为研究多跨简支梁桥上不同无砟轨道对应无缝线路的受力特点，基于梁轨相互 作用原理推导了可以考虑非线性阻力的多跨简支梁梁轨相互作用公式，并与有限元法进 行了对比． 分别建立了 32 m 标准跨度简支梁桥上不同无砟轨道模型，分析对比了实测温 度荷载与制挠力耦合作用下各无砟轨道对应的无缝线路受力规律，同时探讨了简支梁跨 数墩顶刚度以及扣件阻力等结构参数的影响． 结果表明:对于32m 标准跨度简支梁，随着 简支梁跨数的增加，钢轨附加应力最大值趋于稳定，且稳定时的最大值均小于规范限值， 对于铺设无砟轨道的简支梁桥，其跨数不受钢轨附加应力限制;对于单元板式及双块式无 砟轨道，当墩顶纵向刚度大于2000kN/cm 时，墩顶刚度的变化对其钢轨附加应力的影响 很小;多跨简支梁桥上无砟轨道不建议采用小阻力扣件． 

Based on the principle of bridgetrack interaction，the formula of multispan simply supported bridgetrack interaction considering nonlinear resistance was deduced and compared with the finite element ( FE) method to research the continuously welded rail ( CWR) stress of different ballastless tracks on multispan simply supported girder bridges． Different ballastless track models on simply supported girder bridges with standard span of 32m were established，and the rail additional stress distribution and its stable maximum value were analyzed considering the coupled effect of measured temperature and brake flexural force． Meanwhile， the influences of structural parameters such as span number of simply supported bridges，pier top stiffness and fastener resistance on the stress of CWR were also discussed． The results show that for girder bridges with standard span of 32m， the rail maximum additional stress tends to remain unchanged with the increase of the number of the bridge span，and the unchanged value is less than the norm limit; for the simply supported bridge with ballastless track，its span number is not limited by the rail additional stress; for the unitslab and double-block ballastless track， the change of pier stiffness has little effect on the rail additional stress when the pier top stiffness is greater than 2000kN/cm． Small resistance fasteners