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异型拱桥由于造型独特其非线性行为规律较为复杂且难以掌握。利用自编程序分析了5座各具特点的异型拱桥的非线性行为规律,通过对比总结出以下结论:整体上,拱梁组合式蝶形拱桥中梁柱效应的影响最大,飞燕式系杆拱桥中大位移效应的影响最大,拱塔斜拉桥中索的垂度效应最为明显,而对于有推力的新月形拱桥,各非线性因素的影响均较小,可忽略不计;相对竖直索,斜索的垂度效应较为明显,且其索力受各非线性因素的影响均较大,计算时宜计入斜索的垂度效应并应对斜索索力进行非线性分析;对于仅承受荷载而不参与整体受力的桥面板和横梁,内力受非线性因素的影响很小,采用线性方法具有足够的精度,但计算位移时需计入大位移效应的影响。
Shaped arch bridge because of its unique shape of the nonlinear behavior of the more complex and difficult to grasp. The self-programmed program is used to analyze the nonlinear behavior of five arch-shaped arch bridges with different characteristics. The conclusions are drawn as follows: On the whole, the effect of beam-column in arch-arch combined butterfly arch bridge is the most important, The effect of large displacement in the arch bridge is the most important, and the effect of sag in the arch cable-stayed bridge is most obvious. For the crescent-shaped arch with thrust, the influence of each nonlinear factor is small and negligible. The relative vertical The sag effect of cable and skew cable is obvious, and the cable force is greatly affected by the nonlinear factors. The calculation should be included in the sag effect of slope cable and should be nonlinear analysis of cable force. For load-bearing only But does not participate in the overall force of the bridge deck and beams, the internal force is very small nonlinear factors, the linear method with sufficient accuracy, but the displacement calculation to be included in the large displacement effect.