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Symbols. For the purpose of this Part 1-2, the following symbols apply, in addition to those given in EN 1991-1-1 and EN 1991-1-2:
For the purpose of this Part 1-2, the following symbols apply, in addition to those given in EN 1991-1-1 and EN 1991-1-2:
E 30 or member meeting the integrity E 60,..., criterion, E, for 30, or 60 … minutes in standard fire exposure.
I 30 or member meeting the thermal I 60,..., insulation criterion, I, for 30, or 60... minutes in standard fire exposure.
M 90 or member meeting the mechanical M 120,..., resistance criterion, M, for 90, or 120 … minutes after standard fire exposure when mechanical impact applied.
R 30 or member meeting the load bearing R 60,..., criterion, R, for 30, or 60 … minutes in standard fire exposure,
A total area of masonry A m surface area of a member per unit length; A m surface area of a member per unit length; Ap area of the inner surface of the fire protection material per unit length of the member; Aθ 1 area of masonry up to temperature θ 1;
Aθ 2 area of masonry between temperatures θ 1 and θ 2; c constant obtained from stress strain tests at elevated temperature (with subscripts)
ca specific heat capacity of masonry;
ct combined thickness of webs and shells (given as a percentage of the width of a unit) eΔ θ eccentricity due to variation of temperature across masonry;
fb characteristic unit strength
design compressive strength of masonry at less than or equal to θ 1;
design strength of masonry in compression between θ 1 and θ 2 °C;
hef effective height of the wall l length at 20°C; lF length of a wall for a period of fire resistance
NEd design value of the vertical load;
design value of the resistance in fire;
NRk characteristic value of vertical resistance of masonry wall or column; nvg no value given;
tF thickness of a wall for a period of fire resistance; tfi, d time of fire classification (eg 30 minutes) for a standard fire in accordance with EN 1363;
tFr thickness of the cross-section whose temperature does not exceed θ 2 α proportion of load on a wall;
α t coefficient of thermal expansion of masonry; ε T thermal strain; γ Glo a safety factor for use in fire tests;
Δ t time interval; η fi reduction factor for design load level in the fire situation;
θ 1 temperature up to which the cold strength of masonry may be used;
θ 2 temperature above which any residual masonry strength is ignored;
λ a thermal conductivity;
μ 0 degree of utilisation at time t = 0.
ρ gross dry density of the masonry units, measured in accordance with EN 772- 13.
Розділ 2. Основи проектування
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