Fire design of steel structures

Design effects of actions in fireThe accidental combination and the ψ_2,1Q₁ value recommended by EN 1991-1-2. Fire resistance classesWhat R 30-R 120 means and what the ISO 834 standard curve looks like. Critical temperature of steelWhat it is, how to calculate it from the degree of utilisation μ₀ and reference values. Reduction factors for steel in fireTable 3.1 (k_y,θ, k_E,θ) and χ_fi values.

Cross-section classes in fireReduced ε and the c/t limits for S235-S460. Section factor and fire protectionHeating of unprotected and protected steel and the required protection thickness. Heating of unprotected steelTimes to reach the critical temperature under ISO 834, by section factor. Fire protection boards or spraysThermal properties and thicknesses compared for R 30-R 120.

Fire design of steel columnsBuckling in fire and the buckling length ℓ_fi. Fire design of steel beamsBending, lateral-torsional buckling with M_cr and shear. Worked example: HEB 300 column for R 90A full check, step by step, up to the protection thickness.

Online calculator for a steel member in tension in fireTension member: μ₀, critical temperature, time and protection. Steel column fire design calculatorBuckling about both axes, with the HEB 300 example for R 90. Steel beam fire design calculatorBending, lateral-torsional buckling and shear, with an IPE 300 example. Online calculator for members in compression and bending in fireN-M interaction to cl. 4.2.3.5, with an HEB 240 example. Validation against published literatureWorked examples from three published references, mainly Franssen and Vila Real, plus more than 10,000 automated test cases.