RF-CONCRETE Surfaces – Online Manual Version 5

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RF-CONCRETE Surfaces – Online Manual Version 5

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2.4.4.3 Shear force resistance of the concrete compression strut

Shear force resistance of the concrete compression strut

For structural components with shear reinforcement perpendicular to the component's axis (α = 90°), the shear resistance VRd is the smaller value from:

VRd,s  = ASWs · z · fywd ·cot θ     (6.8)

VRd,max = αcw · bw · z · ν1 · fcd(cot θ + tan θ)      (6.9)

where

Table 2.2

Asw

cross-sectional area of the shear reinforcement

s

spacing of links

fywd

design yield strength of the shear reinforcement

ν1

reduction factor for the concrete strength in case of shear cracks

αcw

coefficient for considering the stress state in the compression chord

For structural components with inclined shear reinforcement, the shear force resistance is the smaller value from:

VRd,s  = ASWs · z · fywd ·cot θ + cot α · sin α      (6.13)

VRd,max = αcw · bw · z · ν1 · fcd · (cot θ + cot α)(1 +cot2 θ)       (6.14)