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The project has two main objectives: (1) to clarify the vibrating properties of the damaged specimens and (2) to correlate the frequency with the degree of the damage in reinforced concrete tall pier models. The vibrating tests of sixteen models are carried out. The variables are the cycle of the repeated loading and the materials of the specimen, that is, normal strength concrete, high strength concrete, and steel fibered concrete. From the test results, it is obtained that the relationship between the frequency and the degree of the damage is exhibited by an exponential function and that the measured values of the damping factor range from 0.02 to 0.06 as described by other investigators. Based on the test results and the analyses, a damage function and some damage factors are found and defined. Finally, a method for the prediction of the degree of the damage is proposed.

EXPERIMENTAL STUDIES ON DAMAGE PROCESS AND VIBRATING PROPERTY OF R/C TALL PIER MODELS