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连续式的拱上结构与主拱实为一整体,共同承受荷载。有时为简化计算,而将连续桥面梁从拱跨中分割出来,不考虑其与主拱共同工作,按刚性支承的连续梁进行内力分析,此完全不能反映其真实的受力情况。按连续梁计算求得的影响线的形状、符号以及正负面积均不同于按共同工作考虑计算所得的。前法计算所得的影响线面积,尤其是梁的弯矩影响线面积,大多小于后法计算所得到的。有关文献也论证了,无论主拱与梁两者截面刚度比值如何,共同工作对棋上结构内力均有较大的影响,不可不考虑。《铁路工程技术规范》(征求意见稿)第二篇桥涵第9-7
Continuous arch structure and the main arch as a whole, to bear the load. Sometimes to simplify the calculation, and the continuous deck beams are separated from the arch span, regardless of their work together with the main arch, according to rigid support of the continuous beam internal force analysis, which can not fully reflect the true force situation. The shape, the sign and the area of the influence line calculated from the continuous beam are different from those calculated according to the joint work consideration. The influence line area calculated by the former method, especially the bending moment influence line area of the beam, is mostly smaller than that calculated by the latter method. The relevant literature also argues that no matter what the ratio of the cross-section stiffness between the main arch and the beam, joint work has a great influence on the structural internal forces of the chess and must be considered. “Railway Engineering Specifications” (draft) second bridge culvert Section 9-7