| Prestressed concrete (PC) structures are advantageous in terms of durability. However, even they deteriorate as they age. In order to enhance the assessment technology for PC bridges, affiliation of authors is jointly conducting research utilizing demolished PC bridges. This paper describes the result of dynamic measurement of an existing PC T-section girder bridge which had been used for more than 40 years. In addition, numerical analysis was conducted using FE model. In the test, ambient vibration and forced vibration induced by heavy truck or weight were measured. Comparing the higher modes, frequencies of damaged span were lower than those of fair span. In the FE analysis, dynamic characteristics were calculated with damaged span model. From the result, it was found that the effect of the fixation of supports because of deteriorated bridge shoes was much larger than that of deterioration of girders in lower modes. |
