Abstract
Abstract
The common seismic fragility analysis methods are mainly inaccurate due to assumptions made in derivation process or time consuming because of large sample analysis. A new approach based on lognormal mixture model (LMM) is presented for seismic fragility analysis of long-span bridges, where LMM is used to calculate the structural demand distributions and the seismic fragility is obtained through cumulative distribution function. To demonstrate the feasibility of the present approach, seismic fragility analysis is carried out on a long-span suspension bridge with a main span of 1200m. The results show that the present approach has higher accuracy than the classical approach.