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带悬臂梁段全螺栓拼接的梁柱刚接节点,螺栓孔开成长圆形来提高节点的抗震性能。通过3个长圆孔变型性高强螺栓节点及1个对比节点试件的低周反复加载试验,研究了节点在地震作用下的承载力、延性变形能力、耗能能力、滞回性能,并与传统栓焊节点性能作对比。试验结果表明,这种节点的延性好于传统栓焊节点,通过螺栓在长圆孔中的滑移,可明显提高节点的延性变形能力。最终节点延性破坏,3个试件梁端塑性转角分别达到0.0500 rad、0.0560 rad、0.0523 rad,位移延性系数分别为7.14、5.03、4.51,而栓焊节点的塑性转角与位移延性系数仅能达到0.0204 rad与2.28,较大程度地改善了节点抗震性能。
Beam-to-column joints with spliced cantilever beams, and the bolt holes open into an oval to improve the seismic performance of the joints. Through the low-cycle repeated loading test of three long hole modified high-strength bolted joints and one comparative joint, the bearing capacity, ductile deformation capacity, energy dissipation capacity and hysteretic behavior of the joints under earthquake are studied. Compared with the traditional Shrink welded joints for comparison. The experimental results show that the ductility of this kind of joint is better than that of the traditional bolting joint. The sliding deformation of the bolt in the oblong hole can obviously improve the ductility of the joint. The ductile damage of the final joint was observed. The plastic corner angles of the three specimens reached 0.0500 rad, 0.0560 rad and 0.0523 rad, respectively. The displacement ductility coefficients were 7.14, 5.03 and 4.51, respectively. The plastic corner and displacement ductility coefficients of the welded joints were only 0.0204 rad and 2.28, to a greater extent to improve the node seismic performance.