钢管混凝土拱桥弹塑性分析

建立分块分段的纤维模型,对具有哑铃型截面拱肋的拱桥进行弹塑性分析.建立U.L.列式三维虚功增量方程,采用荷载和位移加载控制,结合Newton-Raphson增量迭代法,求解杆系结构大位移问题.计算单圆管截面钢管混凝土拱肋弹塑性状态下的荷载-挠度全过程分析曲线,计算结果和文献7]结果吻合较好,验证了模型的正确性.在工程分析中,有效地计算了深圳FR桥的哑铃型截面钢管混凝土拱肋的承载力系数.

Elastoplastic analysis of arched bridge with concrete-filled steel tubular components

Blocking fiber model was established and elastoplasticity of dumbbell-shaped arched ribs on arched bridge was analyzed.The large-displacement problem of rod-system structure was solved by means of setting up U.L.column three-dimensional increment equation of virtual work,employing loading control of loads and displacements,and adopting Newton-Rophson increment iteration method.Load-deformation curves for analysis of overall process were computed in elastoplastic condition of concrete-filled steel tubular arched ribs with single tubular cross-section.The computation result was well consistent with that in reference 7],so that the validity of this model was proved.In the engineering analysis of Shenzhen's FR bridge,the coefficient of bearing capacity of its concrete-filled steel tubular arched ribs with dumbbellshaped cross-section was effectively evaluated.