Ground Motions and Structures - Earthquake Engineering for Structural Design - page 321

Ground Motions and Structures 321

parts of structure or only a story of structure (Fig. 8.23). The produced mechanism
type depends on the structure conformation, but at the same time on the ground motion
type. Generally, the global mechanism and type 1 mechanism are accepted to be the
more frequent type for intraslab earthquakes. In case of velocity pulse with short
period (crustal earthquakes), the collapse is formed at the top or middle part of the
structure (Types 2 and 3 mechanisms).

Figure 8 . 23 Collapse mechanism types (courtesy of Montuori and Piluso, 2000)