考虑施工不确定性的大跨高速铁路桥梁线形控制研究  

Research on Alignment Control of Long-Span High-Speed Railway Bridge Considering Construction Uncertainty

作　　者：杨东 YANG Dong(China Railway 24th Bureau Group Anhui Engineering Co.Ltd.,Hefei Anhui 230011,China)

机构地区：[1]中铁二十四局集团安徽工程有限公司,安徽合肥230011

出　　处：《铁道建筑技术》2024年第4期145-147,186,共4页Railway Construction Technology

基　　金：中铁二十四局集团有限公司科技研发计划项目(2023-01)。

摘　　要：针对设计时速350 km的大跨高速铁路桥梁,研究设置合理的预拱度是保证桥梁线形满足铁路运营的关键步骤。然而,考虑到施工误差的影响,如混凝土超方、养护湿度改变以及预应力损失等,往往导致桥梁的实际预拱度与理论计算值存在较大偏差,进而导致桥梁成桥线形不能满足设计要求。因此,本文以阜淮铁路跨青阜线(72+72)m预应力混凝土T构为工程背景,对施工不确定性下的大跨高速铁路桥梁预拱度设置开展研究,通过深入分析不同设计参数误差对桥梁线形的影响规律,为大跨桥梁的预拱度设置及线形控制提供重要技术支持。For the long-span high-speed railway bridge with a design speed of 350 km per hour,the research and setting of the reasonable pre-camber is a crucial step to ensure the performance of railway operation.However,considering the negative effects of construction errors,such as concrete over-square,curing humidity change and prestress loss,it will cause the actual pre-camber of the bridge may significantly deviate from the theoretical calculation value.Under this circumstance,it will further lead to the alignment of the bridge cannot satisfy with the design requirements.To solve this problem,based on the engineering background of(72+72)m prestressed concrete T structure across Qingfu Line of Fuyang-Huainan Railway,this paper focuses on the pre-camber setting of long-span high-speed railway bridge under construction uncertainties.Through in-depth analysis of the influence laws of different design parameter errors on bridge alignment,important technical support will be provided for the pre-camber setting and alignment control of long-span bridges.

关 键 词：大跨高速铁路桥梁 预拱度设置 参数灵敏度 施工不确定性 线形控制 

分 类 号：U448.215[建筑科学—桥梁与隧道工程] U442[交通运输工程—道路与铁道工程]