ABSTRACT
ABSTRACT: Chinese economy develops rapidly in recent years, so the traffic industry gains a large-scale development, especially the long-span bridges being in the ascendant. During the service time they are inevitable to suffer from environmental corrosion, material aging, fatigue and the coupling effects with long-term loads and extreme loads. The induced damage accumulates and performance degenerates due to the above factors would inevitably reduce the resisting capacity of bridges against the disaster actions, even result in collapse with the structural failure under extreme loads. Due to those reasons structural health monitoring (SHM) has more and more attracted great research and development interests of scientists and engineers in the whole world because of the ability to ensure the safety and study the damage evolving characteristics of the structures (Ou, 1996; Ou, 2003).
