Base isolation numerical analysis of vertical storage tanks with floating roof under three dimensional excitation

To reduce seismic response of vertical storage tanks under three dimensional excitation,a 15×104 m3 storage tank was selected as research object,the base isolation system was introduced,allowing the impact of floating roof.Considering the liquid-solid coupling,the finite element analysis model of floating roof storage tank was established by using ADINA.The seismic response of vertical storage tank was analyzed by using Newmark numerical method.Results show that as the inertia mass,the floating roof can effectively control the sloshing wave height,but the base isolation can not effectively control the sloshing wave height.The sloshing wave height is not affected by bi-dimensional and three-dimensional excitation,thus it can be calculated as single dimensional seismic action.The three-dimensional earthquake action should be considered in vertical storage tank earthquake resistance design because of its maximum response under three-dimensional excitation.The base isolation has not significant control effect on the aspects of dynamic pressure and stress of floating roof.