Steel Buildings in Europe

Title A.1 Simply supported, laterally unrestrained beam 5 of 7 4 – 61 M cr =   502,75 1,127 3 2 10 74,91 (74,91) 502750 281500 80770 100 788,1 199100              M cr = 113,9 kNm Non-dimensional slenderness The non-dimensional slenderness is obtained from: 1,288 113,9 235 10 804300 -6 cr pl, y y LT      M f W  EN 1993-1-1 § 6.3.2.2 (1) For rolled profiles: 0,4 LT,0   Note: the value of LT,0  may be given in the National Annex. The recommended value is 0,4. So LT,0 LT 1,288     EN 1993-1-1 § 6.3.2.3(1) Reduction factor,  LT For rolled sections, the reduction factor for lateral-torsional buckling is calculated by:          2 LT LT LT 2 LT 2 LT LT LT 1 1,0 but 1         where:     0,5 1 LT LT,0 LT LT LT 2           EN 1993-1-1 § 6.3.2.3 (1)  LT is the imperfection factor for LTB. When applying the method for rolled profiles, the LTB curve has to be selected from Table 6.5: For h / b = 330 / 160 = 2,06 > 2 Therefore use curve ‘c’ (  LT = 0,49) 0,4 LT,0   and  = 0,75 Note: the values of LT,0  and  may be given in the National Annex. The recommended values are 0,4 and 0,75 respectively. EN 1993-1-1 Table 6.5 Table 6.3     1,340 (1,288) 0,4 0,75 0,5 1 0,49 1,288 2 LT        and: 0,480 (1,288) 0,75 (1,340) 1,340 1 2 2 LT      