철판 삽입 철근콘크리트 넓은 보-기둥 접합부의 보강에 관한 실험적 연구

Abstract

Behaviors of steel reinforcement column-beam joint with specimens reinforced with steel plate insertion. Type of stiffeners was used as main parameter to structural characteristics and validity of reinforced joint. Conclusions based on the findings of this study are as follows: (1) The results of the experiment revealed that the maximum load of reinforced specimens increased by about 4 to 21%, compared with the standard specimens; JTP-SP8 increased the most by about 21%, and the JTP-SP4.5 specimen the least by around 4%. JTP-12 increased slightly, given its thickness, while JTP-SS increased by a similar level with JTP-SP8. (2) As for cracks, standard specimens suffered slight flexural cracks on top of the beam at Cycle 1 and more cracks were found from displacement ductility ratio stage 1. With cracks developing into the column over time, plastic hinge was formed at the joint. Reinforced specimens appeared to follow similar patterns with the standard specimens, but with a lower width of cracks than the standard ones. (3) As for shear deformation of the reinforced specimens, rigidity increased by up to 202% at displacement ductility ratio 1.0, compared with the standard specimens, and appeared to decline since 1.5. Shear deformation of the column was found to be lower than that of the beam, and compared with the standard specimens, shear deformation of the reinforced specimens was a bit higher. Shear deformation of the beam increased since displacement ductility ratio 1.0, lower than the standard specimens. (4) Strain of iron bars was trivial at the beginning with the help of reinforcement effects of steel plates, while appearing similar with the standard specimens since displacement ductility ratio 1.5. The comparison of deformation by specimen showed that S.G2 appeared similar until displacement ductility ratio 1, while deformation of reinforced specimens declined since 1.5. (5) Taken together, these results indicate that yield load and maximum load of reinforced specimens rose by 4% to 21%, compared with the standard specimens. JTP-SP8 generated the highest reading. Therefore, we conclude that reinforced specimens are valid as a result of structural reinforcement and that it is effective to reinforce steel plate 8T as stiffeners.