水平荷载作用下空腹巨型框架受力性能研究

Research on Behaviors of Hollow Huge-frame Structures under Horizontal Load Actions

根据截面惯性矩相等的原则,推导了空腹巨型框架等效截面高度系数以及材料用量比。以12层巨型框架为例,对比计算了实腹结构与空腹结构的自振周期、振型及位移、内力,并探讨了刚域与次框架对结构受力性能的影响。结果表明,空腹巨型框架结构自振周期较小,抗侧移刚度提高,侧移较小,且抗侧移刚度、侧移与内力突变较小,有利于增加使用空间,节省材料;刚域使得结构自振周期减小,侧移减小,次框架的存在大幅度地减少了结构侧移。

The equivalent section height coefficient and the ratio of material dosage of the hollow huge-frame structures were deduced based on the equal section inertia. A twelve floor huge-frame structure is taken as an example to contrast the free vibration period, the vibration model, the lateral displacement and the internal force of hollow huge-frame structure to those of solid huge-frame structure, and the influence of the frigid zone, and the hypo-frame on the structural behaviors is discussed. It is shown that the free vibration period decreases, the structural rigidness increases, the lateral displacement decreases; and the mutation of the rigidness, the lateral displacement, and the internal force decreases, and the use of space increases, and the material dosage decreases when the hollow mage-frame structures is used. The frigid zone made the structural free vibration period decrease, the lateral displacement decrease, and the hypo-frame made the lateral displacement decrease evidently.