Join
Eng-Tips Forums
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Member Login
Remember Me
Forgot Password?
Join Us!

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!
Join Eng-Tips
*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.
Jobs from Indeed

Link To This Forum!

Partner Button
Add Stickiness To Your Site By Linking To This Professionally Managed Technical Forum.
Just copy and paste the
code below into your site.

Different approach

Different approach

(OP)
I have a question regarding cast in situ bridge girders relative to a load imposed considering pre-tensioning and ultimate elongation of strands.

Specific details;

Length of span = 30M
Grade of Strands = 270k / 0.6"
Pre tension imposed = 19500kg / Strand
Neglect compression effects of concrete girder.
Load = UDL of 270Te (270000Kg)
Neglect any Dynamic inputs – only consider as a static load.

I'am aware of AASHTO std however using Hooke's law principles is there a way to calculate Sigma / Epsilon / x elongation; given the pre-load applied..? guess it won't be as simple as to '-' the pre-load off the imposed load...

Thanks for any replies! – I know it's a bit different.
 

RE: Different approach

I guess you could do a deflection based on load and obtain the equation of that curvature. Then the elongation would be the arc length of that geometry less the length of the undeflected member. This is the classical approach to beam design taught in static courses with a little bit of calculus.

Regards,
Cockroach

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!
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