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倒V型支撑及其中心节点板连接在特殊中心支撑框架中备受青睐。为了提高其抗震性能和在抗震设计中的应用,对9个非弹性往复荷载作用下的工字截面倒V型支撑及其节点板的滞回性能进行试验和数值模拟。主要参数为:节点板上支撑端部间隙、支撑杆件节点位置、自由端长度与节点板厚的比值。在支撑低周疲劳破坏前,框架的极限承载力并没有降低,但有一个长期的低承载稳定阶段。虽然有直线间隙的试件抗震性能良好,但只要节点板不先于支撑破坏,也可以不设间隙。中等偏心的支撑节点性能很好且尺寸也很经济,但节点板上的支撑杆件位置可能引起板面外变形并降低结构延性。基于试验结果,提出节点板自由边长度与厚度比值限值。
Inverted V-braces and their center gusset plates are favored in special center support frames. In order to improve its anti-seismic performance and its application in seismic design, the hysteretic behavior of inverted V-shaped brace with I-section and its gusset under 9 inelastic reciprocating loads were tested and numerically simulated. The main parameters are: the support plate end gap, support bar node location, the free end length and node board thickness ratio. The ultimate bearing capacity of the frame does not decrease until the low-cycle fatigue failure is supported, but there is a long-term low-load stability stage. Although the specimen with straight-line clearance has good seismic performance, no gap may be provided as long as the joint plate is not damaged before the support. Mid-eccentric support nodes perform well and are economically dimensioned, but the support rod locations on the node plate may cause out-of-plane deformation and reduce structural ductility. Based on the experimental results, the limit value of free edge length and thickness ratio is proposed.