Each Chicago Clamp System® has been designed, and then rigorously tested by an independent engineering lab, to provide a product on which you can depend.
Maximum Span for OSHA Ultimate Load for Fall-Arrest
|Rectangular Tube Size (inches);
strong axis bending (a-i)
|Concentrated Load = 5,000 lbs; OSHA|
|Interior Load (j)||Load Near an End (k)|
|(inches)||(inches & feet)||(inches)||(inches & feet)|
|HSS 4" x 2" x 1/8"||120"||10′-0"||120"||10′-0"|
Table Notes a-k
- Long dimension of tube cross-section is vertical, parallel to load (strong-axis bending).
- The required ultimate load (5,000 lbs concentrated) is per OSHA, for fall-arrest supports.
- Concentrated (OSHA) load may be located anywhere in the tubes’ span, and is considered to act vertically downward. A span of less than 10′ may be used.
- Concentrated (OSHA) load is the net loading on the tube. Weight of tube has been accounted for.
- Ultimate strength is based on 46 ksi minimum yield steel (ASTM A500, Gr. B) and the AISC specification.
- The maximum spans for the OSHA ultimate load are governed by strength (minimum yield). Deflection is not a criterion.
- Tube-wall thickness is nominal. Minimum actual is 0.93 times nominal, per 2010 AISC specification.
- Tube walls (bottom, top, and sides) are to have no holes.
- Adequacy of tubes is based on use only with Chicago Clamp fittings (at tube ends, and at attachment point for fall-arrest lanyard), as verified by testing.
- For the OSHA load at midspan, each end reaction is 2,500 lbs due to OSHA ultimate load plus about 60 lbs due to self-weight of tubes, end clamps, fall-arrest bracket, and eye bolt.
- For the OSHA load applied near one end of the tubes, the maximum end reaction is 4,540 lbs due to the OSHA load, and the maximum self-weight reaction (tubes, end clamps, fall-arrest bracket, and eye bolt) is about 60 lbs.