Steel Buildings in Europe

Part 10: Technical Software Specification for Composite Beams 10 - 17 If ( h – 2 ( t f + r ))/ t w  72  then the web is Class 1, If ( h – 2 ( t f + r ))/ t w  83  then the web is Class 2, If ( h – 2 ( t f + r ))/ t w  124  then the web is Class 3, Otherwise the web is Class 4. The class of the cross-section is the highest class of the compressed flange and the web. 5.2.3 Vertical shear resistance The criterion for the vertical shear resistance is calculated according to 6.3.3 of this guide. For shear buckling, refer to Section 6.3.4 of this guide. 5.2.4 Bending resistance The criterion for the bending resistance is calculated from:  M = M Ed / M c,Rd where: M Ed is the maximum design moment along the beam M c,Rd is the design bending resistance depending on the class of the cross- section: M c,Rd = W pl,y f y /  M0 for Class 1 or 2 M c,Rd = W el,y f y /  M0 for Class 3 M c,Rd = W eff,y f y /  M0 for Class 4 5.2.5 M-V interaction When the web slenderness h w / t w exceeds 72  /  , the shear buckling criterion  bw is calculated according to Section 6.3.4 as above mentioned in Section 5.2.3. When this criterion is higher than 0,5 and when the bending moment exceeds the bending resistance of the flanges, M-V interaction must be considered. The interaction criterion is (EN 1993-1-5 § 7.1(1)):   2 3 pl,Rd f,Rd 1 MV 2 1 1                M M if M Ed > M f,Rd where: 1  = M Ed / M pl,Rd 3  =  bw M pl,Rd = W pl,y f y /  M0 M f,Rd = b t f ( h - t f ) f y /  M0