高强箍筋约束柱的延性及配箍特征值限值研究  

Research on Ductility and Limit Value of Stirrup Characteristic Value for Concrete Columns Confined by High-strength Stirrups

作　　者：蒋鑫[1,2] 张萍 陈晓磊[1,2] 傅剑平[1,2] 

机构地区：[1]山地城镇建设与新技术教育部重点实验室(重庆大学),400045 [2]重庆大学土木工程学院,400045 [3]中建三局成都公司,610041

出　　处：《特种结构》2017年第4期36-43,共8页Special Structures

基　　金：国家自然科学基金项目(51478063)

摘　　要：为研究在满足一定延性水平下高强箍筋约束柱加密区的最小配箍特征值要求,对比了中国混凝土结构设计规范与欧洲、美国以及新西兰规范关于约束箍筋强度限值、箍筋用量的规定,以及配箍特征值随轴压比变化的趋势。同时,利用国内外247根箍筋屈服强度在400MPa^1200MPa的钢筋混凝土柱的低周反复试验结果,分析了不同配箍特征值、不同轴压比与柱破坏时的延性关系;对比了柱试件延性结果与中国规范对柱加密区最小配箍特征值要求的关系。对比分析结果表明:中国规范柱加密区的箍筋配置要求在较高轴压比和高轴压比作用时偏低,有必要在轴压比较高的条件下适当上调配箍特征值。在此基础上,从满足延性要求的角度,提出了使用高强箍筋约束柱的设计建议。The purpose of this paper is to study the limit of stirrup characteristic value of concrete columns with high-strength stirrups under certain ductility demand. The strength limit of confining reinforcement, thea- mount of confining reinforcement and the trend of stirrup characteristic value changing with the axial compres- sion ratio were reviewed among the GB 50010 -2010（ China）, EN 1998 - 1： 2004（ Europe）, ACI 318 - 14 （America）, NZS 3101 -2006（ New Zealand）. Besides, the test results of 247 concrete columns under cyclic loading were collected to investigate the ductility of concrete columns affected by stirrup characteristic value and axial load ratio and discuss the comparison between the ductility of concrete columns and the limit of stir- rup characteristic value of concrete columns in the Chinese code. The yield strength of stirrups of the 247 col- umns ranged from 400 to 1200MPa. The results indicated that the amount of confining reinforcement of con- crete columns in the Chinese code needs to be increased under the relatively high axial load ratio. Thus, based on the ductility demand, design suggestions for the concrete columns with high-strength stirrups are pro- posed in this paper.

关 键 词：高强箍筋 约束混凝土柱 配箍特征值 延性 

分 类 号：TU37[建筑科学—结构工程]