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蝶形拱桥造型独特其主梁部分的非线性行为规律相对其他拱桥较为难掌握,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下蝶形拱桥主梁部分的非线性行为并研究了外倾角、矢跨比、含钢率等设计参数的影响及规律。结果表明:拱肋单元的梁柱效应对主梁弯矩的影响是不利的,而主梁单元的梁柱效应能够有效地抵消这种不利影响;主梁弯矩的非线性行为规律相对挠度更加复杂;未加载侧边梁的影响系数受偏载距离的影响较大;各梁跨中挠度和弯矩的影响系数均随主拱肋外倾角的增大而增大;主拱肋含钢率和索拱平面间夹角对主梁非线性行为的影响可以忽略。
The nonlinear behavior of the main beam of the butterfly arch bridge is more difficult to grasp than other arch bridges. The traditional design methods that do not fully consider the nonlinear effects are no longer applicable. Based on the self programming, the nonlinear behavior of the main beam of the butterfly arch bridge under various non-linear factors is analyzed in detail and the influence and rules of the design parameters such as camber angle, pitch-span ratio and steel-bearing ratio are studied. The results show that the beam-column effect of arch rib unit is unfavorable to the bending moment of the main beam, while the beam-column effect of the main beam unit can effectively counteract this adverse effect. The nonlinear behavior law of the main beam has more relative deflection The influence coefficient of unloaded side beams is more affected by the partial load distance; the influence coefficient of deflection and moment of mid-span of each beam increases with the increase of main camber camber; And the influence of the included angle between the arch plane on the nonlinear behavior of the main girder can be neglected.