Steel Buildings in Europe

Part 5: Joint Design 5 - 86 5.2 Checks for tension 5.2.1 Net tension 5.2.1.1 Net tension effects N Ed, G M Ed V Ed V Ed ) ) ( ( 2 2 N N Ed, G Ed, G M M h h Ed Ed + - The following checks the presence of net tension due to axial load and bending moment [4] : If M Ed ≤ 2 Ed,G N h then net tension does not occur and so the splice need only be detailed to transmit axial compression by direct bearing. If M Ed > 2 Ed,G N h then net tension does occur and the flange cover plates and their fasteners should be checked for tensile force, F Ed . F Ed = 2 Ed,G Ed N h M  M Ed is the nominal moment due to factored permanent and variable loads (i.e. column design moment) at the floor level immediately below the splice. N Ed,G is the axial compressive force due to factored permanent loads only. h is conservatively the overall depth of the smaller column (for external flange cover plates) or the centreline to centreline distance between the flange cover plates (for internal flange cover plates). Preloaded bolts should be used when net tension induces stress in the upper column flange > 10% of the design strength of that column.