rigid diaphragm
rigid diaphragm
(OP)
hi:
i'm modeling a 30 floor building in viña del mar (chile), i assigned membrane as a floor section, i have used a spectrum function as require NCh433of96 chilean seismic code. my problem is that i've assigned rigid diaphragm in all floors then i run the program an when y look joint displacement i watch in load case joints moves together but when i watch the joints displacement on any load combination it does not keep the condition of rigid diaphragm.
regards
i'm modeling a 30 floor building in viña del mar (chile), i assigned membrane as a floor section, i have used a spectrum function as require NCh433of96 chilean seismic code. my problem is that i've assigned rigid diaphragm in all floors then i run the program an when y look joint displacement i watch in load case joints moves together but when i watch the joints displacement on any load combination it does not keep the condition of rigid diaphragm.
regards





RE: rigid diaphragm
Tiene que asignarle el diafragma a cada nivel por separado, al final tendra 30 diafragmas asignados. Le da click a "plan view" y va uno por uno, los nombres de los diafragmas tienen que ser diferentes en cada piso
Diquan
RE: rigid diaphragm
Before proceeding with the design, be sure that you fully understand the fine points of response spectrum analysis. It is not the same as simple static analysis, and should be treated accordingly. For instance, all signs are lost as a result of the combination of modes, and therefore the code checks must be done assuming the worst combination of different forces (i.e. axial force and moment).
RE: rigid diaphragm
Diquan : thanks, but the rigid diaphragm definition can be used the same in all floors because it associates all the joints selected into a master joint in each floor.. but if i want to use two rigid diaphragm in each floor i need to use two diferents rigid diaphragm assignment.
RE: rigid diaphragm
RE: rigid diaphragm
RE: rigid diaphragm
gracias
thanks everybody
RE: rigid diaphragm
Mx max and its corresponding My and N max
or
Mx max and My max and N max ?
RE: rigid diaphragm
Rigid diagram reduces the degrees of freedom and makes the model run much faster. If you don't include shell element with the rigid diaphragm, you can't obtain bending moments and shears for slab design,and the bending moments and shears for the beams is samller than the real situation, the bending moments and shears for the columns is more than the real situation.
usually I modify the I33 stiffness for the beam to simulate the real situation. According to some CODES amplify 2-3 times.
Good luck
Shdma