What are the controlling LRFD load combinations for dead and floor live load?

1) 1.4 (D + F)

2) 1.2 (D + F + T) + 1.6 (L + H) + 0.5 (Lr or S or R)

3) 1.2D + 1.6 (Lr or S or R) + ((0.5 or 1.0) * L or 0.8W)

4) 1.2D + 1.6W + (0.5 or 1.0) * L + 0.5 (Lr or S or R)

5) 1.2D + 1.0E + (0.5 or 1.0) * L + 0.2S

6) 0.9D + 1.6W + 1.6H

7) 0.9D + 1.0E + 1.6H

Explanation:

Load and Resistance Factor Design

there are 7 basic load combination of LRFD that is

1) 1.4 (D + F)

2) 1.2 (D + F + T) + 1.6 (L + H) + 0.5 (Lr or S or R)

3) 1.2D + 1.6 (Lr or S or R) + ((0.5 or 1.0) * L or 0.8W)

4) 1.2D + 1.6W + (0.5 or 1.0) * L + 0.5 (Lr or S or R)

5) 1.2D + 1.0E + (0.5 or 1.0) * L + 0.2S

6) 0.9D + 1.6W + 1.6H

7) 0.9D + 1.0E + 1.6H

and

here load factor for L given (*) mean it is permitted = 0.5 for occupancies when live load is less than or equal to 100 psf

here

D is dead load and L is live load

E is earth quake load and S is snow load

W is wind load and R is rain load

Lr is roof live load