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基于U.L列式单元增量平衡方程,采用单元节点截面内力塑性系数法建立钢管混凝土空间梁单元弹塑性刚度矩阵,并编制了钢管混凝土拱桥空间稳定分析方法及设计程序,采用初始内力法考虑阶段间体系转换及弹性内力的传递,计算分析了益阳资江三桥主孔钢管拱桥施工阶段及成桥使用阶段空间稳定性,探讨了材料非线性以及桥面以上拱肋之间加设横向风撑对其稳定安全系数的影响。
Based on the incremental balance equation of UL column element, the unit elastic-plastic stiffness matrix of CFST beam was established by the method of internal force and plasticity of element joint cross-section and the spatial stability analysis method and design procedure of CFST arch bridge were established. The initial internal force method System transition and the transmission of elastic internal forces, the spatial stability of the steel pipe arch bridge of Yiyang Zijiang Bridge was calculated and analyzed. The nonlinearity of material and the lateral wind support between the ribs above the bridge deck were discussed. Effect of safety factor.