3D Model with ShellMITC4 as Floor Slab

[alirezaarab]

Hi
I am modeling a 3D RC structure with nonlinearBeamColumn element for beams and columns and ShellMITC4 element for slabs. Defining the section of slabs with ElasticMembranePlateSection which can model the structure mass as distributed (using $rho- mass density of the material), now I want to know if OpenSEES just consider this distributed mass as nodal masses, or rotary inertia of slab considers in mass matrix as well?

Tanx

[fmk]

the mass matrix from the element only contains translational terms.

//multiply by density
temp *= rhoH ;

//node-node translational mass
for ( k=0, kk=0; k<numberNodes; k++, kk+=ndf ) {

massJK = temp * shp[massIndex][k] ;

for ( p = 0; p < 3; p++ )
mass( jj+p, kk+p ) += massJK ;

} // end for k loop