Optimization of intelligent isolation structure under the action of coupling earthquake

Abstract

In order to improve effect of vibration reduction and expand application range of sliding base-isolation structure and study the influence of the action of coupling earthquake to vibration control structure, an intelligent isolation structure with MRDs and sliding devices is put forward. The theory of intelligent isolation structure under the action of coupling earthquake is studied. A dynamic differential equation is developed. Seismic response analysis of 6-storey intelligent isolation structure are processed compared with sliding base-isolation structure, the results by exemplification show that the peak values of relative acceleration, relative displacement and inter-storey shear force of intelligent isolation structure are reduced. Comparison of the results of dynamic analysis show that various seismic responses of intelligent isolation structure under various loading condition get better control than sliding base-isolation structure; the control effect of the third hybrid scheme is the best. The seismic responses of intelligent isolation structure increases in different degree under the action of coupling earthquake. The increments increase with the action of earthquake in vertical direction increasing. In view of that SGA has such frequent shortcomings as premature convergence, oscillation and over-randomization in iterative process, a new genetic operator named transgenic operator had been developed for the purpose of improving SGA. Moreover, a Fibonacci algorithm is proposed and combined with IGA. The parameters and layout optimization model for intelligent isolation structure is set up. The various earthquake responses of intelligent isolation structure get better control after it is optimized with IHGA. The results by exemplification show that IHGA is an efficient optimal method for parameters and layout optimization of intelligent isolation structure.