Steel Buildings in Europe

Title Appendix B Worked Example: Design of a truss node with gusset 7 of 44 5 - 86 Note: the normal stress   in the weld needs not to be considered. EN 1993-1-8 4.5.3.2(5) On the throat section of the weld, the force per unit length are: a   = / 2 ) sin( a a g,max g   n e = -122,08 N /mm.mm a   = / 2 ) cos( a a g,max g   n e = -122,08 N /mm.mm a   = a g g n e  = 581,44 N /mm.mm The design resistance of the fillet weld will be sufficient if the following conditions are both fulfilled:  w = [   2 +3 (   2 +   2 ) ] 0,5 ≤ f u / (  w  M2 )   ≤ 0,9 f u /  M2 EN 1993-1-8 4.5.3.2(6) Where:  w is the correlation factor for fillet weld  w = 0,8 EN 1993-1-8 Table 4.1 These conditions can be rewritten in the following forms: ( a  w ) / a ≤ f u / (  w  M2 ) ( a   ) / a ≤ 0,9 f u /  M2 From these conditions, a minimum value for the effective throat thickness is derived. a 1,min = a  w / [ f u / (  w  M2 )] = 2,03 mm a 2,min = a   / (0,9 . f u /  M2 ) = 0,33 mm a min = max( a 1,min ; a 2,min ) = 2,03 mm The following requirements must be satisfied: a  3 mm l eff  max(30 mm ; 6 a ) with l eff = L w – 2 a EN 1993-1-8 4.5.2(2) 4.5.2(1) An effective throat thickness of 4 mm is then sufficient.