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21 January, 12:15

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

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  1. 21 January, 12:44
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    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
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