(a)
(b)
(c)
(d)
Figure 6: Failure pattern of column specimens. (a) 12L-0.2 (3.5% drift); (b) 12L-0.6 (1.75% drift); (c) 9L-0.2 (4.0% drift); (d) 9L-0.6 (1.75% drift).