摘要
采用响应面法对自锚式悬索桥主梁主跨中点挠度进行非线性随机静力分析,考察自锚式悬索桥主跨中点挠度随结构材料、几何尺寸及外荷载等不确定性因素的变异而发生变化的规律.有限元分析模型中考虑了主缆几何非线性及主梁P-Δ效应等的非线性行为.自锚式悬索桥结构主缆的面积、弹性模量以及主梁的面积的变异对主梁主跨中点挠度影响最为显著,在外部车辆荷载中不同车辆轴重的变异对主跨中点影响程度不尽相同.
Nonlinear stochastic static analysis is carried out for the deflection of main span girder of a self-anchored suspension bridge by response surface method （RSM）. The law of main span girder＇s deflection is researched with the variation of structural parameters such as material properties, geometric dimensions and external loads, ect. The response surface function does not contain the quadratic cross items. In the finite element（FE） model nonlinear mechanics behaviors of the structure are considered including main cable＇s geometric nonlinear and P-A effect of tower as well as girder. The results ob- tained from RSM and FEM proved that the RSM is applicable to predict the structural nonlinear re- sponse for self-anchored suspension bridges. It is concluded that the variation of the area and modulus of the main cable and area of the girder have significant effect on the deflection of girder, and the vari- ous weight of vehicle axles has different effect on it.
出处
《武汉理工大学学报（交通科学与工程版）》
2010年第2期266-269,共4页
Journal of Wuhan University of Technology（Transportation Science & Engineering）
基金
福建省教育厅科技项目(批准号:JA08015)
福州大学博士后基金项目资助
关键词
自锚式悬索桥
挠度
非线性
随机静力分析
响应面法
self-anchored suspension bridges
deflection
nonlinear
stochastic static analysis
re- sponse surface method
