To define mortar interface and brick crack interface during modeling of masonry, i need normal and shear stiffness (Kn and Kt). I found relationship to calculate these values attached here for mortar interface. But in my case Eu < Ej. So how can i calculate? And how can we estimate clay brick normal and shear stiffness to define brick crack at middle of the brick? I am using DIANA for it. Please suggest me.
You have to do direct tensile brick-mortar couplet test to determine the normal stiffness and shear couplet or triplet test to determine the shear stiffness. Otherwise there are plenty of literature have these values. Use them and calibrate with your numerical model.
In my case, young modulus for unit and mortar are very close each other, which causes extremely high values of Kn if I use the equation presented by Lorenco.
Do you know if there is any way to calculate Kn for the interface as a function of Kunit and Kmortar? Is Kn somewhere in between Kunit and Kmortar??? thanks
hello, thanks for your answer, can you give me the reference where you took it from, please, thanks. What is K and Zmin?
Dear sir
i sent you picture, answer of your question
K: is the bulk modulus
Z min: is the smallest width of an adjoining zone in the normal direction
best regards
You can get the details in following documents
Article Investigation of failure of a rigid retaining wall with relief shelves
Cervenka Consulting, Atena theory has a simple approach: Kt=G/t & Kn = E/t. See picture attached.
Louralenco's formula is for simplified micro modelling, he derived it by assuming same deformation for the real masonry unit and simplified micro unit. He equalled the def. And derived the formula, but direct shear and tensile tests gives very smaller values than the ones found by formulas, is this normal, what do you think?
Check the following link:
https://repository.tudelft.nl/islandora/object/uuid%3A8299fcce-98ab-4e0c-ae7b-c6895ec70ea1
Hi,
maybe this can help. Check the formula we derived:
Article Numerical analysis of the in-plane behaviour of decoupled ma...
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