FIRE DESIGN OF STEEL MEMBERS - Civil and Natural Resources ...

9 NOMENCLATURE:
When equations are taken from other sources, the notation listed below has been
adopted to provide consistency throughout this report.
α convective heat transfer coefficient (kW/m 2 K)
χ fi
ε
γ GA
η fi
ϕ
κ 1
κ 2
λ nt
λ n,f,,t
reduction factor for flexural buckling in fire design situations
Emissivity
partial factor for permanent actions in accidental design situations
reduction factor for the design load level
configuration factor
adaptation factor for non-uniform temperatures across the cross section
adaptation factor for non-uniform temperatures along the beam.
non dimensinal slenderness at normal temperatures
non dimensinal slenderness at elevated temperatures
ρ i density of the insulation (kg/m 3 )
ρ s density of the steel (kg/m 3 )
σ Stefan-Boltzmann constant (5.67 x 10 -8 kW/m 2 K 4 )
ψ 1,1
combination factor for frequent values.
A cross-sectional area of the steel (m 2 )
A v area of the ventilation openings (m 2 )
A t total internal surface area of the room (m 2 )
c i specific heat of the insulation (J/kg K)
c s specific heat of the steel (J/kg K)
e t fuel load (MJ/m 2 )
E d
E fi,d
design effect of actions for normal temperatures (kN, kN.m)
design effect of actions for the fire situation (kN, kN.m)
H p /A Section Factor (m -1 )
F v
f y
H p
opening factor = A v √H v /A t
yield stress (MPa)
heated perimeter of steel (m)
h c convective heat transfer coefficient (W/m 2 K)
h t total heat transfer coefficient (W/m 2 K)
h r radiative heat transfer coefficient (W/m 2 K)
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