大跨径悬索桥空气静力和动力分析的影响因素研究

随着悬索桥跨径的增大,缆索直径以及作用在其上的风荷载、风与结构相互作用的非线性效应以及风速空间分布的非均匀性都将显著增强。以润扬长江大桥为背景,进行了缆索风荷载、风与结构相互作用的非线性效应以及风速空间非均匀分布等因素对大跨径悬索桥空气静力和动力特性影响的数值分析。分析结果表明:这些因素对大跨径悬索桥空气静力特性的影响比较大;但是对于空气动力稳定性而言,风与结构相互作用的非线性效应的影响比较显著,而其它两个因素则基本没有影响。

Influence of some factors on the aerostatic and aerodynamic analysis of long-span suspension bridges

With increasing span length of suspension bridges,the cable's diameter and also the wind load acting on it,the nonlinear wind-structure interaction and the wind speed spatial non-uniformity increase consequently,which may have an unnegligible influence on the aerostatic and aerodynamic analysis of long-span suspension bridges.Taking Runyang Bridge over the Yangtze River as an example,effects of the nonlinear wind-structure interaction,wind speed spatial nonuniformity,and the cable's wind load on the aerostatic and aerodynamic analysis of the bridge are investigated analytically.The results show that the aerostatic behavior of long-span suspension bridges is significantly influenced by these factors,but for the aerodynamic stability,it is greatly influenced by the nonlinear wind-structure interaction,and the other two factors almost have no influence on it.