【摘要】 为解决转换结构抗震性能差的问题,提出带耗能腋撑钢管混凝土柱-型钢混凝土梁新型转换结构形式。对一榀1∶4普通型钢混凝土框架转换结构和带耗能腋撑型钢混凝土框架转换结构进行拟静力试验。从试件破坏形态、荷载-位移曲线、塑性铰发展、应变发展和耗能能力等方面研究带耗能腋撑型钢混凝土转换结构的抗震性能。试验结果表明:耗能腋撑有效控制了节点区梁、柱端塑性铰的发展,使塑性铰向转换梁加腋处转移;腋撑附加轴力对转换梁下部纵筋应变影响较大,对钢管柱应变影响较小;带耗能腋撑型钢混凝土转换结构较普通型钢混凝土转换结构的梁端开裂荷载提高了60%、承载力提高了6.2%、延性系数提高了57.24%、等效黏滞系数提高了10.7%,表现出良好的耗能能力,提高了结构的抗震性能。更多还原

【Abstract】 A new type of CFST column-SRC beam transfer structure with supplemental energy dissipation haunch braces was proposed to improve the seismic behavior.Two 1∶ 4 scale SRC transfer frame specimens with and without energy dissipation haunch braces were tested under cyclic loading,and the seismic characteristics such as failure patterns,load-displacement curves,development of plastic hinges and strains,energy-dissipation capacity were compared and studied.Test results show that the haunch brace can effectively control the development of beam-column plastic hinges at the panel zone and relocate them to the haunch-transfer beam joint.Considerable effects on the strains of longitudinal reinforcing bars at the bottom of the transfer beam in mid-span and insignificant effects on the strains of the steel tube can be found by applying additional axial force through the haunch brace.Comparing with normal SRC transfer structures,the crack load at the end of the beam of the SRC transfer structure with energy dissipation haunch brace can be improved by 60%,the bearing capacity by 6.2%,the ductility coefficient by 57.24%,and the equivalent viscous coefficient by 10.7%.更多还原