engleski

Testing the acceptability of different creep strain calculation models in structural fire analysis

This paper investigates the accuracy of a selection of creep models in predicting the structural behaviour of steel under various heat rates and load ratios. Most of the commonly-used stress strain laws of steel for structural fire engineering have already implicitly considered the creep strain, however, these considerations cannot adequately capture the effects of the stress level, heat rate and strain rate on the creep strain of the steel. In this paper, several available creep models were implemented into the finite element code-Vulcan and the acceptability of these creep models was tested by the comparisons with published experimental results. In order to introduce an explicit creep model into the structural fire analysis, the substantial implicit creep should be removed from the initial material laws. A practical way to obtain the creep-free material curves from established material laws is proposed and it has been demonstrated that the combination of an creep-free stress strain curve with an explicit creep model can improve the accuracy of the prediction of the creep strain of steel in fire.

Steel; fire; creep strain; numerical model

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