Basically Minimum Reinforcement Ratio

M

MaFiAMaX

New Member
Hello Dear Colleagues, My question is not related to ideCAD, but I would like to ask a question since this forum is an environment where professional problems are also discussed comfortably. Do you accept the minimum reinforcement ratio for foundations in your designs? For example, there is a condition of 0.035% for the reinforcement ratio in both directions in slabs. Basically there is no limitation.
 
Hello, The following information Prof. It is an excerpt from Uğur Ersoy's book Reinforced Concrete 2 Flooring and Foundations. (Page 198) *The raft minimum reinforcement ratio should be around 0.0015-0.002 for each direction. (In normal depth foundations, it would be appropriate to take 0.002 to stay in the safe direction). For rafts with a depth of more than 1 meter, minimum reinforcement can be calculated according to 0.002 based on 1 meter depth in the calculation of minimum reinforcement. It would be more appropriate to take the reinforcement ratio of 0.0015 in deep rafts.* Good work
 
Levent, thank you for your reply. We read the same text this morning. But there seems to be an obvious point. Namely, we basically put both top and bottom reinforcement along the section. So, is the reinforcement ratio mentioned here just the reinforcement trying to pull, just like in the flooring? In other words, should the upper reinforcement be considered in the middle of the span of the foundation and the lower reinforcement only under the column?
 
Especially in seismic loading combinations, the raft can try to pull both under and over in different regions. Therefore, to stay on the safe side, the mentioned reinforcement ratio should be placed both above and below.
 
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