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스트립형 탄소섬유쉬트로 전단 보강한 철근콘크리트 보의 거동에 관한 연구
황진석 진주산업대학교 산업과학기술연구소 2005 산업과학기술연구소보 Vol.- No.12
Recently the Carbon Fiber sheets is widely used for strengthening damaged RC structures. Experiments were conducted to investigate the shear behavior of RC beams strengthened with externally bonded CFS strips. Total of 12 RC beams, including 5 RC beams strengthened using CFS strips without stirrup and 5 RC beams strengthened using CFS strips with stirrup and 2 unstrengthened beam, were tested. RC beams strengthened with CFS stips showed different failure mode, failure due to strip debonding or strip rupture, and different capability to enhance shear capacity of RC beams according to the type of anchorage. Failure due to sheet debonding can be prevented by providing anchorage of additional length of sheet or mechanical anchorage. The CFS strip contribution to shear capacity of RC beams could be calculated using effective stress on CFS strip and showed good agreement between experimenal results and analytical results.
황진석,임서형 진주산업대학교 건설기술연구소 1998 건설기술연구소보 Vol.1 No.-
This paper deals with the flexural behaviors and design method of R.C beams strengthened by steel plates. The behaviors of strengthened beams which were preloaded are compared with that of a beam which was not. The structural behaviors of strengthened beams are compared with codes of strength design method. According to the results, it is shown that strengthening of damaged beams is structurally efficient and that the performance of stiffness and strength of the strengthened beams are improved. The composite action between concrete and steel plates are preserved. And it is shown that the behavior of strengthened beams follow simple laws of mechanics and can be predicted by codes on strength design method.
생산공법차이에 따른 죽력에 민괴화근을 배합한 약물이 db/db mouse의 혈당강하에 미치는 영향
황진석,장경선,김진근,최찬헌,오영준,Hwang, Jin-Seok,Jang, Kyeong-Seon,Kim, Jin-Keun,Choi, Chan-Hun,Oh, Young-Joon 대한동의생리학회 2005 동의생리병리학회지 Vol.19 No.3
This study was carried out to understand the effects of Bambusae Caulis in Liquamen manufactured by different production process and Rosa rugosa on blood sugar in the db/db mice. Bambusae Caulis in Liquamen(L-BCL, H-BCL) manufactured by low or high temperature production process and Rosa rugosa were used. The effects of L-BCL, L-BCL+Rosa rugosa, H-BCL and H-BCL+Rosa rugosa were observed in terms of blood sugar, creatinine, BUN, ALT in db/db mice. The results were as follows : The amount of glucose was significantly decreased (P<0.01) in the experimental groups compared with the control. The amount of Creatinine ovserved decrease in the case of L-BCL group. The amount of blood urea nitrogen observed significant decrease in the case of H-BCL and H-BCL+Rosa rugosa groups. The amount of ALT did not show any differences among five groups.
탄소섬유쉬트 보강 철근콘크리트보의 휨 설계법에 관한 연구
황진석,임서형 진주산업대학교 건설기술연구소 1998 건설기술연구소보 Vol.1 No.-
This paper deals with the flexural behaviors and design method of R.C beams strengthened by carbon fiber sheets. The behaviors of strengthened beams which were preloaded are compared with that of a beam which was not preloaded. The structural behaviors of strengthened beams are compared with flexural theory and current codes. According to the results, it is shown that strengthening of damaged beams is structurally efficient and that the strength of the strengthened beams are improved. The composite action between concrete and CFS are preserved after strengthening regardness of preloading. And, it is shown that the behavior of strengthened beams follow simple laws of mechanics and can be predicted by codes.
CFRP로 전단 보강한 철근콘크리트 보의 거동에 관한 연구
황진석 진주산업대학교 산업과학기술연구소 2004 산업과학기술연구소보 Vol.- No.11
Recently the Carbon Fiber Reinforced Plastics(CFRP) sheets is widely used for strengthening damaged RC structures. Experiments were conducted to investigate the shear behavior of RC beams strengthened with externally bonded CFRP sheets. 5 RC beams strengthened using CFRP sheets and 1 unstrengthened beam were tested. RC beams strengthened with CFRP sheets showed different failure mode, failure due to sheet debonding or sheet rupture. and different capability to enhance shear capacity of RC beams according to the type of anchorage. Failure due to sheet debonding can be prevented by providing anchorage of additional length of sheet or mechanical anchorage. The CFRP contribution to shear capacity of RC beams could be calculated using effective stress on CFRP sheet and showed good agreement between experimental results and analytical results.
황진석 진주산업대학교 1998 論文集 Vol.37 No.-
This paper deals with the flexural behaviors of R.C beams strengthened by steel plates. The behaviors of strengthened beams which were preloaded up to 50%, 60% and 70% of the ultimate load of unstrengthened beam are compared with that of an analytical method in terms of load-strain of concrete, load-strain of steel bar, load-strain of steel plate and falilure load. In analytical method, the principle of strain compatibility and equilibrium was used and six cases were investigated according to cracked section or partially cracked section and including strain hardening effect of steel bar and steel plate or not. Comparing the result of test and analysis, both are similar in terms of load-strain of concrete, and falilure load, the results of analytical method using perfect plasticity of steel bar slightly underestimate the failure load. And each result of load-strain of steel bar, load-strain of steel plate near at failure is similar, thus the composite action between steel plate and upper concrete is assumed to be remained up to failure of R.C beam strengthened by steel plates. Consequently, the analytical method proved to be efficient and accurate in estimating the flexural response of RC beams strengthened by steel plates.