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Abstract
The numerical investigation on the seismic response of RC elevated liquid storage tanks installed with viscous dampers is presented. A discrete two-mass model for the liquid and multi-degree of freedom system for staging, installed with the dampers are developed for Reinforced Concrete (RC) elevated liquid storage tanks. The elevated tank is assessed for seismic response reduction when provided with Linear Viscous Damper (LVD) and Nonlinear Viscous Damper (NLVD), installed in the staging. The RC elevated liquid storage tanks are analyzed for two levels of liquid containment in the tank, 100% and 25% of the tank capacity. Three Configurations of placements of dampers viz. dampers at alternate levels (Configuration I and Configuration II) and dampers at all the panels of the staging of the tank (Configuration III) are considered. To study the effect of peak ground acceleration, eight real earthquake time histories with accelerations varying from 0.1 g to 0.93 g are considered. The nonlinearity in the viscous damper is modified by taking force proportional to various velocity exponents. It is found that the nonlinear viscous dampers with lower damping constant result in a comparable reduction in the response of RC elevated liquid storage tank, to that of linear viscous dampers with higher damping constant. A lower damping constant signifies compact the size of the damper. Doi: 10.28991/cej-2020-SP(EMCE)-09 Full Text: PDF
Highlights
The seismic safety of liquid storage tanks is of prime importance, and their response should be controlled using various control strategies
The specific objectives of the present study are: (i) to evaluate the seismic response of the Reinforced Concrete (RC) elevated liquid storage tanks modeled with two- mass model of liquid and multi-degree of freedom system for staging, (ii) to study the influence of the velocity exponent, α on the effectiveness of viscous dampers with increased nonlinearity, (iii) to compare the seismic response of the RC elevated liquid storage tank installed with linear viscous dampers (LVDs) and nonlinear viscous dampers (NLVDs) subjected to eight different real earthquake ground motions; and (iv) to investigate the effect of positions of fluid viscous dampers on the response of the RC elevated liquid storage tanks
Seismic response of the RC elevated liquid storage tank with fluid viscous dampers is investigated under eight different real earthquake ground motions
Summary
The seismic safety of liquid storage tanks is of prime importance, and their response should be controlled using various control strategies. Liquid storage tanks are considered as lifeline structures and should remain functional during and after the earthquakes. Their performance during strong earthquakes is of critical concern. Due to its complex dynamics and variable liquid levels, behavior of the elevated liquid storage tank cannot be estimated by the similar approaches used in the case of the high-rise buildings. Housner (1963) [1] studied the dynamic behavior of ground supported and elevated water tank. Haroun and Housner (1982) [2]; and Haroun [3] carried out vibration studies on ground supported, deformable cylindrical water tanks; and derived parameters of the mechanical model
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