Post tension steel modeling

aliirmak · Post by **aliirmak** » Tue Jan 29, 2008 9:55 am

I want to model post tension steel

So far using elastic beam column element and applying an element load on it was the advised one.

I also saw somewhere in the forum that we could also use initially displaced truss element to model post tension.

Could someone explain how we can initially displace a truss element.

I figured it like i am applying displacement at the end nodes of the truss element to initially displace the element.
However, applying displacement on the nodes may also cause a push over?

Secondly, is there any way to model post tensioned steel with a displacement beam column element having steel01 material property?
The element also should not carry any moment of course...

seocy · Post by **seocy** » Mon Feb 11, 2008 4:58 pm

I defined an initial strain at the EPP material used for truss element.
You can also use displacement beam column element for PT by imposing end moment release.

aliirmak · Post by **aliirmak** » Mon Feb 11, 2008 5:55 pm

Thanks too much for the help.

That epp material having an initial strain is one of the best alternatives so far.

What about end moment releases?
you mean we will release the moments at the end nodes of the element
by for example the following code:

fix $node1 1 1 0
fix $node2 1 1 0

Thanks,

Ali