Local stability of normal and high strength steel plates at elevated temperatures

• Behaviour and design of high strength normal steel plates in fire are investigated. Advanced nonlinear finite element models able to mimic the local buckling response at elevated temperatures developed validated using results from experiments. New rules for assessment high-strength normal- established. Proposed lead improved accuracy relative current provided EN 1993–1-2 prEN 1993–1-2. Accuracy, safety reliability proposed verified against extensive numerical data. This paper presents an investigation into behaviour temperatures. The considered grades include S690 S460 as well S355, S275 S235 taken consideration. Shell created their fire, whose is experimental literature. Extensive parametric studies then carried out by means models, taking account different plate slendernesses, temperature levels, edge boundary conditions grades. provisions European structural standard its upcoming version consideration It observed that existing given both rather scattered estimations strengths cross-section classification effective width equations ultimate predictions developed. High demonstrated.