朔黄铁路32 m超低高度预应力混凝土简支T梁适应30 t轴重货车加固改造分析  

Reinforcement and reconstruction of 32 m-span super-low height prestressed concrete simply-supported T-girder on Shuozhou-Huanghuagang railway suitable for 30-ton axle-load freight wagon travelling

作　　者：闫晓夏 柯在田[2] 徐玉胜[1] 苏永华[2] 马林[2] 

机构地区：[1]中国铁道科学研究院深圳研究设计院,广东深圳518034 [2]中国铁道科学研究院铁道建筑研究所,北京100081

出　　处：《铁道建筑》2014年第11期1-5,共5页Railway Engineering

基　　金：国家科技支撑计划项目(2013BAG20B00)

摘　　要：对朔黄铁路跨度32 m超低高度预应力混凝土简支T梁适应轴重30 t及以上重载货车(1.2倍ZH(2010)活载)进行了检算分析,结果表明梁体的竖向刚度和力学性能已不能满足现行铁路规范的要求,需对桥梁进行加固改造。选取顶升预弯辅助钢梁的加固方案,使原混凝土梁和预弯辅助钢梁组成组合结构,在活载作用下二者跨中挠度协调一致,在30 t轴重活载作用下梁体的抗裂性、强度和竖向刚度等各项关键指标均满足现行规范要求,能够达到预期加固效果。T hrough the calculations of 32 m-span super-low height prestressed concrete simply-supported T-girder on the Shuozhou-Huanghuagang railway under 30-ton heavy haul railway,it indicated that the actual force-bearing performance and the stiffness of the girder could not meet the requirement of the rating standard,thus demanding the strengthening and retrofit. A reinforcing method with a pre-bent steel beam was selected. T he original concrete girder and the pre-bent steel beam were combined to a composite structure,and the deflection of the composite structure was coordinated under live load. It indicated that the crack resistance,the strength and the vertical stiffness meet the requirement of the current rating code,proving its reinforcement effect.

关 键 词：重载铁路 超低高度简支 T梁 加固改造 组合结构 

分 类 号：U441.4[建筑科学—桥梁与隧道工程] U445.72[交通运输工程—道路与铁道工程]