罕遇地震作用下高速铁路简支梁桥抗震性能分析

发布时间：2018-01-18 02:01

本文关键词：罕遇地震作用下高速铁路简支梁桥抗震性能分析　出处：《铁道标准设计》2015年08期 　论文类型：期刊论文

【摘要】：简支梁桥在高速铁路中占到了极高的比例,其抗震性能值得深入研究。结合西部高速铁路中典型的简支梁桥结构形式,建立不同墩高的高速铁路多跨简支梁桥的全桥空间分析模型,在模型中采用纤维单元模拟桥墩,并对固定支座锚固螺栓在罕遇地震作用下可能被剪断的力学特性予以适当的模拟,采用非线性时程方法分析高烈度地震区内该类桥梁在罕遇地震作用下的弹塑性地震响应,讨论该桥的损伤模式。分析结果表明:相比纵桥向地震作用,墩高20 m以内的高速铁路大跨度简支梁桥在横桥向地震作用下的桥墩损伤程度更大;整体看来桥墩具有较好的抗震性能,而合理控制支座锚固螺栓被剪断后主梁所产生的较大位移将成为铁路简支梁桥抗震设计中的重点。
[Abstract]:Simply supported beam bridge accounts for a high proportion of high-speed railway, its seismic performance is worth further study, combined with the typical simple beam bridge structure form in the western high-speed railway. The spatial analysis model of multi-span simply supported beam bridge of high-speed railway with different piers is established, and the fiber element is used to simulate the pier in the model. The mechanical characteristics of anchoring bolt of fixed support may be shearing under rare earthquake are simulated properly. The nonlinear time-history method is used to analyze the elastoplastic seismic response of this kind of bridge in high intensity earthquake region under rare earthquake, and the damage mode of the bridge is discussed. The results show that compared with the longitudinal bridge, the seismic response of the bridge is similar to that of the longitudinal bridge. Large span simply supported beam bridge of high-speed railway with pier height less than 20 m has greater damage degree under transverse earthquake. As a whole, the pier has better seismic performance, and the reasonable control of the displacement of the main beam caused by the shearing of the anchor bolt will become the key point in the seismic design of the railway simply supported beam bridge.
【作者单位】：中铁第一勘察设计院集团有限公司;同济大学桥梁工程系;
【基金】：西部地区博士后人才资助计划(2014M562526XB) 国家重点基础研究发展计划(2013CB036302) 国家科技支撑计划(2009BAG15B01)
【分类号】：U442.55
【正文快照】： 高速铁路(客运专线)在建设中大量采用了“以桥代路”,据统计桥梁比例已达到高速铁路线路总长度的70%~80%以上,而其中绝大部分都是简支箱梁桥[1]。因此,高速铁路桥梁抗震设计应重点研究解决简支箱梁桥所存在的问题。高速铁路桥梁为了满足列车在高速运行中的安全性和舒适度指标,

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