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Rankine-Merchant Approach to Specification of Flexural Buckling Coefficient for Fire Situation



Author(s)

Mariusz Maślak

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DOI:10.17265/1934-7359/2012.10.005

Cracow University of Technology, Cracow 31-155, Poland

An alternative design technique of the evaluation of flexural buckling coefficient determined for fire situation is presented
and widely discussed in the present paper. The proposed methodology is based on the Rankine-Merchant concept. An equivalent buckling coefficient is adopted as the objective measure of the reduction of member fire resistance. It is specified as a product of classical coefficient which deals only with buckling phenomenon and the ratio of the reduction of steel yield point at fire temperature. Some calculation formulae, differentiated in relation to model complexity, are recommended to reliably assess the value of searched coefficient. Obtained results are compared with adequate buckling factors resulting from typical standard analysis. Moreover, a quantitative comparison is shown here, in which the influence on conclusive resistance of some factors being the indirect effect of the consideration of imperfect structural members is examined in detail.

Buckling coefficient, Rankine-Merchant approach, fire situation.