Stochastic Transverse Earthquake-Induced Damage Track Irregularity Spectrum Considering the Uncertainty of Track-Bridge System

Author:

Feng Yulin12,Hou Yu12,Jiang Lizhong34,Zhou Wangbao34,Yu Jian34,Guo Wenjie12

Affiliation:

1. School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang 330013, P. R. China

2. State Key Laboratory of Performance Monitoring and Guarantee of Rail Transportation Infrastructures, Nanchang 330013, P. R. China

3. School of Civil Engineering, Central South University, Changsha 410075, P. R. China

4. National Engineering Laboratory for High-Speed Railway Construction, Changsha 410075, P. R. China

Abstract

The track irregularity spectrum of longitudinally connected ballastless track (LCBT)-bridge systems of high-speed railway was proposed in this paper. First, a simulation model of an LCBT-continuous girder bridge was established by considering the influences of approach bridges and subgrade with track structure. Further, a large number of sample analyses were carried out by taking into account the uncertainty of LCBT-bridge systems and stochastic behaviors of ground motions based on the simulation model. The damage laws of residual deformation of track-bridge system after earthquake actions were studied. Then, an interlayer deformation coordination relationship (IDCR) considering the track irregularity caused by earthquake-induced damage of bearings was developed, and the superposed track irregularity samples were obtained. Finally, by using the improved Blackman–Turkey method and Levenberg–Marquardt algorithm, the LCBT irregularity spectrum, track irregularity spectrogram, track irregularity limit spectrum, and a fitting formula for the track irregularity spectrum on a bridge after the action of earthquakes were obtained. Results obtained from the fitting formula and IDCR were compared, and they indicated that tracks undergone significant high-frequency irregularity diseases after the earthquake action. It was found that the track irregularity spectrum could be roughly divided into three ranges: high-, medium- and low-frequency wavebands. Consequently, this led to an application of a three-segment power function for the fitting of the track irregularity spectrum after the earthquake action. The track irregularity spectrum after the action of earthquakes provides an important theoretical basis for the establishment of seismic design methods for high-speed railway bridges based on the traffic safety performance.

Funder

Jiangxi Provincial Education Department

National Natural Science Foundation of China

Hunan Innovative Provincial Construction Project

Jiangxi Provincial Natural Science Foundation

Publisher

World Scientific Pub Co Pte Ltd

Subject

Applied Mathematics,Mechanical Engineering,Ocean Engineering,Aerospace Engineering,Building and Construction,Civil and Structural Engineering

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