连续梁桥上无缝线路纵向附加力的变化规律

通过建立连续梁桥上无缝线路附加纵向力的计算模型，对连续梁桥上无缝线路纵向附加力进行了计算．分析了不同的线路纵向阻力、固定支座布置位置、跨长、跨数及联数对纵向附加力的影响，并对相应的变化规律进行了总结．研究结果表明，为了降低连续桥上无缝线路纵向附加力，应采用小阻力扣件以降低线路纵向阻力；若条件允许，连续梁的跨长不宜过大，且固定支座应尽量靠中布置，以降低纵向附加力；连续梁联数对于纵向附加力的影响有一定限度，当联数达到一定数量时，纵向附加力值将趋于恒定．

Variety Rules of Additional Longitudinal Force of Continuously Welded Rails on Bridge with Continuous Beam

The mode of additional longitudinal force of continuously welded rails on bridge with continuous beam is established.Additional longitudinal force of continuously welded rails on bridge is calculated and effects on additional longitudinal force are analyzed which consist of longitudinal resistance,layout of fixed bearings,span length,the number of spans and the number of continuous beam.Variety rules are also summarized.As results indicated,in order to decrease the additional longitudinal force of continuously welded railway on bridge,the fastenings of small resistance should be used,if it is permitted,the span length of continuous beam should not be too large,and the fixed bearings should be installed in the middle to decrease the additional longitudinal force,the number of continuous beam has limit effect on additional longitudinal force,and additional longitudinal force tends to remain constant when the number of continuous beams is over a certain amount.