I notice that membranes do not represent 100% as a rigid diaphragm if their stiffness is not big enough. I suggest Advance auto modify the crack stiffness of those created membrane to 10000 for example so that no in-plane relative displacement is allowed inside the membrane. So it becomes a correct rigid diaphragm.
I notice that membranes do not represent 100% as a rigid diaphragm if their stiffness is not big enough. I suggest Advance auto modify the crack stiffness of those created membrane to 10000 for example so that no in-plane relative displacement is allowed inside the membrane. So it becomes a correct rigid diaphragm.