Reinforcement
This sometimes happens for an ACI318 or BS8110 / TR43 design.
RAM Concept locates the minimum reinforcing required by certain design criteria on the tension face of the slab (or the face with the least amount of compression); this normally works well for both elevated slabs and mat foundations.
However, in certain cases the moment at a design strip cross section is of the opposite sign of what would be expected given the location. For an elevated slab this can lead to reinforcing at columns being at the bottom of the slab and reinforcing at mid-span being at the top of the slab.
For example, for ACI318 or TR43 if there is no tension at a slab location under service conditions, then RAM Concept places the minimum support rebar on the face with the least amount of compression. This could be the bottom face at a column.
You can overrule this by choosing Elevated Slab for the design strip property CS Min. Reinforcement Location.
See Span segment properties .
This can be for a number of reasons. The common ones are:
- The floor is post-tensioned and yet you have not checked the Consider as Post-Tensioned option. RAM Concept is ignoring the tendons. See the description in Span segment properties .
- The depth of the span segment strip cross section contributes to a large amount of minimum reinforcement. This may be because the cross section depth is based upon a thickened area.
- The bonded tendons are not in the tensile zone.