Hello! I am currently generating the P-M interaction diagram of a confined concrete column using Mander's model for confined concrete, Hognestad's model for unconfined concrete, and Priestley's model for steel. The problem is, when generating my ϕP-ϕM diagram, the trend deviates from the original trend of the P-M diagram (without the reduction factors).
My question now is what are the basis of ACI in using 0.002 and 0.005 as the limits for compression and tension controlled regions.
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