静力荷载下CRTSⅡ型无砟轨道-桥梁结构体系的力学性能  

Mechanical performance of CRTSⅡballastless track-bridge structural system under static load

作　　者：张广潮 周凌宇[1] 魏天宇 杨林旗 赵磊 曾一回 ZHANG Guangchao;ZHOU Lingyu;WEI Tianyu;YANG Linqi;ZHAO Lei;ZENG Yihui(School of Civil Engineering,Central South University,Changsha 410075,China;China RailwayWuhan Survey and Design&Institute Co.Ltd.,Wuhan 430074,China;Guangdong Branch,China Railway Design Corporation,Shenzhen 518000,China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]中铁武汉勘察设计研究院有限公司,湖北武汉430074 [3]中国铁路设计集团有限公司广东分公司,广东深圳518000

出　　处：《中南大学学报（自然科学版）》2021年第5期1712-1723,共12页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51578546,U1434204,U1934217);中南大学中央高校基本科研业务费专项资金资助项目(2020zzts157);湖南省研究生教育创新工程和专业能力提升工程项目(CX20200368)。

摘　　要：利用三跨CRTSⅡ型板式无砟轨道-简支梁桥结构体系1:4缩尺模型,开展单梁和梁轨协同作用下的静载试验,并对比分析其特性及轨道结构对结构体系刚度的影响规律。根据轨道结构与简支梁桥界面滑移模式,以能量变分原理为基础,建立无砟轨道-简支梁桥结构体系的控制微分方程,并利用最小势能原理推导结构体系挠度与滑移的理论解。研究结果表明:在承受竖向静力荷载时,无砟轨道-简支梁桥结构体系横截面纵向应变沿竖向分布不满足平截面假定,但轨道结构与简支箱梁的纵向应变分别在各自的横截面高度范围内满足平截面假定;轨道结构铺设后,梁轨结构体系的抗弯刚度和竖向刚度分别较单梁提升29.14%和77.57%;无砟轨道-简支梁桥结构体系不同截面处的界面抗剪切刚度有较大差异。Based on the 1꞉4 scale model of three-span simply supported box-beam bridge with CRTSⅡballastless track structural system,the mechanical load test under the synergistic effect of single beam and the track-beam was carried out.With the comparative analysis,the deformation characteristics of this structural system and the influence laws of the track on its stiffness were obtained.According to the slip mode of the interface between the track and the beam,the control differential equation of the structural system was established,and the theoretical equations of deflection and slip of the structural system were proposed by using the principle of minimum potential energy.The results show that the longitudinal strain of the cross section of the structural system does not meet the plane section assumption under the vertical static loads.However,the plane section assumption is valid on the track and the beam of the structural system according to the test.When the ballastless track is laid,the bending stiffness and vertical stiffness of the structural system increase by 29.14%and 77.57%respectively compared with those of the single beam.Moreover,the shear stiffness of the interface at different sections of the structural system is quite different.

关 键 词：CRTSⅡ型板式无砟轨道 无砟轨道-简支梁桥结构体系 刚度 最小势能原理 

分 类 号：U213.2[交通运输工程—道路与铁道工程]