高强箍筋高强混凝土柱的塑性铰长度  

PLASTIC HINGE LENGTH OF HIGH-STRENGTH CONCRETE COLUMNS CONFINED BY HIGH-STRENGTH STIRRUPS

作　　者：杨坤[1] 史庆轩[2] 赵均海[1] 

机构地区：[1]长安大学建筑工程学院,陕西西安710061 [2]西安建筑科技大学土木工程学院,陕西西安710055

出　　处：《工程力学》2013年第2期254-259,共6页Engineering Mechanics

基　　金：国家自然科学基金项目(51178380;50978215);教育部高等学校博士学科点专项科研基金项目(20116120110004);中央高校基本科研业务费专项资金项目(CHD2010JC120)

摘　　要：为了研究高强箍筋约束高强混凝土柱的抗震性能及其塑性铰长度的计算方法,进行了10根高强箍筋高强混凝土悬臂柱在高轴压比下的低周反复加载试验。结果表明:该类型柱在高轴压比下的滞回曲线仍呈稳定丰满的梭形,具有较好的延性性能,即密配高强箍筋是保证高强混凝土框架柱在高轴压比下具有良好延性性能以及提高其轴压比限值的有效措施。结合试验研究和理论分析,分别采用基于柱位移和曲率的方法、基于混凝土压应变的方法计算塑性铰长度并进行对比,两者计算结果相近,塑性铰长度平均值略大于柱截面边长。The motivation of this research is to study the seismic performance of HSC columns confined by high-strength stirrups and to study the methods of determining its plastic hinge length. A total of 10 high-strength concrete columns confined by high-strength complex stirrups were tested under a cyclic lateral force and a higher constant axial loading, and the results indicate that the hysteresis loop of this type of columns still shows a plump spindle-shape at a higher axial compression ratio with better ductility. Therefore, setting closed high-strength stirrups is an effective measure to ensure good ductility of HSC columns and enhance its axial compression ratio limits. Based on the experimental and analytical research, this paper presents two methods of calculating the plastic hinge length, and one is based on the displacement and curvature of columns and the other is based on concrete compression strain. By comparison, the calculation results of both the methods are similar and indicate that the average length of a plastic hinge is slightly larger than the side length of the column cross section.

关 键 词：高强箍筋 高强混凝土 约束混凝土 塑性铰长度 延性 

分 类 号：TU375.4[建筑科学—结构工程]