基于正交异性壳单元的悬索桥非线性静风稳定性分析

基于正交各向异性空间壳单元的大跨度桥梁静风稳定分析方法,通过对江阴长江大桥的静风稳定分析表明,大跨度悬索桥在静风荷载作用下存在两种破坏形式,即静力扭转发散与风荷载超过结构极限承载力造成的破坏,结构的具体破坏形式可能因攻角不同而改变。通过与空间梁单元模型的比较分析表明:两种方法计算的整体变形比较一致,但传统空间梁单元模型存在一定的局限性,而壳单元法能比较全面地考虑结构的整体与局部失稳。

Nonlinear aerostatic instability analysis of suspension bridges based on orthotropic shell element models

Authors present a method based on orthotropic shell models for aerostatic instability analysis of long span bridges. Through the numerical example of Jiangyin Bridge over Yantze River, there are two kinds of aerostatic instabilities-torsional divergence and the failure due to ultimate capacity under wind action. The beam model and orthotropic shell model are in good agreement in the total deformation of the main structure,but it indicates that there are some limitations in traditional beam-element models, and orthotropic shell-element models can include the effects of global and local instability, shape deformation, and so on.