What are the drawings presented for a post-tensioned slab ? 2

[JDG3718]

Hi, I have a post-tension slab I want to draw it in autocad but i don't know how many plans to present and how each plan layout, can anyone present any sample autocad or pdf showing layout of slabs presented by a company or office ?

 

[Ingenuity]

I assume you are producing such plans as an consulting engineer on a project.

Practices vary around the world. In the North America (and the US specifically) the EoR produces a PT design drawing that shows high and low points, forces, and a general layout, then the PT supplier will produce PT shop drawings that meet that design. In other parts of the world the consulting engineer will detail the PT fully - number and spacing of tendons, rebar T and B, sometimes formwork profiles too.

Where are you practicing and what do your colleagues do?

 

[JDG3718]

Actually I am a civil engineering student so I am doing this by myself, and unfortunately not for a university project (they don't teach prestress), I usually use metric system and in my country we follow all american codes and layout. If you mind, could you send some documents about how to detail such a slab ? I already ran the analysis in SAFE but I never actually drawn a post tension slab before I saw how detailing in SAFE is but it is not very much good. Thank You for your reply.

 

[Ingenuity]

Typically, in North America, besides typical notes, general details, specific details etc, the main three drawings produced by the PT supplier/installer are TENDON LAYOUT drawing, DISTRIBUTED TENDON profiles, and BANDED TENDON profiles, as follows:

The structural engineer will first produce design drawings that show the general PT arrangement, high/low profile points, forces etc., and top and bottom rebar etc. The PT supplier/installer will produce the shop drawings based upon the engineers design drawings and project specifications.

 

[dik]

Ingenuity:

Any chance you can repost the drawings in a scaleable format. When I zoom in to see the notes, the 'jaggies' totally obscure the text.

Dik

 

[Ingenuity]

dik:

Will do. But I have to first modify the PDF files to delete the title blocks etc - project the 'guilty'.

FYI - I was was NOT the EoR on this project - we just did the PT repairs consisting of de-stressing, de-greasing, re-greasing and re-stressing of several hundred tendons to a 6 year old structure. Long story.

 

[Ingenuity]

See attached PDF file. 3 PT shop drawings total. This is a PT podium deck supporting 5 levels of cold-formed steel framing.

FYI - standard US PT detailing/symbols used, so legend for tendon symbols is:

 

[dik]

Ingenuity:

Thanks very much... Dik