retrofitted column modeling

stealth_mode · Post by **stealth_mode** » Wed Feb 28, 2007 5:23 am

Hi,

I want to perform successive dynamic analyses on a retrofitted frame.

I will firstly analyze the original R/C frame, then, before proceeding to the next dynamic analysis, I will analytically retrofit the damaged column elements with modeling the jackets. Is it possible in OpenSees?

silvia · Post by **silvia** » Wed Feb 28, 2007 7:17 am

the concrete model with lateral-confienemtn effects is still under developement -- Prof. Mosalam at ucb is working on it.
you might just want to increase the concrete strength in that region.

stealth_mode · Post by **stealth_mode** » Wed Feb 28, 2007 10:50 am

Thanks a lot, Silvia!

As you've expressed, neglecting the lateral confinement effects at this stage, I can increase the strength in that region (jacketing region). But, I think we can not modify an existing element between the analyses in OpenSees and we can only handle this by removing the element and defining a new one. But there is a problem in this case, we will lose the material stage of the damaged column element (degraded stiffness and strength values of that element). What about this? Am I wrong?

silvia · Post by **silvia** » Wed Feb 28, 2007 3:55 pm

i don't know, really....

robby_fr · Post by **robby_fr** » Fri Apr 20, 2007 3:52 am

Hi, I'm a researcher of university of Bologna, Italy, I work with prof. M. Savoia and B. Ferracuti.
For long time my working group studies the effect of FRP-confinement in RC columns. Prof. Savoia developed an iterative cyclic constitutive law for FRP-confined concrete for circular and rectangular cross-section under axial and flexural loading. We implemented the proposed constitutive law in Opensees. I really appreciate if you want to receive our file and if it is possible to include it in opensees.
thank you for your attention.
best.
roberto.

silvia · Post by **silvia** » Fri Apr 20, 2007 7:32 am

please contact Frank McKenna directly. you should make sure you have examples and validations ahead of time.

xiaoqg2003 · Post by **xiaoqg2003** » Wed Sep 16, 2009 12:03 am

[quote="silvia"]the concrete model with lateral-confienemtn effects is still under developement -- Prof. Mosalam at ucb is working on it.
you might just want to increase the concrete strength in that region.[/quote]

is the model proposed in the followning paper
"A computational model for reinforced concrete members confined with fiber reinforced polymer lamina" available in the new opensees now?

I think it is a reasonable method to consider FRP confinement in RC column subjected to cyclic lateral loading

fabbrob1 · Post by **fabbrob1** » Wed Sep 16, 2009 6:56 am

[quote="silvia"]the concrete model with lateral-confienemtn effects is still under developement -- Prof. Mosalam at ucb is working on it.
you might just want to increase the concrete strength in that region.[/quote]
......it was 2007......

A part from increasing the concrete strenght, are there any other method to simulate this behaviour (frp confinement)?

silvia · Post by **silvia** » Wed Sep 16, 2009 9:39 am

not right now.

danusaht · Post by **danusaht** » Wed Sep 16, 2009 11:59 am

Hi,
I was wondering if the group from Bologna did implimented in OpenSees their model for FRP column confinement. If the answer is YES I would like to use your model in my research project.
Thanks

xiaoqg2003 · Post by **xiaoqg2003** » Wed Sep 16, 2009 11:39 pm

[quote="silvia"]the concrete model with lateral-confienemtn effects is still under developement -- Prof. Mosalam at ucb is working on it.
you might just want to increase the concrete strength in that region.[/quote]

Dear Dr. silvia,

about you suggest
"you might just want to increase the concrete strength in that region.";
do you mean define a concrete material like this

uniaxialMaterial Concrete01 2 -6.58 -0.00285 -8.94 -0.0131

I have defined the second branch as a ascending branch.

xiaoqg2003 · Post by **xiaoqg2003** » Wed Sep 16, 2009 11:42 pm

[quote="robby_fr"]Hi, I'm a researcher of university of Bologna, Italy, I work with prof. M. Savoia and B. Ferracuti.
For long time my working group studies the effect of FRP-confinement in RC columns. Prof. Savoia developed an iterative cyclic constitutive law for FRP-confined concrete for circular and rectangular cross-section under axial and flexural loading. We implemented the proposed constitutive law in Opensees. I really appreciate if you want to receive our file and if it is possible to include it in opensees.
thank you for your attention.
best.
roberto.[/quote]

Dear robby_fr,

Has this work been published? Then, I can read the corresponding paper

silvia · Post by **silvia** » Thu Sep 17, 2009 6:40 am

you should search for it

The OpenSees Community

retrofitted column modeling

retrofitted column modeling

FRP-confinement in RC columns

Re: FRP-confinement in RC columns

Re: FRP-confinement in RC columns