Category: Structure & materials
Prepared by Eng. Ahmed Fathy, Projects Manager ·
Definition
Steel connections join columns, beams and bracing using high-strength bolts of grades such as 8.8 and 10.9, welding, or both. They are designed to carry set forces and detailed in shop drawings.
Why it matters on a project
Most steel structure failures start at connections, not members. Their details set erection speed and fabrication cost.
Measurement and pricing
Within structural steel weight in tonnes with an allowance for plates and bolts, or bolts by number in some contracts.
Common mistake
Tightening high-strength bolts without a torque wrench or approved method, so they do not reach the required tension.
Frequently asked questions
Bolts or welding?
Bolts are faster on site and easier to inspect, welding suits the shop; the choice follows design and erection conditions.
How are welds inspected?
Visually, then by non-destructive tests such as ultrasonic or dye penetrant per the specification.
Related terms
- Steel structureA structural frame of steel sections connected by welding or bolts, protected from corrosion by coating.
- Anchor boltsBolts set in concrete to fix steel columns and equipment to foundations.
- Shop drawingsDrawings prepared by the contractor or fabricator showing how items are made and installed, approved by the consultant before execution.
- Third-party inspectionIndependent testing by an accredited body separate from contractor and owner.
Read next
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