索膜结构的抖振动力特性研究
ON BUFFETING DYNAMIC PROPERTIES OF MEMBRANE STRUCTURES
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摘要: 研究了索膜结构在脉动风作用下的动力特性.采用Wilson-θ(逐步积分法和Newton-Raphson迭代法推导了索膜结构在抖振力作用下的非线性动力增量平衡方程,求得结构的时程响应曲线.通过实例分析,探讨了结构参数变化对自振频率的影响;研究抖振力作用下索膜结构响应的频谱特性,从而得出索膜结构的抖振响应特性.Abstract: A time domain method is developed to study buffeting dynamic properties of cable membrane structures under turbulent wind loads. Nonlinear dynamic equilibrium equations of cablemembrane structures under buffeting forces are derived and dynamic responses of such structure in time domain are obtained by Wilson-θ integral and Newton-Raphson method. Examples are provided to study the buffeting dynamic properties of membrane structures. The effects of structural parameters on frequencies of free vibrations of membrane structures are discussed. Frequency spectral properties of buffeting responses are analyzed and properties of buffeting responses for cablemembrane structures under buffeting forces are obtained.