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轨道约束对高铁大跨连续梁桥地震反应的影响

ISSN号：1006-2106
期刊名称：《铁道工程学报》
时间：0
分类：U442.5[建筑科学—桥梁与隧道工程;交通运输工程—道路与铁道工程]
作者机构：[1]兰州交通大学甘肃省道路桥梁与地下工程重点实验室,兰州730070, [2]兰州交通大学,兰州730070
相关基金：国家自然科学基金资助项目（51468031,51368034）;长江学者和创新团队发展计划资助（IRT1139）;甘肃省高等学校基本科研业务费项目（213051）

关键词：高速铁路, 连续梁桥, 地震反应, 线桥一体化模型, 轨道约束, high - speed railway , continuous girder bridge , seismic response , rail - bridge model , track system restraint

中文摘要：

研究目的：针对CRTSⅡ型板式无砟轨道体系的结构特点，以京沪高速铁路某大跨度连续梁桥为研究对象，采用线桥一体化模型讨论轨道体系对桥梁动力特性及地震反应的影响。研究结论：（1）轨道约束体系可增强相邻桥跨间的纵向联系，使按传统模型分析得到的两个单独振动单元变为一个整体振动单元，随着简支梁跨数的减少，连续梁桥的纵向一阶自振周期逐渐减小；（2）采用线桥一体化模型计算的连续梁桥地震反应大于传统模型，且随着简支梁跨数的增加，地震反应增大明显，不考虑轨道体系的纵向约束效应时，连续梁桥的地震反应偏于不安全；（3）随着轨道系统伸缩刚度的降低，线桥一体化模型的计算结果越来越接近传统模型；（4）随着端刺刚度的增加，连续梁桥的地震反应逐渐减小，但当端刺刚度大于一定值时，对连续梁桥的地震反应几乎无影响；（5）该研究结果可为多遇地震下高速铁路桥梁抗震计算模型的修订提供依据。

英文摘要：

Research purposes： According to structural characteristics of the CRTS Ⅱ slab ballastless track system, taking a long - span continuous girder bridge on the Beijing - Shanghai high - speed railway as research object, the influence of track system on dynamic characteristics and seismic response of the bridge is discussed based on the rail - bridge model. Research conclusions：（ 1 ） The track constraint system enhances longitudinal connection between adjacent bridges, two separate vibration unit obtained by traditional model analysis get into a whole vibration unit. With the decrease in number of simply - supported girder, longitudinal natural vibration period of the continuous girder bridge decreases. （2） For the continuous girder bridge, seismic response analyzed by the rail - bridge model is greater than that of the traditional model. With the increase in the number of simply - supported girder, seismic response increases significantly. No considering longitudinal stiffness of track constraint system, seismic response of the continuous girder bridge will is apt to be unsafe. （3） With the decrease of axial stiffness of track system, calculation results by using the rail - bridge model is more and more close to that of the traditional model. （4） With the increase of axial stiffness of end spine, seismic response of the continuous girder bridge gradually reduces. But when the end spine stiffness is greater than a certain value, seismic response of continuous girder bridge is almost no change. （5） The research result may provide a basis for revision of computational models of the high - speed railway bridge under frequent earthquake.

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