Steel Buildings in Europe

Part 10: Technical Software Specification for Composite Beams 10 - 26 6.3.4 Shear buckling resistance When the web slenderness h w / t w exceeds 72  /  , the shear buckling resistance V bw,Rd has to be calculated according to EN 1993-1-5 § 5.2, with the following assumptions:  Only the contribution of the web is considered  The end posts are non rigid Therefore the design resistance for shear buckling is obtained from: M1 w w w yw bw,Rd 3   h t f V  where: h w is the height of the web: h w = h – 2 t f  w is the reduction factor for shear buckling that depends on the web slenderness w  The web slenderness is:    k t h w w w w 37,4  where: yw w 235 / f   k  = 5,34 The reduction factor  w is calculated as follows: If w  < 0,83/  :  w =  Otherwise  w = 0,83/ w  Then the criterion is calculated by: bw,Rd Ed Vb V V   6.3.5 Bending resistance The bending resistance M Rd of a cross-section is calculated according to 6.3.7, by taking the parameter  equal to 0 (i.e. no influence of the shear force). The criterion is obtained from: Rd Ed M M M  