ABSTRACT
The paper describes shaking table tests performed on a single storey small scale reinforced concrete model building retrofitted by concrete jacketing. Results from two main seismic tests performed on the model before casting the jackets and from two tests out of fifteen performed on the retrofitted one are described and discussed. The dynamic characteristics of the model before and after any seismic test were obtained from random noise exploratory tests. It is concluded that concrete jacketing of columns is an effective technique for seismic rehabilitation of concrete frame structures since: (a) it is able to reconfigure the failure mechanism from an undesirable column-sidesway mechanism to a desirable beam-sidesway mechanism, (b) it significantly enhances seismic resistance of structures, (c) it decreases the structure’s drift due to stiffening of the columns. Moreover it was found that biaxial bending of damaged reinforced concrete structures retrofitted by concrete jacketing should be expected even in an ideal case of low level one way ground motion.
