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根据钢管混凝土构件统一理论的弯矩-曲率关系,对构件弹塑性状态下截面的弯矩-转角关系进行推导,提出构件M铰和PMM铰特性值的计算方法。利用Midas/Civil软件静力弹塑性分析功能,输入计算确定的塑性铰特性值,对3个矩形钢管混凝土桁梁进行分析,并与试验结果进行对比。研究表明:钢管混凝土构件塑性铰特性值的确定方法是合理的,对矩形钢管混凝土桁梁承载力的分析结果是可信的,为大型钢混组合桁架梁桥的分析提供了有效手段;3个桁梁的承载力均受到节点控制,弦杆填充混凝土能够有效提高桁梁节点的强度和刚度,从而提高桁梁的承载能力,减小桁梁的整体变形;弦杆填充混凝土对杆件轴力和轴向应力影响较大,对整体变形影响不大。
According to the moment-curvature relationship of CFST component theory, the moment-rotation relationship of the section under the elastic-plastic condition of the component is deduced, and the calculation method of the hinge value of the component M hinge and the PMM is proposed. With the help of the static elasto-plastic analysis function of Midas / Civil software, the calculated values of the plastic hinges are input and the three rectangular CFST truss girders are analyzed and compared with the experimental results. The results show that the method of determining the value of plastic hinge property of CFST members is reasonable, and the analysis results of the bearing capacity of CFST truss girders are credible, which provides an effective method for the analysis of the large steel composite truss girder bridges. Three The bearing capacity of the truss girder is controlled by the nodes. The chord-filled concrete can effectively increase the strength and rigidity of the truss girder, so as to improve the bearing capacity of the truss girder and reduce the overall deformation of the truss girder. And axial stress greater impact on the overall deformation of little.