three points bending test

[Marco Vailati]

Hallo,
as first, I want to thanks for your support.
I would interest in simulating 3p bending test of prismatic specimens of 40x40x160 mm dimensions, made of lime-based mortar strengthened with short fibers of different nature: Sisal, PVA, Basalt, glass. The aim is to evaluate the contribution of different fibers on the mechanical properties of the strenghtened mortar using macromodelling approach as first attempt.
Any suggestions are welcome because it is the first time I deal with this kind of modelling.
Please see the attached pictures for further details.
Thank you.

[STKO Team]

For this kind of model, you can follow one of our webinars about masonry of rc shear walls to understand how to use the DamageTC3D plastic-damage model.
We use it for both concrete and masonry.

And you can follow our basic webinars to understand how to model and setup the geometry for a 3point bending test.

However, here's a simple 2D model of your specimen. I've used the DamageTC3D with material parameters of a random mortar. I set up a monitor with your results as a background.
You can play with the material parameters to understand how it works.
In your case I would play with ft (tensile peak stress) and Gt (tensile fracture energy)

Here's the file:

mortar3ptest.zip

(175.49 KiB) Downloaded 163 times

And here's a typical output you will see:

mortar.png (39.16 KiB) Viewed 1574 times

[Marco Vailati]

Kind STKO staff,
the analysis does not run. A screenshot of the warning message is attached.
KInd Regards

[STKO Team]

It's because it set up the analysis for parallel processing with OpenSeesMP.
You should select the openseesmp solver