A STUDY OF DAMAGE OF REINFORCED CONCRETE COLUMN WIDENED THE SPACE OF LATERAL REINFORCEMENT AT BASE OF THE COLUMN IN THE EARTHQUAKE

Abstract

 It is necessary to cut out the remove of obstructions around reinforced concrete column in the seismic retrofitting construction of existing reinforced concrete columns. Therefore, to widen the space of lateral reinforcement materials is required. However, since the seismic capacity of retrofitted column suddenly deteriorates, it is not able to widen the space of lateral reinforcement materials.
 So the specimens of reinforced concrete column widened the space of lateral reinforcement materials at base of the column were tested under reverse cyclic loading. Test results showed that the failure mode did not become shear failure mode in this experiment. In addition, the arrangement method of lateral reinforcement material, which dose not decrease the seismic capacity, was showed.