(08-24-2009, 04:23 PM)fashion Wrote:(08-24-2009, 01:19 PM)essenza Wrote:(08-24-2009, 01:14 PM)fashion Wrote: yes of course is static and of course trying to model earthquake as a static load or a dynamic load under static analysis is a bit aproximate, but what else can you practically do?
Oh no i think you don;t understand what i mean, dynamic load under static analysis I just get confuse:(
you mean that the formation of the stifness matrix refers to static only analysis?
no there are two different approach for vibration analysis which have different stiffness matrix. Just be careful if you are using the one used in ETABS, SAp and all those structural analysis software unless you understand the problem at hand.