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2.4.3 Determination of Statically Required Reinforcement
Determination of Statically Required Reinforcement
The stress-strain relations for concrete and reinforcing steel described in chapter 2.4.2 together with the possible range of strain distributions (limit strains) represent the basis for the determination of the required longitudinal reinforcement for the previously determined design moments. This process is also documented in the design details.
The first subentries for the required longitudinal reinforcement are top surface and bottom surface of the plate. The entries Bottom surface (+z) and Top surface (-z) contain further details for each reinforcement direction.
Figure 2.39 shows that the reinforcement directions 2 and 3 require only very little or no reinforcement at the plate's bottom surface.
The Reinforcement Direction 1 is to be designed for the design bending moment mend,+z,φ1 = 35.89 kNm/m. The strains provide information about the determination of the longitudinal reinforcement.
We will check the example shown in Figure 2.39 for a dimensionless design procedure by means of a design table. The following input parameters are given:
- Cross-section [cm]: rectangle w/h/t = 100/20/17
- Materials: concrete C20/25 B 500 S (A)
- Design internal forces:
MEds = nsend, +z, φ1 = 240.005 ⋅ 0.161 = 38.64 KNm/m
NEd = 0.00 kNm/m
For μEds = 0.1183, the following values can be interpolated from the design tables (for example  Annex A4):
With these values, the required longitudinal reinforcement can be determined: