A K-series open-web steel joist is seated on its support. Which minimum OSHA end attachment is acceptable for each end of that joist?
Correct Answer
D) Two 1/8 in. fillet welds 1 in. long, or two 1/2 in. bolts
OSHA 1926.757(b)(1) requires each end of a K-series steel joist to be attached with a minimum of two 1/8 in. fillet welds 1 in. long, or two 1/2 in. bolts, or equivalent. Other choices underattach the joist or use the larger LH/DLH detail.
Why This Is the Correct Answer
OSHA 1926.757(b)(1) requires each end of a K-series steel joist to be attached with a minimum of two 1/8 in. fillet welds 1 in. long, or two 1/2 in. bolts, or equivalent. Other choices underattach the joist or use the larger LH/DLH detail.
Why the Other Options Are Wrong
Option A: Base the k-series joist attachment response on one 1/2 in. bolt at one end only
Choice A (One 1/2 in. bolt at one end only) is rejected because One 1/2 in. bolt at one end only is a different published number than the cited K-series joist attachment value; 29 CFR 1926.757(b)(1) supports T.
Option B: Two 1/4 in. fillet welds 2 in. long
In metals work, Two 1/4 in. fillet welds 2 in. long is the wrong selection for K-series joist attachment: Two 1/4 in. fillet welds 2 in. long is a different published number than the cited K-series joist attachment value; 29 CFR 1926.757(b)(1) supports T.
Option C: Four 1/2 in. bolts plus a field weld
The trap in C is Four 1/2 in. bolts plus a field weld. That selection is wrong because Four 1/2 in. bolts plus a field weld is a different published number than the cited K-series joist attachment value; 29 CFR 1926.757(b)(1) supports T.
Memory Technique
Make k-series joist attachment a tabbed card: cite the exact condition, then choose Two 1/8 in. fillet welds 1 in. long, or two 1/2 in. bolts.
Reference Hint
Open Technical Digest No. 9 - Steel Joists & Joist Girders, 3rd Ed., 2008; 29 CFR 1926 Subpart R; use 29 CFR 1926.757(b)(1) to confirm that OSHA 1926.757(b)(1) requires each end of a K-series steel joist to be attached with a minimum of two 1/8 in.
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