The nominal moment capacity of a concrete beam can be calculated using the Whitney Stress Block approximation (also known as the Equivalent Rectangular Stress Block). This is done to average the nonlinear concrete stresses at the ultimate state. This video also shows how to find the curvature, steel strain, and strength-reduction (phi) factor.
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Chapters:
0:00 Intro
1:01 Derivation of Capacity
5:44 Strains and Curvature
8:43 Example