REPAIRED RC FLAT-SLAB-COLUMN SUBASSEMBLAGES UNDER LATERAL LOADING

Results of laboratory tests on four repaired reinforced-concrete flat- slab interior column connections, carrying quasi-static, reversed, hor izontal loadings are presented. The specimens, which originally had to tally failed, were repaired and subjected to gradually increasing reve rsed loading histories, similar to those imposed on the original speci mens. A comparative analysis was made before the repair. The specimens were repaired by using externally screwed steel plates replacing the lost or damaged full reinforcement of the slab, In addition, high-pres sure epoxy injection provided the bond between the concrete and the ne w reinforcement. Moreover, this repair method can be easily used to re store, strengthen, or upgrade existing and old flat-slab buildings, no t suitably designed to withstand earthquakes, The practical aspects of the repair technique developed for postearthquake mass production wer e emphasized, with satisfactory results even when not applied by resea rch laboratory experts.