论文部分内容阅读
设计了支主管宽度比β=1.0的空钢管、部分填充混凝土和钢管混凝土3种桁架,利用大型通用有限元程序MIDAS/FEA建立了有限元分析模型,进行了3种桁架受力性能的对比分析。研究结果表明:桁架破坏均发生在节点部位,但节点失效模式不同,主管内填混凝土改变了节点的失效模式。3个桁架的极限承载力均受到节点控制,主管内填混凝土能够有效提高桁架节点的强度和刚度,从而提高桁架的承载能力,减小桁架的整体变形。所建立的有限元模型能较好地分析部分填充混凝土矩形钢管桁架的力学性能,通过对各种影响参数进行分析,得到桁架受力的一般规律,为实际工程应用提供理论依据。
Three types of trusses, including empty steel tube with branch width ratio β = 1.0, partially filled concrete and concrete filled with steel tube, were designed. The finite element analysis model was established by the large-scale finite element program MIDAS / FEA and the comparative analysis of the mechanical behaviors of the three trusses . The results show that: truss failure occurred in the node site, but the node failure mode is different, the competent concrete filling changes the node failure mode. The ultimate bearing capacity of the three trusses is controlled by the nodes. The filling of the concrete in charge of the competent trusses can effectively improve the strength and rigidity of the truss nodes, so as to improve the bearing capacity of the truss and reduce the overall deformation of the truss. The finite element model established can well analyze the mechanical properties of the partially filled rectangular steel tube truss. By analyzing various influence parameters, the general law of the truss force is obtained, which provides the theoretical basis for the practical engineering application.