Prestressed Concrete Column Design 1

[KimWT]

Hi!

I am looking for PRACTICAL guideline/information regarding prestressed concrete column design.
I am not sure current ACI318 can handle prestressed columns; I saw some papers and articles refer to this issue.
Even PCI has not updated design guideline after mid-80s.
I think prestressed columns are very common in the precast concrete industry and bridge construction.

Please share your knowledge and experience about prestressed concrete column design.

Thanks!

WT

 

[jayrod12]

Pre-cast columns are quite common, however as was alluded to in another similar post, pre-stressed is not incredibly common as the savings in column dimensions is typically not worth it.

Think about it rationally, I have this column that is intended to support compression loads. So I'm going to try and make it better by pre-applying a bunch of compression loads. That's like saying I'm going to get out of my short term debt by taking on a bunch more long term debt. Seems a bit odd no?

 

[BUGGAR]

Check out prestressed concrete piles. There used to be a series of moment interaction diagrams for various pile sizes, shapes and amount of prestressing force. I thought this was a PCI publication but I will have to look it up.

 

[Ingenuity]

PCI have a free EXCEL spreadsheet for calculating interaction diagrams for pretensioned sections (intended for piles, but could be used for axial/moment to pretensioned columns). 2nd Edition, dated 2015 - so fairly recent (or brand-new in code-years).

You can download the free Excel file by using this:

It has a companion document (manual and instructions for the Excel program) entitled: Calculation of Interaction Diagrams for Precast, Prestressed Piles, 2nd Edition (PD-01-15)

Go here to get the document: Link and scroll down to the relevant document and it will email you a download link for the PDF, after you log-in (free too).

 

[IDS]

Thanks for the reminder about the PCI site.

To download the pdf (and some other free pdfs) I had to re-register and log-in under my own name, but it's all free and easy.

Doug Jenkins
Interactive Design Services

http://newtonexcelbach.wordpress.com/

 

[PROFR]

The design of prestressed columns is covered in the ACI Code in sections 10.3.6 and 18.11 in the ACI 318-11 and the corresponding sections in the ACI 318-14 one. Prestessed columns are preferred by many precasters for faster cage construction and better handling. You can use PPC Column Software from this Link to construction the interaction diagrams of prestressed and/or non-prestressed rectangular column sections.