SCFT柱-H型钢梁平面框架抗震性能分析

发布时间：2018-07-17 00:50

【摘要】：针对SCFT柱-H型钢梁平面框架,采用ANSYS建立非线性模型,进行了7组框架模型在低周反复荷载作用下的受力特性分析,研究了轴压比和有无填充墙对SCFT柱框架力学性能的影响规律.分析发现:7组框架模型滞回曲线饱满,骨架曲线下降段平缓;在受压单肢钢管受压区达到屈服强度时,SCFT柱仍可视为整体受力构件并继续承担更大荷载,有效延缓整体框架的塑性变形,因此,SCFT柱框架具有良好的抗震性能;轴压比对SCFT柱框架的刚度退化影响并不明显,随轴压比增加,框架的极限承载力和延性有所降低,达到极限承载力后的强度退化明显;填充墙在SCFT柱框架加载前期能够有效分担水平荷载,显著提高框架承载力和弹性刚度,但刚性连接会加剧墙体过早压碎破坏,建议工程中采取柔性连接或预留缝隙,以减小填充墙震害,并改善墙体与SCFT柱框架的协同工作性能.
[Abstract]:Aimed at the plane frame of SCFT column-H steel beam, the nonlinear model was established by ANSYS, and the mechanical characteristics of seven groups of frame models under low cyclic loading were analyzed. The influence of axial compression ratio and filled wall on the mechanical properties of SCFT column frame is studied. It is found that the hysteretic curve of the 7 groups of frame models is full and the descending section of the skeleton curve is smooth, and that the SCFT column can still be regarded as a whole bearing member and continue to bear a larger load when the compressive zone of the single leg steel tube reaches yield strength. The plastic deformation of the whole frame is effectively delayed, so SCFT column frame has good seismic performance, the stiffness degradation of SCFT column frame with axial compression ratio is not obvious, with the increase of axial compression ratio, the ultimate bearing capacity and ductility of SCFT column frame decrease, and the ultimate bearing capacity and ductility of SCFT column frame decrease with the increase of axial compression ratio. When the ultimate bearing capacity is reached, the strength degradation is obvious, the infilled wall can share the horizontal load effectively in the early stage of SCFT column frame loading, and the bearing capacity and elastic stiffness of the frame can be improved significantly, but the rigid connection will aggravate the premature crushing failure of the wall. It is suggested that flexible connection or reserved gap should be adopted in order to reduce the earthquake damage of infilled wall and to improve the cooperative working performance of wall and SCFT column frame.
【作者单位】：天津大学建筑设计规划研究总院;天津大学建筑工程学院;天津大学建筑学院;
【分类号】：TU392.1;TU352.11

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