湖南大学学报（自然科学版）2016，Vol.43Issue(3)：15-22,8.
悬索桥静风扭转发散的影响因素研究
Research of Influencing Factors on Aerostatic Torsional Divergence of Suspension Bridges
摘要
Abstract
Based on a generalized cable-girder model,it was found that the torsional stiffness degradation of the cable system was the essential reason leading to aerostatic torsional divergence of long-span suspension bridges.The effects of the deformations of the main cables and the bridge tower on the stiffness degradation of suspension bridges were investigated.Theoretical analysis indicates that vertical deformation of the main cable is critical to the torsional stiffness of the whole system.Provided that the vertical deformation of any cable reaches a critical value,the cable will loosen up to a non-stress state,which causes a sudden drop in torsional stiffness of the system.Therefore,it is stated that the sudden drop in stiffness due to the vertical deformation could be the key reason for the aerostatic torsional di-vergence of a long-span suspension bridge.Moreover,the study also shows that lateral deformation of the main cable and the horizontal relative deformation between the two tower-tops postpone the stiffness degradation,and hence en-hance the critical vertical deflection.In addition,it is shown that the effect of turbulence on torsional divergence is non-negligible,and the turbulence significantly decreases the aerostatic torsional stability of bridge structures.Numer-ical results of the Xihoumen Suspension bridge performed by nonlinear finite element simulation could be explained tentatively by the theoretical viewpoints proposed in this paper.关键词
悬索桥/刚度退化/扭转发散/有限元分析/静风/紊流Key words
suspension bridges/stiffness degration/torsional divergence/finite element analysis/aero-static/turbulence分类
交通工程引用本文复制引用
吴长青,张志田,陈政清..悬索桥静风扭转发散的影响因素研究[J].湖南大学学报（自然科学版）,2016,43(3):15-22,8.基金项目
国家自然科学基金资助项目（51178182），National Natural Science Foundation of China （）
