装配式冷弯开口薄壁型钢桁架檩条力学性能研究  

Mechanical behavior study on prefabricated truss purlin system with cold⁃formed open thin⁃walled steel

作　　者：贾斌 吴体 余少乐 张元植 陈科 JIA Bin;WU Ti;YU Shaole;ZHANG Yuanzhi;CHEN Ke(Sichuan Institute of Building Research,Chengdu 610081,China;Sichuan Huashi Group Co.,Ltd.,Chengdu 610081,China;China Construction Eighth Engineering Division Co.,Ltd.,Shanghai 200135,China;The IT Electronics Eleventh Design&Research Institute Scientific and Technological Engineering Co.,Ltd.,Chengdu 610021,China)

机构地区：[1]四川省建筑科学研究院有限公司,成都610081 [2]四川华西集团有限公司,成都610081 [3]中国建筑第八工程局有限公司,上海200135 [4]信息产业电子第十一设计研究院科技工程股份有限公司,成都610021

出　　处：《建筑结构》2025年第5期16-23,共8页Building Structure

基　　金：四川省科技计划重点研发项目(2019YFS0071)。

摘　　要：装配式平面桁架结构构造简单、施工便利,在工业建筑围护体系中应用较为广泛。对采用螺栓装配式连接的冷弯薄壁型钢平面桁架进行稳定分析,推导其弹性整体稳定承载力。通过静力加载试验,对桁架试件的承载能力、局部应力以及破坏特征等关键参数进行了分析。并且分别用梁单元和壳单元建立桁架结构的有限元分析模型,模拟实际使用时的边界条件和荷载工况,获得相应荷载-位移曲线及破坏形态,壳单元模型能够较精确地模拟构件局部非线性行为。试验及有限元分析均表明,节点偏心构造使桁架端部存在应力和变形集中部位,弦杆局部屈曲降低了桁架整体承载能力。在理论和试验分析基础上,提出加固改造和优化设计两种方案,通过增强端部刚度和优化桁架构造提升整体承载能力,并采用数值模拟方法验证了方案的合理性。Prefabricated plane truss structure is simple in structure and convenient in construction,and has a good application prospect in industrial building envelope system.The stability of cold⁃formed open thin⁃walled steel plane truss with bolt assembly connection was analyzed and its elastic stability bearing capacity was deduced.Through static load test,the key parameters such as bearing capacity,local stress and failure characteristics of truss specimens were analyzed.The finite element analysis models of truss structures were established by using beam element and shell element respectively to simulate the boundary conditions and load conditions in actual use,and the corresponding load⁃displacement curves and failure modes were obtained.The shell element model can accurately simulate the local nonlinear behavior of members.The test process and finite element analysis show that there are stress and deformation concentration parts at the end of the assembled truss with eccentric joints,and the local buckling of the chord reduces the overall bearing capacity of the truss.On the basis of theoretical and experimental analysis,two schemes of reinforcement and optimization design were proposed respectively.The overall bearing capacity was improved by enhancing the end stiffness and optimizing the truss structure,and the rationality of the scheme was verified by numerical simulation.

关 键 词：冷弯开口薄壁型钢 平面桁架 檩条 力学性能 静力试验 

分 类 号：TU391[建筑科学—结构工程] TU394