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Shear between web and flanges: the values of cotθf for the maximum longitudinal shear stress

Eurocode 2 part 1-1: Design of concrete structures   6.2.4 (4)

To prevent crushing of the compression struts in the flange, the longitudinal shear stress vEd should be satisfied:

vEdν fcd sinθf cosθf (6.22)


For the calculation of the maximum longitudinal shear stress, the recommended values of cotθf in the absence of more rigorous calculation are:

1,0 ≤ cotθf ≤ 2,0 for compression flanges (45° ≥ θf ≥ 26,5°)
1,0 ≤ cotθf ≤ 1,25 for tension flanges (45° ≥ θf ≥ 38,6°)

National choice