自攻螺钉参数设置对胶合木梁柱节点受力性能的影响

采用自攻螺钉对胶合木梁柱节点进行横纹加强可有效传递木材的横纹拉应力和顺纹剪应力，从而延缓木材开裂、提高节点性能。为了研究自攻螺钉的布置间距、直径和个数等参数对加强节点受力性能的影响，对4组采用不同布置间距、直径和个数的自攻螺钉加强胶合木螺栓连接梁柱节点进行单调和低周往复加载试验，得到各组节点的刚度、延性、承载力、破坏模式和抗震性能。结果表明：自攻螺钉个数增加、直径增大，节点的承载力、破坏转角、延性系数以及节点总耗能增大；自攻螺钉布置间距的变化对节点在单调荷载作用下的承载力和延性系数无明显影响；而节点在往复荷载作用下时，随着自攻螺钉布置间距的减小，节点承载力和总耗能降低。

Effects of self-tapping screw on performance of glulam beam-to-column connections

The self-tapping screw as perpendicular reinforcement for the glulam beam-to-column connection could transmit the tensile stress perpendicular to grain and shear stress parallel to grain effectively, mitigating the propagation of fracture and improving the bearing capacity of connection. The performance of reinforced connection is influenced by parameters such as the diameter, spacing and number of self-tapping screws. In order to better understand the effect of factors mentioned above on the rotational behavior of reinforced connection, the monotonic and low frequency cyclic loading test of four groups of reinforced glulam beam-to-column bolted connections with different diameter, arrangement spacing and number of self-tapping screw were conducted. The stiffness, ductility, moment resistance capacity, failure modes and seismic behavior were studied. The findings indicate that the increase of the number and diameter of self-tapping screws will improve the ultimate moment resistance, the failure rotation, the ductility and the total dissipated energy. The decrease of arrangement spacing between the self-tapping screws leads to lower bearing capacity and less total dissipated energy under reversed cyclic loading. However, it influences the ultimate moment resistance capacity and ductility ratio under monotonic loading slightly.