Pca Notes On Aci 31819 [work] Jun 2026

A concrete structure is only as reliable as the engineer’s interpretation of the code. The PCA Notes ensures that interpretation is accurate, efficient, and defensible.

The PCA Notes (specifically SP-17: Design of Structural Concrete ) is widely considered the "practitioner’s bible." While ACI 318-19 is the legal code (the "what"), the PCA Notes explains the "why" and, most importantly, the "how." pca notes on aci 31819

The official title is

One of the most noteworthy changes in ACI 318-19 (and thus heavily annotated in the PCA Notes) is the . For decades, punching shear capacity did not penalize thicker slabs, even though tests showed a reduction. The 2019 code introduces a factor λ_s = min(0.5 + d/20, 1.0) for slabs thicker than 10 inches. The PCA Notes provides worked comparisons: a 24" thick mat foundation loses ~25% of its nominal shear capacity under the new rules. A concrete structure is only as reliable as

With changes to the sectional shear strength (Vc) and torsion provisions, the Notes include comparative examples showing how new equations affect member sizing. For decades, punching shear capacity did not penalize