モンテカルロシミュレーションによる腐食した鋼構造物の力学性能評価

概要

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If steel structures lose their volume due to corrosion, their load carrying capacity deteriorates. The capacity loss depends on many factors such as the location, shape and degree of the local corrosion pattern. The aim of the present paper is to investigate the ultimate strength characteristics of steel plate with general corrosion patterns under axial compressive loads by Monte Carlo simulation. Corrosion wastages are supposed to follow Weibull distributions. For the simple supported steel plate under compressive load, series of non-linear finite element analyses using 3D brick elements are carried out repeatedly, varying the parameters that determine the characteristics of the distribution. As a result, it is found that residual ultimate strength varies widely even though the plates are given corrosion which follow same probabilistic parameter and the unevenness is not negligible. Considering this matter, formulas for the ultimate compressive strength that has range are proposed in this paper.
2006-11-24