ABSTRACT
It is well known that three important aspects in seismic design are strength,
ductility and hysteretic behaviour. Strength and ductility can be seen from Figure
6.1(a), i.e. the yield load P
and the ductility ratio '
/'
(to some extent represents
ductility) which will be discussed in Section 6.3.1. Hysteretic behaviour can be
demonstrated using Figure 6.1(b), where P and M are applied load and bending
moment, and ' and I are displacement and curvature, respectively. General
principles about seismic design can be found in AISC (2002) and Hajjar (2002).
They are applicable to composite tubular members.
