大尺寸薄壁钢筋混凝土管柱抗震性能试验研究  

EXPERIMENTAL STUDY ON SEISMIC BEHAVIOR OF REINFORCED CONCRETE PIPE COLUMNS WITH A LARGE CROSS SECTION SIZE AND THINNED WALL

作　　者：朱丽华[1] 白国良[1] 李晓文[1] 荣哲[1] 涂锋[1] 

机构地区：[1]西安建筑科技大学土木工程学院,西安710055

出　　处：《工程力学》2009年第3期134-139,共6页Engineering Mechanics

基　　金：国家自然科学基金项目(50778150);陕西省科技攻关项目(2006K07-G24);西安建筑科技大学博士创新基金项目

摘　　要：通过4个1/8比例试件的低周反复加载试验,研究轴压比、壁径比与配筋率对大尺寸薄壁钢筋混凝土管柱抗震性能的影响。分析了试件的滞回曲线、骨架曲线及其特征点、位移延性以及破坏模式。按照现行混凝土结构设计规范计算了试件的弯曲承载力,试验结果大于计算结果。建议了配置双排纵筋钢筋混凝土管柱的抗弯承载力计算公式。采用ANSYS进行有限元计算,计算结果与试验结果基本吻合。研究表明:弯曲破坏是大尺寸薄壁钢筋混凝土管柱的主要破坏模式,轴压比是影响其延性的主要因素。Four 1/8 scale specimens are tested under the low-reversed cyclic loading to investigate the seismic behavior of reinforced concrete pipe columns with a large cross section size and thinned wall. The influenencing factors including the axial compression ratio, the thickness to diameter ratio and the reinforcement ratio are analyzed and assessed. The hysteretic curves, skeleton curves and their characteristic values, the displacement ductilities and failure modes are analyzed. The formula prescribed by Code for design of concrete structures （GB50010-2002） is employed to calculate the flexure bearing capacity of the specimens, showing that the current code tends to underestimate the flexure bearing capacity. To improve the calculation accuracy, a formula for calculating the flexure bearing capacity of reinforced concrete pipe columns with double-row longitudinal bars is suggested. Finally, a FEM analysis by using ANSYS is performed, and good agreement with the test results is observed. This study also shows the common failure mode of reinforced concrete pipe columns with a large cross section size and thinned wall is bending failure, and axial compression ratio has great influence on the ductility of the pipe columns.

关 键 词：钢筋混凝土管柱 抗震性能 低周反复加载 延性 抗弯承载力 

分 类 号：TU375.3[建筑科学—结构工程]