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 Shear Design

Shear Design

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

The design of the 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 design requirement is as follows:

VEd  VRd 

where

  • VEd : design value of acting shear force (principal shear force determined by the program)
  • 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:

VRd,c

design shear resistance of a structural component without shear reinforcement

VRd,s

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

VRd,max

design shear resistance due to the load capacity 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. The load-bearing capacity of the concrete compression strut must additionally be analyzed.

VEd  VRd,s  VEd  VRd,max 

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