Open Web Bar Joist Roof

6 design of steel joist roofs to resist uplift loads.

Open web bar joist roof.

In structural engineering the open web steel joist is a lightweight steel truss consisting in the standard form of parallel chords and a triangulated web system proportioned to span between bearing points. Open web steel joists are relatively light in weight fabricated in a shop setting and have a trussed web. The steel joist institute discusses the key points of technical digest no. Common bearing length for a k series joist on masonry is 4 6 and 2 1 2 on steel.

The k series joist web is a single bent bar running zig zag between top and bottom chords. Allowing for seamless integration of mechanical electrical and plumbing mep systems. Open web steel joists or bar joists or short span joists or long span joists k series kcs series lh series dlh series slh series joists girders and bridging are available in prime painted gray finish uncoated or galvanized. Open web steel joists are an engineered truss like construction component used to support loads over short and long spans alike.

And making erection easier and faster. K joists are used typically where shorter span conditions are required. The maximum span is measured o c. Typically used in non residential construction steel joists and joist girders provide an economical system for supporting floors and roofs.

The spans are based on simple span joists. In order to accurately design an owsj engineers consider the joist span between bearing points joist spacing slope. Dead load deflection is limited to l 360 and total load deflection is limited to l 240. The open web design of steel joists and joist girders introduce a range of cost and performance advantages.

Made of lightweight materials makes them a less costly alternative in building construction. The main function of an owsj is to provide direct support for roof or floor deck and to transfer the load imposed on the deck to the structural frame i e. Lh and dlh joists have heavier chords and web members for heavier loads and longer spans. Topics include the design requirements of the asce sei 7 10 wind provisions for open web steel joists and joist girders and the end anchorage and bridging considerations for uplift loads on steel joists.

Bar joist our open web steel joist series are designed to meet the specifications of k kcs lh series joist we also manufacture specialty joist per requirement. Therefore steel bar joists or also known as open web steel joists for framing floors and roofs offer many advantages when compared to a wood truss or steel beam system. Steel joists handle loads and span conditions that a tradition wood system cannot typically handle. These joist must have stamped plans.

Of bearings and is based on uniformly loaded joists. The minimum bearing length is 1 spans values in bold indicate that web stiffeners are required at the osb end panel.