×
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

Connection between drag truss and post

Connection between drag truss and post

Connection between drag truss and post

(OP)
Hello,

I need help coming up with an adequate fastener between the drag truss and the posts supporting it.

After calculating the drag strut force, it comes out to be about ~4500 lbs, and it's being supported by a 7x7 post each end.
The drag truss length is 36.25'.

How would I go about calculating the force at the support so that I can provide adequate connectors to transfer this drag strut force to the post?

Please let me know if there's any other information I can provide. Thank you!

RE: Connection between drag truss and post

A sketch would help.
Assume this is a wood structure?
Drag trusses collect lateral forces and usually deliver those forces to a shear wall, a brace, or a moment frame. Not sure what you mean by “post”.

Wind or seismic or both?

Check out Eng-Tips Forum's Policies here:
FAQ731-376: Eng-Tips.com Forum Policies

RE: Connection between drag truss and post

(OP)
JAE

Yes, this is a wood structure. My boss drew a plan that had a drag truss laying on top of a 7x7 wood column at both ends and told me to calculate the drag strut force which I was able to do.
However, I'm not so sure about the connection to the columns. Am I supposed to calculate the uplift force based on the drag strut force?

To simplify the plan looks something like this

-----------------SHEAR WALL-------------------------
| |
| |
| |
| |
| |
| |
7x7 POST------------DRAG TRUSS-------------------7X7 POST
| |
| |
| |
| |
| |
| |
-----------------SHEAR WALL-------------------------

*the second vertical dash line represent the right side wall (could not get it to space correctly)

This is for seismic.

Thanks

RE: Connection between drag truss and post

I wouldn’t call that a drag truss. As I mentioned above a drag truss actually collects and drags lateral forces from a diaphragm into some element that serves as a lateral brace for the structure.

In your sketch the truss you call a drag truss isn’t dragging anything. It is at the center point between two shear walls so it really has very little lateral forces in it.

The columns offer no lateral stiffness so there won’t be much lateral force between them and the truss. Just some local wind uplift and the vertical gravity loads.

Check out Eng-Tips Forum's Policies here:
FAQ731-376: Eng-Tips.com Forum Policies

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

White Paper – Your Construction ERP RFP Checklist
Selecting business software for a medium to enterprise-sized construction concern is extremely challenging in large part because most enterprise resource planning (ERP) suites originated in the world of repetitive manufacturing and are therefore a poor fit for a project and asset-centric business. However, midsize to large contractors need the predictable, auditable processes that ERP delivers. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close