Resilience assessment and seismic risk assessment of reticulated shell structures considering multiple uncertainties

In response to the shortcomings of the Chinese code GB/T 38591-2020 and based on the multi-parameter resilience evaluation indicator for reticulated shell structures, the seismic resilience assessment system for reticulated shell structures considering multiple uncertainties in the seismic resilience assessment process (record-to-record, structural design parameters, resilience evaluation indicators, and modelling) is established using the square-root-sum-of-squares (SRSS) method. The seismic risk assessment method based on seismic resilience is proposed by combining the traditional seismic risk assessment method with emerging seismic resilience. The range and recommended values of each uncertainty index are obtained through many randomly selected reticulated shell calculation examples, and two large shaking table reticulated shell test models are used as examples for the resilience assessment considering multiple uncertainties and seismic risk assessment based on seismic resilience. The results show that the seismic resilience assessment system considering multiple uncertainties effectively avoids a large amount of calculation work and that the researcher can quantitatively and intuitively know the probability of different resilience levels occurring in a building under a certain ground motion intensity. The 50-year probabilities of exceedance considering four types of uncertainties are 1.7 similar to 2.5 times the probabilities determined when only considering the uncertainties of record-to-record and structural design parameter, indicating that the potential risk of reticulated shell structures may be underestimated if the effects of each uncertainty are not fully considered in seismic risk assessment. The study has implications for risk guidance and data basis provision in seismic resilience and seismic risk assessment of reticulated shell structures.

Automated summary

In response to the shortcomings of the Chinese code GB/T 38591-2020, a seismic resilience assessment system for reticulated shell structures considering multiple uncertainties is established. The study introduces the square-root-sum-of-squares (SRSS) method and proposes a seismic risk assessment method based on seismic resilience. Through examples and testing, the study demonstrates the effectiveness of the seismic resilience assessment system in considering multiple uncertainties and highlights the potential risk of underestimating seismic risk if uncertainties are not fully considered.