Papers
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Análise não linear de um conjunto de edifícios em placa no bairro de Alvalade: avaliação preliminar de estabilidade e previsão dos mecanismos de colapso
Os edifícios tipo
Year: 2019
Number Pages:
97-106pp.
Author(s): Bernardo, V.; Candeias, P.; Campos Costa, A.; Costa, A.
: Revista Portuguesa de Engenharia de Estruturas (rpee)
Editor: LNEC
Volume:
Série III, N.º 11.
Keywords: Modos de colapso; Análise preliminar de estabilidade; Applied Element Method; Ensaios de caraterização dinâmica; Edifícios tipo
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Paredes resistentes de alvenaria de tijolo reforçadas com revestimentos armados
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. No contexto do reforço sísmico, a utilização de rebocos armados apresenta-se como uma solução simples e pouco intrusiva. Os rebocos armados em paredes conferem um aumento da resistência e da ductilidade ao corte (no plano) e da ductilidade à flexão (fora do plano), um aumento da resistência superficial e permitem ainda um melhor controlo da fendilhação.Neste artigo será apresentada a caracterização experimental dos materiais constituintes das alvenarias (argamassas de assentamento, argamassas de revestimento e tijolos), e os resultados obtidos em ensaios de compressão diagonal de pequenos provetes de alvenaria, com e sem a aplicação de rebocos armados.
Year: 2019
Number Pages:
05-18pp.
Author(s): Mera Marques, A.; Candeias, P.; Ferreira, J.; Santos Silva, A.; Veiga, M. R.
: Revista Portuguesa de Engenharia de Estruturas (rpee)
Editor: LNEC
Volume:
Série III, N.º 10.
Keywords: Rebocos armados; Ensaios de compressão diagonal; Paredes resistentes de alvenaria
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Two-way bending out-of-plane collapse of a full-scale URM building tested on a shake table
This paper describes a shake table test on a one-storey full-scale unreinforced masonry structure, which complements an earlier testing of a two-storey structure with similar characteristics. The building specimen was meant to represent the upper floors of the end-unit of a terraced house, built with cavity walls and without any particular seismic design or detailing. In these specimens, the masonry walls were composed of two leaves: a load-bearing inner one made of calcium silicate bricks sustaining a reinforced concrete floor and an external leaf made of clay-bricks connected to the inner leaf by means of metallic ties. A pitched timber roof was supported by two triangular gable walls. Floor acceleration response histories of the previously tested two-storey specimen were used as input motions. An incremental dynamic test, with vertical and horizontal inputs, was carried out up to the explicit collapse of some bearing elements of the structure. In particular, a two-way bending out-of-plane collapse of a load-bearing wall was observed and described.
Year: 2019
Number Pages:
2165
Author(s): Correia, A.A.; Candeias, P.; Campos Costa, A.; Tomassetti, U.; Graziotti, F.
: Bulletin of Earthquake Engineering
Editor: Springer
Volume:
Vol.17.
Keywords: Vertical acceleration; Non-structural components; Timber roof; Collapse; Out-of-plane; Shake table
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Wind tunnel and CFD analysis of wind-induced natural ventilation in sheds roof building: impact of alignment and distance between sheds
Sheds roof is a natural ventilation strategy that presents roof openings working as air collectors or extractors. A detailed review of the literature indicates a lack of research analyzing the impact of different sheds roof shapes and roof configurations on natural ventilation potential. his paper aims to evaluate the impact of changes in distance and alignment between wind catcher and leeward sheds roof. The methodology was Computational Fluid Dynamics (FCD) simulation. tests were performed in a atmospheric boundary layer wind tunnel on a 1:15 scale model to evaluate the accuracy of CFD simulations in different design configurations of sheds roof. The analysis showed that CFD simulations are generaly in good agreement with the wind tunnel tests. The difference between the most o the monitored points in the two tools used had errors below 10%. besides this, the results show that changes in alignment of the sheds and increasing distance between them decrease and increase the internal airflow to the leeward and windward sheds of the roof, respectively. In the first case it is due to the reduction in the sheds openings area. In the second these changes turn the sheds more effective in the air capture.
Year: 2019
Number Pages:
22p.
Author(s): Lukiantchuki, M.; Shimomura, A.; Marques da Silva, F.; Caram, R.
: International Journal of Ventilation
Editor: Taylor & Francis
Keywords: wind tunnel; CFD; Sheds roof; Natural Ventilation
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Análise da segurança de pontes sujeitas a ações dinâmicas durante a reabilitação dos pilares
Apresenta-se neste artigo um estudo de análise da segurança das pontes Criz II e de São João de Areias, na albufeira da barragem da Aguieira, em Portugal, durante a execução de novas fundações, no âmbito das empreitadas de reabilitação, na proximidade dos pilares afetados por reações expansivas do betão no seu embasamento. A ação dinâmica induzida pela perfuração de maciços rochosos foi modelada como uma ação periódica composta por um momento torsor aplicado na fundação de cada pilar isolado combinado com três forças ortogonais representando a força imposta pela caroteadora e os desequilíbrios das tensões de corte por rotação.Através da análise dinâmica linear das estruturas completas e de análises não lineares estáticas e dinâmicas dos pilares, foram estabelecidas as condicionantes às vibrações induzidas pelas máquinas caroteadoras, nomeadamente em termos de limites máximos da resposta em velocidade no topo dos embasamentos, edefinidas as condições de monitorização da estrutura durante a obra. Estas especificações foram elaboradas em estreita colaboração com técnicos da Infraestruturas de Portugal, I.P., e incluídas nas Cláusulas Técnicas Especiais para o lançamento da empreitada.
Year: 2018
Number Pages:
05-18pp.
Author(s): Campos Costa, A.; Candeias, P.; Lemos, J. V.; Catarino, J. M.
: Revista Portuguesa de Engenharia de Estruturas (rpee)
Editor: LNEC
Volume:
Série III, N.º 8.
Keywords: Limites de vibração em embasamentos; Vibrações induzidas por caroteadoras; Análise de segurança de pontes
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Assessment of the combined in
Understanding the out
Year: 2018
Number Pages:
2821-2839pp.
Author(s): Correia, A.A.; Lourenço, P.; Onat, O.; Koçak, A.
: Earthquake Engineering and Structural Dynamics
Editor: Wiley
Volume:
47.
Keywords: Shake table experiment; Reinforced concrete; Out
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Characterization of reinforced timber masonry walls in
After the large destruction of Lisbon due to the 1755 earthquake, the city had to be completely rebuilt. The innovative
Year: 2018
Number Pages:
93-106 pp.
Author(s): Gonçalves, A.; Guerreiro, L.; Candeias, P.; Ferreira, J.; Campos Costa, A.
: Engineering Structures
Editor: Elsevier
Volume:
V. 166.
Keywords: Pombalino buildings; Seismic behavior; Dynamic tests; Timber masonry walls
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Characterization of reinforced timber masonry walls in
After the large destruction of Lisbon due to the 1755 earthquake, the city had to be completely rebuilt. The innovative
Year: 2018
Number Pages:
93-106pp.
Author(s): Gonçalves, A.; Guerreiro, L.; Candeias, P.; Ferreira, J.; Campos Costa, A.
: Engineering Structures
Editor: Elsevier
Volume:
Volume 166.
Keywords: Timber masonry walls;
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Characterization of timber masonry walls with dynamic tests
Timber-framed wall buildings are seen all over Europe, especially in seismic regions, given its adequacy to resist earthquakes. The
Year: 2018
Number Pages:
16p.
Author(s): Gonçalves, A.; Candeias, P.; Guerreiro, L.; Ferreira, J.; Campos Costa, A.
: International Journal of Architectural Heritage - Conservation, Analysis, and Restoration
Editor: Taylor&Francis
Volume:
Volume 12, 2018.
Keywords: Timber masonry walls; Shaking table; Resist earthquakes; Rehabilitation; Dynamic tests
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Characterization of timber masonry walls with dynamic tests
Timber-framed wall buildings are seen all over Europe, especially in seismic regions, given its adequacy to resist earthquakes. The
Year: 2018
Number Pages:
298-313pp.
Author(s): Gonçalves, A.; Candeias, P.; Ferreira, J.; Campos Costa, A.; Guerreiro, L.
: International Journal of Architectural Heritage
Editor: Taylor & Francis
Volume:
Vol.13.
Keywords: Timber masonry walls; Shaking table; Resist earthquakes; Dynamic tests; Rehabilitation
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Comunicação
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Ensaio aerodinâmico de uma ponte pedonal suspensa
O trabalho apresentado refere-se à avaliação do comportamento aerodinâmico da ponte pedonal suspensa 516 Arouca. Para tal realizaram-se ensaios em túnel de vento sobre um modelo reduzido de modo a obter os seus coeficientes aerodinâmicos estáticos e a resposta dinâmica.Os ensaios estáticos contemplaram diferentes configurações: i) tabuleiro; ii) tabuleiro e catenárias; iii) tabuleiro com pessoas, e; iv) tabuleiro e pórticos de suporte aos cabos de estabilização. Para os ensaios dinâmicos foi ensaiado apenas o tabuleiro.Para estes últimos ensaios, dado que o principal modo de deslocamento é lateral (em baloiço), houve que implementar um esquema de suspensão apropriado.
Year: 2021
Number Pages:
15.
Author(s): Marques da Silva, F.
Editor: Associação Portugusa de Análise Experimental de Tensões
Keywords: Túnel de vento; Aerodinâmica; : Pontes suspensas
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Análise não linear de um conjunto de edifícios em placa no bairro de alvalade: avaliação preliminar de estabilidade e previsão dos mecanismos de colapso
Os edifícios tipo
Year: 2019
Number Pages:
12p.
Author(s): Bernardo, V.; Candeias, P.; Campos Costa, A.; Costa, A.
Editor: Comissão Organizadora
Keywords: Modos de colapso; Análise preliminar de estabilidade; Applied Element Method; Ensaios de caraterização dinâmica; Edifícios tipo
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Comportamento de paredes de alvenaria sujeitas a ações no plano: análise numérica e validação experimental
As estruturas de alvenaria têm nos demonstrado ao longo dos anos grande suscetibilidade perante a ação dos sismos. Para que possam ser definidas e implementadas estratégias de mitigação é importante compreender a vulnerabilidade destas estruturas.O presente estudo pretende analisar o comportamento de duas paredes de alvenaria, com e sem reforço, sujeitas a ações cíclicas no seu plano e sob carregamento vertical. Como proposta de reforço e melhoria do comportamento da parede foi utilizada rede de fibra de vidro e argamassa à base de cal. Numa primeira fase será utilizado um programa de cálculo avançado para análises não lineares, baseado na formulação do Applied Element Method (AEM) [1], de forma a prever o comportamento das paredes até ao colapso. Os resultados serão comparados e discutidos sendo feita a validação experimental do modelo numérico e da formulação utilizada.
Year: 2019
Number Pages:
12p.
Author(s): Bernardo, V.; Mera Marques, A.; Candeias, P.; Campos Costa, A.; Ferreira, J.
Editor: Comissão Organizadora
Keywords: Validação experimental; Previsão numérica; Applied Element Method; Paredes de alvenaria
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Experimental response of non-seismically designed URM buildings subjected to induced seismicity
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: 2019
Number Pages:
12p.
Author(s): Correia, A.A.; Mera Marques, A.; Campos Costa, A.; Candeias, P.; Bernardo, V.; Tomassetti, U.; Graziotti, F.; Kallioras, S.
Editor: Comissão Organizadora
Keywords: Collapse; Limit states; Induced seismicity; Full-scale shake table test; Unreinforced masonry building
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Fiabilidade estrutural de edifícios existentes de betão armado sem dimensionamento sismorresistente
Até à introdução e disseminação do atual regulamento de dimensionamento sismorresistente em 1983, o Regulamento de Segurança e Acções para Estruturas de Edifícios e Pontes (RSA), a generalidade dos edifícios de betão armado eram dimensionados para resistir apenas a cargas gravíticas. O presente estudo pretende caracterizar o comportamento sísmico destes edifícios bem como quantificar a fiabilidade estrutural quando avaliados à luz do Eurocódigo 8 - Parte 3.Por forma a criar um contexto representativo desta classe de edifícios, foram gerados centenas de modelos numéricos que refletem as principais características geométricas e mecânicas dos materiais, e que obedecem às regras e disposições construtivas definidas nos regulamentos nacionais anteriores à introdução do RSA. A análise probabilística dos resultados obtidos para os níveis de perigosidade associados às diferentes regiões doterritório nacional fornece indicações de quais as combinações edifícios/zonas sísmicas que apresentam uma maior vulnerabilidade face à ação sísmica.
Year: 2019
Number Pages:
12p.
Author(s): Sousa, R.; Campos Costa, A.; Candeias, P.; Costa, A.
Editor: Comissão Organizadora
Keywords: Betão armado; Edifícios existentes; Comportamento sísmico; Fiabilidade estrutural
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Proposta de uma metodologia para a avaliação expedita de edifícios de existentes de betão armado
A avaliação da segurança sísmica de edifícios existentes tem como quadro de referência a NP EN 1998-3; 2017. A complexidade destes procedimentos, aliada ao reconhecimento de que uma parte significativa do território nacional apresenta uma sismicidade média/baixa, torna a aplicação desta norma complexa para a maioria dos edifícios existentes de pequeno a médio porte.Neste contexto, foi desenvolvido um estudo probabilístico com o objetivo de definir dois procedimentos alternativos que, não pretendendo substituir a regulamentação existente, permitem avaliar a segurança sísmica de edifícios de uma forma expedita, com base nas propriedades geométricas e mecânicas dos seus elementos verticais.Não obstante a sua simplicidade, estes métodos permitem assegurar o mesmo nível de fiabilidade estrutural para os diferentes graus de perigosidade sísmica em Portugal, bem como um nível de segurança inversamente proporcional ao nível de complexidade dos mesmos, tendo como referência a NP EN 1998-3; 2017.
Year: 2019
Number Pages:
12p.
Author(s): Sousa, R.; Campos Costa, A.; Candeias, P.; Costa, A.
Editor: Comissão Organizadora
Keywords: Betão armado; Edifícios existentes; Avaliação segurança sísmica
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Collapse shake-table test on a URM-timber roof substructure
Typical low-rise masonry construction in regions such as Europe, Australia and New Zealand consists of cavity or solid URM walls covered with various timber roof configurations generally supported by masonry gables. The flexibility of these light timber roof systems has been reported to have significant effect on the seismic performance of the structure as a whole. Post-earthquake observations and experimental outcomes highlighted the large vulnerability of the URM gable walls to the development of overturning mechanisms, both due to the out-of-plane excitations and the in-plane timber diaphragm deformability. This paper presents a full-scale collapse shake-table test on a Dutch roof substructure composed by wooden planks supported by timber beams lying on masonry gable walls. After attaining the collapse of the gable walls, the timber roof diaphragm was subjected to a supplementary quasi-static cyclic pushover test for a complete characterization of the system response. The test is a part of a wider research project aimed at assessing the vulnerability of URM buildings in Groningen, a region of the Netherlands not naturally prone to seismic events, but which has recently been exposed to induced seismicity. The presented results include the damage evolution, the collapse mechanism and the hysteretic response of the specimen.
Year: 2018
Number Pages:
12p.
Author(s): Correia, A.A.; Tomassetti, U.; Campos Costa, A.; Penna, A.; Graziotti, F.; Magenes, G.
Editor: EAEE/ETAM
Keywords: Collapse; Roof; Timber; Unreinforced masonry; Full-scale shake-table test
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Full-scale shake-table tests of URM buildings subjected to induced ground motions
This paper discusses the results of three dynamic shake-table tests, performed on full-scale unreinforced masonry buildings without specific seismic detailing. The testing program is part of a wider research project aimed at assessing the seismic vulnerability of buildings typical of the Groningen region, located in Northeast of the Netherlands. This area, historically not prone to tectonic ground motions, in the recent years has been subjected to earthquakes induced by reservoir depletion due to gas extraction. The first building specimen simulated the end-unit of a two-story terraced house, built with unreinforced cavity walls. These walls were composed of an inner load-bearing leaf, made of calcium silicate bricks supporting the floors, and an outer veneer, made of clay bricks with aesthetic and weather-protection function. The two leafs were interconnected by distributed metal ties. The floors consisted of reinforced concrete slabs, providing rigid diaphragms in their plane. The pitched roof was made of longitudinal timber purlins, supported by end gables perpendicular to the shaking direction, and wood boards. The second specimen was a replica of the second story and the attic of the first building, with identical details for walls, slab, and roof framing tested to study the collapse mechanism. The third specimen represented instead a one-story detached pre-1940s house, built with double-wythe unreinforced clay masonry walls. The prototype structure was designed to include large openings and a re-entrant corner, causing significant horizontal irregularities. The first floor was made of timber beams and planks, resulting in a flexible diaphragm. The steep-pitch roof consisted of a series of timber trusses connected by wood purlins and boards. The two façades perpendicular to the shaking direction were designed in order to represent two common gable geometries.
Year: 2018
Number Pages:
12p.
Author(s): Graziotti, F.; Tomassetti, U.; Correia, A.A.; Penna, A.; Magenes, G.; Guerrini, G.
Editor: EAEE/ETAM
Keywords: Induced Seismicity; Collapse; Roof; Unreinforced masonry building; Full-scale shake-table test
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Towards a uniform earthquake risk model for Europe
Seismic risk has been the focus of a number of European projects in recent years, but there has never been a concerted effort amongst the research community to produce a uniform European risk model. The H2020 SERA project has a work package that is dedicated to that objective, with the aim being to produce an exposure model, a set of fragility/vulnerability functions, and socio-economic indicators in order to assess probabilistic seismic risk at a European scale. The partners of the project are working together with the wider seismic risk community through web tools, questionnaires, workshops, and meetings. All of the products of the project will be openly shared with the community on both the OpenQuake platform of the Global Earthquake Model (GEM) and the web platform of the European Facilities for Earthquake Hazard and Risk (EFEHR).
Year: 2018
Number Pages:
10p.
Author(s): Romão, X.; Correia, A.A.; Crowley, H.; Rodrigues, D.; Silva, V.; Despotaki, V.; Castro, J.M.; Akkar, S.; Hancilar, U.; Pitilakis, K.; Pitilakis, D.; Belvaux, M.; Wiemer, S.; Danciu, L.; Bursi, O.S.; W
Editor: EAEE/ETAM
Keywords: European risk; Socio-economic vulnerability; Fragility model; Exposure model; Seismic risk
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A fibre-based frame element with explicit consideration of bond-slip effects
Reinforced concrete (RC) frames subjected to seismic loading often depict localized member-end deformations due to strain penetration effects between adjacent members, such as beam-column and column-footing joints. Past experimental programs indicate that the bond-slip deformations occurring at the interface between the reinforcement and the surrounding concrete can contribute up to 40% of the lateral deformation of the RC members.Despite the recognized importance of strain penetration effects on the response of RC structures, the consideration of such effects in numerical models is still limited. The employment of advanced bond-slip models within detailed finite element formulations, capable of simulating continuous domains with highly discretized meshes, has witnessed great advances over the recent years with encouraging results. Nonetheless, this modelling approach is computationally heavy and hence inapplicable for practical seismic (nonlinear) analysis of structures.Alternatively, the use of beam-column elements with lumped or distributed plasticity is a more computationally efficient and engineering-friendly modelling approach. Unfortunately, the elements of this type available in conventional numerical packages did not yet consider an explicit simulation of the interface between the reinforcing bars and the surrounding concrete along their embedment length. In other words, the inclusion of bond-slip effects in beam element models has been essentially achieved through simplified formulations based on empirical relationships.The present study aimed at overcoming the foregoing limitation by developing an explicit bond-slip model applicable to general fibre-based beam-column elements. Using a state-of-the-art bond-slip constitutive model, the current paper introduces a zero-length element that computes the localized member-end deformations accounting for the bond-slip response at each reinforcing bar of a given RC section. Along with the material properties and anchorage conditions, the proposed nonlinear model also accounts for cyclic degradation and rebar yielding effects. Validation studies conducted with the proposed numerical formulation reveal a good agreement with past experimental tests, evidencing an important stability and accuracy at the expense of an acceptable additional computational effort.
Year: 2017
Number Pages:
12p.
Author(s): Sousa, R.; Correia, A.A.; Almeida, J.P.; Pinho, R.
Editor: ACHISINA, IAEE
Keywords: Nonlinear analysis; Frame; Reinforced concrete; Bond-slip
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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
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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;
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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
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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
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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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LNEC-SPA, signal processing and analysis tools for civil engineers - Version 1.0
N/A
Year: 2007
Number Pages:
78pp.
Author(s): Mendes, L.; Campos Costa, A.
Info
Loss estimations for a reference situation
This report addresses the National Laboratory for Civil Engineering (LNEC) participation in Subproject 10 Earthquake disaster scenario predictions and loss modelling for urban areas. More precisely this report was developed in order to accomplish the 24 months LESSLOSS deliverable nº 85, which achieves loss estimates for the Metropolitan Area of Lisbon (MAL), for pre-defined scenarios earthquake. These loss estimations represent the reference situation to be compared with revised loss estimates after implementing mitigation actions with the ultimate goal of being established, in the next deliverable, the
Year: 2007
Author(s): Campos Costa, A.; Luísa Sousa, M.; Carvalho, A. M.
Keywords: Risk mitigation for earthquakes
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Loss estimations for a reference situation - Application to Lisbon Metropolitan Area
N/A
Year: 2007
Number Pages:
54pp.
Author(s): Campos Costa, A.; Sousa, M. L.; Carvalho, A. M.
Info
PROJECT NEFOREEE
N/A
Year: 2007
Number Pages:
189pp.
Author(s): Silva, M. J.; Bairrão, R.
Info
RELATÓRIO DE ACTIVIDADE DO PROJECTO USUET
N/A
Year: 2007
Number Pages:
60pp.
Author(s): Sousa, M. L.; Afonso, N.
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Enhancing seismic resistance and durability of natural masonry stone- Construction and 1st phase of the experimental program
The present report describes the construction of a model in limestone masonry for the user Group 3 oh the ECOLEADER Project, led by IRIDEX Construction Group, and the first phase of the experimental program developed in LNEC. The description of the construction, a photographic report and the results obtained on the characteristics tests made on the mortars used in the construction are presented.The construction was carried out by contractor José dos Santos Paixão on the basics of model details and materials specifications proposed by the User group 3, being NESDE/LNEC responsible for the guidance and supervision of the works.
Year: 2006
Author(s): Falcão Silva, M. J.; Candeias, P.; Campos Costa, A.; Bairrão, R.
Keywords: Ecoleader; Limestone masonry
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Shaking table tests of a reinforced concrete precast building system.
This report describes the first phase activity of the Portuguese group in the Precast Structures EC8 research projet. The Portuguese group is composed by Laboratório Nacional de Engenharia Civil (LNEC) and the Civibral, S.A. Precast Company.In this phase, seismic test were made in the LNEC
Year: 2006
Author(s): Mendes, L.; Coelho, E.; Campos Costa, A.
Keywords: Reinforced concrete; Shaking table tests
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Building stock inventory and vulnerability data for Lisbon Metropolitan Area
The present report addresses the first twelve months of LNEC participation in LESSLOSS
Year: 2005
Author(s): Campos Costa, A.; Luísa Sousa, M.; Coelho, E.
Keywords: Risk mitigation for earthquakes; Vulnerability
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Dinámica de bloques de piedra.
The dynamics of rigid bodies was studies by long time, because this phenomenon is important in the seismic security of some types of structures. However, there are few experimental studies. This job shows the experimental test carried out at the Laboratório Nacional de Engenharia Civil (LNEC) of Portugal. Four blue granites stones were tested, each one with different geometrical characteristics, under harmonic and random motions.A numerical simulation was carried out with the Discrete Element Method (DEM). This method has shown to be a good tool in the study of the dynamics of rigid bodies. It was proposed a new methodology to find the parameters of the DEM by using the parameters of classical theory.
Year: 2005
Author(s): Peña, F.; Campos Costa, A.; Lemos, J. V.
Keywords: Discrete Element Method (DEM); Dynamics of rigid bodies
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Seismic risk mitigation options and actions to be studied for Lisbon Metropolitan Area
The project LESSLOSS
Year: 2005
Author(s): Luísa Sousa, M.; Coelho, E.; Campos Costa, A.
Keywords: Seismic risk mitigation; Lisbon Metropolitan Area
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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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