螺栓排列对内填钢板胶合木梁柱和梁式节点力学性能的影响

Effect of Bolt Arrangements on Mechanical Properties of Beam-Column and Beam Joints of Glulam with Slotted-in Steel Plate

为研究螺栓排列方式对内填钢板胶合木节点力学性能的影响,对螺栓齐列、错列的胶合木梁柱节点及梁式节点进行单调加载试验。探讨节点失效模式及破坏机理,获得该类节点的弯矩-转角及荷载-位移曲线,并对节点的刚度、延性、承载能力进行分析。试验结果表明,除加载初期,螺栓与螺孔之间因初始空隙发生接触的低刚度段外,节点受力过程大致可分为弹性工作阶段、带裂缝工作阶段和破坏阶段。螺栓错列可以提高梁柱节点及梁式节点的受弯、抗拉承载力和极限变形:其屈服弯矩和抗拉屈服荷载相较于螺栓齐列梁柱节点及梁式节点,分别提高了35%和7.1%。螺栓错列梁柱节点在塑性阶段变形较小,其延性系数约为螺栓齐列梁柱节点的71%;螺栓错列梁式节点的塑性变形较大,延性较好,抗拉延性系数为螺栓齐列梁式节点的2.79倍。

In order to study the effect of bolt arrangements on the mechanical properties of bolted glulam joints with slotted-in steel plates,monotonic loading tests were carried out on beam-column joints and beam joints in square and stagger bolt arrangements.The failure mode and failure mechanism were studied.The stiffness,ductility,and bearing capacity of these joints were analyzed through the bending moment-rotation and load-displacement curves.The test results indicate that in addition to the low stiffness phase when the bolt contacts the screw hole at the initial loading stage,the stress process of bolted glulam joints were divided into elastic,crack,and failure stages.The staggered arrangement of bolts improve the bending and tensile bearing capacity and ultimate deformation of beam-column joints and beam joints:the yield bending moment and tensile yield load increase by about 35%and 7.1%respectively,compared to the beam-column joints and beam joints in square bolt arrangements.For the staggered bolted joints,the deformation of beam-column joints in the plastic stage is small.The ductility coefficient is about 71%of that of the squared bolted beam-column joints.The staggered bolted beam joints have better plastic deformation and ductility.The tensile ductile coefficient is 2.79 times that of squared bolted beam joints.