ELLIPTICAL DEFORMATION OF FLOATING ROOF PONTOON BY SECOND MODE RESONANCE

Nonlinear sloshing analysis of cylindrical liquid storage tank with single-deck type floating roof Part 2

Abstract

This paper investigates the behavior of the second mode resonance in the liquid storage tanks with the single-deck type floating roof. In the Tokachi-Oki Earthquake in 2003, the floating roof of the large-sized oil tanks received damage by sloshing. One of the reasons is considered to be elliptical deformation of the pontoon by the second mode resonance in the past report. In this paper, the behavior of the floating roof is simulated by the numerical analysis method which we propose, and the deformation and stress in the pontoon are investigated in detail. The stress of the pontoon calculated by the design method notified by the Fire Defense Agency is compared with the numerical results. By these results, the validity and the applicability of the design method are discussed.