长大连续坡道刚构桥上无缝线路力学特性研究

为了研究长大连续坡道上无缝线路的力学特性,以贵阳城市轨道交通1号线为例,建立包括钢轨-桥梁-桥墩的一体化计算模型,分析不同坡度、列车制动荷载和扣件间距条件下轨道结构力学特性的变化规律。计算分析结果表明:坡度和列车制动荷载的增大对钢轨的纵向受力、变形以及桥墩受力均不利,设计时应该合理控制线路的坡度;对于高架结构,随着扣件间距减小,梁轨相互作用增强,贵阳地铁1号线高架结构扣件间距建议值为0.625 m。

Study on Dynamic Characteristics of Continuously Welded Rail Track on Rigid Bridge with Long Steep Grade

In order to analyzes the dynamic characteristics of continuously welded rail track on the long steep grade,the paper takes Gui Yang urban rail transit No. 1 line as an example to establish the integrated model of "rail-bridge-pier "to investigate the changes of the dynamic characteristics of the track structure under the condition of different grades,different train braking loads and different fastening spacing. The results show that the increasing of grade and braking load is negative to the longitudinal stress and deformation of the rail and pier stress. The grade should be properly controlled during the design period. For the elevated structure,with the decreasing of fastener spacing,the interaction between bridge and rail is enhanced. The recommended value of fastener spacing for the elevated structure of Gui Yang urban rail transit No. 1 line is 0. 625 m.