考虑板式支座滑动效应的桥梁振动台试验研究

发布时间：2018-03-31 05:36

本文选题：桥梁　切入点：振动台试验　出处：《振动与冲击》2017年12期

【摘要】：在地震作用中,板式橡胶支座的滑动现象普遍存在,并可能导致梁体移位过大、梁体碰撞甚至落梁等一系列的连锁反应。通过试验对板式橡胶支座的滑动问题进行了研究;试验结果表明:高速公路典型桥梁中板式橡胶支座在还未达到设防地震作用就会发生滑动,很难满足《公路桥梁抗震设计细则》中规定的板式橡胶支座在地震作用下不允许发生滑动的要求;板式橡胶支座上表面先与下表面发生滑动,并且支座上表面滑动也更为频繁、尺度也更大;板式橡胶支座的滑动具有一定的隔震作用,可有效减小桥梁结构的地震反应,但这种隔震作用极不稳定;下部结构的大变形会使支座发生卡压,阻止其滑动位移的进一步扩大,间接发挥了防落梁作用。试验中板式橡胶支座间存在不均匀受压,导致部分桥墩受力过大而提前失效。
[Abstract]:During the earthquake action, the sliding phenomenon of the plate rubber bearing exists generally, which may lead to a series of chain reactions, such as the excessive displacement of the beam body, the collision of the beam body and even the falling beam, etc. The sliding problem of the plate rubber bearing is studied through experiments. The test results show that the plate rubber bearing in the typical expressway bridge will slip before the earthquake prevention effect is reached. It is very difficult to meet the requirement that the plate rubber bearing is not allowed to slide under earthquake action as stipulated in the detailed rules for Seismic Design of Highway Bridges. The upper surface of the plate rubber bearing slips with the lower surface first, and the upper surface of the support slides more frequently. The sliding of the plate rubber bearing has a certain isolation effect, which can effectively reduce the seismic response of the bridge structure, but this isolation action is extremely unstable, and the large deformation of the substructure will cause the bearing to be jammed. Preventing the further expansion of the sliding displacement indirectly exerts the function of preventing the falling beam. In the test there is uneven compression between the plate rubber bearings which results in the partial bridge pier bearing too much force and failure ahead of time.
【作者单位】：南京工业大学土木工程学院;
【基金】：国家自然科学基金资助项目(51178220) 江苏省交通运输科技项目(2013Y12) 江苏省科技支撑计划(BE2014716)
【分类号】：U446.1

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