埋置式框架桥结构内力敏感性分析  

Structural Sensitivity Analysis for Embedded Frame Bridges

作　　者：刘颖 张春华[1] 段宝山[1] 

机构地区：[1]中交第二公路勘察设计研究院有限公司,武汉430056

出　　处：《交通科技》2017年第6期23-26,共4页Transportation Science & Technology

摘　　要：为探讨钢筋混凝土埋置式框架桥的各项设计参数对不同跨径及填土高度结构的受力影响,借助有限元分析软件建立模型并进行受力分析。结果表明,跨径、填土高、拱顶半径增大均会明显增加结构弯矩;结构净高增大能稍许减小结构拱顶所受正弯矩,但对结构立墙顶部负弯矩有明显不利影响。埋置式框架结构与传统桥梁不同之处在于其以土为回填材料,引入了土与结构的相互作用。在计算方面,土体逐层添加并分层计算,与传统土压力计算方法相比能更准确地反应结构的真实受力情况。To figure out the effects of reinforced concrete embedded frame bridges' design parameters on structural internal forces,the models is analyzed via a finite element analysis software.The results demonstrate that:the increase of span,cover and arch radius will significantly increase the bendingmoment;higher structure height will result inmarginally smaller positive moment at the mid-span,but obvious adverse effects on negative moment at the top of side walls.The difference between embedded frame structure and conventional bridge is that the soil is used as backfill material and the interaction of soil and structure is involved.And in the aspect of calculation methods,the soil is counted incrementally and canbe calculated for each load step.Compared with traditional method,it can reflect more accurate structural force condition.

关 键 词：埋置式框架桥 土与结构的相互作用 有限元分析 拱顶半径 净高 基础宽度 

分 类 号：U443.31[建筑科学—桥梁与隧道工程]