Abstract: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.
