火災時における無被覆鋼材の温度上昇簡易予測式

概要

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A simple formula has been developed to calculate the temperature rise of unprotected steel elements during fire. The formula includes the effect of steel heat capacity through section factor H_S/A_S, where H_s is the heated perimeter length of cross section, A_s is the cross sectional area. To derive the formula, a series of fire resistance tests were conducted for H-sectioned columns, box columns and H-sectioned beams of various cross section sizes. The measured steel temperature histories were fitted with exponential curves to obtain the steel temperature rise coefficient (inverse of time constants of temperature rise). Good correlation was obtained between the section factors and the steel temperature rise coefficients for respective categories of steel shapes.
2002-03-30