designforce of a person hanging under a roof

[europipe]

Our company is designing loading stations for trucks.
What is the designforce of a safety belt for a person attached to the structure underneath the roof?
And is it specified in a code?

Greetings

 

[mijowe]

I believe ANSI/ASSE Z359 may be what you are looking for. The actual codes are pricey but there are articles that can give you an overview.

http://www.asse.org/professionalsafety/pastissues/052/09/47_feldsteinz359_sept2007.pdf

 

[Ron]

In the US you have an OSHA requirement for this. Typically 5000 lbf resistance.

 

[CANPRO]

Also 5000 lbs here in Canada...

If the worker is wearing a shock absorbing lanyard the maximum arrest force is supposed to be 900 lbs.

I'm guessing you're in Europe, and I would also guess that it is spec'd in a code somewhere. You can't really go wrong designing for a load of 5000lbs (per person attached to anchor) but you should double check with your local codes.

 

[europipe]

Thank You guys,
I was asking this because of the light construction we need to make.
(Always that budget discussion

Greetings

 

[Once20036]

For window washing anchors, where someone will be hanging over the edge of a building, we typically require 5000 lb in any direction.

 

[MiketheEngineer]

Actually OSHA says twice the arresting force which we see as 900 lbs x 2 for a shock absorbing lanyard and actaully even less for an SRL (YO-YO). This is based on our testing!!

 

[europipe]

Actually we thought 150-200 kgf should be sufficient,
but we don't know what code proscribes something like that.

Greeings, and thank You all

 

[chrislaope]

200 kgf?, we have quite a lot people wieghs over 200 kgf here. OSHA and lawer will soon find you in court.

 

[europipe]

A lot people over 200 kg??? I weigh 82kg.
o, You fat Americans

 

[CANPRO]

europipe...200 kgf is most definitely not sufficient. If you design an anchor to 200 kg you will find yourself an anchor size that is unreasonably small...and no one will clip onto it (I know I wouldn't).

Try sizing an anchor for 5000 lbs (22.2 kN) and you will come up with a very manageable size for your anchor. 5000 lbs isn't really that large of a load to deal with.

 

[europipe]

Dear Caneit, it's not the design of the anchor that worries me,
but the structure of the roof.
Why design it for 22.2 kN when aprrox. 2 kN is needed.
And what code?

Greetings

 

[CANPRO]

In Canada it is specified in local Occupational Health and Safety documents. It is also listed in various CSA (Canadian Standards Association) codes...the various CSA standards refer anchor design to CSA-Z271 Safety Code for Suspended Platforms.

Why do you think it only needs to be 2 kN (450 lbs)? As mentioned earlier, if someone takes a fall with a shock absorbing lanyard the fall arrest force is 900 lbs. If someone isn't wearing a shock absorbing lanyard that number gets a lot of bigger...I don't have the reference infront of me, but I know that it doesn't take a very large drop to develop these forces.

And if the anchor isn't a worry for you, then the structure should be even less of a worry for you...surely you can size a beam to take a 22.2 kN point load.

 

[BAretired]

The thread title is a misnomer. It asks the design force for a person hanging from the roof. OSHA is concerned about a person falling while attached to the roof. The weight of person is magnified as a result of gravitational acceleration.

BA