Seismic Response of Base-Isolated Reinforced Concrete Water Storage Tanks. I: Lrb Isolation System

Abstract eng:
This paper shows the seismic response of base-isolated circular cylindrical reinforced concrete (RC) water storage tanks with lead rubber bearing (LRB) under uni- and bi-directional horizontal earthquake ground motions. For the seismic analysis, tanks were considered to have a linear elastic behavior, the tank-water interaction was represented by an equivalent mechanical model, and the hysteretic behavior of the isolation system was represented by a bi-axial hysteretic restoring force model. The parameters of this study are: the water-height/tank-inner-radius ratio, the tank-wall-thickness/tank-innerradius ratio, the damping ratio of the isolation system, the target vibration period of the isolation system, and the strength ratio of the isolation system. Twenty-one pairs of selected and scaled ground motions were used. Time-history analysis was used to study the effect of bi-directional ground motion, as well as the effects of study parameters on seismic response of base-isolated RC water storage tanks. Seismic responses of base-isolated systems, when compared to fixed-base systems, show an effectiveness of LRB isolation system in the reduction of base shear values in the order of 14% to 74% for H/R = 0.5; of 47% to 83% for H/R = 1.0; of 73% to 91% for H/R = 2.0 (where H/R is the water-height/tank-inner-radius ratio). The effects of frictional pendulum system (FPS) are studied in a companion paper.

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