Calculate steel member temperature rise during fire exposure using the lumped capacitance method per Eurocode EN 1993-1-2 and ASCE/SFPE 29
Input Parameters
Results
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Steel Temperature
C
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Temperature Rise
C
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Strength Retention
%
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Time to 550C
min
Note: Section factor Hp/A is the heated perimeter divided by cross-sectional area. Higher Hp/A means faster heating. Critical temperature of 550C corresponds to ~60% strength loss. Protected steel uses insulation to slow heat transfer.
Reference
Eurocode EN 1993-1-2 / ASCE/SFPE 29
Lumped capacitance: dTs/dt = (Hp/A)*h_net/(rho_s*c_s)
Convective: hc = 25 W/m2K
Radiative: hr = epsilon*sigma*(Tf^2+Ts^2)*(Tf+Ts)
Strength reduction per Eurocode Table 3.1
Critical temperature: typically 550C for structural steel