- Ingénieur d'état
The loads combinations are combinations of load cases for which the structure is designed and checked.
On this page you can find the loads combinations for steel structure using Allowable Stress Design ASD and Load and Resistance Factor Design LRFD ready for using, generated according to ASCE 7-05 and ASCE 7-10 considering the dead loads and varying loads (live, wind and climatic) and accidental (earthquake).
Loads cases considered :
D : dead load
L : live load
Lr : roof live load
S : snow load
R : rain load
W : wind load
E : earthquake load
See also, on the next pages, the loads combinations according to:
The content of this page is available also in other language:
According to ASCE 7-05
ASD ASCE 7-05
1) D
2) D + L
3) D + (Lr or S or R)
4) D + 0.75 L + 0.75 (Lr or S or R)
5) D + (W or 0.7 E)
6) D + 0.75 (W or 0.7E) + 0.75 L + 0.75 (Lr or S or R)
7) 0.6 D + W
8) 0.6 D + 0.7 E
LRFD ASCE 7-05
1) 1.4 D
2) 1.2 D + 1.6 L + 0.5 (Lr or S or R)
3) 1.2 D + 1.6(Lr or S or R) + (ψ*L or 0.8W)
4) 1.2 D + 1.6 W + ψ*L + 0.5 (Lr or S or R)
5) 1.2 D + E + ψ*L + 0.2 S
6) 0.9 D + 1.6 W
7) 0.9 D + E
ψ = 0.5 if L ≤ 100 Psf (4.79 KN ⁄ m2)
ψ = 1.0 if L > 100 Psf (4.79 KN ⁄ m2)
ψ = 1.0 for garages or areas occupied as places of public assembly.
Note
regarding the wind case, you have always to think to consider positive and negative case, means pressure/suction loading
According to ASCE 7-10
ASD ASCE 7-10
1) D
2) D + L
3) D + (Lr or S or R)
4) D + 0.75 L + 0.75 (Lr or S or R)
5) D + (0.6 W or 0.7 E)
6) D + 0.75 L + 0.75(0.6 W) + 0.75 (Lr or S or R)
7) D + 0.75 L + 0.75(0.7 E) + 0.75 S
8) 0.6 D + 0.6 W
9) 0.6 D + 0.7 E
LRFD ASCE 7-10
1) 1.4 D
2) 1.2 D + 1.6 L + 0.5 (Lr or S or R)
3) 1.2 D + 1.6(Lr or S or R) + (ψ*L or 0.5W)
4) 1.2 D + W + ψ*L + 0.5 (Lr or S or R)
5) 1.2 D + E + ψ*L + 0.2 S
6) 0.9 D + W
7) 0.9 D + E
ψ = 0.5 if L ≤ 100 Psf (4.79 KN ⁄ m2)
ψ = 1.0 if L > 100 Psf (4.79 KN ⁄ m2)
ψ = 1.0 for garages or areas occupied as places of public assembly.
Note
regarding the wind case, you have always to think to consider positive and negative case, means pressure/suction loading
The content of this page is available also in other language:
See also, on the next pages, the loads combinations according to:
