圆钢管混凝土悬臂长柱压弯构件抗震性能研究  

Research on seismic behavior of beam-column members of long cantilever concrete-filled circular steel tubes

作　　者：杨俊芬[1] 胡盼盼[1] 闫西峰 张广平 奚增红 

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]中国能源建设集团甘肃省电力设计院有限公司,甘肃兰州730050

出　　处：《建筑结构学报》2016年第11期121-129,共9页Journal of Building Structures

基　　金：陕西省自然科学基础研究基金面上项目(2014JM7244);住房和城乡建设部2014年科学技术项目(2014K2-011);国家电网公司2014年依托工程基建新技术研究项目([2014]9)

摘　　要：对2个圆钢管混凝土悬臂长柱压弯试件和1个钢管柱对比试件进行了低周反复加载试验,研究了轴压力和钢管内填混凝土对试件抗震性能的影响,得到了试件的荷载-位移滞回曲线、骨架曲线等抗震性能指标,分析了试件的破坏形态、刚度退化以及耗能能力。结果表明:各试件的破坏形态为底部管壁鼓曲,底部一定范围内混凝土出现裂缝;与钢管柱压弯试件相比,钢管混凝土柱压弯试件的屈服承载力和刚度均增大,具有更好的抗震性能;随着轴压力的增大,钢管混凝土柱压弯试件的屈服荷载和刚度均有所减小,抗震性能降低。基于试验数据,采用有限元软件ABAQUS进行分析,分析结果与试验结果吻合较好。在此基础上,利用该数值方法对圆钢管混凝土悬臂长柱进行参数分析,分析结果表明,轴压比和含钢率对圆钢管混凝土柱压弯试件的屈服荷载、水平荷载、耗能能力以及刚度退化均有明显的影响,而混凝土强度等级和钢材强度对其影响较小。Two low cyclic loading tests on beam-column members of long cantilever concrete-filled circular steel tubes were carried out to contrast with the test result of steel tube. The effects of the axial compression ratios and the existence of concrete on structural seismic behavior were studied. And the load-displacement hysteretic loops, skeleton curves and other seismic behavior indicators were obtained. The failure characteristic, rigidity degradation and energy dissipation of these specimens were analyzed. The experimental results show that the failure modes of these specimens are the buckling of bottom walls, and cracks in concrete. Compared with compressive-flexural member of long cantilever circular steel tube, the yield capacity and rigidity of compressive-flexural member of long cantilever concrete-filled circular steel tube are increased, resulting in better hysteretic behavior. When the axial compression ratio increased, the yield capacity and rigidity of these specimens are decreased and the hysteretic behavior is lowered. Based on original test data, the finite element analysis by software-ABAQUS was conducted and the calculation results agree well with experimental results. Then parametric analysis using the proposed method was carried out to further study long cantilever concrete-filled circular steel tubes. The analysis results indicate that the yield capacity, the horizontal load, the energy-dissipating capacity and the rigidity degeneration can be obviously affected by the axial compression ratio and the steel ratio, while less affected by the strength grades of concrete and steel.

关 键 词：圆钢管混凝土 悬臂长柱 压弯构件 低周反复荷载试验 有限元分析 抗震性能 

分 类 号：TU398.903[建筑科学—结构工程]