大跨径悬索桥主缆安全系数的研究  

Study of Safety Factor of Main Cable of Long Span Suspension Bridge

作　　者：徐军[1] 王晓冬[1] 唐茂林[2] 宋晖[1] 

机构地区：[1]中交公路规划设计院有限公司,北京100088 [2]西南交通大学,四川成都610031

出　　处：《桥梁建设》2011年第5期50-52,68,共4页Bridge Construction

基　　金：国家科技支撑计划重点项目(2008BAGO7B01)

摘　　要：为研究主跨1 000m以上大跨径悬索桥主缆安全系数的取值问题,建立西堠门大桥(主跨1 650m的两跨连续梁悬索桥)空间几何非线性有限元模型,分别按照各国的荷载标准对模型进行加载,计算结构在荷载作用下的内力及位移,并根据相应的规范进行荷载组合,计算出主缆相应的安全度,采用Wyatt公式进一步计算模型考虑主缆二次应力后的安全系数。计算分析结果表明,大跨径悬索桥主缆安全系数可由2.5降低至2.3,从而给出了大跨径悬索桥主缆容许应力安全系数2.3的建议值。To study the value selection for the safety factor of the main cable of long span suspension bridge with a main span longer than 1 000 m,the finite element model of spatial geometric nonlinearity was set up for the Xihoumen Bridge（a two-span continuous girder suspension bridge with a main span 1 650 m）,the loads were applied to the model respectively in accordance with the load standards of different countries and the internal forces and displacement of the structure under the action of the loads were calculated.Also in accordance with the corresponding codes or standards,the loads were combined,the safety degrees of the main cable were calculated and the safety factor of the model that took account of secondary stress of the main cable was further calculated by the Wyatt Formula.The results of the calculation and analysis reveal that the safety factor of the main cable of the long span suspension bridge can be reduced to 2.3 from 2.5 and accordingly,the proposed value of the safety factor 2.3 of allowable stress for the main cable is given.

关 键 词：悬索桥 设计规范 主缆 安全系数 二次应力 荷载标准 

分 类 号：U448.25[建筑科学—桥梁与隧道工程] U442.51[交通运输工程—道路与铁道工程]