Seismic analysis of base-isolated liquid storage tanks

Shrimali, Mahendra Kumar; Jangid, R. S.

doi:10.1016/s0022-460x(03)00749-1

Cited by 92 publications

(44 citation statements)

References 17 publications

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“…(2)- (4) for modeling of liquid storage tank are taken from Shrimali and Jangid (2004) derived by curve fitting of from the charts given by Haroun (1983) for t h /R = 0.004. The similar equations can also be worked out for other t h /R ratios.…”

Section: Modeling and Idealizationmentioning

confidence: 99%

“…Shrimali and Jangid (2002) investigated the seismic response of liquid storage tanks isolated by lead-rubber bearings under bi-directional earthquake excitation and observed that the seismic response of isolated tanks is insensitive to interaction effect of the bearing forces. Shrimali and Jangid (2004) presented the earthquake analysis of base-isolated liquid storage tanks using linear theory of base isolation. Jadhav and Jangid (2006) investigated the seismic response of liquid storage tanks isolated by elastomeric bearings and sliding systems under near-fault ground motions and observed that both elastomeric and sliding systems were effective in reducing the earthquake forces of the liquid storage tanks.…”

Section: Introductionmentioning

confidence: 99%

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Variable friction pendulum system for seismic isolation of liquid storage tanks

Panchal

Jangid

2008

Nuclear Engineering and Design

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Section: Modeling and Idealizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Variable friction pendulum system for seismic isolation of liquid storage tanks

Panchal

Jangid

2008

Nuclear Engineering and Design

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“…Several researchers reported the catastrophic failure of liquid storage tanks during past earthquakes, leading to loss of human lives as well as massive economic loss (Haroun 1983a;Rammerstorfer et al 1990). To safeguard such important structures against devastating earthquake, base isolation is considered as an efficient technique (Kelly and Mayes 1989;Jangid and Datta 1995a;Malhotra 1997;Deb 2004;Shrimali and Jangid 2004;Matsagar and Jangid 2008). Several international design guidelines (AWWA D-100-96 1996;EN 1998EN -4 2006API 650 2007;AIJ 2010) are available which take into account the seismic action for analysis and design of liquid storage tanks deterministically.…”

Section: Introductionmentioning

confidence: 99%

Reliability of Base-Isolated Liquid Storage Tanks under Horizontal Base Excitation

Saha

Matsagar

2014

Numerical Methods for Reliability and Safety Assessment

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Reliability of base-isolated liquid storage tanks is evaluated under random base excitation in horizontal direction considering uncertainty in the isolator parameters. Generalized polynomial chaos (gPC) expansion technique is used to determine the response statistics, and reliability index is evaluated using first order second moment (FOSM) theory. The probability of failure (p f ) computed from the reliability index, using the FOSM theory, is then compared with the probability of failure (p f ) obtained using Monte Carlo (MC) simulation. It is concluded that the reliability of broad tank, in terms of failure probability, is more than the slender tank. It is observed that base shear predominantly governs the failure of liquid storage tanks; however, failure due to overturning moment is also observed in the slender tank. The effect of uncertainties in the isolator parameters and the base excitation on the failure probability of base-isolated liquid storage tanks is studied. It is observed that the uncertainties in the isolation parameters and the base excitation significantly affect the failure probability of base-isolated liquid storage tank.

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“…Shrimali and Jangid (2003) investigated earthquake response of elevated liquid storage steel tanks isolated by the linear elastomeric bearings under real earthquake ground motion. Shrimali and Jangid (2004) presented the earthquake analysis of baseisolated liquid storage steel tanks using linear theory of base isolation. Jadhav and Jangid (2006) investigated the seismic response of liquid storage steel tanks isolated by elastomeric bearings and sliding systems under near-fault ground motions and observed that both elastomeric and sliding systems were effective in reducing the earthquake forces of the liquid storage tanks.…”

Section: Introductionmentioning

confidence: 99%

Seismic response of liquid storage steel tanks with variable frequency pendulum isolator

Panchal¹,

Jangid

2011

KSCE J Civ Eng

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The seismic response of liquid storage steel tanks (slender and broad) isolated with Variable Frequency Pendulum Isolators (VFPIs) is investigated under normal component of six near-fault ground motions. The continuous liquid mass is lumped as convective mass, impulsive mass and rigid mass. The corresponding stiffness associated with these lumped masses is worked out depending upon the properties of the tank wall and liquid mass. The frictional forces mobilized at the interface of the VFPI are assumed to be velocity independent. The governing equations of motion of liquid storage steel tanks isolated with the VFPIs are derived and solved in the incremental form using Newmark's step-by-step method assuming linear variation of acceleration over small time interval. For comparative study, the seismic response of liquid storage steel tanks with the VFPIs is compared with that of the same liquid storage steel tanks isolated using the Friction Pendulum Systems (FPSs). In order to measure the effectiveness of isolation system, the seismic response of isolated steel tanks is compared with that of the non-isolated steel tanks. Further, a parametric study has been carried out to critically examine the behaviour of liquid storage steel tanks isolated with VFPIs. The important parameters considered are the friction coefficient of the VFPI, the Frequency Variation Factor (FVF) of the VFPI and the tank aspect ratio. The difference between the liquid storage tanks isolated with the VFPI and the FPS isolators subjected to the harmonic and far-field ground motions was also investigated in this study. Effect of vertical component of ground motions on the behaviour of the VFPI-isolated liquid storage tanks is investigated under triaxial ground excitations by considering the interaction of forces in two orthogonal directions. From these investigations, it is concluded that seismic response, viz. the base shear, the sloshing displacement and the impulsive displacement, of liquid storage steel tanks during near-fault ground motions can be controlled within a desirable range with the installation of the VFPI. Under strong harmonic excitations, the base shear of the VFPI reduces than that of the FPS whereas the sloshing displacement, the impulsive displacement and the isolator displacement of the VFPI exceeds than that of the FPS. It is also found that the isolation by the FPS and VFPI isolators has almost the same effect in the tank to the far-field ground motions. The triaxial ground motions have noticeable effect on the response of the VFPI-isolated liquid storage tanks relative to unilateral ground motion and if ignored, the sliding displacement and base shear will be underestimated.

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Seismic analysis of base-isolated liquid storage tanks

Cited by 92 publications

References 17 publications

Variable friction pendulum system for seismic isolation of liquid storage tanks

Variable friction pendulum system for seismic isolation of liquid storage tanks

Reliability of Base-Isolated Liquid Storage Tanks under Horizontal Base Excitation

Seismic response of liquid storage steel tanks with variable frequency pendulum isolator

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