×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

contact between reinforcement and concrete
2

contact between reinforcement and concrete

contact between reinforcement and concrete

(OP)
Hi!
I have to model a composite steel-concrete shear wall but I can't make to work the contact between reinforcement(including steel profiles) and concrete.Reinforcement and steel profile is modeled with LINK8 and concrete with SOLID65.
Thank's!

RE: contact between reinforcement and concrete

Hi

You can do it by modelling the rebar element with use of the Concrete nodes. Also yo can use combin39 elements to connect the rebar nodes with the concrete nodes.
There is also the option in the Solid65 element to model the rebar as a real constant for this element.
Hope this helps.

 

RE: contact between reinforcement and concrete

(OP)
I think that is a problem to do what you recommend me because the concrete element is meshed automaticaly and my rebars have a fix position by coordinates. I don't know now how to model the concrete element by reinforcement nodes.
If i use what you recommend me the contact is all aver the reinforcement surface or just in contact nodes?
About modeling reinforcement in solid 65 element, i made once this but I have some convergence problems!
Thank's for your answers.
I'm a novice in using Ansys and between my friend's nobody know's this program and that for I use this forum. I put this question also on others forums but I didn't received any answer!

RE: contact between reinforcement and concrete

Hi

If you sliced your model at the location where the rebar is located you could make sure you have corresponding nodes for the concrete and rebar. The combin element needs to be applied in the ux, uy and uz direction of each rebar node, connected to three concrete nodes.
It doesn't really matter which methode you use the convergence troubles will always be there.
 

RE: contact between reinforcement and concrete

(OP)
I will try to apply your recommendations and hope that works but I have a problem in viewing components of the model sepparately although I make two componets. one from vertical an d horizontal rebars and one from stell profiles. Which is your opinion about my model? It is to complicated? . One more question if it is posible: the load is in 70 steps as follows: from step 1 to 40 the value of the load is 400 N, from 40 to 50 the value of the load is 250N ...etc. When I look at the results I see that the program doesn't sume the step loads and gives the result's from every step load separatelly. I look in the guide and I think I have to make combinations between steps to have the result's from the sume off all step's. Is that correct?
Thank's a lot for your answers! Sorry for my english, i hope you understand my questions!

RE: contact between reinforcement and concrete

Hi,

i am going to write the settings which i use. The time and number of substebs must be set correctly. Also i prefer do not leave solution-procesor between loadsteps and put command to tell the ansys to sum the loads:

FINISH
/PREP7
...
FINISH
/SOL

TIME  , 40
NSUBST, ...
F,NODE, FZ, -400

SOLVE

TIME  , 50
NSUBST, ...
FCUM  , ADD  !!!  THIS TELLS TO ANSYS TO CUMMULATE THE LOAD
F,NODE, FZ, -250

SOLVE

 

RE: contact between reinforcement and concrete

Hi

When You apply a load of -400N and after solve change this load to 250N it becomes -250N. So apply a load of 400N in the fist 40 steps then change the value to 650N. This way the load in step 40 = -400N and in 50 -650N.
You don't need to use the FCUM commando.
 

RE: contact between reinforcement and concrete

(OP)
Hi,
Where from is this sign changing (from 250 to -250)?
If I do what you recommend me, can I view at the end of the analyse the value of stesses, displacements... in all substeps, or just in last one?
Thank's!

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources