This experimental study aims at investigating the bond-dependent coefficient (kb) values and verifying the dependency of the kb values on GFRP bars with different surface configurations (sand-coated and ribbed-deformed), bar diameter and concrete cover in normal-strength concrete beams. The beam specimens were 2800 mm long × 200 mm wide × 300 mm deep. All beams were tested in flexure under four-point bending configuration over a simply supported span of 2400 mm with 200 mm overhang on each side. The test results showed that not only bar surface configuration but also bar diameter and concrete cover have a significant effect on the kb value. The test results revealed that increasing the concrete cover from 38 to 50 mm caused a decrease of approximately 13 and 36% in the average kb value for sand-coated and ribbed-deformed bars, respectively. In addition, increasing the bar diameter from 16 to 19 mm while keeping the same thickness of concrete cover increased the kb values by approximately 14% for both sand-coated and deformed/ribbed bars.