Column Anchorages
Inadequate anchor rod and bolt installation has been identified as a primary contributing factor to structural collapses.
Ironworkers Setting Column
To prevent structural collapse, it is critical erectors use the proper use of anchor rods (anchor bolts) to ensure column stability. This section is covered by OSHA Standard 1926.755.
Erection Stability
When performing steel erection operations, it is very important to follow these best practices:
- All columns must be anchored by a minimum of 4 anchor rods (anchor bolts).
- Each column anchor rod (anchor bolt) assembly, including the column-to-base plate weld and the column foundation, must be designed to resist a minimum eccentric gravity load of 300 pounds located 18 inches from the extreme outer face of the column in each direction at the top of the column shaft.
- Columns must be set on elements that adequately transfer the construction loads, such as the following:
- level finished floors
- pre-grouted leveling plates
- leveling nuts
- shim packs
- All columns must be evaluated by a competent person to determine whether guying or bracing is needed. If guying or bracing is needed, it must be installed.
Anchor Rods (Anchor Bolts)
Approval by the project structural engineer of record is required before anchor rods (anchor bolts) can be:
- repaired
- replaced
- field-modified
Before the erection of a column, the controlling contractor must provide written notification to the steel erector if there has been any of the following:
- repair
- replacement
- modification of the anchor rods of that column
Knowledge Check Choose the best answer for the question.
3-8. When performing steel erection operations, all columns must be anchored by a minimum of_____.
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