Experiment study on seismic performance of giant CFT columns with distributive beam and inner diaphragms as load-transfer detailing
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
Abstract：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.
罗金辉 李元齐 张元植 傅学怡 沈祖炎 . 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[J]. 土木工程学报, 2018, 51(4): 34-44.
Luo Jinhui Li Yuanqi Zhang Yuanzhi Fu Xueyi Shen Zuyan. Experiment study on seismic performance of giant CFT columns with distributive beam and inner diaphragms as load-transfer detailing. 土木工程学报, 2018, 51(4): 34-44.
