Anchoring to reinforced masonry for fall arrest

[cepe01]

I'm looking to design a fall arrest anchor in reinforced CMU wall using a swivel "d-ring":

http://www.fallprotectionpros.com/g...r-steel.html?gclid=CLLR69bPytQCFROBswodsecK9A

It is not specified to be used in CMU. However, we are looking to use it in a reinforced CMU wall that has achieved compressive strength of over 5,000 PSI in a prism test. The guardian D-ring requires 3,000 PSI concrete. Does this make it acceptable to use a grout-fill CMU wall? Or does grout/masonry block behave differently than concrete? I don't have alot of experience with masonry.

 

[cepe01]

Can anyone share insight on anchoring into masonry (reinforced)for fall arrest?

 

[JGard1985]

I would contact the manufacturer. Never done fall protection into CMU before, but I wouldn't use the Concrete Hardware Kit.

I think the concrete stress frustum and breakout area will be challenged with the CMU/grout interface. If I was going to use this anchor with this wall, I would through-bolt it through a solid core with reinforcement using the backplate.



Jeff
Pipe Stress Analysis Engineer

http://www.xceed-eng.com

 

[MotorCity]

Contact the manufacturer to see if it is appropriate to use in masonry. I suspect that it is as long as the wall can resist the required load. I expect that it will be governed by the rupture strength of the grout, which depends on its modulus of elasticity. The modulus of elasticity for grout is not the same as for concrete.