混凝土框架楼梯设置滑动支座的结构模型振动台试验研究  

Shaking table test on structural model of concrete frame-staircase with sliding supports

作　　者：赵均[1] 侯鹏程[1] 刘敏 涂军[1] 高志强 彭凌云[1] 

机构地区：[1]北京工业大学工程抗震与结构诊治北京市重点实验室,北京100124 [2]中国建筑标准设计研究院,北京100082

出　　处：《建筑结构学报》2014年第3期53-59,共7页Journal of Building Structures

基　　金：北京市教育委员会科技计划重点项目(KZ201010005007);国家自然科学基金青年科学基金面上项目(51008010)

摘　　要：我国现行建筑抗震设计规范及标准设计图集对现浇钢筋混凝土板式楼梯提出了增设滑动支座的构造措施,为检验其有效性,以设置聚四氟乙烯板构成的滑动支座的混凝土框架楼梯间结构单元为对象,对缩尺比例为1∶3的模型结构进行了振动台试验,通过输入不同的地震波,考察其遭遇不同烈度水准地震作用下的抗震性能。试验结果表明:梯段板下端设置滑动支座的楼梯间结构单元具有良好的抗震性能,破坏主要集中在楼梯间的框架梁柱中,在强震作用下,楼梯构件(包括梯段板、平台板、梯梁和梯柱)本身未发生先于框架梁柱的破坏;聚四氟乙烯板构成的滑动支座作用很有效,梯段板下端沿输入动方向发生了期望的水平滑动位移;同时,此处也伴随出现值得注意的竖向翘起和落下的现象。A new measure, in which sliding supports are used between the staircases and the main structure, is proposed in the current code for seismic design of buildings. To experimentally verify the new measure, the shaking table test of a large scaled structural unit of concrete （PTFE） plate was conducted to dynamically test its frame-staircase with sliding supports made of ploytetrafluoroethene performance under input motions of different intensities. It shows that, with the sliding supports at the lower end of the stairway slabs, the seismic behavior of the structural unit of concrete frame-staircase is satisfactory; even subjected to very severe motions, serious damages happen mainly in the members of concrete frame and no serious failure occurs earlier than the frame in the staircase parts, including stairway slabs, platform, supporting beams and columns; the sliding support made of PTFE plate works effectively and, horizontally along the direction of the input motions, the lower ends of the stairway slabs can slide back and forth as expected; meanwhile, they also have repeated up and down movements there.

关 键 词：混凝土框架 楼梯 滑动支座 振动台试验 抗震性能 

分 类 号：TU375.4[建筑科学—结构工程] TU317.1