RF-CONCRETE Surfaces Version 5

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RF-CONCRETE Surfaces Version 5

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3.4.4 Standard

Standard

The parameters in this tab depend on the standard selected in window 1.1 General Data. You have to set standard-specific reinforcement data. In the following, this is described for EN 1992-1-1.

At the bottom right of the window, two buttons are available. Click [Default] to reset the initial values of the current standard. Use [Set As Default] to save the specified entries as new default settings.

Figure 3.44 Window 1.4 Reinforcement, BS EN 1992-1-1 tab
Minimum Reinforcement

This section allows you to control which provisions of the standard regarding the minimum reinforcements are to be considered in the design (see chapter 2.3.7).

For plates and walls, use the button to open more dialog boxes where you can set the directions of the minimum and main compression reinforcement.

Plates
Figure 3.45 Settings for Minimum Reinforcement for Ductile Properties dialog box

According to EN 1992-1-1, clause 9.3.1, the minimum reinforcement for ensuring a ductile structural component behavior is to be placed in the main span direction of the plate. As the main span direction cannot be found automatically in the determination of the reinforcement by element, it is possible to control the reinforcement direction you want to consider the minimum reinforcement in by using the following options:

  • Reinforcement direction with the main tension force in the considered element

The minimum reinforcement is considered only in the reinforcement direction with the greatest tension force from all reinforcement directions of the top surface (-z) and the bottom surface (+z): The minimum reinforcement is placed only in one direction and on one side of the plate.

  • Reinforcement direction with the main tension force in the corresponding reinforcement surface

For each reinforcement surface, the program searches for the reinforcement direction with the greatest tension force. Then, the minimum reinforcement is determined on each surface for these directions.

  • Define

The reinforcement direction you want to apply the minimum reinforcement in can be specified manually.

Walls
Figure 3.46 Settings for Minimum Reinforcement for Walls dialog box

You can specify the direction of the main compression reinforcement for determining the minimum longitudinal reinforcement for walls in the direction of the main compression force or Defined.

Shear Reinforcement

The two input fields define the allowable zone for the inclination of concrete struts Θ. The angles are preset according to EN 1992-1-1, clause 6.2.3. You can adjust them, if necessary, but they may not lie outside the allowed limits.

Factors

The input fields above control the Partial safety factors for concrete γc and reinforcing steel γs in the design. The values according to EN 1992-1-1, Table 2.1 are preset for the different design situations.

The Reduction factors αcc and αct take account of long-term effects on the concrete's compressive or tensile strength. These coefficients are given in EN 1992-1-1, clause 3.1.6 (1) and 3.1.6 (2).

Various

With the check box in this tab section, you can specify a Neutral axis depth limitation according to EN 1992-1-1, clause 5.6.3 (2). In this case, the maximum ratio is xd/d = 0.45 for concrete up to strength class C50/60, and xd/d = 0.35 for concrete from strength class C55/67.