For almost a century, Design of Concrete Structures has been the authoritative source for the behavior of reinforced concrete structures and design approaches in accordance with the ACI 318 Building Code. The 2019 ACI Building Code contains over 150 technical changes. These changes address higher strength reinforcement, revisions to flexural design, shear capacity, and development of reinforcement. The changes have profound and important impacts on the design of concrete structures. The 16th edition of Design of Concrete Structures by Darwin and Dolan presents current concrete behavior theory and updated code-based design rules. The text and illustrated examples are essential for faculty members, students, and practitioners to understand current concrete design.