带U形连接件的加强式梁柱弱轴端板连接节点抗震性能研究  

Study on the Seismic Behavior of Weak-Axis End-plate Joint of Reinforced Beam to Column with U-shaped Connector

作　　者：聂少锋[1] 王硕 刘波 刘哲 韩勇 NIE Shaofeng;WANG Shuo;LIU Bo;LIU Zhe;HAN Yong(School of Civil Engineering,Chang’an University,Xi’an 710061,China;Institute of Naval Engineering Design,Naval Research Academy,Beijing 100070,China)

机构地区：[1]长安大学建筑工程学院,西安710061 [2]海军研究院海防工程设计研究所,北京100070

出　　处：《建筑钢结构进展》2023年第1期38-48,共11页Progress in Steel Building Structures

基　　金：国家自然科学基金(51408052);陕西省重点研发计划项目(2021SF-519);陕西省青年科技新星项目(2016KJXX-51)。

摘　　要：对带U形连接件的肋板加强式钢梁-H形钢柱弱轴端板连接节点的抗震性能开展数值研究。在验证有限元模型准确性的基础上,分析了U形连接件厚度、加强肋板长度、加强肋板高度和梁端端板厚度对该节点破坏模式、抗弯承载力及抗震性能的影响。结果表明:该节点属于典型的梁柱半刚性连接节点,具有较好的转动能力;在H形钢柱弱轴设置U形连接件可使其与柱腹板和翼缘形成箱形节点域,增大节点域体积和抗剪切变形能力,提高节点抗弯承载力。U形连接件厚度取为0.83tf~1.16tf(tf为柱翼缘厚度)时,梁端形成塑性铰并先于U形连接件发生破坏;设置端板加强肋板可使梁端塑性铰远离节点区,避免钢梁与端板连接处焊缝应力集中,满足“强节点、弱构件”的抗震设防目标。同时提出了梁端端板厚度和加强肋板构造的建议取值,可供工程设计参考。A numerical study on the seismic behavior of the weak-axis end-plate joints of rib reinforced steel beam-H-shaped steel column with U-shaped connectors is carried out.Based on a verified finite element model,the influences of the thickness of U-shaped connector,the length and height of rib,and the thickness of end-plate on failure modes,bending capacity and seismic performance of the joint are analyzed.The results show that the joint is a typical semi-rigid connection and has a good rotational ability.The U-shaped connectors connected with the weak axis of the H-shaped steel column can form a box region,which increases the volume of the joint region,shear deformation resistance and the flexural capacity of the joint.If the thickness of the U-shaped connector ranges from 0.83tf~1.16tf(tf represents the flange thickness of the column),the plastic hinge is formed at the beam end which causes the earlier damage of beam end.The reinforced rib at the end plate can make the plastic hinge of the beam end far away from the joint region,avoiding the high-stress concentration at the welding between steel beam and the end plate.This satisfies the seismic demands of"strong joint and weak member".The thickness of the end plate and the stiffened rib is proposed,which can be used as a reference in future engineering design.

关 键 词：梁柱弱轴连接 U形连接件 端板连接 抗震性能 数值分析 

分 类 号：TU398[建筑科学—结构工程]