Abstract
In this paper, analytical studies on damage detection of RC viaduct by microtremor observation are conducted. Plastic hinge at the bottom of pier is represented as damage, following three cases are set up, the case of no damage (Case0), the case in which damages occur on one side of bridge axial direction (Case1), the case in which damages occur on one side of bridge axial rectangular direction (Case2). In each case, characteristic vibration mode is estimated by eigenvalue analysis, and dynamic analysis in which two directional microtremor waves are input to the bottom of pier is carried out. The difference of Case0~Case2 is evaluated by comparing transfer functions at representative points. As a result, it is verified that transfer function given from microtremor observation is effective to specify damage area.
