Evaluation of the seismic vulnerability of the unreinforced masonry buildings constructed in the transition between the 19th and 20th centuries in Lisbon, Portugal

Ana Gabriela Gaspar Simões

Key information

Authors:

Ana Gabriela Gaspar Simões (Ana Gabriela Gaspar Simões)

Supervisors:

Rita Maria Do Pranto Nogueira Leite Pereira Bento (Rita Maria Do Pranto Nogueira Leite Pereira Bento)

Published in

03/21/2018

Abstract

The main objective of this work is to evaluate the seismic vulnerability of the unreinforced masonry buildings constructed in the transition between the 19th and 20th centuries in Lisbon, Portugal. It is proposed to define the seismic vulnerability based on the derivation of fragility functions supported on detailed numerical models and displacement performance-based assessment approaches. A detailed architectural and structural characterization of the buildings is performed based on a multidisciplinary approach. A group of three buildings, representative of a sub-type of buildings, is defined as case of study in order take into account the effect of the block of buildings. The main variations within the typology, in terms of geometry, constructive details and materials are identified. These variations are assumed as epistemic uncertainties and treated through the logic-tree approach. The analysis of the seismic behaviour addresses the global response of the structure, mainly governed by the in-plane capacity of the walls, and the local response, related to the activation of out-of-plane collapse mechanisms of parts of the structure. The assessment comprehends the comparison between the displacement capacity of the structure, identified for different performance limit states, and the seismic demand, expressed by a properly reduced acceleration-displacement response spectrum. The evaluation of the corresponding seismic intensity measure is obtained from the application of the Capacity-Spectrum Method.