Problems with Mazars' model

1

I’m trying to model a concrete structure made of shell elements with the FE software Mecway, which allows the CCX solver to be used to run the analysis.
I’d like to use the Mazars’ model for the concrete elements but I can’t get meaningful reasult from the analysis.
In details, I’ve tried to model the material though the following code:

**USER MATERIAL (MFRONT)
*MATERIAL, NAME=@CALCULIXBEHAVIOUR_UNILATERALMAZARS@ARCH

*DEPVAR
6

*USER MATERIAL, CONSTANTS=9
8000.0, 0.2, 1.0, 1.0e6, 1.0, 1.0e3, 0.05, -3.0,
6.25e-6

** YoungModulus>, , , , , , <st_max>, <sc_max>,
**

*SHELL SECTION,ELSET=ARCH, MATERIAL=@CALCULIXBEHAVIOUR_UNILATERALMAZARS@ARCH
3

*DENSITY
2100e6

First of all, even if no gravity load is specified, it looks like the density must be specified to run the analysis.
In addition, in order to complete the analysis, the density value must be huge.
Finally, the concrete structure seems not to deform under the applied loads.

Do you have experience in modeling concrete structure with the Mazars’ model?

Thanks,
Andrea

2

hi,

there’s no update for the patch of output problems in Mazars unilateral models, but you could try a previous one.

also, concrete material in CalculiX could be modeled as Compression_Only material w/o some limitation of tension values. another material type can be use with MFRONT libraries copied (e.g Modified Mohr Coulomb, Drucker Prager w/o Cap, Mazars classical).

however, i guess about your FE models using shell element. did it layered (composite) with steel reinforcement provide?

best,

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