Thanks GregLocock,
But I have already checked the structure mass, even frequencies from building are 3.14hz in NS, 3.25 EW, 5.56 torsion and 7.89 vertical, but from the model we get 1.55 NS, 1.72 EW, 1.91 torsion and 3.63hz vertical.
Since we have lower frequencies, it seems our model needs be...
We need to create a model of 2-story bldg. using technics of identification of systems to calibrate natural frequencies. Using SAP2000 program we create a FEM model with frames and shells, but we are still far away the convergence to the frequencies obtained from experimental methods.
My...
