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Title of Journal: KSCE J Civ Eng

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Abbravation: KSCE Journal of Civil Engineering

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Korean Society of Civil Engineers

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DOI

10.1016/0002-9378(88)90352-3

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1976-3808

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Seismic response of liquid storage steel tanks wit

Authors: V R Panchal R S Jangid
Publish Date: 2011/07/02
Volume: 15, Issue: 6, Pages: 1041-1055
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Abstract

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 nearfault 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 stepbystep 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 nonisolated 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 farfield ground motions was also investigated in this study Effect of vertical component of ground motions on the behaviour of the VFPIisolated 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 nearfault 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 farfield ground motions The triaxial ground motions have noticeable effect on the response of the VFPIisolated liquid storage tanks relative to unilateral ground motion and if ignored the sliding displacement and base shear will be underestimated

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