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基于约束混凝土的总应变裂缝本构模型,利用大型通用有限元程序MIDAS/FEA建立了空钢管桁架、钢管-钢管混凝土组合桁架和钢管混凝土桁架的有限元模型,进行约束混凝土本构模型的有效性验证及试验桁架静力性能分析。结果表明,文中有限元模型能较好地反映钢管-钢管混凝土组合桁架的静力性能,可以对影响组合桁架静力性能的各种参数进行分析。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。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。
Based on the constitutive model of the total strain of confined concrete, a finite element model of the hollow steel tube truss, the steel tube-steel tube concrete truss and the concrete-filled steel tube truss was established by using the large-scale finite element program MIDAS / FEA to constrain the constitutive model of the concrete Verification and Experimental Analysis of Truss Static Performance. The results show that the finite element model in this paper can well reflect the static behavior of the steel-concrete-filled trusses, and can analyze various parameters that affect the static performance of the composite truss. The truss failure occurs at the node site, but the failure modes of the nodes are different, and the filling of the concrete supervisor changes the node failure mode. The ultimate bearing capacity of the truss is controlled by the nodes. The concrete filled in charge of the competent truss can effectively increase the strength and stiffness of the truss joint, so as to improve the bearing capacity of the truss and reduce the overall deformation of the truss.