Ground Motions and Structures - Earthquake Engineering for Structural Design - page 346

346 Earthquake Engineering for Structural Design

The variety of bolted connections is very rich in typologies: some of these types and
the most used ones are presented in Figure 8. 43 as top and seat angles, flush end plates,
extended end plates and welded flanges shop welded and site bolted. The behavior of
these connections during earthquakes and experimental tests were good, with the
exception of the case when the damage is produced for the brittle fracture of
the bolts in the threaded zone. In order to improve the behavior of bolted connections,
the use of high ductility bolts is proposed by Ohi et al (2000) and Balut and Gioncu
(2006). The ductility of bolts could substantially be increased if the diameter in the
unthreaded zone was reduced, because the bolt failure, which occurred in this zone, is
ductile (Fig. 8.44).

(a) (b) (c)

Figure 8.43 (continues)