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In order to investigate the seismic assessment procedures of existing reinforced concrete frames with poorly detailed reinforcement, five 5/9 scale reinforced concrete columns with reinforcement details typical of concrete buildings designed before 1971 were constructed and tested under high speed loading. Three columns have the shear reinforcement with 90 degree end hooks and their seismic performance were compared with those with 135 degree end hooks. The seismic behaviour of the columns with plain round bars for the reinforcement were also compared with those with deformed bars. As the results, the test units with deformed bars for the longitudinal reinforcement failed in shear after the flexural strengths were reached while those with plain round bars did not show shear faiure up to the end of testing. It was found that the 90 degree end hooks were pulled out of the longitudinal bars under the large inelastic displacement while shear reinforcement without hooks fractured. It was also demonstrated that when using the plain round bars for shear reinforcement, the 135 degree end hooks with the extension of 6 times the bar diameter were also ineffective when compared with the same anchorage configuration using deformed bars.

SEISMIC PERFORMANCE OF REINFORCED CONCRETE COLUMNS WITH 90 DEGREE END HOOKS FOR SHEAR REINFORCEMENT UNDER HIGH SPEED LOADING