设分配梁与内环板传力构造的巨型钢管混凝土柱抗震性能试验研究  

Experiment study on seismic performance of giant CFT columns with distributive beam and inner diaphragms as load-transfer detailing

作　　者：罗金辉[1] 李元齐[1] 张元植[1,2] 傅学怡 沈祖炎[1] Luo Jinhui1 Li Yuanqi1 Zhang Yuanzhi1,2 Fu Xueyi1,3 Shen Zuyan1(1. Tongji University, Shanghai 200092, China; 2. Sichuan Institute of Building Research, Chengdu 610081, China; 3. CCDI （Shenzhen）, Shenzhen 518048, China)

机构地区：[1]同济大学,上海200092 [2]四川省建筑科学研究院,四川成都610081 [3]悉地国际设计顾问(深圳)有限公司,深圳518048

出　　处：《土木工程学报》2018年第4期34-44,共11页China Civil Engineering Journal

基　　金：国家自然科学基金(51208375)

摘　　要：针对7个按1∶5缩尺的设置分配梁加内环板传力构造的巨型钢管混凝土柱试件进行拟静力试验研究,考察了轴压比、长细比、管壁宽厚比及纵向T形加劲肋等因素对此类构件抗震新能的影响。研究结果表明,管壁宽厚比大于60的试件,在达到极限荷载之前(约为极限荷载的63%)发生管壁局部屈曲,延性较差;设置T形加劲肋可有效减小管壁宽厚比,提高管壁局部屈曲强度,改善试件的延性性能及耗能能力;试件位移延性系数随轴压比和试件长细比的增大而降低,刚度退化越明显;在低周反复荷载作用下,同时设置分配梁与内环板传力构造的钢管混凝土柱试件破坏时的位移角超过了规范规定的弹塑性层间位移角限值,满足抗震设计要求,且钢管与核心混凝土变形协调,相应的截面属性和压弯承载力可按平截面假定计算。Pseudo-static tests of seven 1/5 scaled models for giant CFT column with distributive beam and inner diaphragms as the load-transfer detailing were conducted. Influence of axial compression ratio, slenderness ratio, width- to-thickness ratio of steel tube as well as the T-shaped stiffeners on the seismic performance of the giant CFT columns was investigated. Experimental results indicated that specimen with width-to-thickness of tube larger than 60 appeared local buckling on the steel tube when the lateral load on the top of columns increased to about 63% of the peak load and resulted in bad ductility. However, for those specimens with width-to-thickness larger than 60 but T-shaped longitudinal stiffeners welded on the steel tube, local buckling capacity of the tube, ductility behavior as well as dissipation of the columns were improved effectively. It could also be concluded that ductility index of specimens decrease and stiffness degradation of the columns become more and more obvious with increase of the compression or slenderness. Meanwhile, requirement for seismic design could be satisfied since the story angle of specimens at the stage of distroty was larger than that from the relative seismic codes under low reversed cyclic load. Deformation between the steel tube and core concrete was observed to be coordinated by analyzing corresponding value of strain gauge on specimens with distributive beam and inner diaphragm as the load-transfer detailing. Therefore, the plane-section assumption can be used to calculate the bearing capacity and section properties of such columns.

关 键 词：巨型钢管混凝土柱 传力构造 缩尺模型试验 抗震性能 T形加劲肋 

分 类 号：TU392.1[建筑科学—结构工程] TU317.1