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本文提出铁路桥上经受温度变化作用的无缝线路计算理论。计算理论分三座铁路钢桥的试验进行了对比:一是无缝线路与桥面直接扣着的无碴桥;二是铺设木枕的有碴桥;三是钢轨、垫钣、轨枕可沿纵向滑动的自由扣着方式的无碴桥。根据理论计算可提出一个铺设无缝线路的桥梁容许伸缩长度。它随桥梁支座(固定与活动)的布置、材料(钢、复合材料、混凝土或预应力混疑土)、道床与桥面系的状态和构造,以及钢轨断面等条件而定。本文说明了某些参数对于钢轨应力和位移、桥梁固定支座受力以及曲线桥受力的影响。
In this paper, the calculation theory of seamless line subjected to temperature change on railway bridge is proposed. Computational theory is divided into three railway steel bridge tests were compared: First, the seamless line with the bridge deck directly buckle ballastless bridge; Second, laying a wooden pillow ballast bridge; Third, rail, cushion sheet, sleeper can be along Free-lanced ballastless bridge that slides longitudinally. Based on theoretical calculations, a bridge can be proposed to lay the seamless line allowable length of expansion. It depends on the placement of the bridge supports (fixed and movable), the material (steel, composite material, concrete or prestressing soil), the condition and structure of the ballast bed and deck, and the rail profile. This paper shows the influence of some parameters on the stress and displacement of the rail, the force of the bridge fixed bearing and the force of the curved bridge.