Sir i know its not STKO related problem but it will be helpfull to me if i get this concept which i am finding great difficult in understanding.
In which direction the infill central node mass shall be assigned ?
I am little bit confused with the axes....
Thank you in advance
In which direction the central node mass of the infill should be assigned ?

 Posts: 38
 Joined: Mon Aug 03, 2020 5:38 pm
Re: In which direction the central node mass of the infill should be assigned ?
I do not really understand your question...
If you are using the STKOautomatism (MasonryInfillWallMaterial), you just input the gamma_inf, that is the wall density and it will take care of assigning the mass at the midnode. The mass should be assigned in the DOF along the outofplane direction of the wall.
As I said, if you use the STKO automatism, it will automatically do that.
STKO does this:
N = [Nx Ny Nz] = outofplane normal unitvector of the wall
M = (scalar) = Mass
NodalMass = [Mx My Mz] = abs(N) * M (note here I use the absolute values of Nx,Ny,Nz, because the mass will have no sign)
Now if your wall is placed in the XZ plane, then the normal vector is the Y axis, so N = [0, 1, 0], so the nodalMass will be [0, M, 0]
If you are using the STKOautomatism (MasonryInfillWallMaterial), you just input the gamma_inf, that is the wall density and it will take care of assigning the mass at the midnode. The mass should be assigned in the DOF along the outofplane direction of the wall.
As I said, if you use the STKO automatism, it will automatically do that.
STKO does this:
N = [Nx Ny Nz] = outofplane normal unitvector of the wall
M = (scalar) = Mass
NodalMass = [Mx My Mz] = abs(N) * M (note here I use the absolute values of Nx,Ny,Nz, because the mass will have no sign)
Now if your wall is placed in the XZ plane, then the normal vector is the Y axis, so N = [0, 1, 0], so the nodalMass will be [0, M, 0]

 Posts: 38
 Joined: Mon Aug 03, 2020 5:38 pm