大跨度吊车梁托柱支承屋盖系统的破坏机理分析  

Failure mechanism analysis of roof system supported by columns on large-span crane girders

作　　者：刘俊[1,3] 王建强 范力 庄继勇[2] 陈思雨 罗峥 李想 LIU Jun;WANG Jianqiang;FAN Li;ZHUANG Jiyong;CHEN Siyu;LUO Zheng;LI Xiang(College of Civil Engineering Xi′an Univ.of Arch.&Tech.Xi′an 710055,China;Baowu Equipment Intelligent Technology Co.,Ltd.,Shanghai 201900,China;XAUAT Engineering Technology Co.,Ltd.,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]宝武装备智能科技有限公司,上海201900 [3]西安建筑科大工程技术有限公司,陕西西安710055

出　　处：《西安建筑科技大学学报（自然科学版）》2023年第4期607-615,共9页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：国家自然科学基金项目(52178163,52078413)。

摘　　要：兼做屋盖系统托柱支承的大跨度吊车梁构件,会因非同步吊车荷载作用导致横梁两端产生较大相对转角及变形差,进而增加梁端节点焊缝疲劳破坏的风险,若托柱支承节点失效,上部屋盖系统会发生连续倒塌.本文以某设置大跨度吊车梁托柱节点的厂房为例,采用SAP2000建立了厂房整体结构有限元模型,分析了上柱失效后的屋盖系统竖向变形和梁柱内力重分布情况.根据整体结构有限元模型分析结果,采用ABAQUS进一步建立了吊车梁托柱节点局部精细化模型,分析了梁托柱节点区域应力、焊缝应力及竖向位移结果,进而提出了避免结构倒塌的处理方法.分析表明:厂房破坏发生在梁托柱节点,节点破坏后,上柱下沉造成周边屋面主梁及相邻列上柱内力重分布,应力超出一般设计保留的富裕度,梁端转角及吊车往复荷载会大幅增加梁托柱节点焊缝应力及疲劳.该研究结果可为采用类似节点做法的厂房抗连续倒塌设计提供思路,并指出了吊车梁兼具其余功能时变形面临的问题.The large-span double beam component,which is also used as the supporting column of the roof system,will cause a large relative rotation angle and deformation difference at both ends of the beam due to the asynchronous crane load,thus increasing the risk of fatigue damage of the beam end weld seam.Therefore,if the supporting point of the supporting column fails,the upper roof system will collapse continuously.In this paper,taking a factory building with large-span crane beam joist joints as an example,the finite element model of the overall structure of the factory building is established using SAP2000,and the vertical deformation of the roof system and the redistribution of the internal forces of the beam and column after the failure of the upper column are analyzed.According to the results of the finite element model analysis of the overall structure,the local refined model of the crane beam joist joints is further established by ABAQUS.The stress,weld stress and vertical displacement results of the beam column joint area are analyzed,and the treatment method to avoid the collapse of the structure is put forward.The analysis shows that the failure of the plant occurs at the beam-column joint.After the joint is damaged,the upper column sinks,causing the internal force redistribution of the surrounding roof main beam and the adjacent column,and the stress exceeds the abundance retained by the general design.The beam end corner and the reciprocating load of the crane will significantly increase the weld stress and fatigue of the beam column joint.The research results in this paper can provide ideas for the anti-continuous collapse design of the workshop with similar joint method,and point out the problems faced by the deformation of the crane beam when it has other functions.

关 键 词：钢吊车梁变形 托柱节点 节点破坏 屋面倒塌 

分 类 号：TU391[建筑科学—结构工程]