设置垫板的T形件螺栓连接滞回性能试验研究

为提高传统T形件连接的耗能能力, 在T形件之间设置两块矩形垫板使T形件翼缘在拉、压荷载作用下均能屈服耗能。设计制作了4个设置垫板的T形件连接试件和1个未设置垫板的试件, 进行往复拉压作用下的拟静力试验。结果表明:通过设置垫板提高T形件连接的耗能能力是可行的;设置垫板的试件滞回性能稳定、滞回环饱满, 在拉、压荷载作用下均能耗散能量, 耗能能力为相同构造不设置垫板试件的150%左右;设置垫板试件在拉力和压力作用下受力机理不同, 抗压承载力和刚度大于其抗拉承载力和刚度;随着垫板宽度的增加, 试件的抗压承载力和抗拉承载力均有所提高。

EXPERIMENTAL RESEARCH ON THE HYSTERETIC BEHAVIOR OF BOLTED T-STUB CONNECTION WITH INSERTED PLATES

In order to enhance the energy-dissipation capacity of traditional bolted T-stub connections, two rectangular plates are proposed to be inserted between T-stubs so as to make the T-stub flanges yield in both tension and compression loads. Five specimens with or without inserted plates were designed and set up, then they were experimentally tested under cyclic loading conditions. Test results show that: the proposal to enhance the energy-dissipation is feasible; the hysteretic performance of the specimens with inserted plates is stable and their load-deformation loops are plump; the specimens with inserted plates can dissipate energy in both tension and compression loads, thusly the energy dissipated by them is about 150% of that by the specimen without inserted plates; the bearing capacity and stiffness under compression load are larger than that under tension one because of different mechanism; along with the increase of the plate width, the bearing capacity is improved in both tension and compression.