×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

designforce of a person hanging under a roof

designforce of a person hanging under a roof

designforce of a person hanging under a roof

(OP)
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

RE: designforce of a person hanging under a roof

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

RE: designforce of a person hanging under a roof

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.

RE: designforce of a person hanging under a roof

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

Greetings

RE: designforce of a person hanging under a roof

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

RE: designforce of a person hanging under a roof

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!!

RE: designforce of a person hanging under a roof

(OP)
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  

RE: designforce of a person hanging under a roof


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

RE: designforce of a person hanging under a roof

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

RE: designforce of a person hanging under a roof

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.

RE: designforce of a person hanging under a roof

(OP)
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

RE: designforce of a person hanging under a roof

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.

RE: designforce of a person hanging under a roof

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

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources