Journal of Seismology and Earthquake Engineering

Journal of Seismology and Earthquake Engineering

Analytical Evaluation of Seismic Sloshing Reduction by Suspended Annular Baffle (SAB) in Cylindrical Floating Roof Liquid Storage Tanks

Document Type : Structural Earthquake Engineering

Authors
Mahmood Hosseini
Amirhossein Soroor
IIEES
Abstract
Sloshing has been known as the main cause of seismic damages to floating roof oil tanks in past earthquakes. In a previous study, conducted by the authors, the employment of a Suspended Annular Baffle (SAB) was introduced as a countermeasure for seismic sloshing reduction, and its efficiency was shown through a series of laboratory tests by shake table on a small cylindrical tank subjected to harmonic excitations with various amplitude and frequencies as well as seismic excitations using input earthquakes. In the present study, an analytical formulation has been developed for obtaining the dynamic response of floating roofs, subjected to sloshing, with and without SAB, based on velocity potential function and Lagrange equations of motion. To show the validity of the analytical solution, the results have been compared with those of the laboratory tests. Comparisons show that the presented analytical formulation is in good agreement with experimental study, so that the prediction of the maximum sloshing heights in cases of harmonic and seismic excitations can be done with more than 95% and 90% precision respectively.
Keywords
Earthquake induced sloshing
Floating roof tanks
Suspended Annular Baffle (SAB)
Shaking table test
Convective damping ratio
Seismic passive control in cylindrical tank
Swirling of the floating roof
Lagrange equations
Velocity potential function
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  • Receive Date 13 August 2018
  • Accept Date 26 December 2020
  • Publish Date 01 January 2018