钢框架连续倒塌分析中全焊接刚性节点的组件模型  

Component-based model of all-welded joint in progressive collapse analysis of steel frames

作　　者：谢甫哲[1] 周广杰 顾斌[1] 雷丽恒 XIE Fuzhe;ZHOU Guangjie;GU Bin;LEI Liheng(Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang, Jiangsu 212013, China)

机构地区：[1]江苏大学土木工程与力学学院,江苏镇江212013

出　　处：《江苏大学学报（自然科学版）》2020年第4期466-472,共7页Journal of Jiangsu University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51608234);江苏省自然科学基金资助项目(BK20160534,BK20160536);江苏大学高级人才基金资助项目(13JDG067)。

摘　　要：为准确反映全焊接刚性节点在钢框架结构倒塌过程中的受力状态,对其在结构大变形情况下的受力机理和分析模型进行了研究.基于对全焊接刚性节点试验的准确模拟,研究了节点在弹塑性状态下的受力机理和变形特点,并对传统的节点组件模型进行了改进;分别对采用不同节点模型的钢框架子结构进行静力和动力非线性分析,研究不同节点模型对钢框架结构抗连续倒塌性能的影响.结果表明:全焊接刚性节点在弹塑性阶段以节点域的剪切变形为主;悬链线效应引起的梁内轴拉力不仅削弱节点的承载力,还降低节点的延性;改进节点组件模型能够较准确地反映钢框架结构在连续倒塌静力和动力分析时节点的弹塑性受力状态.To accurately reflect the real state of all-welded joints in the collapse process of steel frame structures,the mechanism and analysis model of the all-welded joints were investigated under large structural deformation condition.Based on the accurate simulation of the experiment for all-welded joint,the mechanism and the deformation characteristics of all-welded joint in elastic-plastic stage were investigated,and the traditional component-based model of all-welded joint was improved.The static and dynamic nonlinear analyses of steel frame substructures with shell element model,improved component-based model of joint and ideal rigid model of joint were respectively carried out,and the influence of joint model on the progressive collapse resistance of steel frames was investigated.The results show that the shear deformation of the panel zone accounts for the main part of the all-welded joint deformation in elastic-plastic stage.The axial tension of beam not only weakens the strength of joint,but also reduces the ductility.The elastic-plastic behavior of all-welded joint during the progressive collapse of steel frames can be accurately simulated by the improved joint component-based model in the static and dynamic analyses.

关 键 词：全焊接刚性节点 连续倒塌 节点组件模型 悬链线效应 动力非线性分析 

分 类 号：TU393.3[建筑科学—结构工程]