22/05/2013 - Training Course - FUNDEC

"Avaliação Sísmica e Reforço de Edifícios Antigos de Alvenaria” Coordenação Prof. Rita Bento

Resumo

Em Portugal não se tem dedicado suficiente atenção às vulnerabilidades dos edifícios antigos de alvenaria associadas ao risco sísmico. No entanto, nas futuras iniciativas de reabilitação urbana, que se espera virem a revitalizar o sector da construção civil, e de acordo com a recente lei 32/2012 (artºs 51, 53 e 77), esse aspecto não pode ser negligenciado e serão necessários estudos de avaliação da resistência sísmica dos edifícios existentes. Actualmente é possível simular o complexo comportamento sísmico das construções antigas através de modelos computacionais, mas tais modelos requerem a quantificação de sofisticados parâmetros mecânicos. Constata-se ser reduzido o número de estudos experimentais que caracterizem esses parâmetros e os existentes na literatura são, na maior parte dos casos, relativos a realidades construtivas diferentes da nossa. No presente curso serão apresentados diferentes metodologias para simulação do comportamento estrutural de edifícios antigos e, entre outros, os resultados das campanhas experimentais realizadas no âmbito do projecto FCT “Vulnerabilidade sísmica de edifícios antigos de alvenaria”.Pretende-se com este curso:

• Identificar as características dos edifícios antigos de alvenaria da cidade de Lisboa

• Apresentar os principais resultados obtidos para a caracterização mecânica dos materiais e para a modelação monotónica e cíclica dos edifícios.

• Apresentar os principais tipos de modelação computacional (linear e não linear) deste tipo de estrutura e as potencialidades dos diferentes procedimentos.

• Apresentar diferentes soluções de reabilitação e de reforço de edifícios de alvenaria.

Program Course

For further information please contact Prof. Rita Bento ( This e-mail address is being protected from spambots. You need JavaScript enabled to view it )

10/10/2011 - Seminar

"Detailed and simplified non-linear models for timber-framed masonry structures” by Prof. Andreas Kappos

Abstract

The need for improved methodologies to describe the post-elastic behaviour of existing structures in the framework of seismic vulnerability assessment has long been recognised. The study presented herein deals with the non-linear seismic response of timber-framed (T-F) masonry structures, such as those found in traditional edifices of cultural heritage. T-F masonry generally consists of masonry walls reinforced with timber elements, including horizontal and vertical elements, as well as X-type diagonal braces. Since the Bronze Age T-F buildings were common in regions where moderate-to-strong earthquakes were frequent. There is ample historical evidence that the embodiment of timber elements in masonry walls is closely related to earthquakes. The paper focuses on the description of the seismic response of T-F structures by means of a detailed analytical model. Although elastic analysis can adequately identify regions with high stresses, it fails to capture the redistribution of stresses and the ensuing failure mechanism. The simulation of T-F masonry is made here using a plasticity model. Non-linear laws for the materials, such as a trilinear stress-strain curve for monotonic loading of timber and a Mohr-Coulomb contact law for wooden members, are used to express their behaviour under moderate and high stress levels. An associated flow rule is assumed and Hill's yield criterion is adopted with isotropic work-hardening. Masonry infills are not included in the model due to their insignificant contribution after the initial elastic stage of the response. The proposed finite element model is intended for a detailed non-linear static analysis of parts of a building. A simplified model using beam and link elements with non-linear axial springs is also developed, which is appropriate for 2D non-linear analysis of common buildings. Both models are validated using experimental results of three T-F masonry walls obtained from the literature. Finally a non-linear static analysis of the façade of an existing building situated in the island of Lefkas, Greece is performed.

Seminar Presentation

For further information please contact Prof. Rita Bento ( This e-mail address is being protected from spambots. You need JavaScript enabled to view it )

09/09/2011 - Research Grant

Within the scope of the Portuguese national FCT research project (PTDC/ECM/100872/2008), named "Seismic Vulnerability of Old Masonry Buildings", the Instituto de Engenharia de Estruturas, Território e Construção - ICIST will be open one research scholarship.

The successful candidates will develop numerical and experimental activities with the purpose of mechanical characterization of masonry walls, identification of expected failure modes and calibration of analytical models. The working language is English. The successful candidates will receive a salary in accordance with the FCT rules. The contract offered will have duration of up to 6 months, renewable subject to mutual agreement.

For further information please contact ICIST (+351-218418432, This e-mail address is being protected from spambots. You need JavaScript enabled to view it )