某提篮拱拱肋稳定分析  

Analysis on Stability of X-arch Rib

作　　者：雷坚[1] 

机构地区：[1]同济大学建筑设计研究院(集团)有限公司,上海市200092

出　　处：《城市道桥与防洪》2016年第11期55-57,78,共4页Urban Roads Bridges & Flood Control

摘　　要：以宜兴市梅林大桥为工程背景,拱肋为变截面,且面内有多根吊杆,面外有多道横撑,面内外的稳定系数无法根据规范和理论公式直接得出,需借助有限元软件MIDAS/Civil建立屈曲分析模型,得到一阶面内外失稳安全系数,并求出屈曲临界荷载,并通过欧拉公式反推求得拱肋面内外长细比,查表求出整体稳定系数φx、φy。并分析和总结拱肋间横撑对某提篮拱桥稳定性的影响。According to the engineering background of Meilin Bridge in Yixing City, the arch rib is in variable cross section, and there are many suspenders inside of the surface and many cross arms outside of surface. The stability coefficients inside and outside of surface are hard to directly obtain based on the standard and theoretical formula. It is required to use the finite element software MIDAS/Civil to establish the buckling analysis model so as to give the safety coefficients of the instability inside and outside of the first-order surface and obtain the buckling critical load. And the slenderness ratio inside and outside of arch rib is given by the back calculation of Euler formula. The integral stability coefficients φx、φy are obtained by the table lookup.The article analyzes and summarizes the influence of the cross arms among arch ribs on the stability of a X-arch bridge.

关 键 词：提篮拱 面内外稳定 失稳安全系数 整体稳定系数 横撑 

分 类 号：U441[建筑科学—桥梁与隧道工程]