铁路活载在桥面板沿桥轴方向的分布宽度,一般采用120厘米,这是沿用雅可布逊等《钢筋混凝土桥计算》一书的建议(图1a),按此建议,如用标准设计的道碴厚度及钢筋混凝土轨枕的尺寸计算,则只能算出90厘米的分布宽度(图1b),这显然是不合理的。本文试图从考虑钢轨、轨枕与桥面板整体性出发,讨论活载沿桥轴方向的分布问题。一、轨枕反力的计算计算轨枕反力时,可将钢轨视为一根支承在连续弹性基础上的无限长梁。当承受一系列 Railway live load in the bridge deck along the axis of the distribution width of the bridge, the general use of 120 cm, which is the use of Jacobs and other “reinforced concrete bridge calculation” a book recommendations (Figure 1a), according to this proposal, such as the use of standard design Of ballast thickness and the size of the reinforced concrete sleeper, it can only calculate the distribution width of 90 cm (Figure 1b), which is obviously unreasonable. This paper attempts to consider the rail, sleeper and the integrity of the bridge deck to discuss the live load distribution along the axis direction of the bridge. First, the calculation of sleeper reaction When calculating rail reaction force, the rail can be regarded as a support on the basis of a continuous beam infinite beam. When to bear a series