Post Tensioned Concrete(2)

[cecil123]

Hi:

To add to my earlier post the question 2 below --

I am relatively new to the design of pre stressed concrete (studied way long).What I want know is, that when checking for ultimate limit state, the applied moments are specifies as "secondary moments + factored dead&live load moments".These are compared with the section moment capacity.What I want to know is :
1)Why these SECONDARY MOMENTS/HYPER STATIC are treated as external moments?
2)Why can't we also treat primary moments also as EXTERNAL MOMENTS?

 

[rapt]

cecil123

How can you possibly think you can presponsibly produce a prestress concrete design program if you know this little about PT design.

Reading a software manual and asking questions on a site like this are not sufficient to teach you enough about PT design to allow you to do this properly.

I think it is about time people stopped answering these questions and that youy undertake a worthwhile course on PT design and then practice it for about 10 years (without computer assisatnce) so that you know what you are doing before you try to write the software.

 

[rahuldby]

Cecil123 -

As rapt suggested, it will be really helpful for you if you can start working on actual PT Design before you can actually write a code to automate the design procedure. You can find loads of information about PT design at

http://www.adaptsoft.com,

http://www.cement.org

and other related websites. The best resource I would say would be PTI manuals. The questions you asked are pretty basic and even I wasn't so sure when I first started working with PT design. But, these concepts would be self-explanatory once you start digging into the books. The best way to learn PT design is by solving a simple example by hand. That is how I started it and even now I do the same before I include any software generated results into my design. Hope this helps and good luck with your project.