Seismic risk assessment for precast RC frame-shear wall structures subject to mainshock-aftershock sequences

• Published in: Structures (Oxford) Vol. 76; p. 108977
• Main Authors: Deng, Xisheng, Li, Zhikang, Wang, Yan, Zhou, Zijuan, Zhu, Yilin
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.06.2025
• Subjects: Bayes updating formula; Copula function; Mainshock-aftershock sequences; Precast RC frame-shear wall structure; Seismic risk assessment; Seismic risk assessment; Copula function; Bayes updating formula; Precast RC frame-shear wall structure; Mainshock-aftershock sequences
• ISSN: 2352-0124; 2352-0124
• DOI: 10.1016/j.istruc.2025.108977

To evaluate the seismic risk of precast frame-shear wall structures when subjected to mainshock-aftershock (MS-AS) sequences, the unknown parameters of the probability demand model are estimated using the Bayesian updating formula. The joint distribution model of MS-AS is established based on the copula function. Finally, the results of the fragility and hazard analyses are input into the classical risk equation to assess the risk of the structure. Simultaneously, confidence intervals are established for the fragility and seismic demand risk curves, while accounting for the uncertainties of the model parameters. The results show that, the seismic demand risk of the structure subjected to MS-AS sequences is 2.3–5.9 times of that subjected to MS-only during the 50-year service life of the structure. Therefore, seismic risk assessment for precast frame-shear wall structures subjected to MS-AS sequences should account for the effect of ASs.