The spans are based on simple span joists.
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 an engineered truss like construction component used to support loads over short and long spans alike.
The open web design of steel joists and joist girders introduce a range of cost and performance advantages.
Typically used in non residential construction steel joists and joist girders provide an economical system for supporting floors and roofs.
Made of lightweight materials makes them a less costly alternative in building construction.
K series bar joists are designed for use typically with lighter loads and are most common in roof design.
Dead load deflection is limited to l 360 and total load deflection is limited to l 240.
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.
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.
The maximum span is measured o c.
All vulcraft joists and joist girders are designed and manufactured in accordance to the exacting specifications of the steel joist institute.
These joist must have stamped plans.
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.
The minimum bearing length is 1 spans values in bold indicate that web stiffeners are required at the osb end panel.
Steel joists handle loads and span conditions that a tradition wood system cannot typically handle.
Allowing for seamless integration of mechanical electrical and plumbing mep systems.
Lh and dlh joists have heavier chords and web members for heavier loads and longer spans.
K joists are used typically where shorter span conditions are required.
Common bearing length for a k series joist on masonry is 4 6 and 2 1 2 on steel.
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.
The steel joist institute discusses the key points of technical digest no.
The k series joist web is a single bent bar running zig zag between top and bottom chords.
In order to accurately design an owsj engineers consider the joist span between bearing points joist spacing slope.
These concentrated loads often include standard steel joists that are in turn supporting steel roof or floor deck.
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.
Open web steel joists are relatively light in weight fabricated in a shop setting and have a trussed web.
