方钢管混凝土组合异形柱防屈曲支撑框架抗震性能试验

Experiment on Seismic Performance of Buckling-Restrained Braced Frame Composed of Special-Shaped Concrete-Filled Square Steel Tube Columns

为研究方钢管混凝土组合异形柱(SCFST柱)防屈曲支撑框架的抗震性能,对一榀1∶2的SCFST柱防屈曲支撑框架模型进行了拟静力试验,同时采用ABAQUS有限元软件对试验模型进行了数值模拟.试验结果表明,试件呈现出防屈曲支撑、钢梁依次出现塑性铰的破坏机制.试件滞回曲线饱满,骨架曲线为S形,且强度和刚度退化不明显,位移延性系数可达3.21.防屈曲支撑耗能能力强,有效保护了框架结构.与异形柱普通支撑框架试验结果进行对比分析可知,异形柱防屈曲支撑框架抗震性能明显优于异形柱普通支撑框架.有限元分析中试件的破坏机制与试验基本一致.

In order to study the seismic behavior of the buckling restrained braced frame of special-shaped column composed of concrete-filled steel tube,an experimental study and a numerical simulation on a 1∶2 model of buckling restrained frame of SCFST columns were carried out.The test results show that the failure mechanism of plastic hinge occurs on buckling restrained braces and steel beams in turn.The hysteretic curve of the component is full,the skeleton curve is S-shaped,the degradation of strength and stiffness is not obvious,and the displacement ductility coefficient reaches 3.21.The energy dissipation capacity of buckling restrained brace is strong,which effectively protects the frame structure.The comparison shows that the seismic performance of the anti buckling support frame of the special-shaped column is obviously better than that of the common bracing frame with the special-shaped column.The failure mechanism of the component from the finite element analysis is basically consistents with that obtained from the test.