考虑索穹顶结构构形变化的空气动力失稳分析

对于具有高柔、大跨、轻质等特点的索穹顶结构来说，风力是主要的荷载。由于结构与风力的气动耦合作用，结构易产生一种失稳式振动，即 驰振。据此采用了用体型系数表达的、考虑风荷载竖向分力的气动力模型；针对索穹顶结构强几何非线性的特点和弛振分析气动力准确定常的基本假设，提出了用迭代思想求解结构驰振临界风速的方法；并与用数值积分方法和Newton-Raphson方法相结合的时程分析法的结果进行比较。

Research on Aerodynamic Instability of Cable- dome Structure Considering Transformation of Structure

Wind force is one of the most important load of cable-dome,which is tensile,long-span and lightweight.The structure is susceptible to wind and easily leading to aerodynamic instability,galloping.Aerodynamic force includes the vertical unit of wind force and is expressed in terms of pressure coefficient.Considering the evident geometrical nonlinearity of cable-dome and the supposition that aerodynamic force is constant,a new method is put forward to calculate the critical wind velocity.The results are verified by the conclusion of an analysis method in time domain,which combines numerical integration method with Newton-Raphson method.