Flexural Behavior of RC Beams Strengthened with High-Tension Steel Rod
The objective of this research is to provide flexural test results applicable to the actual strengthening design of RC beams by investigating the flexural capacities of RC beams strengthened with unbonded high-strength bars. The advantages of the proposed strengthening method are the speed and simplicity of installation. Additionally,it is possible to acquire strengthened performance without skilled workers. A set of ten laboratory tests on RC beams strengthened with high-strength bars and unstrengthened RC beams as the control group were performed. The main test parameters are the diameter of high-strength bar and the ratio of tension reinforcement. The equivalent tension reinforcement ratio of the high-tension bars to the strength ratio of re-bars is also considered. The test result indicates that the maximum strain of the high-strength bars pre-tensioned with 40％ yield strain exceeds the nominal yield strain of high-strength bar. The deflection ratio of the strengthened RC beam within the serviceability limit state was less than 54％ in comparison with that of un-reinforced beam. Thus,it is possible to simplify the design equation by using the equivalent tension reinforcement ratio.
High-tension bar Prestress Post-tension Unbonded bar Reinforcing
Kyung-Jae Shin Swoo-Heon Lee
School of Architecture and Civil Engineering,Kyungpook National University,Daegu,702-701 Korea
国际会议
哈尔滨
英文
53-68
2008-10-11（万方平台首次上网日期，不代表论文的发表时间）