I have one experimental study with only basic properties. But I need detailed nonlinear properties for DIANA micro modeling. So how can I obtain all these parameters ? Plz help me. Is there any test result or theoretical formula for burnt clay brick properties ?
Hi Chandni,
Hope your doing well with your model. the attached paper might help you to construct constitutive model for masonry and mortar .
Best regards
Hi Hossam,
i'm so interrested in this topic can you please re-upload this document. i can't download it !
Thank you
I conducted research on masonry walls with solid ceramic bricks subjected to a vertical shear. What are the parameters you need exactly?
Dear Adam,
For total strain crack model (brick) and interface element (mortar ), i need following properties.
Brick
fc
Compressive Strength
ft
Tensile Strength
E
Modulus of Elasticity
v
Poisson Ratio
GfI
First Mode Fracture Energy
Gfc
Fracture Energy in Compression
Interface
fc
Compressive Strength
ft
Tensile Strength
c
shear strength of the joint (cohesion)
Kn & Kt
Elastic properties of the interface
Tan φ
tangent of the friction angle
GfI
First Mode Fracture Energy
GfII
Second Mode Fracture Energy
Gfc
Fracture Energy in Compression
Tan ψ
Dilantancy angle
Tan φr
Residual friction angle
d
Softening Parameter
Cs
Shear traction contribution to the failure
u
Confining normal stress
Kp
Equivalent relative displacement
There are parameters which i obtained from material tests:
Brick:
fc = 28,8 N/mm2 - from full bricks
fc = 23,2 N/mm2 - from cores fi60x120 cut from bricks
ft = 1,40 N/mm2 - from splitting of full bricks
ft = 1,31 N/mm2 - from direct tension of cores fi60x120 cut from bricks
E = 3910 N/mm2 - from full bricks
E = 3570 N/mm2 - from cores fi60x120 cut from bricks
v = 0,179 - from full bricks
v = 0,131 - from cores fi60x120 cut from bricks
I didn't specify GfI and Gfc, but maybe plots in attached file will be useful for you
Mortar:
fc = 9,71 N/mm2 - from cube samples
fc = 7,63 N/mm2 - from stocky cylinders fi80x80
fc = 7,03 N/mm2 - from slender cylinders fi60x120
ft = 0,492 N/mm2 - from splitting of cylinders fi80x80
ft = 0,521 N/mm2 - from direct tension of cylinders
Interface:
c = 0,425 N/mm2 - from triple brick test
Kt = 138 kN/mm - from triple brick test
I know nothing about Kn, GfI because i didn't measure displacements (strains) during direct tension tests of two bricks joined with mortar; mean tension strength of such specimens was 0,011 N/mm2.
Friction coefficient = 1,061 - from triple brick test
Residual friction coefficient = 0,845 - from triple brick test
d = 0,373
I didn't specify the rest of the parameters, but maybe you will be able to interpret something ftom plots in attached file.
Good luck
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