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손상입은 철근콘크리트 보의 외적 포스트텐셔닝에 의한 휨 보강
이수헌,이희두,이창수,신경재 대한건축학회 2017 대한건축학회논문집 Vol.33 No.7
An experimental work was undertaken to observe and assess the behavior of damaged reinforced concrete (RC) beams with external post-tensioning steel rods. Six simply supported beams - two control beams and four comparable beams post-tensioned using externally steel rods - were tested in three-point bending. The main parameters are the diameter of external post-tensioning rods (<TEX>${\phi}22mm$</TEX> and <TEX>${\phi}28mm$</TEX>) and the ratio of tension steel reinforcement (<TEX>${\rho}=0.0106$</TEX> and 0.0166). For the post-tensioned beams, V-shaped profiles were used with a deviator located at the bottom of mid-span, and the post-tensioning force was applied to beams in order to overcome the low load-carrying capacity and existing deflection. The post-tensioning force acting on the steel rods was applied by tightening nuts of anchorage and its value was monitored by attached strain gauges. The initial strain of about <TEX>$2000{\mu}{\varepsilon}$</TEX> was chosen for post-tensioning force because it is about the maximum strain that two adult men can apply without struggle. Test results indicate that the externally post-tensioning increased the load-carrying capacity by about 40~101% and the flexural stiffness by about 27~43% compared to control beams. On the other hand, the larger steel reinforcements and external rods of the section disturbed the yielding of external rod at ultimate strength.