Abstract
Important structural properties related to strength and deformations of corner beam-
 column joints damaged and strengthened were studied in this investigation. For this
 
 purpose a total of 18 corner beam-column joints divided into five groups were cast and
 tested. The cross sections were 150mm X 200mm and 150mm X 250mm for the beam
 and column, respectively. The legs of each beam and column were 900mm. Group1
 specimens were consisted of two control specimens tested to failure. Other groups
 specimens each consisted of four specimens, two of which were tested up to first crack
 loading and the other two were tested up to 80% of the expected ultimate load. After
 preloading, the damaged specimens were strengthened in such a way that Group2 were
 strengthened with strip of CFRP, Group3 with steel plate strip, Group4 with ferrocement,
 and Group5 with full CFRP sheets. After strengthening process, the strengthened
 specimens were retested to failure. The test results indicated that the process of the
 rehabilitations is successful. After strengthening, the ultimate load was increased by
 38.3, 4.25, 6.3, and 42.5 % for Group2, 3, 4, and 5, respectively. The stiffness of the
 strengthened specimens increased compared to the control specimens. The better
 strengthening technique was those specimens strengthened with full CFRP sheets. The
 
 effect of cracking due to preloading on the flexural behavior of strengthened beam-
 column joint was found to be insignificant.
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