蝶形拱桥主梁的非线性行为及影响因素分析

发布时间：2018-05-13 04:11

本文选题：桥梁工程 + 非线性行为　；参考：《公路交通科技》2014年05期

【摘要】：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。
[Abstract]:Compared with other arch bridges, the nonlinear behavior of the main beam of butterfly arch bridge is difficult to master, and the traditional design method, which does not fully consider the nonlinear influence, is no longer applicable. Based on the self-compiled program, the nonlinear behavior of the main girder of the butterfly arch bridge under various nonlinear factors is comprehensively analyzed, and the influence and regularity of the design parameters such as the inclination angle, the rise-span ratio and the steel ratio are studied. The results show that the Liang Zhu effect of arch rib element is unfavorable to the moment of the main beam, but the Liang Zhu effect of the main beam element can effectively counteract the adverse effect, and the nonlinear behavior law of the main beam moment is more complex than that of the deflection. The influence coefficient of unloaded lateral beam is greatly affected by offset distance, and the influence coefficient of deflection and bending moment of each beam is increased with the increase of the inclination angle of the main arch rib. The influence of the steel content of the main arch rib and the angle between the plane of cable arch on the nonlinear behavior of the main beam can be neglected.
【作者单位】：中铁大桥勘测设计院集团有限公司;四川巴陕高速公路有限责任公司;交通运输部公路科学研究院;
【基金】：国家自然科学基金项目(51138007) 国家科技支撑计划项目(2011BAJ09B02)
【分类号】：U448.22

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