双向地震波作用下巨子型有控结构建筑的隔震设计

为了增强巨子型有控结构建筑的动力特性,提升其稳定性,设计双向地震波作用下建筑有控结构。采用3种磁流变阻尼器(MRD)与滑移隔震混合控制结构构成单体建筑有控结构,其包括巨结构和子结构,并建立该有控结构的动力分析模型。在动力分析模型中输入水平和竖向地震,得到模型的竖向和水平滑动状态运动微分方程,依据这两个方程采用自适应模糊神经网络优化动力分析模型,构建优化模型。从优化模型出发,通过实例实验分析得出,优化设计双向地震波作用下建筑有控结构时,在其上部结构层间和隔离层各安装一个MRD,可确保优化设计后的有控结构在不同双向地震工况下的地震反应控制效果最佳,且有控结构在双向地震工况2下,结构第一层、中间三层以及顶层的加速度和位移的时程曲线走向一致,且差距微小;同时有控结构的巨结构顶层侧移响应随着子结构刚度增加而提高,动力特性没有明显的变化,子结构随着其自身刚度增加顶层侧移响应表现稳定,子结构动力特性增强。

Seismic Isolation Design of Mega-sub ControlledStructures under Bidirectional Seismic Wave

To strengthen the dynamic characteristics and stability of mega-sub controlled structure buildings, an individual controlled structure building under the action of bidirectional seismic wave is designed by using three kinds of magneto-rheological dampers (MRDs) and sliding base isolation. A dynamic analysis model of the controlled structure is then established. On the basis of the input of horizontal and vertical earthquakes to the dynamic analysis model, the differential equations of motion in the vertical and horizontal sliding states of the model are obtained. In accordance with the two equations, the adaptive fuzzy neural network is used to optimize the dynamic analysis model, and an optimization model is constructed. Experimental analysis of an example indicated that installing one MRD between the layers and one MRD in the isolation layer of the superstructure can ensure the best seismic response control effect for the controlled structure under different bidirectional seismic wave conditions. The time history curves of acceleration and displacement at the first floor, the middle three floors, and the top floor of the controlled structure have the same trend under condition 2, with a small difference. The lateral displacement response of the top floor of the megastructure increases with the increase in the stiffness of the substructure, and the dynamic characteristics do not change obviously. With the increase in its own stiffness, the lateral displacement response of the top floor of the substructure is stable and the dynamic characteristics of the substructure are enhanced.