9. Do not
confuse the Push-over with the real earthquake
loading.
•The push-over load is
monotonically increased
•The earthquake generated forces continually change in amplitude and direction during the duration of
earthquake ground motion.
•Push-over loads and
structural response are in phase
•Earthquake excitations and building response are not necessarily in phase.
•This is particularly true for near-fault ground motions which tend to concentrate the damage on the lower floors, an
effect which is difficult to model by the
push-over loads.
•The best that can be hoped for is for the push-over curve to effectively envelope the earthquake generated forces and
displacements.
