The code gives you the basic equation: [ l_d = \frac{3}{40} \frac{f_y}{\lambda \sqrt{f' c}} \frac{ψ_t ψ_e ψ_s}{c_b + K {tr}} d_b ] The PCA Notes provide a to determine if you can use the simplified table (25.4.2.2) or if you must use the rigorous equation. More importantly, they show a failed development length check—a bar that pulls out—and how to fix it by adding a standard hook or increasing cover. The code does not show failure; the Notes do.
For over half a century, the Portland Cement Association (PCA) has served as the structural engineering community’s trusted interpreter of the American Concrete Institute’s Building Code (ACI 318). While ACI 318 is the legal, enforceable standard for concrete design, it is notoriously dense. It tells you what to do, but rarely why or how to navigate its nuances. pca notes on aci 318-14
The biggest change in ACI 318-14 was moving from a chapter structure based on components (Beams, Columns, Slabs) to one based on requirements (General, Loads, Analysis, Strength, Serviceability). The code gives you the basic equation: [
The Notes often simplify the complex geometry of failure cones into understandable diagrams, which is invaluable when performing hand calculations or verifying software output. For over half a century, the Portland Cement