Observed Dynamic Characteristics during Progressive Damage Test of a Flyover Bridge December 4, 2008
Posted by dionsiringo in Bridge Engineering, Destructive Test of Bridge, Structural Monitoring, Vibration, mechanical vibration, paper work.add a comment
Progressive destructive test of a structure is an important and rare opportunity to observe the change in structural characteristics. During the step-by-step demolition process, we can measure structural response and learn how the dynamic characteristics evolve. This insight is valuable in evaluating structural performance and in setting the benchmark for typical deterioration of structure. In this paper, we discuss the evolution of dynamic characteristics of a reinforced concrete bridge during a destructive test.
An instrumented box girder flyover bridge is sequentially damaged by cutting the tendons of its main span. Ambient vibration measurement was performed during destructive test and dynamic characteristics of the bridge were evaluated in each damage stage. The results show the change of natural frequencies is clearly visible as an indicator of global damage presence, while the change in damping distribution may be used as the local damage indicator.
