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Seismic vulnerability assessment and fragility analysis of pre-code masonry buildings in Portugal

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Abstract

Despite the fact that in recent years Portugal has not seen the occurrence of high-magnitude earthquakes, it remains threatened by these events due to its geographic location. Since the 1960s, reinforced concrete has been the most used material for new constructions; however, the historic urban centers are dominated by old unreinforced masonry (URM) buildings, which techniques and construction materials have evolved since the Great Lisbon earthquake that occurred in 1755 (Mw = 8.5). Given the presence of these buildings in areas of significant seismicity, extensive research is needed to assess the seismic risk and define mitigation policies. This kind of studies is often supported by empirical methods and based on expert judgment due to the high variability of the building stock and lack of information. The main purpose of this work is: (i) to provide analytical fragility curves, supported by nonlinear static analysis, for the entire population of old masonry buildings, built before the introduction of the first design code for building safety against earthquakes (RSSCS) in 1958; (ii) define vulnerability curves to be used by the technical community for seismic assessment of pre code URM buildings. The characterization of the building stock geometry and material properties is based on information previously collected, which was essential to define representative archetypes and typologies.

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Notes

  1. Set of vertical long boards connected by horizontal small wood stripes, normally filed with pieces of bricks and lime mortar.

  2. Set of plane wood trusses very common in “Pombalino” typology.

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Funding

This work was supported by the Foundation for Science and Technology (FCT) under Grant number PD/BD/135325/2017 in the scope of the InfraRisk Doctoral Programme—Analysis and Mitigation of Risks in Infrastructures.

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Authors and Affiliations

  1. Earthquake Engineering and Structural Dynamics Unit Structures Department, National Laboratory for Civil Engineering, Av. do Brasil 101, 1700-066, Lisbon, Portugal

    Vasco Bernardo, Alfredo Campos Costa & Paulo Candeias

  2. Department of Civil Engineering, University of Aveiro, 3810-193, Aveiro, Portugal

    Aníbal Costa

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  1. Vasco Bernardo
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  2. Alfredo Campos Costa
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Correspondence to Vasco Bernardo.

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Bernardo, V., Campos Costa, A., Candeias, P. et al. Seismic vulnerability assessment and fragility analysis of pre-code masonry buildings in Portugal. Bull Earthquake Eng 20, 6229–6265 (2022). https://doi.org/10.1007/s10518-022-01434-8

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