Prediction of Prestress Force on Grouted Tendon by Experimental Modal Analysis
The grouted tendon has been adopted to the containment building of some operating nuclear power plants in Korea and assessment of the prestress force on the grouted tendon is being issued as an important pending problem for the continuous operation beyond their design life. In order to assess the prestress force on the grouted tendon at present, indirect assessment techniques have being applied but they have limitations to accurately identify the real prestress force. Therefore, the long-term research program was begun to assess the prestress force on the grouted tendon of the containment building using nondestructive techniques. As a first step of the research program, the experimental modal analysis was carried out using 6 post-tensioned concrete beams to obtain the variation of natural frequency according to the level of prestress force. The natural frequencies of post-tensioned concrete beams were calculated using numerical analysis with measured natural frequencies and the application possibility of natural frequency to predict the prestress forces of the post-tensioned concrete beams was confirmed.
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