Which designation is used by the Steel Joist Institute's Standard Specification to designate short span steel bar joists?

The designation used by the Steel Joist Institute's Standard Specification to designate short span steel bar joists is the K-Series. This designation refers specifically to the series of joists that are designed for spans typically ranging from 20 to 40 feet, making them suitable for a variety of light to moderate load applications in commercial construction.

The K-Series joists are known for their cost-effectiveness and efficiency in design, which helps to minimize the overall weight of the structure while providing adequate load-bearing capabilities. This makes them an ideal choice in scenarios where the spans are relatively short and where construction efficiency is a priority.

The other series mentioned, such as LH-Series and DLH-Series, refer to long-span joists, designed for larger spans and higher loads, while the CJ-Series typically indicates composite joists which might be used in more specialized contexts. Each designation serves a specific purpose based on the structural requirements, but for short spans, the K-Series designation is the standard recognized in the specifications.