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2.5.8 Minimum Longitudinal Reinforcement
Minimum Longitudinal Reinforcement
The statically required longitudinal reinforcement is now compared to the minimum reinforcement. Unfortunately, none of the standards available in RF-CONCRETE Surfaces provides any regulations on the minimum reinforcement for shells. As a criterium, it is therefore analyzed, for which constellation of the moment and axial force the element is more likely to be a wall (mainly subjected to compression) or a plate (mainly subjected to bending). The distinguishing criterion is the related load eccentricity ed/h in the ultimate limit state (ULS):
moment of linear plate analysis (ULS)
axial force of linear plate analysis (ULS)
Since there are moments and axial forces both in x- and y-direction in a design point, the related load eccentricity per design point is the largest quotient from moment over axial force of both directions.
In RF-CONCRETE Surfaces, the following is uniformly specified for all standards:
mainly subjected to bending → reinforcement rules for plates
mainly subjected to compression → reinforcement rules for walls
This regulation can be found in EN 1992-1-1, clause 9.3: Solid slabs, and clause 9.6: Walls.
In our example, where the system is mainly subjected to bending, the following minimum reinforcement is shown in the design details.