1. Add zero-stiffness plate diaphragm and add pressure load on the unit to be used as the mass source of reaction spectrum load. The problem is that it is not proper to add the zero-stiffness plates. The zero-stiffness plates and structural members cannot be calculated in a coordinated way. In my opinion, it is more appropriate to use the command of plate load floor load.
2. In the reaction spectrum condition, it is not allowed to add member load containing Lin and trap, and element pressure in the form of trap. Why ,this type is static load, why not these types cannot be in the reaction spectrum conditions?I feel curious,how the software consider about?do you.have some statement