Neda Baghiee - Assistant Professor, Civil Engineering Department, Quchan University of Technology, Quchan, Iran
Mohamad Reza Esfahani - Professor, Civil Engineering Department, Ferdowsi University of Mashhad, Mashhad, Iran
Kazem Moslem - Assistant Professor- Retired, Civil Engineering Department, Ferdowsi University of Mashhad, Mashhad, Iran

The research described in this paper focuses on the application of modal strain techniques on a multi-girder bridge superstructure with the objectives of identifying the presence of damage and detecting false damage diagnosis for such structures. The case study is a one-third scale model of a slab-on-girder composite bridge superstructure, comprised of a steel-free concrete deck with FRP rebars supported by four steel girders, similar to North Perimeter Red River Bridge in Winnipeg, Manitoba. The modal test data of the slab-on-girder specimen are analyzed by two mathematical methods and Mindlin approach. The Mindlin approach uses a small number of sensors and only the fundamental mode of vibration to obtain the modal strains. The unit-area normalization method produces a more precise damage patternbased on the Mindlin approach than the widely used unit-norm method and is thus a superior method for locating damage in multi-girder bridge structures. A new method is proposed to distinguish the false damage diagnosis that is common in multi-girder systems. Based on the invariant stress resultant theory and direct stiffness assumptions, a level III damage detection process is applied successfully to indicate damage localization and severity estimation of the damaged girder.

Damage, FRC deck, Invariant stress, Modal strains, spurious diagnosis