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

发布时间：2018-01-09 06:38

本文关键词：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　出处：《建筑结构学报》2014年03期 　论文类型：期刊论文

【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。
[Abstract]:In order to test its validity, the current code for seismic design of buildings and the standard design drawing set of our country have put forward the construction measures of adding sliding support to cast-in-place reinforced concrete slab staircase. Taking the structure unit of concrete frame staircase with sliding support of PTFE plate as the object, the shaking table test of the model structure with scale of 1: 3 was carried out, and different seismic waves were inputted. The experimental results show that the staircase structure unit with sliding support at the lower end of the ladder plate has good seismic performance. The damage is mainly concentrated in the frame Liang Zhu in the stairway. Under the action of strong earthquake, the damage of staircase members (including ladder plate, platform plate, ladder beam and column) does not occur prior to the frame Liang Zhu. The sliding support of PTFE plate is very effective, and the desired horizontal sliding displacement occurs in the lower end of the ladder plate along the input direction. At the same time, here also accompanied by noteworthy vertical rise and fall phenomenon.
【作者单位】：北京工业大学工程抗震与结构诊治北京市重点实验室;中国建筑标准设计研究院;
【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)
【分类号】：TU375.4;TU317.1
【正文快照】： 0引言楼梯是多层及高层建筑结构的重要组成部分,在地震作用下受力较为复杂。传统构造方式的混凝土楼梯,梯段板与主体结构整浇,相当于斜撑构件参与抗侧力,致使结构受力复杂,而其自身在强震作用下也往往先行破坏。以往震害,特别是2008年汶川地震震害调查表明[1-4],楼梯及其相关

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