Page 139 - Forensic Structural Engineering Handbook

3.24 DESIGN AND CONSTRUCTION PRACTICES

• The scaffold and its components (including the connections) must be able to support its
dead load and 4 times the intended live load, based upon its ultimate strength. In other
words, load factors of 1.0 and 4.0 should be applied to the dead and live loads in the
strength design method.
• The suspension rope including connecting hardware must have a factor of safety of 6 to 1
support the intended load.

1926.452. This section provides additional requirements for specific types of scaffolds,
for example,
• Pole scaffolds, tube and coupler scaffolds
• Fabricated frame scaffolds
• Plasterers,’ decorators,’ and large-area scaffolds
• Bricklayers’ square scaffolds
• Horse scaffolds
• Form scaffolds and carpenters’ bracket scaffolds
• Roof bracket scaffolds
• Outrigger scaffolds
• Pump jack scaffolds
• Ladder jack scaffolds
• Window jack scaffolds
• Crawling boards (chicken ladders)
• Step, platform, and trestle ladder scaffolds
• Single-point, adjustable suspension scaffolds
• Two-point adjustable suspension scaffolds (swing stages)
• Multipoint adjustable suspension scaffolds, stonesetters’ multipoint adjustable suspen-
sion scaffolds, and masons’ multipoint adjustable suspension scaffolds
• Catenary scaffolds
• Float (ship) scaffolds
• Interior hung scaffolds
• Needle beam scaffolds
• Multilevel suspension scaffolds
• Mobile scaffolds
• Repair bracket scaffolds
• Stilts
1926.453. The requirements of aerial lifts have been provided in this section, which cov-
ers the following vehicle-mounted devices:

• Extensible boom platform
• Articulating boom platforms
• Aerial ladders
• Vertical towers
• A combination of any such devices