Abstract
In this paper the author presents the results of experiments with the three steel grades under thermal conditions of the standard fire with account of the change of stress in steel samples, similar to changes of stress in the reinforcement, resulting from redistribution of bending moments. The major purpose of the experiments was to find out whether it would be possible to take into account the redistribution of bending moments of reinforced concrete members by the method developed by the author for determining the critical temperature and the time till failure of reinforcement of the concrete bended members.
Highlights
None of the analytical methods available for determining the fire resistance of reinforced concrete structures accounts for redistribution of the internal forces resulting from high temperatures.Redistribution of bending moments is not taken into consideration in the method advanced by the author [1,2,3,4,5,6] for determining the critical temperature for the reinforcement and the time till failure of reinforced concrete slabs
In this paper the author presents the results of the studies on St3, 1802 and 34GS steel grades under thermal conditions of the standard fire with an account of the change in stresses in steel samples similar to the reinforcement stress changes resulting from redistribution of bending moments
The aim was to find out whether it would be possible to account for the redistribution of stress level in the reinforcement of flexural reinforced-concrete members by the author's developed method for determining critical temperature and the time till failure of the reinforcement under standard fire conditions
Summary
None of the analytical methods available for determining the fire resistance of reinforced concrete structures accounts for redistribution of the internal forces resulting from high temperatures. Redistribution of bending moments is not taken into consideration in the method advanced by the author [1,2,3,4,5,6] for determining the critical temperature for the reinforcement and the time till failure of reinforced concrete slabs. This effect occurs in most elements subjected to bending, eg beams, transoms, slabs, etc. In this paper the author presents the results of the studies on St3, 1802 and 34GS steel grades under thermal conditions of the standard fire with an account of the change in stresses in steel samples similar to the reinforcement stress changes resulting from redistribution of bending moments
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