Material orthtropy

[faisal.aaouatif]

Is the definition of a material orthotroy on slabs according to x or y direction ( one way slabs ) has any effect on results in walls / columns / beams due to lateral load ( seismic or wind ) ?  

thank you.

[Artur.Kosakowski]

Assuming you reduce E value in one of the directions the effect is such as the difference in E assigned to the 'weak' direction of the slab. If you decrease it you decrease the in plane stiffness of the slab in this direction.

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[faisal.aaouatif]

assuming that the X and Y direction are the in plane axis of the slab ( the Z direction is the perpendiclar one ) ; do you mean by :

"If you decrease it you decrease the in plane stiffness of the slab in this direction"

that Changing the E value in x or y direction has no effect on the moment of inertia relative to Z axis (slab should behave as a diaphragme (...) )

Thank you

[Artur.Kosakowski]

Assuming that the rigidity against compression can be written as E*A (Young modulus * cross sectional area) if you define E in the main direction and e.g. E/1000 in the other the value of such rigidity in the other direction is decreased comparing to the main one.

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