高速铁路多跨简支梁桥纵向地震力分布规律

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摘要 研究目的: 为研究CRTSⅡ型板式无砟轨道系统对支座及端刺结构纵向地震力的影响,以多跨32 m高速铁路简支梁桥为研究对象,分别建立线桥一体化模型与传统模型,通过调整墩高及跨数,研究考虑轨道约束时纵向地震力在桥墩支座间的分布规律。通过探讨墩顶支座、台顶支座地震力和端刺纵向地震力这三个量值间的关系,进而分析纵向地震力在整个桥梁体系中的分布规律。
研究结论: (1)考虑轨道体系纵向约束效应,多跨简支梁桥的固定支座纵向地震力呈边界处小、中跨大的抛物线形分布,而传统模型呈直线形分布;支座纵向地震力存在明显的反应放大区域,该区域位于桥梁中间跨附近,区域范围与墩高及跨数有关;(2)放大区域系数随跨数增加而增加,随墩高增加而减小,当跨数为50跨时,处在中间跨附近区域的支座纵向地震力相比于传统模型计算值,增加约20%;(3)支座纵向地震力分布规律与轨道体系对结构自振周期的影响以及边界效应影响范围双重作用有关;(4)本研究成果可应用于地势平缓、全桥墩高接近的高速铁路简支梁桥的抗震设计。

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	张永亮
	王春阳
	刘正楠
	朱海龙
	季翔

关键词 ：高速铁路, 简支梁, 线桥一体化模型, 支座, 纵向地震力, 边界效应

Abstract：Research purposes: In order to study the influence of CRTSⅡ slab ballastless track system on the longitudinal seismic force of bearing and end-spine structure, integrated track and bridge model and conventional model are established respectively for the multi-span 32 m high-speed railway simply supported girder bridge. When considering the constraint of track system, the distribution law of the longitudinal seismic force in pier bearings is studied through adjusting pier height and span number. By discussing the relationships among the seismic force of pier bearings, abutment bearings and end spines, the distribution law of the longitudinal seismic force in the whole bridge structure is further analyzed.
Research conclusions: (1) Considering the effect of longitudinal constraint, the longitudinal seismic force of the fixed bearing for multi-span simply supported girder bridge presents a parabolic distribution that is small at the boundary and large in the middle span, while the longitudinal seismic force of the fixed bearing in the conventional model is distributed in a straight line. The bearing has an obvious region where the seismic response has been amplified, and the area, located near the middle span of the bridge, is related to the pier height and span number. (2) The amplification area coefficient increases with the increase of span number and decreases with the increase of pier height. When the span number is 50, the longitudinal seismic force of the bearing near the middle span is about 20 percent larger than that in the conventional model. (3) The distribution law of longitudinal seismic force of bearing relates to a dual effect incorporating the impact of track system on natural vibration period and the influence scope of boundary effect. (4) The research conclusions could be applied to the seismic design of simply supported girder bridge with gentle terrain and approximately equal height for all piers, which goes for high-speed railway.

Key words： high-speed railway simply supported girder integrated track and bridge model bearing longitudinal seismic force boundary effect

收稿日期: 2021-09-22

PACS:

U24

基金资助:国家自然科学基金资助项目(52168018);兰州交通大学“百名青年优秀人才培养计划”(15202202007)

作者简介: ^**张永亮,1975年出生,男,教授,博士生导师。

引用本文:

张永亮, 王春阳, 刘正楠, 朱海龙, 季翔. 高速铁路多跨简支梁桥纵向地震力分布规律[J]. 铁道工程学报, 2022, 39(7): 55-60.
ZHANG Yongliang, WANG Chunyang, LIU Zhengnan, ZHU Hailong, JI Xiang. Distribution Law of Longitudinal Seismic Force for Multi-span Simply Supported Girder Bridge of High-speed Railway. Journal of Railway Engineering Society, 2022, 39(7): 55-60.

链接本文:

https://tdgcxb.crec.cn/CN/ 或 https://tdgcxb.crec.cn/CN/Y2022/V39/I7/55

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