铁路上承式混凝土拱桥极限跨径的分析  

Analysis on the Ultimate Span of Railway Concrete Deck Type Arch Bridges

作　　者：赵会东 

机构地区：[1]中国铁路总公司,北京100844

出　　处：《高速铁路技术》2017年第6期29-32,共4页High Speed Railway Technology

基　　金：中国铁路总公司科技研究开发计划重点课题(2016G002-1)

摘　　要：混凝土拱桥的跨越能力取决于混凝土的抗压能力,文章以混凝土拱桥在轴力作用下的压应力达到混凝土容许应力为控制条件,分析得出了主拱自重状态下的极限跨径。在此基础上结合上部结构、二期恒载、活载与拱圈自重的比例关系,得到了铁路上承式混凝土拱桥的极限跨径,并给出了不同标号混凝土的工程实用极限跨度建议值,研究结果可为工程设计人员掌握上承式混凝土拱桥的跨越能力和结构材料选用提供理论依据。The span capacity of concrete arch bridge depends on the anti-pressure capacity of concrete.Using the axial compressive stress of the arch reaching the allowable compressive strength of the concrete as the control condition,the ultimate span of main arch under arch-ring dead weight condition is analyzed and concluded in the paper.Based on this,we can get the ultimate span of railway concrete deck arch combined with ratio relationship of the superstructure,secondary dead load,the live load to arch-ring dead weight.On the basis of theoretical span,the proposed values of project practical ultimate spans are given when adopting different grades of concrete.The research provides the theoretical foundation on span capacity and structure material selection of concrete deck arch bridge for designers.

关 键 词：极限跨径 铁路上承式混凝土拱桥 容许应力 弹性稳定 荷载比例 

分 类 号：U441.2[建筑科学—桥梁与隧道工程]