The PCA Notes place immense focus on the major shifts introduced in ACI 318-19. Understanding these specific areas is critical for modern structural engineering workflows. High-Strength Reinforcing Steel

One of the most profound changes in ACI 318-19 was the overhaul of the shear strength equations for non-prestressed concrete members. Size Effect Factor ( λslambda sub s

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ACI 318-19 places a heavier emphasis on robustness to prevent progressive collapse, particularly in cast-in-place construction.

The PCA Notes dedicate substantial chapters to STM, simplifying the process of idealizing complex concrete stress fields into a truss mechanism composed of: Compression zones of concrete. Ties: Tension zones represented by reinforcing steel.