Hello, in ATENA, truss elements are only available for reinforcement (with only axial stiffness). Threaded beam elements are only available through the ATENA-GiD interface of ATENA Science. Layered shell elements are available through the Engineering 3D and Science/GiD GUEs.

Therefore, if you need to model a large truss structure in ATENA, you should probably work with ATENA Science. If you only have an Engineering licence, you can write us what you wish to model (see also Troubleshooting, 2.1.1) and maybe we can recommend a way...

Best regards.

Dear Sir,

I still couldn't figure it out about how to model truss system by ATENA, last time I made, it was consists a lot of errors* during analysis using ATENA Studio. I tried several times using ATENA2D as well, but I couldn't use Reinforcement material, it will give me error like "line 1 is not included in structure". could you please recommend me some other alternatives? or a tutorial (would be much appreciate).

*Note: my ATENA updated from 5.0.2 to 5.1.2.
*Errors in ATENA Studio
Warning: Principal node 13 has not been fixed while generating  macro element id: 1, name: Reinf# 1 >> # 1  type: CCDiscreteReinforcementME. (Source line: 690, file: ..\..\Sources\CCDiscreteReinforcementME\generate_elements(CCDiscreteRienforcementME).cpp, last modified at: Tue Oct  7 14:17:55 2014)
Invalid  Non-embedded macro_element_id: 1, ...and so on

Thank you.

Strut and Tie Model

meaning its not possible or what? I used it, but it keep saying that I don't have any assigned material. should I make it in 3D? so far I just try to make the truss with lines(no surface, no volume) elements connected by join.

Hello everyone,

I'm modelling a girder strengthened in shear with CFRP. I want to use 1D springs (truss elements) with a multi linear constitutive and a large deformation formulation as interface elements. I want them to connect with one node the concrete (standard element) and with  the other node the CFRP (shell element).

To model this I drew reinforcement (defined with my multi linear constitutive) connecting concrete with CFRP. For the large deformation formulation I checked the "Geometrically nonlinear analysis" box on the global solution parameters.

I'm not sure if using reinforcement outside of elements and using them to connect a standard element with a shell element is the right way to go.

Would you suggest me others ways to model springs connecting macro elements using Atena?

I didn't use Atena springs because apparently they always need to have one node perfectly fixed and I need one node to connect to concrete (brick element) and the other to the CFRP (shell element).

Best regards.

Jose

Hi dpryl,

Thank you very much for your quick response. I have read Troubleshooting 2.2.2 and I understand that in Atena 3D the suggests approach would be to use 3D Interface for the contact between the adjacent concrete element and CFRP shell.

However 3D Interface material is based on Mohr-Coulomb criterion and I want to implement a simpler model developed by (Sun and Ghannoum, 2015) with 1D truss elements with a constitutive calibrated to match experimental results. If you wish to check the model you can check it at: http://www.sciencedirect.com/science/ar … 181500375X

Do you think such model can be implemented using Atena? Also, is there any way to create 3D macroelements that only act as 1D trusses connecting two elements and only transmit axial stress?

Best regards,

Jose