Steel Buildings in Europe

Part 5: Joint Design 5 – 102 b f is the width of the concrete foundation t f is the flange thickness of the column e b is the additional width outside of the base plate =   2 / 2 f f t b b   e h is the additional depth outside of the base plate =   2 / 2 f f t h h   f cd = c ck cc   f [EN 1992-1-1, §3.1.6(1)] α cc is a coefficient that takes into account long term effects on the compressive strength and of unfavorable effects resulting from the way the load is applied. [13]  c is the material factor for concrete from EN 1992-1-1, §2.4.2.4 [13] Concrete class C20/25 C25/30 C30/37 C35/45 Cylinder strength, fck (N/mm2) 20 25 30 35 Cube strength, fck,cube (N/mm2) 25 30 37 45 6.2 Calculation of c eff p p h b 2 + c t f A c 1 Projection, c t f = flange thickness t w = web thickness Basic requirement: A req = A eff  If 2 c ≤ f 2 t h  , then there is no overlap. Thus c may be calculated from the following equations for I and H sections: A eff ≈ 4 c 2 + Per col c + A col where: A col is the cross sectional area of the column Per col is the column perimeter  If 2 c > f 2 t h  , then there is an overlap. Thus c may be calculated from the following equations for I and H sections: A eff ≈ 4 c 2 + 2 ( h + b ) c + h  b