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Comparative efficiency analysis of different nonlinear modelling strategies to ...
Hugo Rodrigues; Humberto Varum; António Arêde; Aníbal CostaThe performance of different nonlinear modelling strategies to simulate the response of RC columns subjected to axial load combined with cyclic biaxial horizontal loading is compared. The models studied are classified into two categories according to the nonlinearity distribution assumed in the elements: lumped-plasticity and distributed inelasticity. For this study, results of tests on 24 columns subjected to ...
Experimental testing, numerical modelling and seismic strengthening of traditio...
Alexandre A. Costa; António Arêde; Aníbal Costa; João Guedes; Bruno SilvaStone masonry is one of the oldest building techniques used worldwide and it is known to exhibit poor behaviour under seismic excitations. In this context, this work aims at assessing the in-plane behaviour of an existing double-leaf stone masonry pier by experimental testing. Additionally, a detailed 3D finite element numerical analysis based on micro-modelling of the original pier is presented (fully describi...
Retrofit of RC Hollow Piers with CFRP Sheets
Delgado, Pedro; António Arêde; Nelson Vila Pouca; Patricio Rocha; Aníbal Costa; Raimundo DelgadoHollow bridge piers, particularly those built before the seventies, often have insufficient shear capacity due to inadequate transverse reinforcement details. Therefore, special attention must be given to this very important aspect when reinforced concrete (RC) piers with hollow sections are analysed and retrofitted. This paper covers the experimental analysis of retrofit solutions using CFRP sheets along the p...
Out-of-plane behaviour of existing stone masonry buildings: experimental evalua...
Costa, Alexandre A.; António Arêde; Aníbal Costa; Carlos Sousa OliveiraMasonry structures can be considered as the simplest type of structures concerning its assemblage but, at the same time, it is one of the most complex construction materials in terms of mechanical properties and correct behaviour assessment. In this context, the work herein presented aims at describing an experimental testing campaign recently carried out in order to characterize the out-of-plane behaviour of t...
Seismic Analysis of a Building Block. Bulletin of Earthquake Engineering
Nuno Neves; António Arêde; Aníbal CostaThis paper reports on the study of the seismic response of an urban building block located in Faial, a town of the Horta Island of the Azores, Portugal. The work fits within the framework of studying strengthening schemes suitable for the reconstruction process of a town damaged by an earthquake action and includes numerical modelling of all the building blocks with calibration of material and structural parame...
A comparative analysis of energy dissipation and equivalent viscous damping of ...
Rodrigues, Hugo; Humberto Varum; António Arêde; Aníbal CostaThe hysteretic behaviour of RC columns has been object of many experimental studies over the past years. However, the majority of these studies are focused on unidirectional loading. An experimental program was carried out where 24 columns were tested for different loading histories, under uniaxial and biaxial conditions. The experimental results are presented in this paper and are discussed in terms of global ...
Modelação de pilares ocos de betão armado e influência dos efeitos de corte na ...
Nelson Vila Pouca; António Arêde; André Monteiro; Pedro Delgado; Patricio Rocha; Aníbal Costa; Raimundo DelgadoO comportamento cíclico de pilares de pontes de betão armado é reconhecidamente influenciado pelo corte. Isso é particularmente visível em pilares ocos onde, frequentemente, o mecanismo de deformação e rotura é dominado pelo esforço transverso. Dado que os códigos de dimensionamento são geralmente conservativos na avaliação desses efeitos este trabalho pretende apresentar a influência do corte na resposta numér...
Aplicações numéricas do modelo de dano a pilares ocos de betão armado
Pedro Delgado; Nelson Vila Pouca; António Arêde; Aníbal Costa; Raimundo DelgadoA grande motivação deste trabalho reside na particularidade do comportamento estrutural de pilares de betão armado com secção transversal oca, bastante semelhante aocomportamento de paredes estruturais, e, também, na elevada dificuldade de modelar asua resposta cíclica com ferramentas numéricas simples. De facto, os pilares ocos de pontes têm, normalmente, secções transversais com grandes dimensões e armadura l...
Reabilitação e Reforço Sísmico de Pilares de Pontes
Raimundo Delgado; Pedro Delgado; Nelson Vila Pouca; António Arêde; Patrício Rocha; Aníbal CostaPontes e viadutos têm evidenciado, durante a ocorrência de sismos, uma grande vulnerabilidade à acção sísmica, resultante de não terem sido dimensionados para resistir a esta acção, ou dimensionadas para baixos níveis de intensidade sísmica, ou devido a deficiente pormenorização das armaduras. Especialmente nas pontes com pilares ocos em betão armado, o efeito de corte assume uma grande importância no seu comp...
Probabilistic risk assessment of RC building structures with masonry infills
Hugo Rodrigues; Humberto Varum; Aníbal Costa; Xavier Romão; António Arêde; Raimundo DelgadoThe study of the seismic vulnerability of existent buildings in urban areas with moderated/high seismic risk is of extreme importance. Earthquake engineering experts, public authorities and general public alike agree on the idea that the assessment of the seismic safety and performance of the built environment is a matter of high priority. The proposed paper aims to carry out a structural fragility study where ...
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