Fragility Functions for Tall URM Buildings around Early 20th Century in Lisbon. Part 1: Methodology and Application at Building Level

Abstract

The article proposes a procedure for the derivation of fragility functions for unreinforced masonry buildings considering the in-plane and out-of-plane response. Different approaches are considered for the generation of the corresponding fragility functions and for the evaluation of the propagation of uncertainties. The contributions for the dispersion of the fragility functions account for the variability in the definition of the capacity, the aleatory uncertainty in the definition of the seismic demand and the aleatory uncertainty in the definition of the modified/floor response spectrum, when the local mechanisms are located in the upper level of the building. In the end, the individual fragility curves are properly combined in order to define a single fragility curve for the class of buildings. As a case study, the procedure is applied to the assessment of one of the most vulnerable unreinforced masonry buildings constructed in the early 20 th century in Lisbon, considering a typical prototype building with five storeys high. Results for a seismic event, as defined in the earthquake-resistant code for Lisbon, indicate that the typical building has about 50% probability of having heavy damage and about 30% probability of collapse.

Probabilistic seismic assessment of a high-rise URM building

“…In this work, the importance of measuring the vulnerability of structures taking into account the variability of the involved mechanical variables is highlighted. Through the use of procedures included in the CSBM and from a probabilistic approach, it is possible obtaining fragility curves containing and revealing the randomness transmitted by the parameter's variability [11][12][13][14][15][16][17].…”

Fragility functions for local failure mechanisms in unreinforced masonry buildings: a typological study in Ferrara, Italy

“…More recent studies propose fragility functions for OOP mechanisms based on kinematic limit analysis (Zuccaro et al 2017). Simões et al (2019aSimões et al ( , b, 2020 developed fragility functions for URM buildings combining in-and out-of-plane wall responses. In particular, for the OOP response, nonlinear kinematic analyses were used in that work.…”

Fragility Functions for Local Failure Mechanisms in Unreinforced Masonry Buildings

“…More recent studies propose fragility functions for OOP mechanisms based on kinematic limit analysis (Zuccaro et al 2017). Simões et al (2019aSimões et al ( , b, 2020 developed fragility functions for URM buildings combining in-and out-of-plane wall responses. In particular, for the OOP response, nonlinear kinematic analyses are used.…”