reinforced concrete frame

[nicola27]

I made my reinforced concrete frame with two spans two floors and stuck to the base.
I want to set up the diaphragms stiff and I used the dof equal in x direction as follows,

equalDOF 21 22 1;
equalDOF 21 23 1;
equalDOF 31 32 1;
equalDOF 31 33 1;
equalDOF 41 42 1;
equalDOF 41 43 1.

I applied the mass in x direction and y in a small to solve Eigen analysis

mass 11 [expr ($ WeightCol / 2) / $ g] 0.0000001 0.0;
mass 12 [expr ($ WeightCol / 2) / $ g] 0.0000001 0.0;
mass 13 [expr ($ WeightCol / 2) / $ g] 0.0000001 0.0;
mass 21 [expr (($ * WeightinBeam 7500) ($ WeightonBeam * 2500) ($ WeightCol)) / $ g] 0.0000000001 0.;
mass 22 [expr (($ WeightinBeam * 10000) ($ WeightonBeam * 5000) ($ WeightCol)) / $ g] 0.0000000001 0.;
mass 23 [expr (($ * WeightinBeam 7500) ($ WeightonBeam * 2500) ($ WeightCol)) / $ g] 0.0000000001 0.;
mass 31 [expr (($ * WeightinBeam 7500) ($ WeightonBeam * 2500) ($ WeightCol)) / $ g] 0.0000000001 0.;
mass 32 [expr (($ WeightinBeam * 10000) (WeightonBeam * $ 5000) ($ WeightCol)) / $ g] 0.0000000001 0.;
mass 33 [expr (($ * WeightinBeam 7500) ($ WeightonBeam * 2500) ($ WeightCol)) / $ g] 0.0000000001 0.;
mass 41 [expr (($ WeightCol / 2) ($ WeightBeam * 2500) ($ WeightinBeam * 5000)) / $ g] 0.0000000001 0.;
mass 42 [expr (($ WeightCol / 2) ($ WeightBeam * 5000) ($ WeightBeam * 5000)) / $ g] 0.0000000001 0.;
mass 43 [expr (($ WeightCol / 2) ($ WeightBeam * 2500) ($ WeightinBeam * 5000)) / $ g] 0.0000000001 0.

is this right?

[vesna]

Personally, I would not use equalDOF command unless your beams are elastic. Check out this: http://opensees.berkeley.edu/wiki/index ... r_Elements

If it is part of a 3D system it also has vertical mass which is equal to the tributary mass around the column. Check out this: http://onlinelibrary.wiley.com/doi/10.1002/tal.251/pdf