EXPERIMENTAL INVESTIGATION OF TIME-AND TEMPERATURE-DEPENDENT STABILITY OF STEEL COLUMNS IN FIRE

摘要

This paper describes the problem of creep buckling that arises when structural steel columns are exposed to fire temperatures.Experimental evidence is presented to show the effect of thermal creep of structural steel on the buckling capacity of steel columns at 600 °C.Analytical and computational predictions of the time-dependent buckling of steel columns subjected to fire are also presented and evaluated against expremintal results.Both analytical and computational methods utilize material creep models for ASTM A992 steel developed by the authors.Predictions from this study are also compared with those from Eurocode 3 and the AISC Specification.Results from presented work clearly show that buckling of steel columns at elevated temperatures is highly time-dependent.