" Plastic Analysis and Design of Steel Structures " primarily refers to a seminal textbook by (published by Elsevier/Butterworth-Heinemann ), which provides a comprehensive guide for engineers on using the plastic method to design steel frames . Unlike traditional elastic design, plastic analysis utilizes the ductility of steel to allow for the redistribution of moments beyond the initial yield point, often resulting in significant material savings—estimated at 12.3% in total steel tonnage in some comparative studies. Core Concepts of Plastic Analysis Plastic analysis and design of steel structures