工字形钢梁-矩形钢管柱单向螺栓节点抗弯承载力理论计算方法

Theoretical calculation method for bending bearing capacity of joints between H-shaped beam and rectangular hollow section column using blind bolts

针对工字形纯钢梁和钢-混凝土组合梁分别与矩形钢管柱和矩形钢管混凝土柱采用单向螺栓(也称单边拧紧螺栓)连接形成的4种节点形式,对其在弯矩作用下的受力机理及破坏模式进行分析,讨论导致节点失效的因素。总结节点在弯矩作用下的9种失效模式,包括:单向螺栓拉断、端板受弯屈服、矩形钢管柱壁翼板受拉屈服、矩形钢管柱壁翼板受压屈服、矩形钢管柱壁腹板受压屈曲、混凝土楼板局部压溃、钢筋屈服、矩形钢管柱内混凝土局部压溃、矩形钢管柱壁腹板受压屈服,进而基于破坏模式给出节点各组件承载力的计算公式。对4种节点在不同破坏模式下的正弯矩承载力和负弯矩承载力进行分析,给出节点承载力计算公式。将节点抗弯承载力的理论计算结果与试验结果进行对比,验证理论计算方法的可靠性。

For the four types of joints formed by blind bolt connection between H-shaped pure steel beam,steel-concrete composite beam and rectangular steel tube column,rectan-gular concrete filled steel tube column respectively,the force mechanism and failure mode under the action of bending moment are analyzed,and the factors leading to joint failure are discussed.Nine failure modes of joints under bending moment are summarized,including tensile fracture of blind bolt,flexural yield of end plate,tensile yield of column flange plate,compressive yield of column flange plate,compressive buckling of column web plate,local collapse of concrete slab,yield of steel bars,local collapse of concrete in rectangular steel tube column,and compressive yield of column web plate.Based on the failure modes,the calculation formula of the bearing capacity for each component of the joint is given.The calculation formula of flexural capacities of four joints under the action of sagging and hog-ging moments with different failure modes is given.Finally,the accuracy of calculation for-mula is verified based on the test results of the flexural capacities of the joints.