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Analysis of seismic damage features of HSR CRTS III SBT simply supported bridge system

Liu Lili, Jiang Lizhong, Zhou Wangbao, Liu Xiang, Feng Yulin

Archives of Civil and Mechanical Engineering

2023

Vol. 23, no. 2

art. no. e76, 2023

In order to investigate the seismic damage features of high-speed railway (HSR) China Railway Track Slab III (CRTSIII) slab ballastless track (SBT) simply supported bridge systems, a nonlinear finite element model of HSR CRTS III SBT simply supported bridge system was established. The damage mechanisms and peak and residual displacement distribution patterns of their critical components under seismic action were investigated. In addition, the sensitivity of rail irregularity to the seismic residual deformation in such critical components was analyzed. The results indicated that midspan piers and bearings are more susceptible to failure than side span piers and bearings, and fixed bearings are more prone to failure than sliding bearings. Fastener and isolation layer deformation increases sharply on both sides of the beam joint. Rail deformation exhibits a parabolic shape that is large in the middle and small at both ends. The critical components of even-span and odd-span systems have significantly different patterns of seismic deformation distribution. Rail irregularity is mainly attributable to bearing residual deformation, pier residual deformation, and fastener residual deformation successively, and the superposition of bearing residual deformation and pier residual deformation is approximately equivalent to rail deformation. Rail irregularity is most sensitive to pier deformation, followed successively by bearing and fastener deformation.

Study on the restoring force model for the high‑speed railway CRTS III Slab Ballastless Track

Liu Lili, Jiang Lizhong, Zhou Wangbao, Yu Jian, Peng Kang, Zuo Yongjian

Archives of Civil and Mechanical Engineering

2022

Vol. 22, no. 3

art. no. e148

The China Railway Track System III (CRTS III) Slab Ballastless Track (SBT) is currently one of China's most widely used track structures. The elastic-plastic restoring force hysteresis model of CRTS III SBT is the primary problem that should be solved for the elastic-plastic seismic response analysis of high-speed railway (HSR) CRTS III SBT systems. To study the elastic-plastic restoring force hysteretic model of CRTS III SBT, four CRTS III SBT specimens were designed in this study and subjected to low-cycle reciprocating load tests. The efects of different thickness of rubber pad on the hysteretic curve, skeleton curve, and other performance of CRTS III SBT specimens were determined. In addition, the restoring force characteristics and hysteretic trends of CRTS III SBT specimens were ascertained. Furthermore, a load-displacement restoring force model for CRTS III SBT was built. Its results were compared with the test results, thus validating the load-displacement restoring force model rationality. The load-displacement restoring force model developed in this study is simple to calculate, laying a solid foundation for analyzing the elastic-plastic seismic responses of HSR CRTS III SBT systems.