Posted by: Ashu_chaudhary
Doubts regarding calculation of modal masses & seismic force - 04/23/15 12:30 AM
I have few doubts -
Doubt 1: How CAESAR II algorithm uses mode shapes in calculation of modal mass and modal stiffness matrices?
Doubt 2: Consider a case of seismic analysis using response spectrum method. If the modal accelerations and modal masses are known for each mode, then on simply mutiplying them- will i get the modal forces? Further, using suitable combination method, if i combine the modal forces of all extracted modes, will i get seismic forces due to the effective masses? or will i have to do something else?
kindly help me out in solving these doubts.
regards
ashu
Doubt 1: How CAESAR II algorithm uses mode shapes in calculation of modal mass and modal stiffness matrices?
Doubt 2: Consider a case of seismic analysis using response spectrum method. If the modal accelerations and modal masses are known for each mode, then on simply mutiplying them- will i get the modal forces? Further, using suitable combination method, if i combine the modal forces of all extracted modes, will i get seismic forces due to the effective masses? or will i have to do something else?
kindly help me out in solving these doubts.
regards
ashu