9. Elasto-Plastic Analysis of the Distribution of Ore Pressure on Longitudinal Bulkheads in an Ore Carrier

概要

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The Coulomb theory for soil mechanics fails to give exact estimates for ore pressure on longitudinal bulkheads in an ore carrier subjected to wave loads, because this theory stands on the basis of the assumption of perfectly plastic states while ore in a hold behaves as an elasto-plastic continuum in this situation. In this paper, stress analysis of the ore field is carried out with the aid of the elasto-plastic constitutive equation proposed herein on the basis of the yield criterion of Drucker and Prager^<l)>. In the case of ore carriers, behaviors of ore depends largely upon the rigidity of structures and external loads. Therefore, the fields of ore and structures should be analyzed as one system, and it can be easily performed with the aid of the finite element method. Finally the theoretical results obtained are compared with the experiments performed by Ando^<2,3)>, and it shows good agreements.
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