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Mahmudur Rahman,Yoshiaki Okui,Muhammad Atif Anwer 한국강구조학회 2018 International Journal of Steel Structures Vol.18 No.4
Stiff ened plates with high slenderness parameters show large out-of-plane defl ections, due to elastic buckling, which may occur before the plates reach their ultimate strength. From a serviceability point of view, restriction of out-of-plane defl ections exceeding the fabrication tolerance is of primary importance. Compressive strength at the serviceability limit state (SLS) for slender stiff ened plates under uniaxial stress was investigated through nonlinear elasto-plastic fi nite element analysis, considering both geometric and material nonlinearity. Both normal and high-performance steel were considered in the study. The SLS was defi ned based on a defl ection limit and an elastic buckling strength. Probabilistic distributions of the SLS strengths were obtained through Monte Carlo simulations, in association with the response surface method. On the basis of the obtained statistical distributions, partial safety factors were proposed for SLS. Comparisons with the ultimate strength of diff erent design codes e.g. Japanese Code, AASHTO, and Canadian Code indicate that AASHTO and Canadian Code provide signifi cantly conservative design, while Japanese Code matches well with a 5% non-exceedance probability for compressive strength at SLS.
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