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。
The sliding of rubber bearings （ RB ） was a common phenomenon under seismic e x c ita t io n , which cau se s series of chain reaction , consisting of la rge r displacement of g i rd e r, coll ision among g ird e r s, and even girder fa l l in g . he sliding problem of RB was studied through experiments in this p a p e r. The results show that ： R B of typ ica l highway ridges will slide less than the seismic load of fortification in tens ity. It is difficult to meet the requirements of 4 Guideline or Seismic Design of Highway Br idges,, which pre scr ibe s that R B is not allowed to s lide under earthquake action. The pper surface of RB will s lide e a r l ie r than the lower sur face and the s liding frequency and extend are also greater for the pper surface. The sliding of RB has a certain isolation e f fe c t, which can e f fe ctiv e ly reduce the seismic response of the ridge. However, the isolation effect is un stab le. The bearing lock -pre s su re cau sed by the large deformation of the lower art of the structure wi l l prevent further expansion of the sliding d isp la c em en t, which indirectly pla y a role in preventing he girder falling . The uneven pressures among the bearings w i l l c au se a lo ca l la rge r stress of some p ie r s , which may lead o an earlier failure of piers during e a rth qu ake.
作者
王凯睿
徐秀丽
李雪红
李枝军
田国伟
刘伟庆
WANG Kairui XU Xiuli LI Xuehong LI Zhijun TIAN Guowei LIU Weiqing(Depar tment of Civi l Engineer ing, Nanj ing Tech Universi ty, Nanj ing 210009, China)
出处
《振动与冲击》
EI
CSCD
北大核心
2017年第12期68-74,共7页
Journal of Vibration and Shock
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)
关键词
桥梁
振动台试验
板式橡胶支座
滑动
隔震
bridge
shaking table t e s t
rubber b e a r in g
s l id e
isolation
