大跨度桥上无砟轨道铺设弹性隔离缓冲垫层的研究与应用  

Research and Application of Elastic Cushion in Ballastless Track on Long Span Bridge

作　　者：张政[1,2] ZHANG Zheng(China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,China;Key Laboratory of Hubei Province for Railway Track Safety Service,Wuhan 430063,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,武汉430063 [2]铁路轨道安全服役湖北省重点实验室,武汉430063

出　　处：《铁道标准设计》2021年第1期40-45,共6页Railway Standard Design

基　　金：中国铁路总公司科技研究开发计划课题(2015G001-G);中铁第四勘察设计院集团有限公司科技研究开发计划课题(2015K03)。

摘　　要：为探明大跨度桥上无砟轨道铺设弹性隔离缓冲垫层对系统动力特性的影响,基于铺设CRTS双块式无砟轨道的某高速铁路大跨度双塔斜拉桥工点,建立车辆-轨道-桥梁动力耦合精细化分析模型,研究不同弹性隔离缓冲垫层刚度对系统力学性能的影响规律,并在此基础上提出垫层刚度的合理取值。研究表明:垫层刚度的选取对轨道频响具有较为显著的影响;刚度在0.02~0.2 N/mm^3的轨道结构频响的第一主频均在20~100 Hz;垫层刚度为0.1 N/mm^3时,钢轨、道床板的位移频响要小于范围内的其他刚度频响,从轨道结构的振动传递特性考虑,0.1 N/mm^3为较合理的垫层刚度取值;对不同垫层刚度影响较显著的动力学指标进行"归一化"处理,建议垫层刚度的取值为0.07~0.11 N/mm^3。结合谐响应分析结果,建议将垫层刚度取为0.1 N/mm^3。In order to find out the influence of the elastic isolation cushion installed on the ballastless track of the long-span bridge on the dynamic characteristics of the system,this paper establishes a refined analysis model of vehicle-track-bridge dynamic coupling and studies the influence law of the stiffness of different elastic isolation cushions on the mechanical properties of the system based on the construction site of a large-span double tower cable-stayed bridge on a high-speed railway with CRTS double block ballastless track.The reasonable value of cushion stiffness is put forward.The results show that:the selection of cushion stiffness has a significant impact on the frequency response of the track;the first main frequency of the frequency response of the track structure with stiffness of 0.02~0.2 N/mm^3 is in the range of 20~100 Hz;when the cushion stiffness is 0.1 N/mm^3,the displacement frequency response of the rail and the track bed plate is smaller than other stiffness frequency responses in the range;in view of the vibration transmission characteristics of the track structure,0.1 N/mm^3 is a reasonable value of cushion stiffness and the dynamic indexes with significant influence on different cushion stiffness are normalized.It is suggested that the value range of cushion stiffness should be 0.07~0.11 N/mm^3.Combined with the harmonic response analysis,it is suggested that the cushion stiffness should be taken as 0.1 N/mm^3.

关 键 词：大跨度桥梁 无砟轨道 弹性隔离缓冲垫层 车线桥耦合动力分析模型 谐响应分析 刚度 铁路桥 

分 类 号：U213.2[交通运输工程—道路与铁道工程]