Computation model of additional longitudinal forces of continuously welded rails on bridges
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摘要: 中国新建铁路桥上无缝线路设计及墩台顶纵向力计算暂行规定尚处于试行阶段, 有些地方还很值得探讨, 其中之一就是其常量阻力计算模型。从理论上证明以该力学模型计算桥上无缝线路伸缩附加力, 当跨径很大时, 有可能不存在有力学意义的解, 并结合实例加以说明, 当荷载较小时, 以该力学模型计算挠曲附加力, 也有可能不存在有力学意义的解, 以三跨连续梁为例, 对该问题进行了论证。针对常量阻力计算模型的缺点, 建议对大跨度铁路桥梁应采用变量模型。Abstract: The temporary design criterion for computation additional longitudinal force between rail and abutment and pier on CWR bridge is still being studied at present in China, there are many items, which are deserved to discuss, one of them is the constant longitudinal resistance mechanics model. It is proved that additional flexible longitudinal force, which has the mechanics meaning, is probable not to exist for the long-span bridge with the model. When the load is light, the mechanics meaning solution for the additional winding force is also probably not exist with the model. Because of the shortcomings of the constant model, the variable longitudinal resistance mechanics model should be adopted on the long-span railway bridge.
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[1] LU Yao-rong, FENG Shu-qing. Calculation method for the discrete force of CWR on railway bridge[J]. Journal of the China Railway Science, 1987, 9(2): 56-67. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-ZGTS202101007.htm [2] 广钟岩, 铁路无缝线路[M]. 北京: 中国铁道出版社, 2001. [3] 张健峰, 庄军生. 铁路新干线上桥梁的特殊规程[R]. 联邦德国铁路管理总局, DS899/59, 1991. [4] LI Guo-qing. Study on longitudinal additional forces in continuously welded rails on high-speed railway bridges[J]. China Railway Science, 1997, 18(3): 15-23. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-GGYY202006001.htm [5] JIANG Jin-zhou. Additional longitudinal forces in continuously welded rails and their transmission on railway bridges[J]. China Railway Science, 1998, 19(2): 67-75. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-ZGTK202004018.htm [6] 卜一之, 张进. 高速铁路桥梁附加纵向力传递机理及传力构造的研究[R]. 北京: 铁道部科学研究院, 1996. [7] XU Qing-yuan, CHEN Xiu-fang. Additional longitudinal forces transmission between bridges and continuously welded rails with small resistance fasteners[J]. Journal of Traffic and Transportation Engineering, 2003, 3(1): 25-30. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-JYGC202101011.htm [8] XU Qing-yuan, CHEN Xiu-fang. Study on additional longitudinal forces transmission between continuously welded rails and continuous beam bridge[J]. China Railway Science, 2003, 24(3): 58-62. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-ZGRK201406009.htm -
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