What structural steel component is associated with the designation "LH"?

The designation "LH" refers specifically to a type of open-web joist known as a lightweight joist. These joists are designed to support loads and are characterized by their open web configuration that allows for the passage of mechanical, electrical, and plumbing systems, making them particularly efficient for use in floors and roofs. Open-web joists, identified by this designation, have specific depth-to-span ratios and are engineered for various load conditions, providing both strength and lightweight properties which are advantageous in construction.

Understanding the application and characteristics of open-web joists is crucial for contractors, as they play a significant role in ensuring structural integrity while optimizing materials and costs in projects. The recognition of the "LH" designation specifically indicates that the component has been engineered for lightweight applications, distinguishing it from other structural products like beams, columns, or trusses, which have different functions and designations.