Steel Buildings in Europe

Part 10: Technical Software Specification for Composite Beams 10 - 20 LTB Resistance The LTB Resistance is given by: M b,Rd =  LT,mod W y f y /  M1 where:  LT,mod is the modified reduction factor calculated according to EN 1993-1-1 § 6.3.2.3 (2). As simplification, it can be taken equal to  LT .  LT,mod =  LT / f but:  LT,mod  1 and: 2 LT LT,mod 1          2 LT c 0,8 1 0,5 1 1 2       k f but: f  1 k c is a correction factor that can be determined by the following expression: 1 c 1 C k  5.3 SLS Calculations At the construction stage, the deflection can be calculated using the formula given in Section 6.5.3 of this guide, where the second moment of area is the one of the steel section.