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The temperature dependent stress-strain relationships of steel as initially existing in the programme Ceficoss have been tested by simulation of bending tests described in the literature. The main parameters to be considered, i.e. geometrical factors (shapes, buckling lengths), steel qualities and coefficients governing the heat exchanges, are presented. Improved stress-strain relationships for steel have been quantified and calibrated by transient state beam tests performed on small, simply supported steel beams, subjected to a concentrated constant load and a controlled temperature increase. New laws have been established for commonly used construction steels and for high strength steel FeE 460. The validity of these improved relationships has been verified by simulating six full-scale fire tests performed on unprotected steel columns. Ceficoss makes it possible to take into account a distribution of residual stresses. The simulation of the six column tests showed that residual stresses have a quite small influence on the fire resistance time of columns. It has been decided, however, to consider systematically a distribution of residual stresses in the calculations. Practical design tools have been established and are proposed in the form of tables as well as diagrams.

Additional information

Authors: SCHLEICH J B, Arbed Recherches, Esch-sur-Alzette (FR);MATHIEU J, Arbed Recherches, Esch-sur-Alzette (FR);CHANTRAIN P, Arbed Recherches, Esch-sur-Alzette (FR)
Bibliographic Reference: EUR 13516 EN (1991) 299 pp., FS, ECU 23.75
Availability: (2)
ISBN: ISBN 92-826-0592-2
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