×
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

Cracking RC-member in bending

Cracking RC-member in bending

Cracking RC-member in bending

(OP)
Hi all,

I'm working on a simulation of a reinforced concrete beam in bending.
It's a 2D-model, where i want to simulate the discrete cracking pattern of the beam in a 4-point bending test.

I created a cohesive zone model to describe the descrete cracking pattern.
However this model does not convergence when i'm trying to solve it in Abaqus (both static general and Risk solver).
Though the first 20% of the calculation that are completed give correct results (compared with experimental research: both the load-displacement graph and the cracking pattern are correct).

Now to improve convergence i was thinking of creating a dynamic explicit analyses since the high non-lineazrity of the problem.
However when running this dynamic analysis all kind of strange displacements occur in my model, which are obvious not correct, see the image below.
Does anyone know why changing my solver to the dynamic explicit causes these weird displacements?



Thanks in advance for any help!

RE: Cracking RC-member in bending

(OP)
The image in the post above doesn't seem to work.

These displacements are occuring when using dynamic explicit analysis

RE: Cracking RC-member in bending

(OP)
I used a deformation scale factor of 75 to show what is actually happening.
The model consist of a 4-point bending test, where only half of it is moddeld (to save computation time), the symetrie axis is on the right.
The beam is supported on the left, and the displacement is placed on a steel block on top (the displacements is pointing down).

Thus there is no reason why cracking of the concrete can occur over the full heigth of the beam (so in the compression zone as well!)
And also on the left of the model, where large deformations and cracks are occuring, no cracking is expected.

Changing the deformation scale factor only influences the visual output.
I only used this, to show what is actually happening in the model.


I can post an image with a deformation scale factor of 1 as well.
But you are not able to see what is actually going on.

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