^{a}and Guohai Chen

^{b}

^{a}yangdx@dlut.edu.cn

^{b}chengh_414@mail.dlut.edu.cn

This study focuses on the dynamic reliability assessment of building structures subjected to near-fault impulsive ground motions. Firstly, a stochastic synthesis model of near-fault pulse-like ground motion is established. The long-period velocity pulse is fitted to the single Gabor wavelet with five random parameters by the least square method, and the low-frequency acceleration components are achieved by differentiating the velocity pulse. The high-frequency components are then reproduced by a new spectral representation method with stochastic envelope function. Furthermore, the probability density evolution method (PDEM) is utilized to efficiently calculate the probability density functions of nonlinear dynamic responses of structures. To evaluate the first-passage dynamic reliability, an absorbing boundary condition is imposed in the generalized probability density evolution equation, so that the probability carried by the random event after crossing the safety domain will never be counted. Finally, the remarkable influences of fault distance and the occurrence instant of velocity pulse on dynamic reliability of buildings are scrutinized.