Abstract
This paper presents a methodology for damage identification based on a time domain approach, considering the coupling vibration between a bridge and a moving vehicle, including the effect of roadway surface roughness. The fundamental idea of the proposed method is to identify damage directly from changes in the element stiffness using a pseudo-static formulation derived from the equations of motion for coupling vibration. The element stiffness index (ESI), which indicates the ratio of a damaged flexural rigidity of the finite element of bridges to an undamaged one, is adopted as the indicator of bridge damage. A numerical example reveals that the concept and procedure suggested in this paper can provide a method for extending engineering choices in damage identification of bridge structures.
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