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蝶形拱桥由于拱肋外倾其非线性行为规律较之普通拱桥更加难以掌握,传统未充分考虑非线性影响的设计方法已不再适用。在自编程序的基础上,全面分析了各种非线性因素对蝶形拱桥外倾拱和3类索非线性行为的影响及规律。结果表明:相对主梁单元,拱肋单元的梁柱效应对拱顶横向位移的影响较大;恒载工况下,面外弯矩的影响系数呈波浪形变化;计算拱肋轴力时可忽略非线性因素的影响;考虑全部非线性因素后主吊索力的非线性影响系数由长索向短索递增,影响系数与索力值成反比;相对主梁单元,拱肋单元的梁柱效应对斜拉索和副吊索索力的影响较大。
Due to the non-linear behavior of arch ribs, the non-linear behavior of arch ribs is more difficult to grasp than that of ordinary arch bridges. The traditional design methods that do not fully consider nonlinear effects are no longer applicable. On the basis of self-programming, the influences and regularities of various nonlinear factors on the nonlinear behavior of the arch-type arch bridge and the third-type cable are comprehensively analyzed. The results show that the effect of beam-column effect on the lateral displacement of the arch is greater than that of the main beam unit. The influence coefficient of the out-of-plane bending moment varies wavy under the condition of constant load. Ignoring the influence of nonlinear factors; the nonlinear influence coefficient of main sling force after considering all the nonlinear factors increases from long cable to short cable, the influence coefficient is inversely proportional to the cable force value; the relative beam element, Effect on the stay cable and vice sling force greater impact.