无缝线路大跨简支梁桥桥墩线刚度优化

摘要

为获得大跨高墩长联桥上无缝线路设计的控制因素,探讨了大跨高墩长联桥墩台线刚度的合理取值.基于桥上无缝线路力的传递机理,建立了钢轨-主梁-桥墩-基础一体化力学模型；利用APDL参数化语言对ANSYS进行二次开发,建立了参数化优化模型,编制了桥墩线刚度优化程序.结合实际工程,分析了跨度64m的有碴轨道简支梁桥墩顶纵向水平线刚度的限值.分析结果表明:梁轨快速相对位移及钢轨附加应力控制大跨高墩长联桥上无缝线路的整体设计,该跨度为64 m的有碴轨道简支梁桥墩顶纵向水平线刚度的限值应超过750 kN/cm.%In order to obtain the key factor of the overall design of a large-span high-pier long-league bridge,the reasonable value of pier longitudinal stiffness was discussed.Based on stress transfer mechanism of continually welded rail on bridge,a rail-beam-pier-foundation integration model was established.A parameterized optimization model was built,and a pier line stiffness optimizer was compiled by the means of ANSYS re-developing with APDL parameter design language.By combining with an actual project,the pier longitudinal stiffness limitation of a 64 m simply-supported beam bridge with continually welded rails was analyzed.The analysis results show that the rapid relative displacement between beam and rail and the additional stress of rail are key factors of the overall design of a large-span high-pier long-league bridge with continually welded rails,and the pier longitudinal stiffness limitation of the 64 m simply-supported beam bridge with continually welded rails ought to be greater than 750 kN/cm.