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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
For a cable dome structure with high flexibility, large span and light weight, the wind load is the main load and due to the aerodynamic coupling between the structure and the wind force, the structure is prone to destabilizing vibration, ie, galloping. The aerodynamic model considering the vertical component of the wind load is used to describe the aerodynamic model with the vertical component of the wind load. In view of the strong geometric nonlinearity of the cable dome structure and the basic assumptions of the quasi-stationary aerodynamic analysis of the relaxation vibration, Vibration critical wind speed method; and numerical integration method and Newton-Raphson method combined with the results of time-history analysis