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정재천(Jung, Jea-Chun),이창남(Lee, Chang-Nam),이승환(Lee, Seung-Hwan),김형섭(Kim, Hyoung-Seop) 대한건축학회 2014 大韓建築學會論文集 : 構造系 Vol.30 No.11
The Centrifugal Reinforced Concrete(CRC) column developed by SEN Engineering is a method utilizing PHC(Prestressed High Strength Pre-Stressed Concrete) piles as columns. The CRC column is able to obtain the maximum capacity as for a reinforced concrete column due to its manufacturing method using centrifugal force to produce high strength concrete same for PHC and inserting a reinforced cage instead of a pre-stressed wire decreasing compressive strength in PHC. This expeditious and economical way to produce concrete of strength more than 80MPa by centrifugal casting makes CRC columns be easily and quickly applied to the construction site than PC(Precast Concrete). CRC column is not only improve applicability but it also enhances constructability because its buckling capacity higher than H-section column leads to increase the depth of penetration. If a required service load is higher than the capacity of the CRC column, it can be reinforced by additional concrete casting with re-bars in the site to obtain sufficient strength. The seismic resistance performance of the CRC column-to-TSC beam connection is previously demonstrated in accordance with KBC 2009 by experimental test, and the real scale test of the connection is conducted in this study. As a result, the seismic resistance performance of the connection meets the requirements of KBC2009; therefore, the CRC column-to-TSC beam connection can be used as IMF or SMF.
인장을 가하지 않은 강연선 및 프리텐션 강연선 PC보의 휨성능 평가
노삼영 ( Noh Sam-young ),정재천 ( Jung Jea-chun ),김형근 ( Kim Hyoung-geun ),조민주 ( Jo Min-ju ) 한국구조물진단유지관리공학회 2010 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.14 No.1
In this study, Flexural behavior of PC Beams parts of tension reinforcied bar transfer within untensioned prestressing strand and prestressing strand. Test parameters in this experimental study were D25 reinforcied bar and Ф 15.2 strand tension use modifications of tension member, and 5 specimens produced. On this tests, all specimens flexural capacites is sufficient. prestress PC beams are good at flexural stiffness and Deflection behavior. Because tension stiffening sffect is relatively high efect on prestress PC beams.
조민주 ( Jo Min-ju ),노삼영 ( Noh Sam-young ),김형근 ( Kim Hyoung-geun ),정재천 ( Jung Jea-chun ) 한국구조물진단유지관리공학회 2009 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.13 No.2
In this study, Flexural behavior of PC Beams parts of tension reinforcied bar transfer within untensioned prestressing strand. Test parameters in this experimental study were D25 reinforcied bar and Φ12.7 strand tension use modifications of tension member, and 5 specimens produced. On this tests, all specimens flexural capacites is sufficient, but untensioned strand-reinforcied bar ratio of tension member, increase where deflection will increase, ductillity also falls. If untensioned strand-reinforcied bar ratio of tension member is high, deflection and ductillity must consider the fact that will fall, and don't used only untensioned strand of tension member.
인장을 가하지 않은 강연선을 사용한 PC 접합부의 반복하중에 의한 구조적 특징
노삼영 ( Noh Sam-young ),조민주 ( Jo Min-ju ),김형근 ( Kim Hyoung-geun ),정재천 ( Jung Jea-chun ) 한국구조물진단유지관리공학회 2010 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.14 No.1
In this study, we supplement defects of existing PC construction methods in joining section. And we suggest new joining section details securing ability of execution and monolithic ability column-beam. To confirm monolithic ability in joining section in case of using strands in column-beam joining section of 6m column, we made 3 laboratory samples which have variables, the number of tension reinforcing rods and strands. Then we assessed some abilities, flexibility ability and structural ability, ductility ability under the repeated load.
비인장 강연선을 사용한 접합부 일체형 PC 보-기둥 시스템의 휨성능 평가
노삼영(Noh Sam-Young),조민주(Jo Min-Joo),김형근(Kim Hyung-Geun),정재천(Jung Jea-Chun) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.1
In this study, a new moment-resisting precast concrete beam and column joint system was developed mainly for the use in underground parking lot in multi-residential building. It has attempted to devise connection details of the joint which will improve workability and provide effective stress transfer mechanism in the region of connection. The characteristics of the joint system is that the upper main reinforcements pass through the flanks of the column and the two pairs of the untensioned wire strands penetrate through the pre-scribed holes located at the upper and lower centers of the PC column. For the evaluation of the performance of this new joint system, two types of the specimens were tested. The first one is to investigate the behavior of beams reinforced by deformed bars and untensioned strands in combination. The reinforcement ratio of the wire strand to the deformend bar was selected as the test parameter. The test results showed that the flexural capacities of all five specimens were sufficient. However when the untensioned strand reinforcement ratio is exceed 43%, the deflection increased considerably. Secondly the behavior of this joint system under the negative bending moment was investigated. Two specimens differentiated by the type of the penetrating reinforcement (deformed bars or wire strands) were tested. The results showed that the both specimens have sufficient flexural capacities and the deflection and ductility was similar to each other. The study concluded that the new PC beam-column joint system has the structural performance satisfying the requirements, only when the reinforcement ratio of the wire strand is limited.
조민주(Jo, Min-Ju),노삼영(Noh, Sam-Young),김형근(Kim, HYoung-Geun),정재천(Jung, Jea-Chun) 한국구조물진단유지관리학회 2009 한국구조물진단학회 학술발표회논문집 Vol.2009 No.2
In this study, Flexural behavior of PC Beams parts of tension reinforcied bar transfer within untensioned prestressing strand. Test parameters in this experimental study were D25 reinforcied bar and φ12.7 strand tension use modifications of tension member, and 5 specimens produced. On this tests, all specimens flexural capacites is sufficient, but untensioned strand-reinforcied bar ratio of tension member, increase where deflection will increase, ductillity also falls. If untensioned strand-reinforcied bar ratio of tension member is high, deflection and ductillity must consider the fact that will fall, and don't used only untensioned strand of tension member.
모멘트-처짐 관계에 기반한 철근콘크리트 보의 유효단면 2차 모멘트 산정식
노삼영(Noh, Sam-Young),김유리(Kim, Yu-Ri),정재천(Jung, Jea-Chun) 대한건축학회 2012 大韓建築學會論文集 : 構造系 Vol.28 No.10
KCI and ACI design code adopted the equation of Branson for simple calculation of deflection, in which a representative value of the effective moment of inertia is used for the whole length of a member. However, the inadequacy of the formulation of the equation had been being pointed out through many researches till now. This study formulated a new equation of the effective inertia moment for deflection, which was formulated through a clear and simple approach using experimental data. The moment-deflection curves of a simple beam was modeled using by a bilinear curve. The straight line after formation of cracks was determined by the consideration of tension stiffening effect, which is multiplied by the moment of inertia for a cracked section. This coefficient was approximated by a regression curve estimated using experimental results of 18 specimens, in which the tensile strength and reinforcement ratio were selected as a parameter. From the bilinear model the effective inertia moment can be estimated for any level of moment. The deflections estimated using the equation from the study showed the better approximation that from ACI, and comes close to CEB-FIP MODEL CODE 1990, EUROCODE 2. The study also demonstrated statistically that the suggested equation indicated more similar experimental results rather than the domestic standard equation.
노삼영(Noh, Sam-Young),조민주(Jo, Min-Joo),정재천(Jung, Jea-Chun),홍성진(Hong, Seong-Jin) 대한건축학회 2012 大韓建築學會論文集 : 構造系 Vol.28 No.1
A new moment-resisting precast concrete beam and column joint(PC beam-column joint) system using untensioned strand was developed in this study, mainly for the use in underground parking lot in which the influences of the seismic load may be neglected. For the evaluation of the structural performance of this new system, two types of the specimens were tested. The first one is to investigate the behavior of the beams reinforced by the deformed bars and the wire strands in combination. As a test parameter, it was selected whether the wire strand is tensioned or not. The test results showed that the flexural capacities of all specimens were sufficient and the decrease of deflection owing to the prestressing is not large. Secondly, the structural performance of this joint system under the cyclic loading was investigated. Two specimens differentiated by the type of the penetrating reinforcement through the PC column (deformed bar or wire strands) were tested. The results showed that this joint system has satisfactory strength and stiffness and ductility. The study concluded that the new precast concrete beam and column joint system has the structural performance satisfying the requirements.