新型钢框架焊接节点抗震性能试验与数值分析  

Experimental and Numerical Analysis on Seismic Behavior of a New Type of Steel Frame Welded Connection

作　　者：赵旭冉[1,2] 郑山锁 张晓辉[1,2] 曹琛 ZHAO Xuran;ZHENG Shansuo;ZHANG Xiaohui;CAO Chen(School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;Key Laboratory of Structural Engineering and Earthquake Resistance(XAUAT)of the Ministry of Education,Xi’an 710055,China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]西安建筑科技大学结构工程与抗震教育部重点实验室,陕西西安710055

出　　处：《湖南大学学报（自然科学版）》2020年第11期56-65,共10页Journal of Hunan University:Natural Sciences

基　　金：国家重点研发计划项目(2019YFC1509302);国家自然科学基金资助项目(51678745)。

摘　　要：为提高钢框架焊接节点的抗震性能,提出一种盖板加强与腹板开孔削弱并用的新型节点构造形式.对4个不同构造形式的钢框架焊接节点试件(标准型、盖板加强型、腹板开孔削弱型、新型)进行了低周往复加载试验及有限元分析,对比研究了梁端局部构造形式对钢框架节点破坏模式、滞回性能、承载力、刚度退化、延性及耗能能力的影响.结果表明:相比标准节点,采取局部构造措施的节点均实现了塑性铰外移,使得破坏模式由梁柱连接焊缝处脆性破坏转换为梁局部塑性破坏;塑性变形能力及耗能能力显著提高;塑性应变累积加剧板件局部屈曲,造成强度、刚度逐步退化,抗震性能更优越.新型节点在承载力、刚度基本不变的前提下,延性及耗能能力分别增加了20.0%、27.9%,验证了该类节点的可行性.文中建立的基于应力三轴度损伤准则的有限元模型可有效预测各类型钢框架焊接节点在循环荷载作用下的受力性能.In order to improve the seismic performance of steel frame welded connections,a new type connection with combined strengthened cover and hole weakened web was presented.Low-cyclic reversed loading tests and finite element analysis were carried out on four steel beam-to-column connections with different structural forms(standard form,cover-plate reinforced form,web-opening weakened form,and new form).The influence of local structural forms at beam end on the failure modes,hysteretic behavior,bearing capacity,stiffness degradation,ductility and energy dissipation capacity of the specimens were compared and discussed.The results show that,compared with the standard connection,the connection with local structural forms realizes the outward movement of plastic hinge from the connection zone,making the failure mode from the brittle failure of the connection weld to the plastic failure of the beam.Plastic deformation capacity and energy dissipation capacity are significantly improved as well.Plastic strain accumulation aggravates the local buckling of plates,resulting in gradual degradation of strength and stiffness,and the seismic performance is superior.In addition,under the premise that the bearing capacity and stiffness basically remain unchanged,the ductility and energy dissipation capacity of the new type connection increase by 20.0%and 27.9%,respectively,which verifies the feasibility of this connection.The finite element model,based on stress triaxiality damage criterion illustrated in this paper,can well predict the mechanical performance of various types of steel-frame-welded connections under cyclic loading.

关 键 词：新型钢框架焊接节点 局部构造形式 抗震性能 低周往复加载试验 有限元分析 

分 类 号：TU391[建筑科学—结构工程] TU317.1