In order to design FRP liquid storage tanks, a dynamic earthquake load called to a short-term load should be also considered same as a internal liquid pressure called to a long-term load. Especially chemicals storage tanks become disadvantage to the earthquake load because their shapes are fabricated to oblong ones. Then the chemicals tanks are circumferentially reinforced along to the axial direction of tanks and their side wall thickness is varied from the bottom to the top of tanks. However, we don't have any clear design criteria of the variation of thickness and the circumferential reinforcement. In this paper, the FRP tanks are horizontally excited under constant sin wave acceleration and the responses of dynamic liquid pressure, accelerations and strains to the accelerated frequency are examined. Experimental results, of bulging resonance frequencies, distributions of the strains and the dynamic pressures are compared with FEM results which take account of coupling effect of fluid to structure.
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