劲化方形截面钢管混凝土短柱轴压试验研究  

Experimental study on axial compression behavior of stiffened square section CFST short columns

作　　者：蔡健[1] 郑新志[2] 陈庆军[1] 左志亮[2] 杨春[1] 郑锦鸿[2] 

机构地区：[1]华南理工大学亚热带建筑科学国家重点实验室,广东广州510640 [2]华南理工大学土木与交通学院,广东广州510640

出　　处：《建筑结构学报》2014年第3期178-185,共8页Journal of Building Structures

基　　金：亚热带建筑科学国家重点实验室资助项目(X2TJ-C709025z;2011ZC25;2011ZC28;2013ZC14;2013ZC20)

摘　　要：采用劲化方形截面钢管混凝土柱可以有效地提高柱钢管壁的侧向刚度,增强其抵抗局部屈曲的能力和改善对核心混凝土的约束作用。通过普通方形截面钢管混凝土柱和劲化方形截面钢管混凝土短柱的轴压试验,对柱的轴压破坏形态、轴力-变形特征、钢管应变等进行了分析。结果表明:劲化带的设置使钢管壁对核心混凝土的约束作用更趋均匀,改变了钢管的局部屈曲变形状态,明显提高了方形截面钢管混凝土柱的轴压承载力和变形能力。根据劲化方形截面钢管混凝土短柱的受力分析,提出了轴压承载力计算式,计算结果和试验结果吻合良好。By setting stiffening belts, the lateral stiffness of the steel tube of square section CFST columns is effectively improved, the resistance capacity of the local buckling of the steel tube is enhanced, and then the bearing capacity and the ductility of the columns are improved. The axial compression experiments of the ordinary square section and the stiffened square section CFST short columns were carried out. The characteristics of the failure, deformation, bearing capacity, strain of the steel tube of the columns were analyzed. The experimental results show that by setting the stiffening belts the confinement effects of the steel tube to core concrete become stronger and more uniform and the local buckling mode of the steel tube are changed. The axial compression bearing capacity the columns are significantly increased. The calculating method is put forward for the capacity according to the mechanical analysis of the stiffened section square CFST short results are in good agreement with the experimental results. and deformation capacity of axial compression bearing columns. The calculating

关 键 词：方形截面钢管混凝土柱 约束拉杆 劲化带 轴压试验 轴压承载力 变形能力 

分 类 号：TU398.9[建筑科学—结构工程] TU317.1