WORLD FOR CIVIL

_{LOAD & RESISTANCE FACTOR DESIGN FOR BUILDING COLUMN}

_{Plastic analysis of prismatic compression members in buildings is permitted if ( F y ) ^½ (l/r) does not exceed 800 and F u £ 65 ksi (448 MPa). For axially loaded members with b/t £ l r , the maximum load P u , ksi (MPa= 6.894 X ksi), may be computed from}

_{P u = 0.85A g F cr}

_{WhereA g =gross cross-sectional area of the member}

_{F cr =0.658 ^l F y for l £ 2.25}

_{=0.877 F y / l for l > 2.25}

_{l =(Kl / r) ² (F y / 286,220)}

_{The AISC specification for LRFD presents formulas for designing members with slender elements}