脉动风载下新型建筑结构顶层动力响应控制研究

提出影响新型建筑结构中巨、子结构顶层动力响应的两个重要因素——附加柱刚度与附加阻尼。综合研究了脉动风作用下附加柱刚度与附加阻尼对巨、子结构顶层侧移及加速度响应的影响。研究结果表明:结构具备一定附加阻尼的情况下,附加柱刚度越小,子结构调频减震功效越好,巨、子结构侧移响应越小;但是附加阻尼接近于0且附加柱刚度很小时,巨、子结构顶层动力响应很不稳定,甚至会突然增大,结构设计中应避免这种情况;此外,附加柱刚度较小时,结构响应受附加阻尼变化的影响非常大,同样,当附加阻尼较小时,结构响应受附加柱刚度变化影响也非常大,当附加阻尼比较大或附加柱刚度较大时,两者的相互影响不再明显。

Control of Dynamical Response at the Top of the Innovative Building Structure under Random Wind Loads

Two important parameters,additive column and additive damping,which affect dynamical performance of the innovative mega-structure for buildings,are presented.Effect of additive column and additive damping on dynamical responses of the mega-structure subjected to wind loads is synthetically investigated.Researching results indicate:displacement responses of the mega-structure are controlled better as stiffness of additive column becomes less,when a certain additive damping exists in the innovative structure.However,once additive damping reaches to zero,the dynamical responses of the innovative structure with little stiffness of additive column will be suddenly enlarged.Moreover,mutual effect between additive column and additive damping is weaken as the two parameters increase.