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Indexed by:会议论文

Date of Publication:2009-01-01

Included Journals:CPCI-S

Page Number:1282-1287

Key Words:train-bridge system; horizontal earthquake; pseudo-excitation method; precise integration method; non-stationary random vibration; first-passage failure

Abstract:Non-stationary random vibration and extreme value estimation method of 3-dimensional coupled train-bridge systems subjected to the action of lateral horizontal earthquake are investigated based the pseudo-excitation method (PEM). The horizontal earthquake is assumed to be a uniformly modulated non-stationary random process, while the track irregularity excitations are assumed to be uniformly modulated multi-phase non-stationary random processes. The pseudo-excitation method is firstly proved to be still valid for such time-dependent systems, and is then applied to transform the random excitations of horizontal earthquakes and track irregularities into a series of deterministic pseudo harmonic excitations, respectively. Furthermore, the precise integration method (PIM) is extended to solve the corresponding pseudo responses efficiently and precisely. After obtaining the time-dependent PSD and RMS, a new formula for estimating the maximum value for such non-stationary random responses is suggested based on the first-passage failure criterion. The effectiveness and accuracy of the proposed method and the reliability of the maximum value estimation formula are justified numerically by the time history method, and the influences of site soil and train speed on system random responses are illustrated and discussed.