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강섬유보강 철근콘크리트 보의 휨성능에 관한 실험적 연구
하기주 ( Ha Gee-joo ),신종학 ( Shin Jong-hack ),최민권 ( Choe Min-kwon ),주정준 ( Ju Jung-jun ) 한국구조물진단유지관리공학회 1999 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.3 No.1
In this experimental program specimens, designed by the test varibles, such as percent of steel fiber incorporated, were constructed and tested to evaluate the flexural performance of reinforced steel fiber concrete beam. Based on the test results reported in this study, the following conclusions are made. Comparing with the load-displacement relationship of specimen BSS, specimen over 0.5% of steel fiber incorporated, could be improved significantly flexural performance, such as capacity, ductility, and crack pattern. Increasing the percent of steel fiber incorporated(0.5%~2.0%), the flexural strength of each specimen was showed the enhancement of 13%~40% in comparision with the standard specimen BSS.
하기주 ( Ha Gee-joo ),신종학 ( Shin Jong-hack ),주정준 ( Ju Jung-jun ) 한국구조물진단유지관리공학회 2000 한국구조물진단유지관리공학회 논문집 Vol.4 No.1
In this experimental program specimens, designed by the test variables, such as percentage of steel fiber incorporated, were constructed and tested to evaluate the flexural performance of reinforced steel fiber concrete beams. Based on the test results reported in this study, the following conclusions are made. Comparing with the load-displacement relationship of standard specimen, specimen over 0.5% of steel fiber incorporated, could be improved significantly flexural performance, such as capacity, ductility, and crack pattern. As increasing in quantity of steel fiber incorporated(0.5%~2.0%), the flexural strength of each specimen was shown the enhancement of 13%~40% in comparision with the standard specimen BSS.
철근콘크리트 전단벽의 접합방식과 대각보강에 따른 내진성능 평가 및 개선
신종학,하기주,안준석,주정준,Shin, Jong-Hack,Ha, Gee-Joo,An, Joon-Suk,Ju, Jung-Jun 한국구조물진단유지관리공학회 1999 한국구조물진단유지관리공학회 논문집 Vol.3 No.3
Six reinforced concrete shear wall, constructured with fully rigid, slit, and infilled types, were tested under both vertical and cyclic loadings. Experimental programs were carried out to evaluate the seismic performance of such test specimens, such as the hysteretic behavior, the maximum horizontal strength, crack propagation, and ductility, under load reversals. All the specimens were modeled in one-third scale size. Based on the test results, the following conclusions can be made. For the diagonal reinforced slit and infilled shear wall specimens, it was found that the failure mode shows very effective crack control and crushing due to slippage prevention of boundary region and reduction of diagonal tension rathar than the brittle shear and diagonal tension failure. The ductility of specimens designed by the diagonal reinforcement for the slit and infilled shear wall was increased 1.72~1.81 times in comparison with the fully rigid shear wall frame. Maximum horizontal load-carrying capacity of specimens designed by the diagonal reinforcement ratio the slit and infilled shear wall was increased respectively by l.14 times and l.49 times in comparison with the standard fully rigid shear wall frame.
윤용대(Yoon Yong-Dae),서수연(Seo Soo-Yeon),윤승조(Yoon Seung-Joe),하기주(Ha Gee-Ju) 대한건축학회 2009 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.29 No.1(구조계)
When doing underground excavation works for the purpose of constructing large underground structures for a building in the limited space in downtown area, the stability of the adjacent ground must be top priority, and to accomplish this, it is essential to review the retaining wall construction carefully. H-Pile, which has been mainly used as a stress-carrying material in temporary earth-retaining structures, is most likely to be abandoned after completion of the works for the basement exterior wall in relation to contiguous bored piles, so it will result in a waste of material. To improve this situation, Basement Composite Wall Method where H-Pile and basement wall are compounded, has been developed. This method is being used most frequently in many local construction sites. In this study, the researcher manufactured total four specimens in order to evaluate the shear resistance of the basement composite wall. Test was conducted taking the composition rate according to shear connectors as test parameter. And also, comparative analyses between the shear strength of both concrete and H-Pile, which are presented by standard formula at home and abroad, and test data were performed.
하기주,신종학,주정준 慶一大學校 1999 論文集 Vol.16 No.3
In this experimental program specimens, designed by the test varibles, such as with or without stirrup and percent of steel fiber incorporated, were constructed and tested to eveluate the structural performance of reinforced steel fiber concrete beam. Based on the test results reported in this study, the following conclusions are made. Comparing with the crack widths of steel fiber reinforced concrete beams during the loading of same level, the higher the percent of steel fiber incorporated, the less the crack width. When steel was reached at yielding point, the crack width of specimen BSFS2.0 and BSS was 0.07mm, 0.19mm respectively due to the crack control effect of steel fiber. Increasing the percent of steel fiber incorporated(0.5%~2.0%), the flexural strength of each specimen was showed the enhancement of 13%~40% in comparision with the standard specimen BSS. The analytic value of reinforced concrete beam of steel fiber incorporated was similiar in comparision with experimental results. experimental results of specimen BSFS0.5 and BSFS0.75, designed by the lower than 1.0% of steel fiber incorporated, was decreased 7%~8% of its thorecitical value, but experimental results of specimen BSFS1.5, BSFS2.0 was increased 5%~12% of its thorectical value.