Seismic risk and vulnerability models considering typical urban building portfolios.

The seismic risk and vulnerability of urban building clusters are fundamental indicators for quantifying urban seismic resilience. The empirical vulnerability and risk models developed using various risk probability assessment theories and real seismic loss observation data from typical building clusters can provide positive references for predicting and evaluating urban earthquake resilience. However, the data used to validate and optimize the vulnerability and resilience models of building portfolios are mostly discrete points within a city. The coupling effect of multiple intensity measures is rarely considered, resulting in a relatively low evaluation accuracy of the established seismic hazard model. This study considers the comprehensive impact of macroseismic and instrumental intensity on the vulnerability of typical urban building portfolios. A multidimensional parameter seismic risk and vulnerability model considering updated damage states is proposed. Based on field inspection data from the 2008 Wenchuan earthquake in China, an optimized hazard and vulnerability model considering all the buildings (8669 buildings) in Dujiangyan city was developed. An innovative structural vulnerability membership index was proposed to estimate the correlation between typical damage states, and vulnerability correlation parameter models were developed. An improved nonlinear vulnerability regression model considering hybrid intensity measures was proposed, and vulnerability comparison curves and matrices were generated considering the empirical damage data of buildings in Dujiangyan city. An optimized seismic damage index calculation model was developed considering five typical building portfolios in Dujiangyan city. [ABSTRACT FROM AUTHOR]