Aoa everyone.
Another question on modal analysis lol.
I have saw a lot of posts in the forum regarding modal analysis but still have questions in my mind. Sorry if questions seems to be silly.
if a mode (deformed shape) in which mass is participation 90% it means that following mode is attracting more EQ force and how can we use the following mode time period in etabs as we have already define time period in static load cases (Program Calculated) ??
Secondly for response spectrum analysis it is necessary to perform modal analysis in etabs and when Etabs calculate base shear from both static procedure and RSA which one base shear is used in final design calculation by etabs ?
If time period calculate by etabs is less then Ta then we have to use Ta, so how can we change the time period in etabs to Ta ??