Steel Roof Joist Chord Reinforcement

Steel joist institute publication technical digest no.

Steel roof joist chord reinforcement.

The first web member on either end of a joist or joist girder which begins at the top chord at the seat and ends at the first bottom chord panel. Steel joists joist girders. Typically used in non residential construction steel joists and joist girders provide an economical system for supporting floors and roofs. Panel points have a negligible effect on the overall performance of the joist.

12 evaluation and modification of open web steel. Thanks to its buildmaster fast. Open web steel joists are an engineered truss like construction component used to support loads over short and long spans alike. Both open web steel joists and joist girders will be referred to as joists in this digest.

Structural track usually in the same gauge as the. 2 are several details that have been used to reinforce the top or bottom chords of joists. To summarize the principles of joist reinforcement consideration must be given to the. Provide a lightweight low cost rigid floor assembly c joist components provide an economical lightweight alternative to open web trusses bar joists engineered lumber cast in place or hollow core floor assemblies.

Chord reinforcement typical reinforcement details top chord more difficult to reinforce since the floor or roof. Although standard k series including kcs series and standard lh series joists are designed specifically to support uniformly distributed loads applied to the top chord research conducted by the steel joist. Top chord reinforcement usually presents a bigger problem than the bottom chord because roof or floor deck is usually in place and interferes with the placement of reinforcement and welding. A new rule from the steel joist institute clarifies when local reinforcement of joists is required for chord loads away from panel points.

Steel joist institute states. From the bottom chord towards the end of the joist. To prevent sag in 2x6 s and strengthen at same time you could secure lengths of stainless steel or galvanized cable attach at each end of individual ceiling joists have cable go over a one or two spreaders or strut projecting down from the underside of the ceiling joist maybe 12 14 or so as not to lose too much headroom these could. A floor or roof covering made out of gage metal attached by welding or mechanical means to joists.

Sji members offer guidance about how and when to specify loads.