碰撞刚度与间隙对大跨减隔震铁路连续梁桥防落梁设计的影响分析

发布时间：2018-01-20 02:33

本文关键词： 大跨桥梁防落梁设计减隔震碰撞间隙　出处：《地震工程与工程振动》2014年S1期 　论文类型：期刊论文

【摘要】：传统的桥梁防落梁装置设计采用规范规定按照构造措施进行处理,多由设计人员凭经验设计,设计不当往往容易导致梁体局部损坏甚至落梁事故的发生。当前越来越多的大跨重要性桥梁采用了减隔震技术进行设计,然而规范并没有对该类桥梁的防落梁装置设计给出相关规定,给防落梁装置的设计造成了一定的困难。本文以一联四跨铁路连续梁桥的防落梁装置设计过程为例,采用非线性时程分析法,分析了碰撞刚度、纵、横向间隙大小对撞击力及防落梁设计的影响规律。最后本文提出了强震下某大跨连续梁桥防落梁设计的原则,计算结果可为大跨减隔震桥梁防落梁的设计提供参考。
[Abstract]:The design of the traditional bridge anti-falling beam device is handled according to the construction measures according to the specification, and is designed by the designer based on the experience. Improper design often leads to the local damage of beam and even the accident of falling beam. At present, more and more long-span important bridges are designed by seismic isolation technology. However, the code does not provide the relevant regulations for the design of the anti-falling beam device of this kind of bridge. This paper takes the design process of a four-span railway continuous beam bridge as an example, uses nonlinear time-history analysis method to analyze the impact stiffness and longitudinal. The influence of transverse clearance on the design of impact force and anti-falling beam is studied. Finally, the principle of anti-falling beam design for a long-span continuous beam bridge under strong earthquake is proposed. The results can be used as reference for the design of anti-falling beam of long span seismic isolation bridge.
【作者单位】：中铁第一勘察设计院集团有限公司;
【基金】：中国铁路总公司科技研究开发计划课题(2013G002-B) 中铁第一勘察设计院科研项目(院科:12-25)
【分类号】：U442.5
【正文快照】： 引言早期由于桥梁抗震设计经验方面的不足,设计者通常低估了桥墩与上部梁体之间的相对位移,导致大震时墩梁之间产生大位移,引起落梁震害的发生。这类震害现象对上部结构的破坏是致命的,导致交通直接中断,并且对后续的抗震救灾通道的打开影响甚大。由此桥梁工作者在这方面进行

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