大直径钢管混凝土柱抗震性能试验研究及承载力计算  

Experimental study on seismic behavior of CFST columns with large diameter and calculation of bearing capacities

作　　者：范重[1] 王倩倩 李振宝[2] 叶勇[3] 赵长军[1] 仕帅 裴雨晨[1] 赵薇 

机构地区：[1]中国建筑设计研究院,北京100044 [2]北京工业大学工程抗震与结构诊治北京市重点实验室,北京100022 [3]华侨大学土木工程学院,福建厦门361021 [4]阳光保险集团股份有限公司,北京100020

出　　处：《建筑结构学报》2017年第11期34-41,共8页Journal of Building Structures

基　　金：中国建设科技集团股份有限公司科技创新基金项目(Z2014J09)

摘　　要：为研究径厚比对大直径钢管混凝土柱抗震性能的影响,进行了2个直径600 mm圆钢管混凝土柱试件在恒定轴向压力和水平往复荷载作用下的加载试验,对比分析了不同径厚比(分别为37.5、50.0)试件的破坏形态、滞回特性、钢管应变发展规律以及核心配筋的受力情况。试验结果表明:大直径钢管混凝土柱在压弯荷载作用下,滞回曲线非常饱满,耗能性能优越,均表现出良好的变形能力。随着试件径厚比加大,最大位移角与等效阻尼比均略有减小。柱根部混凝土压溃、钢管鼓曲主要发生在支座底板与下部第一排栓钉之间,栓钉对管壁面外变形具有明显的约束作用;当径厚比较小时,钢管管壁对混凝土的约束作用较强,残余变形较小。核心纵向钢筋基本处于弹性状态,箍筋未屈服,对内部混凝土的约束作用较小,但钢筋与混凝土之间存在明显的滑移现象。大直径钢管混凝土压弯构件的受弯承载力试验值显著高于按照我国现行相关规范、规程公式得到的计算值,说明采用我国现行相关技术规范中的承载力计算公式进行大直径钢管混凝土柱设计,结果偏于安全。In order to study the effect of diameter-thickness ratio（ D/t） on seismic behavior of concrete filled steel tubular（ CFST） columns,two specimens with diameter 600 mm were tested under constant vertical loads and cyclic horizontal loads. The failure phenomenon,hysteretic curves,strains developing procedure on steel tubes and core reinforcement of the specimens with D/t of 37. 5 and 50 were analyzed. The test results show that,the hysteretic curves of CFST columns with large diameter are very full. The energy dissipation performance is superior. The deformation capacity is excellent. With the increase of D/t,the maximum deformation angle and the equivalent damping ratio of the specimens are slightly reduced. The concrete crushing and tube wall buckling occur mainly in the region between the bearing plate and the first row of studs which have a clear constraint effect on the tube wall of the specimens. When D/t is relatively small,the steel pipe wall has stronger constraint effect on the core concrete,and the residual deformation is smaller. The core longitudinal reinforcement is basically in the elastic state. The stirrups are far from the yield strain,even they have less constrain effect on concrete. But there is obvious slip between reinforcement and concrete. The bending bearing capacity of concrete filled steel tubular columns with large diameter in the test is significantly higher than calculation results according to the relevant specifications in China,which means the Chinese specification is conservative.

关 键 词：钢管混凝土柱 径厚比 拟静力试验 承载力 抗震性能 

分 类 号：TU973.14[建筑科学—结构工程] TU317.1