Background on Strength Interaction Diagrams by Hand

By hand, we can compute three points (pure compression, pure flexure, and the balance point). We then draw a straight line between pure compression and the balance point, and either a straight line or an appropriate curve between the balance point and pure flexure. This approach is commonly applied to reinforced concrete columns.

Pure Compression

Pure Flexure

As before, the possible contribution of compressive reinforcement is small, and can be neglected.

Next, calculate the corresponding tensile and compressive forces

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