Direct Answer
Temporary bracing is steel cables, rods, or members installed during erection to stabilize the partially-erected structure against wind and construction loads before the permanent lateral system is complete. The erection engineer designs the temporary bracing; the ironwork contractor installs it. OSHA 1926.755 requires a written erection engineering analysis. The fabricator's responsibility is limited to providing the steel members — the erection stability plan belongs to the erection contractor.
Full Explanation
Temporary bracing requirements depend on: the permanent lateral system (moment frame, braced frame), the erection sequence, and the wind region. In a braced frame building, the permanent braces often provide temporary stability once their connections are made up. In a moment frame building, temporary cables or knee braces may be required until enough moment connections are made. The erection engineer quantifies the required bracing force and specifies cable sizes, anchor points, and turnbuckle capacity.
What This Means for Your Shop
Confirm with the erection contractor who is providing temporary bracing hardware (cables, turnbuckles, anchors). In some contracts, the fabricator provides all steel; the erector provides rigging. In others, the fabricator is responsible for erection hardware. This should be clearly defined in the subcontract.
Common Mistakes
Assuming temporary bracing is 'standard' and not requiring a written erection engineering analysis. OSHA requires the analysis, and without it the erection contractor is in violation — which can shut down the site.
Recommended Process
At contract execution, confirm who is responsible for temporary bracing design and supply. Request a copy of the erection engineering analysis before erection begins. Verify temporary bracing is installed before releasing the ironwork crew to proceed to the next tier.