系杆拱桥极限承载力参数研究

极限承载力分析对于拱桥的设计具有十分重要的意义.理想线弹性结构的理论屈服强度通常采用特征值屈曲分析法得到,但结构材料非线性和几何非线性却使得结构通常无法达到其理论强度极值.因此,运用有限元分析程序ANSYS对系杆拱桥的极限承载力进行参数分析与比较,探讨两类稳定问题及相应的极限承载力求解方法,可为同类桥梁的设计提供参考和验证.

Parameter Study of Ultimate Capacity of Tied-arch Bridges

Ultimate capacity analysis is crucial for the design of arch bridges. Theoretical buckling strength of an ideal elastic structure is commonly forecasted by eigenvalue buckling analysis, but most structures can not reach their theoretical strength limit due to nonlinear behavior of material and geometrical nonlinearity of structure. Based on ANSYS software, the ultimate capacity of a tied-arch bridge is investigated and the effects of different parameters on the ultimate capacity are also discussed, which will supply references for the design of the same kind of bridges.