考虑索穹顶结构构形变化的空气动力失稳分析  

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

作　　者：李芳[1] 王国砚[1] 茆会勇[1] 张相庭[1] 

机构地区：[1]同济大学工程力学与技术系,上海200092

出　　处：《同济大学学报（自然科学版）》2002年第5期609-613,共5页Journal of Tongji University:Natural Science

基　　金：国家自然科学基金重大资助项目 (5 9895 410 )

摘　　要：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NewtonWind 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.

关 键 词：索穹顶 结构构形变化 空气动力失稳分析 驰振 体型系数 

分 类 号：TU393[建筑科学—结构工程]