What is the name of the organization which publishes a manual on the spacing requirements for bar supports?

The Concrete Reinforcing Steel Institute (CRSI) is the organization responsible for publishing manuals that address the spacing requirements for bar supports in reinforced concrete work. This manual serves as a critical resource for contractors, engineers, and architects, ensuring that the placement of reinforcing bars meets industry standards for structural integrity and performance.

The CRSI's publications are recognized for providing comprehensive guidelines and best practices that aid in the proper installation of reinforcing steel, which is essential for maintaining the strength and durability of concrete structures. This organization focuses specifically on reinforcing steel and its applications, which is why its manuals are a go-to source for information related to bar supports.

In contrast, while the American Concrete Institute and the International Code Council may provide guidelines and standards relevant to concrete construction, they do not specifically focus on bar supports or the detailed spacing requirements in the same way that the CRSI does. The Ninth Edition Handbook of Reinforcement is likely a specific text related to reinforcing steel but is not the name of the organization that publishes the manuals. The distinction made here emphasizes the specific industry focus of the CRSI on reinforcing steel, ensuring that the answer reflects the organization most directly involved in this area.