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The bearing capacity of steel members and their cross-sections is influenced by geometrical - dimensional and material - strength variations, which are randomly variable. The actual design standards take this into account by characteristic or nominal values yield strength, design cross-sectional dimensions and partial reliability factors of the material to ensure adequate reliability of the proposed structures. There is still insufficient knowledge of the actual geometrical and material deviations and the results ...

Many members of steel structures are subjected mostly to bending. In these members from the economical point of view is very useful to utilize also plasticity of structural steels. The elastic-plastic resistance of steel members subjected largely to bending depends in large measure on local stability of their compressed flanges and bending webs in decided cross-sections and areas. The real elastic-plastic behavior of the steel members and their bending webs and compressed flanges is complicated. Therefore, the rep...

The continued effort for economic design of steel structures leads to decrease their weight by shape and material optimization through the using of thin webs, high-strength steels and their effective combination with usual structural steels. The efficiency of high-strength steels using and their combination with usual structural steels is evident in the case of beams mostly subjected to bending loading. But from the complex optimization analyses follow, that the using of high-strength steels and their combination ...