Wood Design: Asd/lrfd: Structural

Traditional, deterministic method based on elastic design .

In modern structural engineering, designers of wood systems must navigate two distinct philosophies: and Load and Resistance Factor Design (LRFD) . Both are currently accepted by the National Design Specification® (NDS®) for Wood Construction. 🏗️ Design Philosophies Allowable Stress Design (ASD)

Modern, reliability-based method that uses statistical probability .

"Factored" loads increase the design burden based on the uncertainty of the load type (e.g., higher factors for live loads vs. dead loads).

Remains the historical standard for wood and is widely used due to its simplicity and the extensive existing library of hardware catalogs based on ASD. Load and Resistance Factor Design (LRFD)

Traditional, deterministic method based on elastic design .

Modern, reliability-based method that uses statistical probability .

"Factored" loads increase the design burden based on the uncertainty of the load type (e.g., higher factors for live loads vs. dead loads).

Remains the historical standard for wood and is widely used due to its simplicity and the extensive existing library of hardware catalogs based on ASD. Load and Resistance Factor Design (LRFD)