某下承式钢管混凝土拱桥二类稳定分析研究  

Analytical Study of Category 2 Stability of a Concrete Filled Steel Tubular Through Arch Bridge

作　　者：谭国宏[1] 李龙安[1] 

机构地区：[1]中铁大桥勘测设计院有限公司,湖北武汉430056

出　　处：《桥梁建设》2011年第3期36-39,共4页Bridge Construction

摘　　要：为研究下承式钢管混凝土拱桥二类稳定性问题,以某下承式钢管混凝土拱桥的方案设计为背景,利用大型分析软件ANSYS建立3个全桥有限元模型,其钢管混凝土材料分别采用统一理论法、组合截面法和双单元法进行模拟;探讨了二类稳定安全系数的评判标准,根据规范提出了二类稳定安全系数的判定计算方法。计算分析结果表明,统一理论法计算值偏大;组合截面法和双单元法能比较真实地模拟钢管混凝土材料,拱桥稳定性分析二者计算结果相近;该下承式钢管混凝土拱桥稳定性有保证。To study the issue of category 2 stability of concrete-filled steel tubular（CFST） through arch bridges,the conceptual design of a CFST through arch bridge was cited as an example and three finite element models for the whole bridge of the bridge were set up by the large scale analysis software ANSYS.The CFST materials of the models were simulated respectively by the unified theory method,combined section method and dual elements method,the judgment criteria for the category 2 stability safety factors were discussed and the calculation methods for judging the safety factors were proposed in accordance with the relevant codes.The results of the calculation and analysis demonstrate that the calculation values based on the unified theory method are slightly great while the combined section method and the dual elements method can simulate the CFST materials for real.However,the calculations of these methods in the analysis of stability of the bridge are close,showing that the stability of the bridge can be guaranteed.

关 键 词：拱桥 钢管混凝土结构 稳定性 安全系数 非线性 有限元法 

分 类 号：U448.22[建筑科学—桥梁与隧道工程]