What is the main purpose of bridging between open-web steel joists?
Correct Answer
D) To brace and align joists and help stabilize the joist system
Joist bridging braces and aligns joists and helps stabilize the joist system; it does not replace seats, concrete cover, or deck diaphragm fastening. Other choices confuse bridging with support bearing or deck functions.
Why This Is the Correct Answer
Joist bridging braces and aligns joists and helps stabilize the joist system; it does not replace seats, concrete cover, or deck diaphragm fastening. Other choices confuse bridging with support bearing or deck functions.
Why the Other Options Are Wrong
Option A: Use joist bridging to replace the joist seats at the supports
In metals work, To replace the joist seats at the supports is the wrong selection for Joist bridging: it treats Joist bridging as optional.
Option B: Use joist bridging to provide concrete cover over deck ribs
The trap in B is To provide concrete cover over deck ribs. That selection is wrong because the option shifts to a different trade task; the tested Joist bridging function or field correction is To brace and align joists and help stabilize the joist system; Joist bridging braces and aligns open-web steel joists.
Option C: Use joist bridging to eliminate all roof diaphragm fastening
Choice C gives To eliminate all roof diaphragm fastening. Its specific error: it removes the controlling Joist bridging requirement instead of meeting it.
Memory Technique
Keep joist bridging as a cause-to-effect card with To brace and align joists and help stabilize the joist system on the back.
Reference Hint
Open Technical Digest No. 9 - Steel Joists & Joist Girders, 3rd Ed., 2008; 29 CFR 1926 Subpart R; use the index entry or section for "Steel joist bridging function" to confirm that Joist bridging braces and aligns joists and helps stabilize the joist system; it does not replace seats, concrete cover, or deck diaphragm fastening.
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