Structural Steel Erection Activity Hazard Analysis
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Structural steel erection is one of the highest-risk Definable Features of Work on USACE and DoD construction projects. The combination of working at significant heights, handling heavy multi-ton members with cranes, and performing connections in exposed positions makes steel erection a leading source of construction fatalities. EM 385-1-1 Section 19 establishes steel erection requirements that supplement OSHA Subpart R (29 CFR 1926.750-761) with additional controls specific to federal construction.
This Activity Hazard Analysis covers the complete steel erection sequence from delivery and staging through column erection, beam and girder placement, decking installation, and connection bolting. It addresses the unique hazards faced by ironworker connectors who must work at height on unprotected steel before permanent floors and guardrails are in place.
The initial risk assessment for structural steel erection rates the uncontrolled hazard as Extremely High (RAC 1), reflecting the catastrophic severity and likely probability of incidents without proper controls. Implementation of the controls specified in this AHA, including 100% tie-off, controlled decking zones, and steel erection fall protection plans, reduces residual risk to Low (RAC 4). All steel erection workers must review and sign this AHA, and the steel erection competent person must verify controls before each shift.
Disclaimer
This content is provided for general informational and educational purposes only. It is not a substitute for a site-specific Job Safety Analysis conducted by a qualified safety professional familiar with your workplace conditions, equipment, and personnel. OSHA citations, BLS statistics, and hazard controls referenced here may not reflect the most current standards or apply to your specific situation. Always consult current OSHA regulations, manufacturer guidelines, and a competent person before beginning work. Health & Safety Systems LLC assumes no liability for actions taken based on this content.
Definable Feature of Work (DFOW)
Structural Steel Erection
Erection of structural steel members including columns, beams, girders, joists, trusses, and metal decking for building frames, bridges, and industrial structures. Includes unloading, staging, hoisting, connecting, plumbing, and final bolt-up.
Typical Duration: 2-12 weeks depending on structural scope and building size
EM 385-1-1 References
Section 19.A: General Steel Erection Requirements
Establishes general requirements for structural steel erection including site preparation, column anchorage verification, fall protection requirements, and competent person qualifications for USACE projects.
Section 19.B: Hoisting and Rigging for Steel Erection
Requirements for crane selection, rigging of steel members, load calculations, signaling, and tag line use during steel erection lifts. Addresses multi-crane picks and tandem lifts.
Section 19.C: Structural Steel Assembly and Connections
Requirements for column splices, beam connections, plumbing and aligning, temporary bracing, and final bolt-up including tension verification.
Section 19.D: Metal Decking Installation
Requirements for metal decking bundles, leading edge protection, controlled decking zones, securing decking to steel, and fall protection during decking operations.
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Start Free TrialRisk Assessment Code (RAC)
The RAC matrix combines hazard severity and probability to assign a risk level before and after controls are applied. This AHA demonstrates risk reduction from initial to residual conditions.
Initial Risk (Before Controls)
Extremely High (1)
Severity: Catastrophic | Probability: Likely
Residual Risk (After Controls)
Low (4)
Severity: Critical | Probability: Unlikely
Step-by-Step AHA Breakdown
Step 1: Verify site preparation and anchor bolt installation
Hazards
- Column collapse from improperly installed or misaligned anchor bolts
- Foundation failure under column point loads
- Tripping hazards from anchor bolt projections and debris in erection area
Controls
- Verify anchor bolt installation meets design specifications for location, projection, plumbness, and embedment depth before steel delivery
- Obtain written confirmation from the controlling contractor that concrete has reached required design strength
- Clear the erection area of debris, fill holes, and grade surfaces to support crane operations and material staging
- Confirm column base plate hole patterns match anchor bolt patterns; report discrepancies to the engineer of record immediately
Step 2: Receive, inspect, and stage steel members
Hazards
- Struck-by during unloading from delivery trucks
- Crushing injuries from improperly stored or blocked steel members
- Material handling injuries from sharp edges, burrs, and heavy components
Controls
- Establish a designated steel staging area away from active erection zones
- Block and crib steel members to prevent rolling or shifting; use wedges on round sections
- Inspect all steel members for shipping damage, missing connection hardware, and proper identification marks
- Use appropriate rigging for unloading; never allow workers under suspended loads
- Maintain minimum 2-foot clearance between stacked members for rigging access
Step 3: Erect columns and install temporary bracing
Hazards
- Column overturning before bracing and connections are made
- Falls from height during column connection work
- Struck-by from swinging columns during crane placement
- Crane overload or boom contact with erected steel
Controls
- Install a minimum of four anchor bolts per column; do not remove nut from anchor bolt until column is braced
- Seat columns on a minimum of two anchor bolts before releasing the crane load, with column plumb within tolerance
- Install temporary guy wires or diagonal bracing immediately after column placement
- Connectors must be tied off 100% of the time at heights above 15 feet per EM 385-1-1 (more restrictive than OSHA 1926.760 which allows connectors up to 30 feet without fall protection)
- Use tag lines to control column rotation during hoisting; minimum two tag lines on columns over 30 feet
Step 4: Set beams, girders, and joists
Hazards
- Falls from height while making beam-to-column connections
- Struck-by from swinging beams or unexpected load shifts
- Beam rollover or instability before connection is completed
- Pinch points between beam flange and column during final seating
Controls
- Install at least two bolts per connection before releasing the crane load; bolts must be wrench-tight
- Use double connections or seat angles where beams frame into both sides of a column web to prevent loss of connection during placement of the opposing beam
- Connectors must maintain 100% tie-off; use retractable self-retracting lifelines (SRLs) anchored to the column or previously secured steel
- Use tag lines on all beam picks; position workers away from the swing path of hoisted members
- Install mid-span lateral bracing on open-web joists immediately after placement per SJI requirements
Step 5: Install metal decking
Hazards
- Falls from leading edge during decking installation
- Falls through unsecured or incomplete decking
- Decking bundles sliding off structural steel during staging
- Lacerations from sharp decking edges
Controls
- Establish controlled decking zones (CDZ) no more than 90 feet wide and 90 feet deep from the leading edge per 29 CFR 1926.760(c)
- Secure decking bundles to prevent sliding by placing them on structural members with adequate bearing; do not exceed the load capacity of supporting members
- Install perimeter safety cables at 42 inches along the controlled decking zone boundary
- Secure each deck sheet with a minimum of two fasteners (puddle welds or screws) before moving to the next sheet
- Workers outside the CDZ must use conventional fall protection (guardrails or personal fall arrest)
- Wear cut-resistant gloves rated ANSI A4 or higher when handling metal decking
Step 6: Plumb, align, and final bolt-up structural connections
Hazards
- Structural instability during plumbing operations as temporary bracing is adjusted
- Falls while working at connection locations
- Hand injuries from impact wrenches and bolt tensioning equipment
- Hearing damage from pneumatic impact wrenches
Controls
- Plumb and align the structure within design tolerances before removing any temporary bracing; verify with transit or plumb laser
- Do not remove temporary bracing until permanent connections provide equivalent stability as confirmed by the engineer of record
- Torque or tension all bolts per the Research Council on Structural Connections (RCSC) specification using calibrated wrenches or tension-indicating washers
- Workers must maintain 100% tie-off during all bolt-up operations at height
- Wear hearing protection when operating pneumatic impact wrenches (exposures typically exceed 100 dBA)
Step 7: Install perimeter protection and safety netting
Hazards
- Falls from open perimeter edges before permanent guardrails or walls are constructed
- Objects falling from open floors striking workers below
Controls
- Install perimeter safety cables or guardrails at each floor level as soon as decking is secured
- Install safety netting below the working floor to catch falling objects when workers are present below
- Barricade and post all open floor holes, stairwell openings, and elevator shafts
- Maintain perimeter protection until permanent walls or cladding provide equivalent fall protection
Competent & Qualified Persons
EM 385-1-1 requires designated competent and qualified persons for specific activities. These individuals must have the training, experience, and authority to identify hazards and take corrective action.
Steel Erection Competent Person
Must be able to identify existing and predictable hazards in steel erection operations, understand structural stability during erection sequence, and have authority to take immediate corrective measures including stopping work. Must have experience in steel erection operations and knowledge of connection types, crane rigging, and fall protection systems.
EM 385-1-1 Reference: Section EM 385-1-1 Section 19.A.01
Site Safety and Health Officer (SSHO)
Must hold a 30-hour OSHA Construction safety course and have a minimum of 5 years construction safety experience. Responsible for daily safety inspections, AHA review, and verifying that steel erection controls are in place.
EM 385-1-1 Reference: Section EM 385-1-1 Section 01.A.13
Qualified Rigger
Must demonstrate knowledge of rigging equipment types, proper selection, inspection, and use. Must be able to calculate loads and select appropriate rigging gear for steel member weights and configurations. Required for all hoisting operations.
EM 385-1-1 Reference: Section EM 385-1-1 Section 16.A.02
Crane Operator
Must hold a nationally accredited crane operator certification (NCCCO or equivalent) for the crane type being used. Must be evaluated by an employer-designated qualified person for the specific crane configuration on-site.
EM 385-1-1 Reference: Section EM 385-1-1 Section 16.B
Equipment, Training & Inspection Requirements
Required Equipment
Training Requirements
- OSHA 10-Hour Construction Safety (minimum for all steel erection workers)
- OSHA 30-Hour Construction Safety (required for SSHO and superintendents)
- Steel erection hazard awareness training per 29 CFR 1926.761
- Connector training including fall protection, double connection procedures, and controlled decking zone requirements
- Fall protection training including harness inspection, donning, 100% tie-off procedures, and SRL use
- Qualified rigger training for all personnel involved in hoisting steel members
- Crane signal person training (qualified signal person per 29 CFR 1926.1428)
- Hazard communication training for welding consumables, coatings, and galvanizing
- Site-specific hazard orientation covering this AHA, the crane lift plan, and the steel erection plan
- EM 385-1-1 awareness training specific to Section 19 steel erection requirements
Inspection Requirements
- Pre-erection verification of anchor bolt installation and concrete strength certification
- Daily inspection of all rigging hardware (shackles, slings, beam clamps) before each shift
- Daily inspection of personal fall arrest equipment (harnesses, lanyards, SRLs, anchorage points)
- Pre-lift crane inspection per OSHA 29 CFR 1926.1412 including function test of all crane safety devices
- Inspection of each steel member for damage, deformation, or missing connection hardware before hoisting
- Bolt installation verification: inspect snug-tight condition before final tensioning; verify final tension per RCSC specification
- Daily inspection of controlled decking zone boundaries, perimeter cables, and safety netting
- Weekly documented safety inspection by the SSHO covering all steel erection activities
- Post-event inspection after high winds, seismic activity, or any incident affecting structural stability
Applicable OSHA Standards
29 CFR 1926.754
Structural Steel Assembly
Requirements for structural stability during erection, anchor bolt connections, minimum number of bolts per connection before crane release, column splices, and temporary bracing.
29 CFR 1926.756
Beams and Columns
Requirements for seated connections, double connections at columns, column splices, and perimeter safety cables. Addresses the specific hazard of beam connection failure during erection.
29 CFR 1926.760
Fall Protection for Steel Erection
Establishes fall protection requirements for connectors, deckers, and other steel erection workers. Addresses controlled decking zones, connector fall protection criteria, and criteria for steel erection fall protection plans.
29 CFR 1926.761
Training for Steel Erection
Requires training for all steel erection workers in fall hazards, falling object hazards, hazardous materials, and the site-specific erection plan. Additional training required for connectors working at height.
29 CFR 1926.753
Hoisting and Rigging
Requirements for crane operations during steel erection including multiple lift rigging procedures, Christmas-treeing limitations, and working under loads.
29 CFR 1926.752
Site Layout, Site-Specific Erection Plan, and Construction Sequence
Requires a site-specific erection plan when the structure does not conform to standard details, including pre-planning for stability, rigging, and erection sequence.
Required Personal Protective Equipment
Frequently Asked Questions
What fall protection height trigger does EM 385-1-1 require for steel erection connectors?
EM 385-1-1 requires 100% tie-off for steel erection connectors at heights above 15 feet. This is more restrictive than OSHA 29 CFR 1926.760, which permits connectors to work without conventional fall protection or fall arrest up to 30 feet if certain criteria are met. On USACE projects, the EM 385-1-1 requirement governs, and connectors must use personal fall arrest systems (harness and SRL or retractable lanyard) at all times above the 15-foot threshold.
What is a controlled decking zone and what are the requirements?
A controlled decking zone (CDZ) is a defined area of the structure where metal decking is being installed and where access is limited to decking crews. Per 29 CFR 1926.760(c), the CDZ may not exceed 90 feet wide and 90 feet deep from the leading edge. Only decking workers trained in CDZ procedures may enter the zone. Perimeter safety cables must be installed at 42 inches at the CDZ boundary, and each deck sheet must be secured before the worker moves to the next sheet.
How many bolts must be installed before releasing a crane load on a steel connection?
Per 29 CFR 1926.754(e), each connection must have a minimum of two bolts installed and wrench-tight before the crane load can be released. This applies to all beam-to-column, beam-to-beam, and beam-to-girder connections. For column splices, a minimum of two bolts per flange splice must be installed and wrench-tight before the crane releases the upper column section.
What is the double connection requirement for structural steel?
When beams frame into opposite sides of a column web, 29 CFR 1926.756(c) requires that the first beam be secured with at least two bolts wrench-tight before the second beam is placed. If the first connection is a seated connection (e.g., clip angle or shear tab), the beam may be set on the seat and the crane released, but bolts must still be installed wrench-tight before the opposing beam is connected. This prevents the second beam from displacing the first during placement.
What qualifications does the steel erection competent person need on a USACE project?
The steel erection competent person on a USACE project must demonstrate knowledge of steel erection hazards, structural stability during erection sequence, connection types and requirements, crane rigging procedures, and fall protection systems. They must have the authority to stop work and take immediate corrective action. EM 385-1-1 requires this person to be on-site whenever steel erection is in progress. Their qualifications must be documented in the Accident Prevention Plan and approved by the Contracting Officer.