温度⁃地震耦合作用下高速铁路桥上无砟轨道动力性能

doi:10.13229/j.cnki.jdxbgxb.20250387

摘要/Abstract

摘要：

为探究我国西北大温差地区高速铁路多跨简支梁桥上无砟轨道的地震响应特性，以某10跨CRTS Ⅲ型板式无砟轨道简支梁桥为研究对象，建立线桥一体化有限元模型，采用动力时程分析法系统研究环境温度-地震耦合作用下桥上无砟轨道各部件及其层间连接的地震响应规律。研究结果表明：①在地震强度PGA≤0.2g（g=9.81 m/s2）且温度-30~40 ℃工况下，钢轨纵向应力始终处于安全范围，且相同地震作用下低温环境对钢轨纵向应力的影响显著高于高温环境；②相较于小震作用，结构位移响应对环境温度变化更为敏感，其中高温环境会显著增大各结构纵向位移，而低温环境则使钢轨竖向位移增幅更为明显；③在温度与地震耦合场下，钢轨与轨道板层间纵向变形极值均出现在边跨，但随温度变化呈现显著空间差异：低温（-50 ℃）时第一跨变形较常温增大131.83%，而高温（50 ℃）时第十跨变形增幅达137.54%；④在中小震作用下，-20 ℃环境温度时轨道结构表现出最优抗震性能，各响应参数均维持在较低水平。

关键词: 西北大温差地区, 高速铁路简支梁桥, CRTS Ⅲ型板式无砟轨道, 线桥耦合振动, 温度?地震耦合作用, 地震响应分析

Abstract:

To investigate the seismic response characteristics of ballastless tracks on multi-span simply supported bridges in high-speed railways located in large-temperature-difference regions of Northwest China， this study takes a 10-span simply supported bridge with CRTS Ⅲ slab ballastless track as the research object. An integrated track-bridge finite element model is established， and dynamic time-history analysis is employed to systematically examine the seismic response patterns of track components and interlayer connections under coupled environmental temperature and seismic effects. The results indicate that： ① Under seismic conditions with PGA≤0.2g（g=9.81 m/s2） and temperatures ranging from -30℃ to 40℃， the longitudinal stress of the rail remains within a safe range， with low-temperature conditions exerting a more pronounced influence than high temperatures under the same seismic intensity. ② Compared to minor earthquakes， structural displacement responses are more sensitive to temperature variations—high temperatures significantly increase longitudinal displacements， while low temperatures lead to a more notable rise in rail vertical displacements. ③ Under coupled temperature-seismic effects， the peak longitudinal deformation between the rail and track slab occurs at the end spans， yet exhibits significant spatial variation with temperature： at -50 ℃， deformation in the first span increases by 131.83% compared to normal temperature， whereas at 50 ℃， the tenth span experiences a 137.54% increase. ④ Under minor-to-moderate earthquakes， the track structure demonstrates optimal seismic performance at -20 ℃， with all response parameters maintained at relatively low levels.

Key words: northwest large temperature difference region, high-speed railway simply supported girder bridge, CRTS Ⅲ type slab ballast track, wire-bridge coupled vibration, temperature-seismic coupling, seismic response analysis

中图分类号:

刘尊稳,牟金龙,陈兴冲,韩国庆,李欣婧,宋宏. 温度⁃地震耦合作用下高速铁路桥上无砟轨道动力性能[J]. 吉林大学学报(工学版), 2026, 56(10): 2635-2647.

Zun-wen LIU,Jin-long MOU,Xing-chong CHEN,Guo-qing HAN,Xin-jing LI,Hong SONG. Seismic-thermal coupling effects on dynamic behavior of high-speed railway ballastless track on bridges[J]. Journal of Jilin University(Engineering and Technology Edition), 2026, 56(10): 2635-2647.

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本文编号	地震记录名称	记录时间	测站
TR1	Hector Mine	1999.10.16	Snow Creek
TR2	Hector Mine	1999.10.16	Twentynine Palms
TR3	Chi?Chi Taiwan?03	1999.9.20	HWA020
TR4	Chi?Chi Taiwan?03	1999.9.20	TTN040
TR5	Chi?Chi Taiwan?03	1999.9.20	TTN051
TR6	Irpinia Italy?02	1980.11.23	Rionero In Vulture
TR7	Loma Prieta	1989.10.18	Hollister?SGO Vault