Steel Buildings in Europe

Part 10: Technical Software Specification for Composite Beams 10 - 13 3 MATERIAL PROPERTIES 3.1 Structural steel The steel properties are defined by EN 1993-1-1 [3] : E is the modulus of elasticity ( E = 210000 N/mm 2 ) G is the shear modulus ( G = 80770 N/mm 2 ) f y is the yield strength that is derived from Table 3.1 of EN 1993-1-1, depending on the steel grade and the material thickness. For simplicity, the yield strength may be derived from the flange thickness. f yw is the yield strength of the web, derived from the web thickness.   is the material parameter defined as:   y 235 / f   f y is the yield strength in N/mm 2 . 3.2 Reinforcement steel bars The properties of reinforcing steel are defined by EN 1992-1-1: f yr,k is the yield strength of the transverse reinforcement bars. 3.3 Concrete The concrete properties are defined by EN 1992-1-1 [4] . They are derived from the concrete class. f ck is the characteristic compressive strength at 28 days, as given in Table 3.1 of EN 1992-1-1. f cd is the design compressive strength (EN 1994-1-1 § 2.4.1.2(2)): f cd = f ck /  c E cm is the secant modulus of elasticity, as given in Table 3.1 of EN 1992-1-1.