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In order to evaluate the seismic performance of existing RC buildings, pull-out tests were performed to obtain bond characteristics between low strength concrete and plain round bar under reversal loadings. From the test results of the specimen without strengthening, it was found that the maximum bond stresses were less than the allowable stress for the long term load, and that the degradations of bond stress were apparently influenced by the loading cycles. The fundamental bond-slip relationships were obtained in the tests. Additionally, the specimens repaired with epoxy resin injection showed a significant increase in bond stress. The analytical bond-slip hysteresis rule was derived from the test results. Comparisons between the observed hysteresis loops and the analytical loops were performed.

BOND CHARACTERISTICS BETWEEN LOW STRENGTH CONCRETE AND PLAIN ROUND BAR UNDER REVERSAL LOADINGS