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随着公路与城市道路交通运输事业的日益发展,我国的弯桥设计计算工作已是目前迫切需要深入研讨的课题了。例如北京至八达岭公路上的黄土咀钢筋混凝土连续梁弯桥(25米+32米+25米)的建成;以及天津市十一经路跨线钢筋混凝土连续弯桥的建成,这都将使我国的弯桥建设推向了一个新的阶段。关于弯桥的内力计算问题,最主要是如何精确地确定各种内力和变形的纵向影响线问题;以及如何正确地确定荷载横向分布(或内力横向分布)的问题。本文仅就关于内力纵向影响线的确定问题进行了一些探讨,主要采用有限元法编制了计算机程序,并计入了双力矩的影响,同时还与黄土咀桥的计算成果(用邢志成同志推导的公式)进行了比较,以供设计计算参考。
With the continuous development of highway and urban road transportation, the design and calculation of curved bridges in our country are the urgent topics that need further study. For example, the construction of the Loess Tsui Tsui Tsui Tsui Tsuen Continuous-Reinforced Concrete Beam Bridge (25m + 32m + 25m) from Beijing to Badaling Highway and the construction of a continuous curved reinforced concrete bridge over the 11th Ring Road in Tianjin will all make our country Curved bridge construction to a new stage. As for the problem of internal force calculation of curved bridges, the most important problem is how to accurately determine the longitudinal influence lines of various internal forces and deformations and how to correctly determine the transverse load distribution (or lateral force distribution). In this paper, some discussions about the determination of longitudinal influence line of internal forces are carried out. The computer program is mainly developed by finite element method and the influence of double moment is taken into account. At the same time, the calculation results of Huangtu Tsui Bridge (deduced from Comrade Xing Zhicheng Formula) is compared for the design calculation reference.