Ground Motions and Structures - Earthquake Engineering for Structural Design - page 319

Ground Motions and Structures 319

Figure 8.21 Behavior of structure under static lateral loads: global collapse
mechanism (Gioncu and Mazzolani, 2002)

considers that all the plastic hinges are ductile (the ductility capacity in the critical
range is larger than the ductility demand).
Contrary, a dynamic approach corresponding to the pulse seismic ground motion
provides the plastic mechanisms presented in Figure 8.22, which shows the succession
of plastic hinges formation (using the DRAIN-2D computer program), the collapse
mechanism being produced at the top of the structure. No global collapse mechanism
occurs if the pulse seismic action is considered. So, the determination of the collapse
mechanism, in addition to the structure dimensions, requires considering the type of
seismic action, which is essential to be taken into account.