ABSTRACT
This paper examines the effects of structural rehabilitation on the modal parameters of the Marlo Bridge, which suffered damage to one of its pillars. Natural frequencies, mode shapes and damping ratios have been identified using time series of accelerations recorded at the site prior to and after the repair. In addition, complementary studies using the corresponding finite element model have been performed. It is shown that modal analysis can be a useful tool that gains insight into changes in structural behavior due to damage. The finite element model was able to accurately capture the dynamic behavior of the Marlo Bridge in its repaired state; however, the mode shapes obtained and the natural frequencies in the damaged state did not correspond well with those identified using measurement data and were found challenging to be reproduced.
