Papers
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Comportamento dinâmico de paredes de frontal Pombalino reforçadas
O estudo apresentado neste trabalho teve como objetivo caracterizar experimentalmente o comportamento dinâmico de paredes de frontal Pombalino, simples e reforçadas, por meio de ensaios na mesa sísmica triaxial do Laboratório Nacional de Engenharia Civil. Os ensaios incidiram sobre dois modelos em escala real nos quais se reproduziu o comportamento de paredes de frontal pombalino, simulando dois andares. Os principais objetivos do trabalho foram: avaliar o desempenho sísmico de paredes de frontal pombalino sem reforço; avaliar o desempenho da técnica de reforço com chapas metálicas nos nós da estrutura de madeira; identificar algumas deficiências no comportamento sísmico dos edifícios pombalinos.
Year: 2016
Number Pages:
13-22pp.
Author(s): Gonçalves, A.; Candeias, P.; Guerreiro, L.; Campos Costa, A.; Ferreira, J.
: RPEE
Editor: LNEC
Volume:
Série III, N.º 2.
Keywords: Ensaios dinâmicos; Edifícios pombalinos; Mesa sísmica; Paredes de frontal
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Education: Can a bottom-up strategy help for earthquake disaster prevention?
To comply with the need to spread the culture of earthquake disaster reduction, we rely on strategies that involve education. Risk education is a long-term process that passes from knowledge, through understanding, to choices and actions thrusting preparedness and prevention, over recovery. We set up strategies for prevention that encompass child and adult education, as a bottom-up approach, from raising awareness to reducing potential effects of disruption of society. Analysis of compulsory school education in three European countries at high seismic risk, namely Portugal, Iceland and Italy, reveals that generally there are a few State-backed plans. The crucial aspects of risk education concerning natural hazards are starting age, incompleteness of textbooks, and lack of in-depth studies of the pupils upon completion of their compulsory education cycle. Hands-on tools, immersive environments, and learn-by-playing approaches are the most effective ways to raise interest in children, to provide memory imprint as a message towards a culture of safety. A video game, Treme
Year: 2016
Number Pages:
2069
Author(s): Zonno , G.; Carvalho, A. M.; Sousa, M.; Musacchio, G; Falsaperla, S; Bernhardsdóttir, A.E.; Ferreira, M.A.
: Bulletin of Earthquake Engineering
Editor: Springer
Volume:
Volume 14, Issue 7.
Keywords: Seismic hazard; Risk reduction; Risk education; Disasters prevention
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Evolution of earthquake losses in Portuguese residential building stock
The evolution of the expected earthquake losses in different Portuguese regions was studied in order to determine whether the natural regeneration of buildings could contribute to the mitigation of seismic risk, although the building exposure has increased over time in most analysed regions. To achieve this goal, five inter-related risk indicators were estimated, based on the Portuguese censuses
Year: 2016
Number Pages:
2009-2029pp.
Author(s): Luísa Sousa, M.; Campos Costa, A.
: Bulletin of Earthquake Engineering
Editor: Springer
Volume:
Vol. 14, Issue 7.
Keywords: Seismic risk mitigation; Residential building stock; Portugal; Evolution of losses; Annualized human earthquake losses; Annualized economic earthquake losses
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Experimental assessment of the out-of-plane performance of masonry buildings through shaking table tests
This article presents the results of the LNEC-3D shaking table tests on two mock-ups, Brick House and Stone House, carried out in the scope of the workshop
Year: 2016
Number Pages:
28p.
Author(s): Candeias, P.; Campos Costa, A.; Mendes, N.; Costa, A.A.; Lourenço, P.
: International Journal of Architectural Heritage. Conservation, Analysis, and Restoration
Editor: Taylor & Francis
Keywords: Stone masonry; Shaking table tests; Seismic performance; Clay brick masonry
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O desafio da previsão do comportamento fora-do-plano de edifícios existentes em alvenaria
O comportamento sísmico de estruturas existentes em alvenaria é muito condicionado pelo seu comportamento fora-do-plano, originando os chamados mecanismos locais, existindo diversas metodologias que tentam prever o comportamento deste tipo de estruturas e/ou modos de colapso.Este trabalho pretende resumir os principais resultados obtidos num evento subordinado ao tema
Year: 2016
Number Pages:
73-82pp.
Author(s): Costa, A.A.; Mendes, N.; Campos Costa, A.; Lourenço, P.
: RPEE
Editor: LNEC
Volume:
Série III, N.º 2.
Keywords: Análise numérica; Mesa sísmica; Fora-do-plano; Alvenaria
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Shaking table testing for masonry infill walls: unreinforced versus reinforced solutions
Several factors influence the behaviour of infilled frames, which have been a subject of research in the past with moderate success. The new generation of European design standards imposes the need to prevent brittle collapse of the infills and makes the structural engineer accountable for this requirement, yet it fails to provide sufficient information for masonry infills design. Therefore, the present work aims at understanding the seismic behaviour of masonry infill walls within reinforced concrete frames, using both unreinforced and reinforced solutions (bed joint reinforcement and reinforced plaster). For this purpose, three reinforced concrete buildings with different infill solutions were constructed at a scale of 1:1.5, all with the same geometry, and were tested on the shaking table of the National Laboratory for Civil Engineering, Portugal. All solutions performed adequately for the design earthquake, with no visible damage. Still, the experimental tests show that the double-leaf-unreinforced infill walls underperformed during a large earthquake, collapsing out of plane by rotating as rigid bodies with multiple configurations. Also the reinforced concrete buildings collapsed, because of the adverse interaction with the infill walls. The infill walls with bed joint reinforcement and reinforced plaster did not collapse out of plane, because of their connection to the concrete frame, which is an essential requirement.
Year: 2016
Number Pages:
2241
Author(s): Lourenço, P.; Leite, J.; Campos Costa, A.; Candeias, P.; Mendes, N.; Paulo Pereira, M.F.
: Earthquake Engineering & Structural Dynamics
Editor: John Wiley & Sons Ltd
Volume:
Vol. 45, Issue 14.
DOI:
10.1002/eqe.2756
Keywords: Earthquake engineering; Shaking table test; Reinforced plaster; Bed joint reinforcement; Reinforced concrete frames; Masonry infills
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Sheds extratores e captadores de ar: influência da geometria e da dimensão das aberturas no desempenho da ventilação natural das edificações
A ventilação natural é uma eficiente estratégia projetual para ocondicionamento térmico passivo de edificações, ocorrendo por açãodos ventos, efeito chaminé ou pela combinação de ambos. Dentre asestratégias de ventilação, destacam-se os sheds, aberturas no telhado,que funcionam como captadores ou extratores de ar, dependendo de sualocalização em relação aos ventos dominantes. O objetivo desse artigo é avaliar ainfluência da variação na geometria dos sheds e na dimensão das aberturas deentrada e saída de ar no desempenho da ventilação natural. O sistema foi avaliadopara os ângulos de incidência dos ventos externos de 0° e 45° (extração) e 135° e180° (captação). A metodologia adotada foi a simulação por Dinâmica dos FluídosComputacional (CFD), utilizando como ferramenta o software CFX. Foramrealizadas análises quantitativas (taxas de renovação de ar/hora e coeficiente depressão nas aberturas) e qualitativas (planos de contorno e vetores de direção eintensidade do fluxo de ar). Os resultados indicam que sheds com geometriasaerodinâmicas e o aumento das aberturas de saída de ar incrementam o fluxo de arinterno. Para os sheds captadores o aumento isolado das aberturas de entrada de arnão proporciona uma melhora significativa na captação dos ventos pela cobertura.
Year: 2016
Number Pages:
83-104pp.
Author(s): Lukiantchuki, M.; Shimomura, A.; Marques da Silva, F.; Caram, R.
: Ambiente Construído
Editor: Associação Nacional de Tecnologia do Ambiente Construído
Volume:
v. 16, n. 1.
Keywords: Ventilação natural; Sheds
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Simulation of shake table tests on out-of-plane masonry buildings. Part (V): Discrete element approach
The analysis of the shaking table test of a 3-wall stone masonry structure performed with a discrete element model is presented. The numerical model, created with the code 3DEC, employed a rigid block representation and a Mohr-Coulomb joint model. Joint stiffness calibration to match the experimental natural frequencies is discussed, as well as the boundary conditions to simulate the shake table. Comparisons are made with the measured displacements at key locations, and the modes of deformation and fracture of the walls. The DEM model was able to reproduce important features of the shaking table tests. The experimental deformation and near collapse patterns were clearly identifiable in the numerical simulations, which produced displacements within the observed orders of magnitude, for the various levels of excitation.
Year: 2016
Number Pages:
9p.
Author(s): Lemos, J. V.; Campos Costa, A.
: International Journal of Architectural Heritage. Conservation, Analysis, and Restoration
Editor: Taylor & Francis
Keywords: Stone masonry; Shake table test; Numerical modelling; Dynamic response; Discrete elements
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Source and high-frequency decay parameters for the Azores region for stochastic finite-fault ground motion simulations
Strong ground motion prediction based on finite-fault simulation requires the identification of the fault (strike, dip, length and width), source kinematics parameters (stress drop, rupture velocity and slip distribution), regional crustal properties (geometrical spreading, anelastic structure, and upper crustal amplification and attenuation parameters) and the determination of amplification effects due to the local site geology. The general purpose of this study is to understand source and attenuation properties in the Azores, by the determination of stress drop, quality factor and kappa, through records obtained by the Portuguese digital seismic and accelerometer network. Source Spectra were obtained, for each record, after correcting observed spectra from geometrical spreading and anelastic attenuation effect: quality factor was estimated based on coda decay in the time domain and the kappa parameter was estimated by fitting the high-frequency decay of the acceleration spectrum with a straight line in a log-linear scale. Mean stress drop value was obtained considering that
Year: 2016
Number Pages:
1885
Author(s): Carvalho, A. M.; Vales , D.; Reis , Claudia .
: Bulletin of Earthquake Engineering
Editor: Springer
Volume:
Volume 14, Issue 7.
Keywords: Attenuation; Azores; High-frequency decay; Source spectra
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A method to correct the flow distortion of offshore wind data using CFD simulation and experimental wind tunnel tests
The assessment of wind energy resource for the development of deep offshore wind plants requires the use of every possible source of data and, in many cases, includes data gathered at meteorological stations installed at islands, islets or even oil platforms - all structures that interfere with, and change, the flow characteristics. This work aims to contribute to the evaluation of such changes in the flow by developing a correction methodology and applying it to the case of Berlenga island, Portugal. The study is performed using computational fluid dynamic simulations validated by wind tunnel tests. In order to simulate the incoming offshore flow with CFD models a wind profile, unknown a priori, was established using observations from two coastal wind stations and a power law wind profile was fitted to the existing data (alfa=0.165). The results show that the resulting horizontal wind speed at 80 m above sea level is 16% lower than the wind speed at 80 m above the island for the dominant wind direction sector.
Year: 2015
Number Pages:
87-94pp.
Author(s): Silva, J.; Marques da Silva, F.; Couto, A.; Estanqueiro, A.
: Journal of Wind Engineering and Industrial Aerodynamics
Editor: Elsevier
Volume:
140.
Keywords: Wind tunnel; Cfd simulation; Wind flow over hill; Offshore wind profile
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Comunicação
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Earthquake behaviour of 4 storeys reinforced concrete frame structures infilled with brick masonry panels.
This report analyses the influence of masonry infills in the earthquake behaviour of buildings with a reinforced concrete frame structure, four storeys high and a plan dimension of 20x15m2. Nonlinear analysis are performed using an ensemble of ground motions. Maximum ductility demand distributions are obtained. The values of the ductility coefficients are evaluated in terms of the vulnerability functions of the buildings and by comparison with the responses obtained in bare frame analyses and taking into account the probabilities of collapse.
Year: 1990
Number Pages:
144-153pp.
Author(s): Campos Costa, A.; Duarte, R.T.
Editor: The Kucherenko Tsniisk of the USSR Gosstroy
Volume:
Vol.2.
Keywords: Brick masory panels; RC frame
Info
Metodologia bayesiana para a quantificação da probabilidade de ruína e a otimização da análise
Apresenta-se uma metodologia bayesiana para estimar a relação não-linear ações efeitos das ações (função de vulnerabilidade) para efeitos de cálculo de probabilidade de ruína; embora a metodologia seja geral, ela é apresentada para o caso das ações sísmicas. Esta metodologia assenta numa quantificação não informativa de probabilidade á priori no espaço das funções de vulnerabilidade e o seu resultado é uma distribuição de probabilidade para o valor da probabilidade de ruína, as diversas etapas do cálculo são otimizadas por análise pré-posterior.
Year: 1990
Number Pages:
395-406pp.
Author(s): Duarte, R.T.; Ritto-Corrêa, M.; Vaz, C.T.; Campos Costa, A.
Editor: LNEC
Keywords: Metodologia bayesiana
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Nonlinear torsional design of R/C buildings under bi-directional seismic actions.
The objective of this paper is to characterize the earthquake behaviour of asymmetric buildings, with the purpose of assessing values of the behaviour coefficients and associated probabilities of failure. Buildings with a plan dimension of 20x15m2 and 8 storeys high are considered; their resisting elements are R/C frames and shear walls. The resistances of those elements were defined according to a given design processe and their nonlinear behaviour under earthquake actions was computed by step-by-step procedures and assessed by the maximum ductility demand defined in terms of moment curvature relations and by the probability of occurring prescribed global or local collapse mechanisms.
Year: 1990
Number Pages:
246-254pp.
Author(s): Campos Costa, A.
Editor: The Kucherenko Tsniisk of the USSR Gosstroy
Volume:
Vol.8.
Keywords: Asymmetric buildings; R/C buildings
Info
Simulação analítica do comportamento de pórticos de betão armado preenchidos com paredes de alvenaria, sob a ação de cargas horizontais repetidas e alternadas
Apresenta-se nesta comunicação o desenvolvimento de um modelo analítico adequado ao estudo do comportamento de estruturas reticuladas de betão armado preenchidos com paredes, não se pode considerar que os modelos já existentes resolvam completamente este problema de análise. Com efeito, o desenvolvimento de qualquer modelo analítico depara com a dificuldade que existe em simular a grande complexidade destas estruturas, devido à necessidade de modelar, por um lado, as paredes de alvenaria, material não homogéneo anisotrópico, e por outro, as condições de fronteira das paredes com os elementos dos pórticos que influenciam o comportamento global destas estruturas, quando sujeitas a ações horizontais alteradas.
Year: 1990
Number Pages:
225-236pp.
Author(s): Campos Costa, A.; Pires, F.; Cansado Carvalho, E.; Ribeiro, J.P.
Editor: LNEC
Keywords: Estruturas reticuladas; Pórticos de betão armado; Paredes de alvenaria
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A otimização do comportamento das estruturas e a definição de coeficientes de ductilidade locais.
Definem-se coeficientes de ductilidade locais no contexto dos
Year: 1989
Number Pages:
147-156pp.
Author(s): Duarte, R.T.; Campos Costa, A.; Costa, A.
Editor: LNEC
Keywords: Comportamento sísmico; Coeficientes de ductilidade
Info
Cálculo de coeficientes de comportamento.
Apresenta-se neste trabalho uma metodologia para o cálculo de coeficientes de comportamento de estrutura, a serem usadas na verificação da segurança em relação á ação dos sismos. Estes coeficientes são definidos em relação a métodos de dimensionamento específicos e quantificados com base no valor da probabilidade de ruína que se pretende atingir. Exemplifica-se esta matéria através da análise de dimensionamento e verificação de segurança de estruturas univariáveis. Indica-se a metodologia a seguir para casos mais gerais.
Year: 1989
Number Pages:
399-409pp.
Author(s): Duarte, R.T.; Oliveira, C.S.; Costa, A.; Campos Costa, A.
Editor: LNEC
Keywords: Ações sísmicas; Coeficientes de comportamento
Info
Idealização de ações sísmicas por um modelo estocástico não-estacionário.
Apresenta-se nesta comunicação um modelo não-estacionário para idealizar ações sísmicas. Neste modelo e não-estacionariedade verifica-se quer na intensidade quer na distribuição espectral, a sua definição, que é feita com base num espetro de potência e numa função de modulação, permite a sua quantificação a partir de um espetro de resposta de uma forma muito direta, através, através do algoritmo clássico de transformação espectro de resposta-espectro de potência. Apresenta-se, como ilustração, a quantificação de um modelo não-estacionário pelo espetro de resposta do Eurocódigo8.
Year: 1989
Number Pages:
95-103pp.
Author(s): Campos Costa, A.; Duarte, R.T.
Editor: LNEC
Keywords: Ações sísmicas; Modelos estocásticos
Info
Influência das condições geotécnicas locais na ação sísmica.
Pretende-se com este trabalho mostrar a influência das condições geotécnicas locais da definição da ação sísmica a usar num determinado local. Par ao efeito é usado um modelo de comportamento histerético do solo em termos das suas relações tensões tangenciais-distorsão, identificando-se as suas propriedades a partir do conhecimento geotécnico do local. Partindo-se da ação sísmica ao nível da superfície como a qualquer profundidade, usando-se um programa de análise dinâmica não linear de colunas de solo isoladas (1-D) ou em associação (2-D), atuadas por movimentos horizontais.Com os resultados obtidos define-se a função de transferência entre o
Year: 1989
Number Pages:
11p.
Author(s): Costa, A.; Campos Costa, A.; Oliveira, C.S.
Editor: Sociedade Portuguesa de Geotecnia
Volume:
Vol. 3.
Keywords: Ação sísmica; Influência das condições geotécnicas
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Influência dos painéis de enchimento de alvenaria do comportamento sísmico de edifícios simétricos com 4 pisos de estrutura em pórtico de betão armado.
Apresenta-se neste trabalho o estudo da influência de painéis de enchimento de alvenaria no comportamento sísmico de edifícios simétricos com 4 pisos e estrutura em pórtico de betão armado. Consideram-se 4 processos de dimensionamento diferentes e os resultados são comparados comos obtidos para estruturas sem painéis de enchimento. Conclui-se que a resistência da estrutura é fundamentalmente a resistência do pórtico de betão armado e que os painéis não agravam nem minoram significativamente os efeitos da ação sísmica.
Year: 1989
Number Pages:
289-299pp.
Author(s): Campos Costa, A.; Duarte, R.T.
Editor: LNEC
Keywords: Painéis de enchimento; Edifícios simétricos; Comportamento Sísmico
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Observação do comportamento dinâmico da barragem da Aguieira.
Apresenta-se e técnica e os resultados de uma campanha de ensaios de vibração realizada na barragem de Aguieira. Foram efetuados ensaios de vibração forçada em eu se obtiveram as funções de transferência dos deslocamentos em diversos pontos da barragem e ensaios de ruído ambiente e funcionamento dos grupos em que se obtiveram os espetros de Fourier dos sinais em deslocamentos.
Year: 1989
Number Pages:
309-318pp.
Author(s): Câmara, R.; Campos Costa, A.; Pinto, A.; Portugal, A.
Editor: LNEC
Keywords: Comportamento dinâmico; Barragem da Aguieira
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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
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
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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.
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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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
Info
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
RELATÓRIO DE ACTIVIDADE DO PROJECTO USUET
N/A
Year: 2007
Number Pages:
60pp.
Author(s): Sousa, M. L.; Afonso, N.
Info
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
Info
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
Info
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
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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