RF-CONCRETE Surfaces Version 5

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RF-CONCRETE Surfaces Version 5

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2.4.4 Shear Design

Shear Design

The shear design differs significantly among the individual standards. In the following, it is described for EN 1992-1-1.

The check of shear force resistance is to be performed only in the ultimate limit state (ULS). The actions and resistances are considered with their design values. The general check requirement is as follows:

VEd  VRd 


  • VEd design value of acting shear force (principal shear force determined by RF-CONCRETE Surfaces)
  • VRd design value of shear force resistance

Depending on the failure mechanism, the design value of the shear force resistance is determined by one of the following three values.


design shear resistance of a structural component without shear reinforcement


design shear resistance of a structural component with shear reinforcement; limitation of the resistance by failure of shear reinforcement (failure of tie)


design value of the maximum shear force which can be sustained by the member, limited by crushing of the concrete compression strut

If the acting shear force VEd remains below the value of VRd,c, no calculated shear reinforcement is necessary and the check is verified.

If the acting shear force VEd is higher than the value of VRd,c, a shear reinforcement must be designed. The shear reinforcement must resist the entire shear force. In addition, the bearing capacity of the concrete compression strut must be analyzed.

VEd  VRd,s  VEd  VRd,max 

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