螺栓拼接钢梁的抗弯性能

Flexural Behavior of Bolt-Spliced Steel Beams

对具有螺栓拼接的H型钢梁进行抗弯性能试验.考虑了拼接板上不同螺栓数量对节点性能的影响,研究了拼接节点的破坏特点、抗弯强度和刚度.研究发现拼接螺栓的初始滑移对节点后续阶段的承载力和刚度产生了明显不利的影响,拼接截面应变分布不再符合平截面假定;相比无拼接H型钢梁,翼缘拼接板受力更大,钢梁挠度更大;翼缘拼接板先于H型钢梁翼缘进入屈服,但是拼接节点的极限弯矩试验值可达到H型钢梁的全截面屈服弯矩的计算值;螺栓滑移后的拼接节点不能简单地按照刚接处理.提出了考虑节点转动刚度影响的H型钢梁挠度计算方法与公式,并得到了试验数据的验证.

Experiments on the bending bahavior of H-steel beams with a bolted splice were conducted,in which the influnce of the number of bolts in the splice plate on the connection behavior was considered.The failure mode,bending strength,and rigidity of the bolted splice were investigted.It was found that the initial slip of the bolts had an obviously adverse effect on both load-bearing capacity and rigidity at the subsequent stage.The strain distribution at the cross section of the bolted splice did not accord with the plane-section assumption.The force in flange splice plate and the deflection of the beam were larger than those in the H-steel beam without a bolted splice.The flange splice plate yielded earlier than the flange of H-steel beam,but the experimental value of ultimate bending moment of the bolted splice came up to the calculation value of full-section yield bending moment of the H-steel beam.The bolted splice could not be simlply regarded as a rigid joint after the initial slip of bolts took place.The method and formula for calculatong the deflection of bolt-spliced H-steel beams,dealing with the influence of rotational rigidity of a bolt splice,were proposed and validated by the experimental data.