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강섬유 혼입 폴리머 시멘트 고강도 콘크리트 보의 전단거동
곽계환 ( Kwak Kae Hwan ),박종건 ( Park Jong Gun ),곽경헌 ( Kwak Kyung Hern ) 한국농공학회 2002 韓國農工學會誌 : 전원과 자원 Vol.44 No.1
Steel fiber and polymer are used widely for reinforcement material of RC structures because of its excellences of the durability, serviceability as well as mechanical properties. The purpose of this study is to investigate the shear behavior of polymer cement high strength concrete beams mixed with steel fiber. The compressive strength of concrete was based on the 100×200 mm cylinder specimens. The compressive strength of concrete are 320 kgf/㎠, 436 kgf/㎠ and 520 kgf/㎠ in the 28 days. The static test was carried out to measure the ultimate load, the initial load of flexural and diagonal cracking, crack patterns and fracture modes. Also, load-strain and load-deflection examined. During the test cracks were sketched against the load values according to the growth of crack. Result are as follows; (1) The failure modes of the specimens are increased in rigidity and durability with mixing steel fiber and polymer. (2) The load of initial crack was similar a theory of shear-crack strength. (3) The deflection and strain at failure load of Polymer-steel fiber high strength concrete beams were increased, improving the brittleness of the high strength concrete.
곽계환 ( Kwak Kae Hwan ),고갑수 ( Go Gab Su ),곽경헌 ( Kwak Kyung Hern ) 한국농공학회 1996 韓國農工學會誌 : 전원과 자원 Vol.38 No.3
In recent years, the research and development about the new material proceeds rapidly and actively. In building industry, high strength concrete is of interest as a new material. Since the building structure becomes bigger, higher and more specialized, the demand of material and member with high strength expands greatly. Therefore in this experiment, cement complex with high strength was made using the condensed silica fume, a basic experiment was performed on strength property, and optimum-mixture-state was determined for manufacturing a high-strength concrete. Shear behaviour and fracture property of concrete beams with high strength were evaluated. On the whole, in spite of many researches, it is one of the difficult problems that shear fracture of concrete beams has not yet been clearly understood theoretically, and now the shear-design-standard forms in many countries are a formula based on experiment. In this study, the variable of shear behavior experiment was shear-reinforcement-ratio. By analyzing test results and comparing with computation value by ACI code, the basic data was offered on shear design of reinforced concrete beams with high strength. The effect of epoxy repair was also investigated for the beams with cracks due to flexural and shear loading.
FRP-콘크리트 합성 압축재의 거동평가 및 예측에 관한 실험적 연구
박주경(Park, Ju-Kyung),곽경헌(Kwak, Kyung Hern),정태영(Chung, Tae-Young),김진수(Kim, Jin Soo) 한국구조물진단유지관리학회 2009 한국구조물진단학회 학술발표회논문집 Vol.2009 No.2
In this thesis it is attempted to predict the compressive strength and the stress-strain relation of CFFT by using uniaxial compression tests. Before the test, physical, chemical, and mechanical properties of FRP are measured or determined by experiment and the existing documents relating to the study of CFFT has been collected and reviewed. From the research, prediction model for the strength and stress-strain relation of CFFT compression member is suggested. So, it is expected that the results could be used for the preliminary design of such structures or as a basic data for the future research.
박주경 ( Park Ju-kyung ),권오훈 ( Kwon Oh-hun ),곽경헌 ( Kwak Kyung Hern ),최양진 ( Choi Yang-jin ),정태영 ( Chung Tae-young ) 한국구조물진단유지관리공학회 2007 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.11 No.1
This study took a look at the tendency of studies by collecting and analyzing the data of the advanced studies on SFRC, and facilitated it on the learning data required in the model development. In addition, by applying the diverse nerve network model and various algorithms to develop the optimal nerve network model appropriate to the dynamic characteristics. The accuracy of the developed nerve network model was compared with the experiment data value of other researchers not utilized as the learning data, the experiment data value undertaken in this study, and comparison made with the formulas proposed by the researchers. And, by analyzing the influence of learning data of nerve network model on the estimation result, the sensitivity of the forecasting system on the learning data of the nerve network is analyzed.
FRP-콘크리트 합성 압축재의 거동평가에 관한 실험적 연구
박주경(Park, Ju-Kyung),곽경헌(Kwak, Kyung Hern),정태영(Chung, Tae-Young),김진수(Kim, Jin Soo) 한국구조물진단유지관리학회 2009 한국구조물진단학회 학술발표회논문집 Vol.2009 No.1
In recent years, experimental study on the CFFT to predict the structural behavior has been conducted by numerous researchers and they suggested the prediction model. But their prediction models are significantly differ each other. So, experimental verification of the prediction model is still needed. From the research, prediction model for the strength and stress-strain relation of CFFT compression member is suggested. So, it is expected that the results could be used for the preliminary design of such structures or as a basic data for the future research.
FRP-콘크리트 합성 압축재의 거동평가 및 예측에 관한 실험적 연구
박주경 ( Park Ju-kyung ),곽경헌 ( Kwak Kyung Hern ),정태영 ( Chung Tae-young ),김진수 ( Kim Jin Soo ) 한국구조물진단유지관리공학회 2009 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.13 No.2
In this thesis it is attempted to predict the compressive strength and the stress-strain relation of CFFT by using uniaxial compression tests. Before the test, physical, chemical, and mechanical properties of FRP are measured or determined by experiment and the existing documents relating to the study of CFFT has been collected and reviewed. From the research, prediction model for the strength and stress-strain relation of CFFT compression member is suggested. So, it is expected that the results could be used for the preliminary design of such structures or as a basic data for the future research.