考虑力组合效应的钢框架端板连接力学行为  

Mechanical behavior of steel frame end-plate connections considering force combination effect

作　　者：梁刚 郭宏超[1,2] 刘云贺[1,2] 杨迪雄[1,2] LIANG Gang;GUO Hongchao;LIU Yunhe;YANG Dixiong(School of Civil Engineering and Architecture,Xi’an University of Technology,Xi’an 710048,China;State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China(Xi’an University of Technology),Xi’an 710048,China)

机构地区：[1]西安理工大学土木建筑工程学院,陕西西安710048 [2]省部共建西北旱区生态水利国家重点实验室(西安理工大学),陕西西安710048

出　　处：《地震工程与工程振动》2019年第1期96-105,共10页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(51308454);中国博士后科学基金项目(2013M542371);西安理工大学科技新星项目~~

摘　　要：为研究不同力组合效应对平齐端板连接力学行为的影响,采用ABAQUS程序建立不同受力情况下连接的非线性简化有限元模型,通过与国内外典型试验结果对比分析,验证了有限元模型的可靠性。基于此通过考虑8种力组合因素的影响,分析了2种不同钢等级的梁柱节点力学行为,进一步讨论了EC3 Part 1-8规范的适用性。结果表明:简化有限元模型在弯矩-转角曲线、破坏形态、初始刚度和塑性抗力等方面与试验结果吻合良好。框架梁轴力对节点的力学行为影响显著,当轴拉力为20%的框架梁轴向塑性抗力N_(pl)时,高强钢节点的刚度和强度分别降低68%和52%;当轴压力为-20%N_(pl)时,刚度和强度分别增加89%和42%。此外节点的滞回耗能能力、破坏模式以及分类属性与梁轴力水平密切相关。对于高强钢梁柱平齐端板节点,EC3规范对框架梁轴压力的限值仍过于保守。研究结果对于提高结构的抗倒塌能力和组合力作用下的理论研究具有重要参考价值。In order to study the influence of the different force combination effect on the mechanical behavior of flush end-plate connection.Non-linear simplified finite element models of the connection were developed using ABAQUS under the different forced cases,and proved to be correct and applicable compared with typical test results at home and abroad.Based on the finite element model,the mechanical behavior of the flush end-plate connection with two steel grades were analysed by considering the eight force combination effects.In addition,the effectiveness of EC3 Part 1-8 was discussed.The analytical results reveal that the simplified finite element model agrees well with the experimental results in terms of moment rotation curve,failure modes,initial stiffness and plastic resistance.The presence of an axial force on the beam significantly affect the connection behavior,when+20%of the beam plastic resistance(N pl)is applied to the beam,the initial stiffness and strength of the specimens using HSS decrease by 68%and 52%respectively,and of the specimens increased by 89%and 42%respectively when it is-20%N pl.Furthermore,energy dissipation capacity,failure mode and classification properties of the joints are closely related to the level of axial force on the beam.For the flush end-plate connection using HSS,the EC3 method is too conservative in the cases of compression force.The research result makes a certain contribution in improving the anti-collapse capabilities and theoretical researches for steel structure under the combined forces.

关 键 词：钢结构 平齐端板连接 高强钢 有限元方法 力学性能 破坏模式 弯矩和轴力 

分 类 号：TU391[建筑科学—结构工程]