Pca Notes On Aci — 31819 !link!

| Topic | ACI 318-14 | ACI 318-19 (PCA Notes emphasis) | |--------|--------------|-----------------------------------| | Shear strength (no stirrups) | ( 2\sqrtf'_c ) | Same but modified size effect factor | | High-strength concrete | Up to 12 ksi | Up to 20 ksi | | Minimum flexural reinforcement | ( 3\sqrtf'_c/f_y ) | Same, but ≥ 200/f_y | | Shear friction (Chapter 23) | Cohesion factor μ | Clarified for lightweight concrete | | Seismic detailing | Chapter 18 | Minor revisions for boundary elements |

equation is replaced by a formula that incorporates fluid mechanics and experimental data more accurately. Two-Way Shear (Punching Shear) pca notes on aci 31819

One of the most significant changes in ACI 318-19 is the expanded allowance of high-strength reinforcing steel. Previous code editions capped reinforcement strength at 60,000 psi (Grade 60) or 80,000 psi (Grade 80) for most applications. ACI 318-19 permits Grade 100 steel for many structural elements, including special seismic systems under specific conditions. | Topic | ACI 318-14 | ACI 318-19