Open web steel joist

While OWSJs can be adapted to suit a wide variety of architectural applications, the greatest economy will be realized when utilizing standard details, which may vary from one joist manufacturer to another.

As a non-profit organization of active manufacturers, the Institute cooperates with governmental and business agencies to establish steel joist standards.

[1] Load tables and specifications are published by the SJI in five categories: K-Series, LH-Series, DLH-Series, CJ-Series, and Joist Girders.

Architects, engineers and builders found it difficult to compare rated capacities and to use fully the economies of steel joist construction.

[1] Open Web Steel Joists, K-Series, were primarily developed to provide structural support for floors and roofs of buildings.

The depth of the bearing seat at the ends of underslung LH- and DLH-Series Joists have been established at 5 inches (130 mm) for chord section number 2 through 17.

A bearing seat depth of 7+1⁄2 inches (190 mm) has been established for the DLH Series chord section number 18 through 25.

[1] Open Web Composite Steel Joists, CJ-Series, were developed to provide structural support for floors and roofs which incorporate an overlying concrete slab while also allowing the steel joist and slab to act together as an integral unit after the concrete has adequately cured.

They are designed as simple spans supporting equally spaced concentrated loads for a floor or roof system.