Steel Buildings in Europe

Title APPENDIX D Worked Example: Design of portal frame using elastic analysis 37 of 44 4 - 118 For Class 3 check, determine  :  = 346 31  =  0,09 Considering section 1 parallel to column flange, the depth of web excluding root radius is: c w = 503 17 , 2 24   = 461,8 mm w w t c = 11,1 461,8 = 41,6 190 210 11,1 9,4 503 450 14,6 14,6 17,2 461,8 51,6 E.N.A Z = 451,4 _ EN 1993-1-1 Table 5.2 For    1, the limit for Class 3 is: EN 1993-1-1 Table 5.2   0, 67 0,33 42  =   0, 67 0,33 0, 09 42 0,81    = 53,1 w t c = 41,6 < 53,1  The web is Class 3 8.1.2. The flanges Top flange f t c = 14, 6 69,3 = 4,7 The limit for Class 1 is : 9 ε = 9  0,81 = 7,3 Then : f t c = 4,7 < 7,3  The top flange is Class 1 EN 1993-1-1 Table 5.2 (Sheet 2) Bottom flange f t c = 17, 2 75, 45 = 4,4 The limit for Class 1 is : 9 ε = 9  0,81 = 7,3 f t c = 4,4 < 7,3  The bottom flange is Class 1 Therefore the overall section is Class 3.