Fire Severity Calculator

Calculate equivalent time of fire exposure and fire severity for performance-based structural fire design per Eurocode EN 1991-1-2

Input Parameters

Results

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Equivalent Time (te,d)
min
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Opening Factor (O)
m^0.5
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Thermal Inertia Factor (kb)
--
Estimated Peak Temperature
C
Note: Equivalent time converts a real fire scenario to an equivalent duration of standard fire (ISO 834) exposure. This allows comparison of actual fire severity with prescriptive fire ratings. Used in performance-based structural fire engineering.

Reference

Eurocode EN 1991-1-2 Annex F - Equivalent Time of Fire Exposure te,d = qf,d * kb * wf O = Av*sqrt(heq)/At (opening factor, 0.02-0.2 m^0.5) kb = thermal inertia conversion factor (~0.07 for concrete) wf = ventilation factor (function of opening ratio) Parametric fire: T = 20 + 1325*(1 - 0.324*e^(-0.2t*) - 0.204*e^(-1.7t*) - 0.472*e^(-19t*))