加芯混凝土框架柱轴压比限值试验研究  

Experimental research on limit value of axial compression ratio for concrete frame columns with central reinforcement

作　　者：郭军庆[1] 王雪韵[1] 雷自学[1] 周天华[1] 

机构地区：[1]长安大学建筑工程学院,陕西西安710061

出　　处：《建筑科学与工程学报》2005年第4期45-49,共5页Journal of Architecture and Civil Engineering

基　　金：教育部科学技术研究重点项目(03162);陕西省自然科学研究项目(2002E201);长安大学青年科技发展基金项目(Q0008009)

摘　　要：为了解决高层结构设计中因轴压比限值影响使混凝土框架柱经常出现“胖柱少筋”等相关问题,通过6个加芯混凝土框架柱试件的低周反复伪静力试验,考察了试件的受力特性及破坏特征,分析了影响加芯混凝土框架柱延性的主要因素,并对各试件的V-Δ滞回曲线、位移延性比、极限位移转角等试验结果进行了研究。试验结果表明:轴压比、体积配箍率和芯柱纵筋配筋率对混凝土框架柱的延性及弹塑性变形性能均有较大的影响;在高轴压比下,采用较大的体积配箍率和芯柱纵筋配筋率是保证加芯混凝土框架柱抗震延性的重要措施。最后提出了加芯混凝土框架柱轴压比限值的新建议值。In order to solve the problems frequently that the concrete frame columns are too fat and too lightly reinforced in the design of high-rise structures because of the limit values of axial compression ratio, through the test of six specimens of concrete frame column with central reinforcement under cyclic lateral loading, authors investigated the properties and failure pattern of specimens, analyzed the major factors affecting the ductility of concrete frame columns with central reinforcement, and studied the test results of each specimen, including V and A hysteresis curve, displacement ductility ratio, ultimate displacement rotation, etc. The test results show that axial compression ratio, volumetric tie ratio and longitudinal reinforcement ratio of central reinforcement are among the major factors affecting both the ductility and elastic-plastic behavior of concrete frame columns and that at a high level of axial compression ratio, large volumetric tie ratio and longitudinal reinforcement ratio are important measures to ensure good seismic ductility of concrete frame columns with central reinforcement. Finally, new limit values of axial compression ratio were recommended for concrete frame columns with central reinforcement.

关 键 词：加芯混凝土框架柱 试验研究 延性 轴压比限值 

分 类 号：TU973.15[建筑科学—结构工程]