【摘要】 通过4个1/3比例变梁中节点试件的拟静力试验,分析了轴压比、配箍率等参数对该类异型节点抗震性能的影响;在试验研究的基础上,结合异型中节点左右梁高不等的特性,提出了等效斜压杆破坏机理。结果表明:异型节点通裂荷载与极限荷载接近,初裂出现在小梁上柱组成的小核心区,最终破坏区域主要发生在大梁下柱组成的大核心区;轴压比变化对异型节点抗震性能的影响不显著,增加核心区配箍率则可以增大节点组合体剪力,减小核心区裂缝间距和宽度,从而改善异型节点的抗震性能。更多还原

【Abstract】 Four specimens of abnormal interior joints were tested under reversed cyclic loading.The experimental study was conducted that focused on the effect of hoop percentage and axial compression ratio on seismic behavior of abnormal joints.The test results indicated that the first cracks appeare in the minor core(determined by the low beam and the top column),and the final failure appeare in the large core(determined by the high beam and the bottom column).The critical crack load is quite nearly with the ultimate load of abnormal joints,and the seismic behavior of the specimens are not influenced by the axial compression ratio but influenced by the joint hoop percentage.With the increasing of joint hoop percentage,the shear strength of the beam-column joint subassemblage increases,the width and space of diagonal cracks become smaller than that of the control specimens.Based on the experimental study,an equivalent strut mechanism for abnormal joint is put forward,and it can be served as a basis for further study on mechanical properties of abnormal beam-column joint.2 tabs,8 figs,10 refs.更多还原