Optimal Design Method of Base-Isolated Liquid Storage Tank Using Tuned Viscous Mass Damper Based on Genetic Algorithm

Abstract eng:
Liquid storage tank is a kind of important infrastructure and it should not be damaged in seismic event. Conventional base-isolated technique can effectively reduce the base shear of the liquid storage tank, but usually cause the base displacement and the sloshing wave height amplified. In order to improve the seismic performance, a tuned viscous mass damper (TVMD) is applied to the base-isolated liquid storage tank in this study. For determining the optimal parameter values of TVMD, an optimal design method based on genetic algorithm (GA) is proposed and the corresponding flow chart is given. In the optimal process, the stiffness ratio, mass ratio and damping ratio are selected as decision variables of GA in the mathematical optimization model of the base-isolated tank with a TVMD. Considering the normal working and safety of the base-isolated tank with a TVMD under seismic event, the base displacement is taken as the optimal object in GA. The result shows that the proposed optimal procedure possesses high efficiency to obtain optimal solutions, with the advantage of parallel computation, global searching and strong robustness of GA. By performance analysis based on the optimal results, it is proved that base-isolated liquid storage tank by using a TVMD can not only reduce the base displacement and base shear significantly, but also decrease the sloshing wave height which is difficult to control using conventional baseisolated technology. At last, parametric studies are conducted by using the time history analysis method and the effects of parameters (the stiffness ratio, the mass ratio and damping ratio) on seismic response are investigated. Because the proposed optimal design method is general, it can also be used to solve other optimal questions of isolated structure.

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