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本文利用能量原理,将二维侨梁空间结构计算图式简化到一维的弹性支承连续梁,从而导得了弹性支承刚度、连续梁的换算刚度及考虑结构抗扭影响的抗扭弹簧刚度。每项均具有明确的物理意义,力学概念清晰,系统地证明了桥梁结构确是可以简化成弹性支承连续梁来进行分析的、并且能适用于主梁刚度不等的一般结构,本质上解决了弹性支承连续梁法中存在的一些疑难问题。为复杂的桥梁结构横向受力分析提供了一个普遍的方法。一、基本原理
In this paper, the energy theory is used to simplify the calculation of the spatial structure of the Qiaoqiao beam to one-dimensional elastically-supported continuous beam, which leads to the stiffness of the elastic support, the converted stiffness of the continuous beam, and the torsion spring stiffness considering the torsion effect of the structure. Each item has a definite physical meaning, the concept of mechanics is clear, and it is systematically proved that the bridge structure can be simplified as an elastically supported continuous beam for analysis, and can be applied to the general structure of unequal rigidity of the main beam, essentially solving the problem. There are some difficult problems in the elastic support continuous beam method. It provides a universal method for the analysis of lateral forces of complex bridge structures. First, the basic principle