How do you read a joist designation?
The K-Series, LH-Series and DLH-Series standard joist designations shall be established by their nominal depth, followed by the letters K, LH or DLH as appropriate, and then by the Section Number designation assigned. The Section Number designations shall range from 01 to 25.
How far apart are steel joists?
With #2 grade lumber, the typical type for building, the span for a 2×6 joist is 10 feet for 12 inches on center, 9-10 feet for 16 inches on center, and 8-7 feet for 24 inches on center. As you can see, the further apart you space your joists, the less span is advised.
What is the difference between a joist and a truss?
The joist supports the load which the floor is built to bear. A truss is used to support the roof.
What is the correct spacing for floor joists?
Normally, floor joists are spaced 16 inches apart on center. This means from the center of one upright joist to the center of the next. Given that 2x8s are actually 1-¾ inches wide, it works out to be 14-¼ inches between each joist. With some structures, floor joists are required to be 12 or 24 inches apart on center.
Are joists and girders the same?
A joist and a girder are both types of beams. The term “beam” is a general, all-encompassing term that refers to a structural member in a structure that supports a roof or floor above it. A girder is the main load-bearing beam in a structure and is supported by posts. Joist is a structural member supported by beams.
When to use LH series steel bar joists?
Description. The use of LH Series joists are used for longer span conditions where heavier loads are required. These joists easily handle spans that other systems cannot handle while their lightweight construction makes them less costly than crustal steel beams. LH Series joists range in depth from 18” to 48” and can span up to 96’-0″.
What is the SJI code for Steel Joist Girders?
Material Steel joists, Joist Girders and accessories as provided by the seller. Owner. The entity that is identified as such in the contract documents. 170170171 CODE OF STANDARD PRACTICE FOR STEEL JOISTS AND JOIST GIRDERS
What’s the difference between LH and DLH Series Joists?
As with LH-Series joists, DLH-Series (Deep Longspan) joists are for longer span conditions and support larger loads. With standardized depths from 52” through 120” and spans up through 240 feet, DLH joists also allow for special profiles to accommodate a variety of conditions.
How is shear transfer from concrete slab to steel joist?
Shear transfer from the concrete slab to the underlying steel joists is accomplished by welding steel shear studs through the steel deck to the steel joist top chord. Each joist is designed with a sufficient number of steel shear studs to develop the yield strength of the bottom chord.