（山东科技大学山东省土木工程防灾减灾重点实验室， 青岛 266590）

［摘要］为了研究层间平台板处设置滑动支座的四梯柱RC框架结构楼梯间的抗震性能，设计了1/3缩尺模型并进行拟静力试验，分析了其裂缝开展、破坏机制、滞回曲线以及耗能能力等。试验结果表明：楼梯一端与框架分离避免了楼梯的“K”形支撑作用，提高了结构延性；在结构破坏方面，层间平台板发生约25mm幅度的掀起现象，但并未开裂，梯柱、梯板基本无破坏，试件表现出了良好的抗震安全性；破坏时框架柱柱底与梯柱柱底钢筋应变幅值分别为2382με和-139με，数值上相差达16倍，框架是试件耗能的主体，楼梯构件没有参与结构整体受力，试件屈服机制较为理想。

［关键词］框架结构； 防震楼梯； 拟静力试验； 抗震性能； 屈服机制

中图分类号：TU375-4文献标识码：A文章编号：1002-848X(2019)12-0079-04

Experimental research on seismic performance for aseismatic staircase of RC frame structure

Cong Shuping, Chen Jiaxue, Peng Min

（Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation, Shandong University of Science and Technology, Qingdao 266590, China）

Abstract:In order to study the seismic performance of the four-column RC frame staircase with sliding support at the intermediate platform board, the 1/3 scale model was designed and the pseudo\|static test was carried out to study its crack development, failure mechanism, hysteretic curve and energy dissipation capacity. Results indicate that separating the end of the stair from the frame avoids the “K” type support of the stair and improves the ductility of structure. In terms of structural damage, the intermediate platform board was lifted up 25mm but it did not crack, in addition, the ladder column and the ladder plate were basically free from damage. The specimen showed good performance of seismic safety. At the damage stage, the strain amplitude of frame column bottom and ladder column bottom is 2 382με and -139με respectively, while the two data values differ 16 times. The frame is the main part of the energy dissipation of the specimen, and the stair components do not participate in the overall lateral resistance process of the structure, and the yield mechanism of the specimen is ideal.

Keywords:frame structure; aseismatic staircase; pseudo-static test; seismic performance; yield mechanism

*青岛市建设事业科技发展项目（JK2014-10）。

作者简介：丛术平，博士，讲师，Email：congshp@163.com。