; Shake table test; Shape memory alloy; Superelastic damper
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The role of non-linear dynamic soil-foundation interaction on the seismic response of structures
In this paper we provide an overview of recent research work that contributes to clarify the effects of non-linear dynamic interaction on the seismic response of soil foundation-superstructure systems. Such work includes experimental results of seismically loaded structures on shallow foundations, theoretical advancements based on improved macro-elementmodeling of the soil-foundation system, examples of seismic design of bridge piers considering non-linear soil-foundation interaction effects, and numerical results of incremental non-linear dynamic analyses. The objective of this paper is to support the concept of a controlled share of ductility demand between the superstructure and the foundation as a key ingredient for a rational and integrated approach to seismic design of foundations and structures.
Year: 2014
Number Pages:
1157-1176pp..
Author(s): Correia, A.A.; Pecker, A.; Paolucci, R.; Chatzigogos, C.; Figini, R.
: Bulletin of Earthquake Engineering
Editor: Springer
Volume:
Vol. 12, Issue 3.
Keywords: Incremental dynamic analysis; Displacement-based seismic design; Non-linear macro-element; Experimental testing; Seismic foundation response; Non-linear dynamic soil-structure interaction
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Tuned liquid dampers simulation for earthquake response control of buildings
This paper is focused on the study of an earthquake protection system, the tuned liquid damper (TLD), which can, if adequately designed, reduce earthquake demands on buildings. This positive effect is accomplished taking into account the oscillation of the free surface of a fluid inside a tank (sloshing). The behaviour of an isolated TLD, subjected to a sinusoidal excitation at its base, with different displacement amplitudes, was studied by finite element analysis. The efficiency of the TLD in improving the seismic response of an existing building, representative of modern architecture buildings in southern European countries was also evaluated based on linear dynamic analyses.
Year: 2014
Number Pages:
1007
Author(s): Falcão Silva, M. J.; Lourenço, P.; Varum, H.; Campos Costa, A.; Teixeira-Dias, F.; Guerreiro, L.
: Bulletin of Earthquake Engineering
Editor: Springer
Volume:
Vol. 12, Issue 2.
Keywords: Energy dissipation; Sloshing; Earthquake protection systems; Tuned liquid damper
Info
A segurança sísmica na reabilitação de edifícios
N/A
Year: 2013
Number Pages:
52pp.
Author(s): Coelho, E.; Bairrão, R.
: Tecnica Revista Engenharia
Editor: Associação dos Estudantes do Instituto Superior Técnico
Volume:
Nº 01.
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Comunicação
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Vulnerability evaluation of residential buildings in Portugal
With the aim of evaluating the seismic vulnerability of residential buildings in Portugal, the classification of the Portuguese housing stock was possible on the basis of a National database published in 1991. The study herein reported, included in a National Project concerning the seismic risk mitigation in Portugal, deals with the analysis of the database that resulted in the establishment of the most current building types in seismic prone regions with higher urban concentrations. The paper presents a summary of the analysis of the statistics of the stock and its geographic distribution, and includes the classification of residential buildings into typological classes, which vulnerability is characterised through a HAZUS99-based methodology.
Year: 2002
Number Pages:
10p.
Author(s): Cansado Carvalho, E.; Coelho, E.; Campos Costa, A.; Luísa Sousa, M.; Candeias, P.
Editor: Elsevier
Keywords: Seismic risk mitigation; Evaluation of existing buildings; Seismic vulnerability
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Caracterização dinâmica e análise sísmica da Igreja do Mosteiro da Serra do Pilar
Nesta comunicação descreve-se o trabalho desenvolvido no estudo do comportamento sísmico da Igreja do Mosteiro da Serra do Pilar. A partir da modelação numérica tridimensional da igreja e da quantificação de parâmetros mecânicos e dinâmicos da estrutura, a análise sísmica foi realizada em duas fases de cálculo. Procedeu-se a um primeiro cálculo linear global da estrutura, seguido de um segundo cálculo da subestrutura dos arcos e colunas de apoio onde foi ativado o comportamento não-linear das juntas entre blocos e analisado o efeito resultante da aplicação de intensidades sísmicas crescentes.
Year: 2001
Number Pages:
277-290pp.
Author(s): Almeida, C.; Arêde, A.; Costa, A.; Campos Costa, A.; Rodrigues, J.
Editor: LREC
Keywords: Análise sísmica; Ensaios dinâmicos; Património; Modelação
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Casualidade sísmica do grupo central do Arquipélago dos Açores
No presente trabalho apresenta-se uma primeira reavaliação da casualidade sísmica das ilhas do Grupo Central do Arquipélago dos Açores, com o objetivo de se estabelecer um zonamento atualizado e mais detalhado para o Arquipélago.Este estudo foi efetuado com base na compilação de catálogos sísmicos históricos e instrumentais da região dos Açores, e num modelo de 9 grandes zonas de geração, utilizando duas metodologias: (i) a clássica e (ii) uma baseada na distribuição espacial da sismicidade. A geologia superficial das diferentes zonas urbanas foi classificada em três categorias (solo duro, solo intermédio e solo brando), de forma a ser contemplada nas leis de atenuação espectral publicadas na literatura.Comparam-se as duas metodologias e apresentam-se curvas de casualidade sísmica para as sedes de concelho das ilhas do Grupo Central e mapas de casualidade sísmica para um período de exposição de 50 anos e uma probabilidade de excedência de 10%.
Year: 2001
Number Pages:
171-184pp.
Author(s): Carvalho, A. M.; Luísa Sousa, M.; Oliveira, C.S.; Nunes, J. C.; Campos Costa, A.; Forjaz, V.H.
Editor: LREC
Keywords: Grupo central; Geologia superficial; Casualidade sísmica; Açores
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Classificação tipológica do parque habitacional de Portugal Continental para o estudo da sua vulnerabilidade sísmica
Com o objetivo de estudar a vulnerabilidade sísmica do parque habitacional de Portugal Continental, foi efetuado o seu levantamento com base no III Recenseamento Geral da Habitação e no XIII Recenseamento Geral da População levados a cabo pelo Instituto Nacional de Estatística em 1991. A análise do inventário de existências permitiu estabelecer a tipificação do parque habitacional português e classificar as tipologias construtivas mais correntes nas zonas de maior sismicidade e maior concentração urbana. Este estudo está incluído no âmbito do projeto
Year: 2001
Number Pages:
199-212pp.
Author(s): Cansado Carvalho, E.; Coelho, E.; Campos Costa, A.; Luísa Sousa, M.; Candeias, P.
Editor: LREC
Keywords: Mitigação do risco sísmico; Edifícios existentes; Tipologias construtivas; Vulnerabilidade sísmica
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Metodologias para a avaliação de perdas humanas em consequência de sismos
Um dos objetivos do projeto
Year: 2001
Number Pages:
157-170pp.
Author(s): Campos Costa, A.; Luísa Sousa, M.; Martins, A.; Castro, S.
Editor: LREC
Keywords: Risco sísmico; Perdas humanas; Sismo de 80 da Terceira; Metodologias
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Seismic hazard de-aggregation for the Central group of Azores Islands
Large seismic source zones and the modelling of epicentral location by the uniform probability distribution are two options that contribute to smoothed results in probabilistic seismic hazard studies. In order to obtain less smoothed results that reflect the geographical underlying seismic activity it was adopted an empirical distribution, based on the seismic catalogue, to model the random variable epicentral distance. This option avoid the outline of seismic sources in regions where seismogenic structures are poorly known and are the first step to estimate hazard de-aggregation at a site. The methodology was applied de-aggregating seismic hazard for all counties of the Central Group of Azores Archipelago. The relative contribution to the hazard of mean and modal values of magnitude and distance is tabulated for those counties aiming to identify the dominating events to the site. A de-aggregation plot for the county with the severest hazard is also presented, for different spectral periods.
Year: 2001
Number Pages:
241-250pp.
Author(s): Luísa Sousa, M.; Carvalho, A. M.; Campos Costa, A.
Editor: LREC
Keywords: Response spectra; Seismic hazard; Probabilistic seismic scenario; De-aggregation; Azores
Info
Assessment of experimental seismic response through damage evaluation
The paper presents a contribution for the assessment of experimental results obtained in seismic tests of structures in a context of fragility analysis for earthquake risk assessment. A methodology is proposed to estimate the vulnerability of specimens tested for increasing excitations, compensating for the damage accumulation in one same specimen (as opposed to the very expensive alternative of testing virgin specimens for each level of excitation). The method provides the damage evolution in relation to a
Year: 2000
Number Pages:
8p.
Author(s): Coelho, E.; Campos Costa, A.; Cansado Carvalho, E.
Editor: New Zeland Society for Earthquake Engineering
Keywords: Vulnerability; Seismic tests of structures
Info
Comportamento sísmico experimental de estruturas de betão armado reforçadas com dispositivos dissipadores
Apresenta-se um programa experimental realizado na plataforma sísmica do LNEC, em colaboração com a Universidade de Basilicata, no âmbito do projeto Europeu ECOEST II, cujo objetivo foi a aplicação de técnicas de controlo passivo, baseadas em sistemas de contraventamento com dissipadores, na reabilitação sísmica de estruturas existentes de betão armado.
Year: 2000
Number Pages:
649-658pp.
Author(s): Coelho, E.; Campos Costa, A.; Cansado Carvalho, E.; Ponzo, F.C.; Dolce, M.
Editor: LNEC
Keywords: Dissipadores de energia; Estruturas de betão armado reforçadas
Info
Definition of seismic action in the context of EC-8. Topics for discussion
The present paper summarises a few problems encountered with the application of the Eurocode 8 (EC-8), Parts 1-1 dealing with the definition of seismic action and zonation when preparing the National Document Application (NDA) in each European country. Points related to the representation of seismic action, the setting of return periods, the definition of spectral shapes and the possibility of use of more than one seismic scenario are among the most important topics presented. The Portuguese code, in action since 1983 [9], needs to be revised in what concerns seismic action in order to include recent studies on seismicity, seismic hazard and modelling of strong motion data. This revision, opportunely assessed in the context of the EC-8, brings up several of the topics above referred and shows the proposed solutions.
Year: 2000
Number Pages:
8p.
Author(s): Oliveira, C.S.; Campos Costa, A.; Luísa Sousa, M.
Editor: New Zeland Society for Earthquake Engineering
Keywords: Eurocode 8 (EC-8)
Info
Seismic risk mitigation in Portugal.
A project entitled
Year: 2000
Number Pages:
6p.
Author(s): Cansado Carvalho, E.; Coelho, E.; Campos Costa, A.; Luísa Sousa, M.; Candeias, P.; Massena, B.; Castro, S.
Editor: ELSA
Keywords: Vulnerability; Seismic risk; Seismic hazard; Design rules; Retrofitting; Portugal; Mitigation
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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
Info
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
Info
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
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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
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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
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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
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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
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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.
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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
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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
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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
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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
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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
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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.
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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.
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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
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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.
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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
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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
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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
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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
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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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