thread801-259595 To find the model
thread801-259595 To find the model
(OP)
thread801-259595: Find the mass of a model
To find the model masses in SAP2000 we need weight or mass, but the Output file of Joint mass contains U1, U2, U3, How we can add those? because the Unit is KN-s2/m.
I am attaching the table, Please Help me.
Thank You
To find the model masses in SAP2000 we need weight or mass, but the Output file of Joint mass contains U1, U2, U3, How we can add those? because the Unit is KN-s2/m.
I am attaching the table, Please Help me.
Thank You





RE: thread801-259595 To find the model
RE: thread801-259595 To find the model
Usually, the mass is the same for all translational degrees of freedom. Therefore, I would suggest added all the U1 mass together. All the U2 mass together and all the U3 mass together. Each one of those represents the total mass of the structure (for the specified direction). And, they are likely to all be equal.
RE: thread801-259595 To find the model
Can you please help me to find out Modal participation factor and Modal mass coefficient for a frame directly from SAP2000?
Thank You.
RE: thread801-259595 To find the model
Your equations in the other thread look basically correct. But, to do a more complex example, you need to know the mode shapes and those mode shapes should be mass normalized. I'm assuming this is what SAP provides, but I don't know. You also need the spectra accelerations and the mass matrix. Ideally, you'd also get the stiffness matrix.
It's not something that I've ever done with SAP, though I've done it with a different program. Though I was allowed to kill more hours on it than would normally be justified for a typical structural project.