EXPERIMENTAL STUDY OF FLEXURAL PERFORMANCE OF DAMAGED RC BEAMS STRENGTHENED WITH BFRP SHEETS

Eleven reinforced concrete ( RC) beams with externally bonded BFＲP sheets were experimentally investigated． The effect of BFRP layers，the concrete surface artificial chiseling and anchor type on ultimate loads， stiffness and failure mode of the beams were studied． The test results showed that the ultimate bearing capacity of the damaged RC beams strengthened with BFRP sheets from two to four layers were enhanced by 41. 26% ～ 79. 23% ，as compared with those of the control specimens，but the relationship between ultimate bearing capacity and the layer of basalt fiber sheets was not linear． When five layers were pasted，peeling failure was observed． The concrete surface artificial chiseling treatment could avoid the peeling failure，but the effect on improving the ultimate bearing capacity and reducing the deflection of the test beams was small． The reinforcing effect of a steel plate-bolt anchorage was good．