×
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

Design of concrete diaphragm between concrete filled pipe piles

Design of concrete diaphragm between concrete filled pipe piles

Design of concrete diaphragm between concrete filled pipe piles

(OP)
Our client has suggested looking at designing re-enforced concrete diaphragm between pipe piles on a pier bent (single row) with a precast concrete cap, approx. 5m unsupported pile length. The pipe piles will be re-enforced/concrete filled. The river in question has some significant ice loads requiring a more rigid bracing system. Looking for some design references or other design information. Trying to determine what factors to consider as the pipe pile rigidity should govern the deflection and moment under lateral loads.

RE: Design of concrete diaphragm between concrete filled pipe piles

You can use the ordinary codes to design the elements of your structure. In the context of bridge, AASHTO provisions would be normally the preferred. So one would look for weldment to the steel sheath or even anchors within the concrete. Provisions for the separate strength of the piles as composite members (in-filled pipes) you have in the AISC code as well. And everything for concrete (splices, reinforcement of shearwall panels or akin) in ACI codes, 318 mainly.  Methods of chemical bond for anchors from the providers themselves as by them warranted, or by some code.

If the diaphragm does not come till the precast concrete cap (or ground), you may need to care for the effect of the diminished slenderness in the free part of the columns for earthquake forces, for ductility would be severely diminished. So check the convenience in such case of going to such cap and foundation.

If the region is prone to severe earthquakes, one might dedicate special attention to the ductility of the connections. Maybe a length of the splicing connectors should be left unbonded, or at least everything calculated to stand the number of strong motion cycles that can be expected at the local seismic level.

One might even design the connections to exercise friction at the connection with the diaphragm itself as a way to get controlled dissipation of earthquake forces. This looks as being more than what asked for by the client, that seems just interested in a reinforcement, not a replaceable system of fighting earthquake action.

RE: Design of concrete diaphragm between concrete filled pipe piles

Try www.pilebuck.com go to books. the books on marine construction or coastal construction. (You may have to check with them to get the right book)

RE: Design of concrete diaphragm between concrete filled pipe piles

(OP)
Thanks for the advice

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