determineted modal particpation factors and phisTopFloorDirn

[tyqh03]

I also curious to know how to determinate the modal participation factors as I want to do response spectrum analysis. However, I find difficulty in get the Mass Matrix of the model. If the Mass Matrix could be get, then the solution of modal praticipation factors may become possible.

[vesna]

Neither mass or modal participation factors can not be recorded with OpenSees. However if you know C++, you can go to the source code, find it and spit it out.

Mahmoud, what do you mean by phisTopFloorDirn?

[vesna]

Sorry Mahmoud, but I do not speak any french.

[bravejbc]

vesna wrote:
> Neither mass or modal participation factors can not be recorded with
> OpenSees. However if you know C++, you can go to the source code, find it
> and spit it out.
>
>Dear vesna，
I am reading the source code. Would you please give me much more details about finding and spitting out mass or modal participation factors.Thanks a lot!

[vesna]

You will have to write a code in C++ to do it. I am not that advanced user of C++ to be able to help you with this.