![]() ![]() Calculate the neutral axis depth for the stress block to extend over the full depth.ģ. Calculate the steel yield strain, and design concrete compressive stress and steel yield stress.Ģ. I'd suggest using a rectangular stress block and rectangular section with steel in equal areas at top and bottom face only, to keep things simple, then:ġ. To generate a graph matching the one from the book using on-sheet formulas rather than VBA should be quite straightforward. The code is all open source, but working through it is probably not the easiest way to find where your procedure is going wrong. The equations are not hidden, but they use user defined functions in VBA. RE: Reinforcement charts in excel spreadsheet: Concrete columns Pretty Girl (Structural) I have also attached my spreadsheet with the interaction diagram as shown above, on the Interaction Diagram tab. ![]() Which generates bending/axial load capacity results for circular sections to Eurocode 2, including detailed calculation output. If you can post your spreadsheet I'd be happy to have a look at it.Īnother resource you might find useful is: The difference from the book graph may be due to my including the additional reduction factor in the UK National Annex, and/or different assumptions about the cross section or distribution of steel.įrom your graph it looks like you are not taking moments about the composite section centroid, since you are getting an increasing bending moment as the stresses approach uniform stress across the section. ![]() This is what I get using my RC Design Functions spreadsheet, based on a rectangular section with equal reinforcement in the top and bottom face: ![]()
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