高速铁路简支梁桥变形变位设计参数研究  

Study of Deformation and Displacement Related Parameters of High-Speed Railway Simply-Supported Girder Bridge

作　　者：李克冰 崔堃鹏 李玉琳 班新林 LI Ke-bing;CUI Kun-peng;LI Yu-lin;BAN Xin-lin(China Academy of Railway Sciences Co.,Ltd.,Beijing 100081,China;China Fire and Rescue Institute,Beijing 102201,China;Shandong Youth University of Political Science,Jinan 250103,China)

机构地区：[1]中国铁道科学研究院集团有限公司,北京100081 [2]中国消防救援学院,北京102201 [3]山东青年政治学院,山东济南250103

出　　处：《桥梁建设》2021年第5期44-52,共9页Bridge Construction

基　　金：国家自然科学基金高铁联合基金项目(U1934205);中国铁道科学研究院集团有限公司科研项目(2020YJ215);中国消防救援学院专项资金项目(2020KY010)。

摘　　要：为研究高速铁路简支梁桥徐变、沉降等变形变位参数的合理设计限值,以车-桥耦合动力分析理论为基础,分析不同残余徐变变形、墩台工后沉降以及两者同时存在对高速铁路32 m、40 m简支梁桥行车安全性和旅客舒适性的影响。结果表明:残余徐变变形与墩台工后沉降对车体的竖向加速度影响更显著,对轮重减载率影响很小,简支梁桥工后变形变位限值主要受车体加速度等舒适性指标控制;同时考虑残余徐变变形与墩台工后沉降的影响时,车辆动力响应明显增大,40 m简支梁的车体加速度小于32 m简支梁的车体加速度;不同速度等级的高速铁路桥梁可采用不同的变形变位限值,在残余徐变变形固定为10 mm,且设计时速为250,300,350 km时,32 m(40 m)简支梁墩台工后沉降限值分别为6(8),8(10),6(12) mm。The rational limit values of deformation and displacement related parameters,including creep and settlement,of the high-speed railway simply-supported girder bridge are studied.Based on the vehicle-bridge coupling analysis theory,the influential factors of riding safety and human comfort of the high-speed railway simply-supported girder bridges with 32 m spans and 40 m spans,respectively were analyzed,incorporating various types of residual creep deformation and/or settlement of piers and abutments.The results demonstrate that the residual creep deformation and settlement of piers and abutments can exert significant effect on the vehicle body acceleration,but minor effect on the wheel load reduction rate.The deformation and displacement limit values of the simply-supported girder bridge after completion are mainly controlled by the comfort indexes,such as vehicle body acceleration.When both the residual creep deformation and settlement of piers and abutments after completion are concerned,the dynamic responses of vehicles are significantly augmented,while the vehicle body acceleration on the simply-supported girder bridge with 40 m spans is smaller than that on the simply-supported girder bridge with 32 m spans.Different deformation and displacement limit values should be given for high-speed railway bridges that allow for different running speeds.When the residual creep deformation is set at 10 mm and the design speeds are set at 250,300 and 350 km/h,the corresponding limit settlement values of the abutments and piers for the simply-supported girder bridge with 32 m spans are 6,8 and 6 mm,while for the simply-supported girder bridges with 40 m spans,the values are 8,10 and 12 mm.

关 键 词：高速铁路桥 简支梁桥 残余徐变变形 墩台工后沉降 设计限值 动力响应 行车安全性 乘车舒适性 

分 类 号：U448.13[建筑科学—桥梁与隧道工程] U448.217[交通运输工程—道路与铁道工程]