Parking Garage modeling in RAM SS
Parking Garage modeling in RAM SS
(OP)
thread726-230354
RAM SS does model flat plate, two way slabs without spandrel beams.. the only problem is that to do it you must call it a semi-rigid diaphragm, which causes a problem with your lateral (rigid diaphragm) action.
My question- how did you model the ramp from floor to floor? I am having difficulty modeling the ramp, and getting accurate lateral load distribution into and outof these "dummy levels". More specifically, I am getting lateral load into and outof levels where there is no connection to the diaphragm.
RAM SS does model flat plate, two way slabs without spandrel beams.. the only problem is that to do it you must call it a semi-rigid diaphragm, which causes a problem with your lateral (rigid diaphragm) action.
My question- how did you model the ramp from floor to floor? I am having difficulty modeling the ramp, and getting accurate lateral load distribution into and outof these "dummy levels". More specifically, I am getting lateral load into and outof levels where there is no connection to the diaphragm.






RE: Parking Garage modeling in RAM SS
RE: Parking Garage modeling in RAM SS
Is that what you did?
RE: Parking Garage modeling in RAM SS
RE: Parking Garage modeling in RAM SS
RE: Parking Garage modeling in RAM SS
In RAM SS (RSS) you have to model the tiers in a parking garage with dummy levels (in RISA you do not but I am concerned with the time it will take)and unfortunately those dummy levels are modeled trapezoidal in shape due to the shearwall locations. I am concerned that the trapezoidal dummy walls are analyzed in the program with unrealistic rigidities. Also, I am having the much more serious problem of load distribution in and out of dummy levels that are not connected to the diaphragm.
Because of this I have modified the model to semi-rigid diaphragms (instead of rigid), and it looks like its solved that issue but now my semi-rigid diaphragm is having to resist horizontal loads at the ramp without the help of the beam elements and is undulating like the ocean.... it appears to me that no matter what I do with RSS there will be significant inaccuracies.
Any suggestions?