Seismic fragility analysis of masonry structures considering the effect of mainshock-aftershock sequences

Yongqun Zhang, Zhuolin Wang*, Lixue Jiang, Konstantinos Skalomenos, Dongbo Zhang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

Earthquake investigations indicate that strong aftershocks can further aggravate the structural damage and low attention has been given to understand the seismic performance of masonry structures under seismic sequences. This manuscript studies the seismic fragility of masonry structures considering the effect of aftershocks by proposing a simplified probabilistic approach. In total, 36,000,000 stochastic earthquake-structure samples were generated using Monte Carlo simulation to consider the uncertainty of earthquake ground motions and structures, while seismic fragility curves of masonry structures were obtained by considering the following parameters: 1) aftershock intensity, 2) seismic wall area ratio, 3) site conditions, 4) the number of storeys, 5) reinforced concrete (RC) tie column, 6) mortar strength. The interstorey drift ratio was employed to assess the structural performance levels. The results showed that strong aftershocks have a significant influence on the fragility curves of masonry structures. The probability of exceeding the collapse limit state of structures can increase by 32.2% due to aftershock effect. Among the examined parameters it was found that the number of storeys has the greatest effect on the seismic fragility of masonry structures. By increasing the number of storeys, the probability of exceedance of the collapse damage state can increase up to 28.7%. The derived fragility curves are validated against a finite element method, which indicate the rationality of the proposed methodology.

Original languageEnglish
Article number115287
Number of pages11
JournalEngineering Structures
Volume275
Early online date24 Nov 2022
DOIs
Publication statusPublished - 15 Jan 2023

Bibliographical note

Funding Information:
The authors would like to acknowledge the financial support provided by Scientific Research Fund of Institute of Engineering Mechanics, China Earthquake Administration (Grant No.2021D30), Natural Science Foundation of Shanghai (Grant No.21ZR1455000) and Shanghai Science and Technology Commission Program (Grant No. 19DZ1202400).

Publisher Copyright:
© 2022

Keywords

  • Fragility curves
  • Mainshock-aftershock sequences
  • Masonry structures
  • Seismic performance assessment
  • Uncertainty

ASJC Scopus subject areas

  • Civil and Structural Engineering

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