铁道科学与工程学报Issue(6)：1387-1393,7.
几何非线性对沪通公铁两用长江大桥的影响
Influences of geo metric nonlinearity on Hutong co mbined highway and railway Yangtze river bridge
摘要
Abstract
Hutong Yangtze river bridge under construction is a combined highway and railway cable -stayed bridge with extremely large span,scale and live load.In this paper the U.L nonlinear FEMis used,and the in-fluences of three types of geometric nonlinearity on the deformation and stress status of Hutong Yangtze river bridge are studied with the reference of largest mid -span deflection.The result shows the combined effect of the three types of geometric nonlinearity to the deformation and stress status of the bridge can increase by1 2.60%. Among the three types of geometric nonlinearity,the effect of cable sag effect is the largest,reaching 7.73%, exceed the combined effect of large displacement effect and girder -tower effect.If the cable elastic modulus are revised according to Ernst formula to considering the influence of the cable sag effect,the cable forces which computed through linear elastic analysis under dead load plus live load can be used.The results have enough precision thus the iterative computations are not needed.If the cable elastic modulus are revised using the cable forces only under dead load,the influence of cable sag effect will be multiple exaggerated,so it is not feasible.关键词
几何非线性/公铁两用斜拉桥/垂度效应/大位移效应/梁柱效应Key words
geometric nonlinearity/combined highway and railway cable -stayed bridge/cable sag effect/large displacement effect/girder -tower effect分类
交通工程引用本文复制引用
张晔芝,刘剑光,张晓龙..几何非线性对沪通公铁两用长江大桥的影响[J].铁道科学与工程学报,2015,(6):1387-1393,7.基金项目
中国铁路总公司科技研究开发计划课题 （）
