广告牌支架梁贯通式节点极限承载力数值分析

Simulation analysis of ultimate bearing capacity of beam-through joint in billboard bracket

户外大型广告牌支架采用钢管杆件时,梁柱相贯节点多采用梁贯通式节点,研究其极限承载力,可为实际工程提供参考依据。文章采用有限元分析软件,研究了梁贯通式、无内隔板柱贯通式、带内隔板柱贯通式3种形式梁柱节点的极限承载力及其破坏模式。结果表明:梁贯通式节点的受力性能与带内隔板的柱贯通式节点类似,且优于无内板的柱贯通式节点;圆管梁壁厚和梁柱直径比是影响梁贯通式节点极限承载力的主要因素,其中梁柱直径比对节点极限承载力的影响更为显著;以梁柱直径比0.67为界限,随其比值增大,梁贯通式节点破坏模式由梁端塑性铰破坏转变为节点域破坏,因此建议实际工程中应用梁贯通式节点的梁柱直径比控制范围宜≤0.67。

When large-scale outdoor billboard bracket adopts steel pipe member,the beam-column intersecting joints mostly adopt beam-through joint.The study of the ultimate bearing capacity of the beam-through joint can provide reference in actual engineering.The paper used finite element analysis software to study the ultimate bearing capacity and failure modes of beam-column connections of three types,which are beam-through joint,column-through joint without inner stiffening plate and column-through with inner stiffening plate joint.The results show that the force performance of beam-through joint is similar to that of column-through joint with internal diaphragms,and is better than that of column-through joints without inner plates.The wall thickness of beam and the beam-to-column diameter ratio are the main factors affecting the ultimate bearing capacity of the joints,in which the beam-to-column diameter ratio has a more significant influence on the ultimate bearing capacity of the joint.Taking the beam-to-column diameter ratio 0.67 as the limit,as the beam-to-column diameter ratio increases,the failure mode of beam-through joint changes from the beam end plastic hinge failure to the joint domain failure.It is recommended that the control range of beam-to-column diameter ratio of beam-through joint should be≤0.67 in practical engineering.