张志超

个人信息Personal Information

教授

博士生导师

硕士生导师

性别:女

毕业院校:大连理工大学

学位:博士

所在单位:化学学院

学科:化学生物学. 药理学. 细胞生物学

办公地点:Chemical complex building,D513

联系方式:zczhang@dlut.edu.cn 13942696903

电子邮箱:zczhang@dlut.edu.cn

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Random vibration of a train traversing a bridge subjected to traveling seismic waves

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论文类型:期刊论文

发表时间:2011-12-01

发表刊物:ENGINEERING STRUCTURES

收录刊物:Scopus、SCIE、EI

卷号:33

期号:12

页面范围:3546-3558

ISSN号:0141-0296

关键字:Train-bridge system; Pseudo-excitation method; Earthquake; Wave passage effect; Non-stationary random vibration; Track irregularity

摘要:Non-stationary random vibration of 3D time-dependent train-bridge systems subjected to multi-point earthquake excitations, including wave passage effect, is investigated using the pseudo-excitation method (PEM). The motion equation of such a system is established by coupling the train and bridge through wheel-rail contact relationships and accounting for the phase-lags between pier excitations. The horizontal and vertical earthquake excitations are both assumed to be uniformly modulated, fully coherent random excitations with different phases, while the excitation due to track irregularities is assumed to be a 3D, fully coherent random excitation with velocity-dependent time lags. PEM is first proven to be applicable to such time-dependent systems, and is then used to transform the random excitations into a series of deterministic pseudo excitations. By solving for the corresponding deterministic pseudo responses, various non-stationary random responses, including the time-dependent power spectral density functions (PSD) and standard deviations (SD), can be obtained easily. A case study is then presented in which the China-Star high-speed train traverses a seven-span continuous bridge that is being excited by an earthquake. The results show the effectiveness and accuracy of the proposed method by comparison with a Monte Carlo simulation. Additionally, the influences of seismic apparent wave velocity and train speed on the system random responses are discussed. (C) 2011 Elsevier Ltd. All rights reserved.