"(Thread 1) CCFEModelexc. The execution is killed due to violation of step divergence criteria.

Source line: 1289, file:

..\..\Sources\Structures\execute_model_load_step_Al_LS_me

thod.cpp, last modified at: Mar 28 17:13:35 2018

I tried many times to fix the divergence error as given in

Troubleshooting manual but could not able to fix it.

Please guide me, in order to solve such issues??

How to avoid divergence of steps.??

Kind regards

Muhammad Safdar

Sometimes I need to compare calculated diagrams in Atena Studio with a diagram obtained from tests. One of the possible ways is to export monitoring points to Excel and compare diagrams there. However, sometimes it would be more convenient to compare diagrams directly in Atena Studio.

I found a way to do this with reinforcement diagram: I define a diagram which I want to see and create a dummy rebar in the model. Then I use monitors for this rebar to insert diagram into calculated diagram (model and screenshot are attached).

However, I'd like to know whether there is a more simple way.

I am modelling the slab of a floor of a high-rise structure. I currently have the slab and all of the columns below the slab modelled. Since the response of the floor slab is of most importance for my study, it is being modelled using 3D IsoShell elements. The top half of the columns (which connect to the bottom surface of the slab) are being modelled using volume elements and to reduce the number of elements, the bottom half of the columns are modelled using 1D beam elements. For the column modelling, the fibre element has been placed directly beneath the centre of the volume element, with the proper s and t dimensions as the column it is to be connected to.

I am having difficulty trying to connect the 1D beam to the volume element above it. I attempted to use '1D_Fixed_Beam_to_Solid_for_Surface' which only allows me to define a ‘Solid’, but how am I supposed to define the ‘1D beam’ portion of the connection? I have read 5.2 of Part 8 – User’s Manual for ATENA-GiD Interface, and have been unsuccessful in my modelling so far and have not found any other threads in the forum or sections in any other manual. I do not feel I am to be using any other of the '1D_Fixed_Beam_to_Solid_for...' which leaves me at a roadblock.

Any help is appreciated,

Patrick

how to modeling an embedded composites grids in the RC beam using ATENA Software

Best regards

]]>I am trying to set monitor on rebar in "Monitor for Reinforcement" window in GiD but I have no monitors in Atena Studio. MaxMonitor for Line doesn't work with rebar as well.]]>

I am simulating an interface failure model using ATENA 2D for which I use quadrilateral elements and interface elements for my model. Is there a way to know whether the finite elements that I am using are linear or quadratic?

Codes for the respective elements are CCIsoQuad and CCIsoGap but no specific distinction between finite element type is given. Is this information provided in the manual somewhere? I checked the manual for GiD as well, in that number of nodes is specified in the code for example, IsoQuad<xxxx> for linear elements, IsoQuad<xxxxxxxx> for quadratic elements. However, I cannot find a clear distinction like this while using ATENA 2D.

Kindly guide me in this matter.

]]>My name is Jeff, and I am trying to model bond-slip for smooth reinforcing bars. I would like to model a straight bar segment connected to a 180-degree hooked anchor (i.e. two bond models for the same reinforcing bar). Research by Fabbrocino et al. (2004 and 2005) have shown both to be significant in older RC structures.

I’ve read some previous posts related to this subject. One post from 2013 by Francesco who was attempting to model two bars in series but found that the 1D truss elements were not directly connected but were connected only through a transfer of forces with the surrounding concrete elements.

Another post by njoukhadar in 2019 appeared to be attempting something similar, but the final solution wasn’t clear. The user may have sent in his/her model and received additional help, but this was not posted in the forum.

I have attempted to model two 1D reinforcement bars in series: (1) having low bond quality and (2) with the bond properties associated with a hooked anchor. The force transfer and damage to the surrounding concrete suggests that the bars are not attached together. I was wondering if there is a solution for this such that I can connect the two bars in series with different bond models? Your help would be greatly appreciated.

Kind Regards,

Jeff

I'm running into some convergence issues. I had previously made 2D (deep)beam models using the SBeta material model, no issues there, however my professor suggested running the same model with the 3D non linear cementitious 2 material model. However, as soon as the model goes past the linear elastic load it seems to be unable to reach convergence. I've tried the various suggestions given in troubleshooting 2.1.19, severely reducing step size, changing to the modified Newton-Raphson method, none of which seem to help the model reach convergence. It feels like I'm missing something but I cannot seem to figure out what.

I know from experiments the failure loads for the normal beams(h=300), which isn't reached yet at the linear elastic loads, so I don't think this is structural collapse. For the deep beams(h=1200) the linear elastic load from Atena is higher than the failure load obtained in the experiments, so this might be structural collapse.

I would like to hear your suggestions on how to handle this.

Edit: seems like I misinterpreted the modified Newton-Raphson solution to convergence issues. I was using this for all load steps rather than just the problematic steps. I'll do some more testing with this.

]]>I am trying to model the pullout behavior of a reinforcement bar (as 1-D discrete bar) embedded in UHPC using GiD 11.0.8 as the pre-processor and ATENA 5.6.1i as the FE program. Because of the geometry and load conditions in the experiment, I would like to employ symmetry boundary condition in the simulation. I am going to send the sketch of the specimen as well as the picture of the test set-up to cervenka@cervenka.cz soon after posting this message.

After reading the clause "2.2.12 How can I model a pull-out experiment?" in the ATENA Troubleshooting manual I have the following questions:

1. If the symmetry line runs through the middle longitudinal bars, will it be a problem to assign symmetry boundary condition to the discrete bars (lines)?

2. Since I need to apply symmetry boundary condition to the concrete surface as well, will this condition conflict with the line symmetry condition on the discrete bars?

I have tried to run the model (created according to the clause 2.2.12 in the ATENA Troubleshooting manua) using the above conditions but the execution is aborting right after the first step. Hence, I would like to eliminate the problems causing the early termination of the analysis.

Thank you,

Manish Roy

I hope this message finds u well,

My model is continuous beam strengthened with an advanced material, when i did that, it took a long time to make analysis and i considered all the points in Troubleshooting Manual 2.2.17 except the symmetry point. So, i can simulate my beam and study that with the half shape, but in that case, the middle support at the half total length, i put at the end of the half shape to know the program that there is a support here after symmetry, or identify the surface at the end of the symmetric part with the same characterestics of the middle support (restrained in x,y,z) instead using the support. please reply to me asap.

Thanks

]]>I am trying to import results from a heat transfer analysis from another software into my 3D model in Atena Science using GiD. I wish to run a static analysis using the difference in temperatures from the previous analysis as a thermal load. The results from the previous analysis have output the temperature at nodes for the required time steps. The geometry and mesh for both analysis are the same (both prepared in GiD).

Am I able to manually alter the input file for the temperatures (the *.bin or *.thw file)? Is there another way I can input this thermal load?

Thank you,

Natalie

]]>Here is a user from Michigan Technological University, MI, USA.

We are using Science GID to simulate the softening behavior of fiber-reinforced concrete. By reading your theory and some published references, I found there is a software called Consoft, but the link (Consoft - software documentation (2015).

Available at: http://bauwesen.htwk-leipzig.de/nc/de/f … e/slowik/) shown in your publication seems expired.

Could you please help me to find out a link or contact information to access this software?

Thank you and look forward to hearing from you!

Regards,

Nate Wang

I have the following error in GiD while trying to run analysis.

```
Error in base file 'C:/Program Files/GiD/GiD 14.0/problemtypes/Atena/include.src.bas/../include.src.bas/WriteChild_CombineMaterial.bas' at line number 1: word: 'Activate_Concrete' doesn't exist
Error in command MatProp
Error in base file 'C:/Program Files/GiD/GiD 14.0/problemtypes/Atena/include.src.bas/../include.src.bas/WriteChild_CombineMaterial.bas' at line number 1: Error into an *if expression
```

The problem is Creep. Script version 16595, GiD 14.0.2 Win x64, Atena 5.6.1, Windows 10 x64.

Model: https://drive.google.com/open?id=1pqfDK … osz0kkArCo

I hope this message finds you well.

Is it reasonable to increase the error of convergence criteria when increasing the number of iterations or changing the step length doesn't lead to convergence in static analyses? For instance, increasing the error of absolute residual forces to 5% while other criteria remain at their default value.

I've checked boundary conditions, material, mesh size,etc.

Best Regards,

Hamed