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윤현도,양일승,한병찬,福山洋,전에스더,문연준 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1(구조계)
An overview of the response highly ductile hybrid fiber reinforced cementitious composites to bending loading, direct tensile loading, and cyclic loading in both tension and compression is presented. Hybrid fiber reinforced cement composites(HFHCC) contains both of specially processed steel fiber( steel cord) and synthetic fiber. such as. Polyethylene(PE) and Polyvinyl alcohol(PVA). As the result of the bending tests. HFHCC specimen shows multiple cracking in the area subjected to the greatest bending tensile stress. Uniaxial tensile test confirms the range of tensile strain capacity from 0.5 to 1.5% when hybrid fiber is used. The cyclic loading test results identified a unique unloading and reloading response for this ductile composite. Cyclic loading in tension appears not to affect the tensile response of the material if the uniaxial compressive strength during loading is not exceeded.
플루오르화에 의해 표면 개질된 폴리프로필렌 섬유의 매입인발거동
윤현도,전에스더,이영석 대한건축학회 2006 大韓建築學會論文集 : 構造系 Vol.22 No.11
High performance fiber-reinforced cementitious composites(HPFRCCs) are characterized by a stress-strain response in tension that exhibits pseudo strain-hardening behavior and multiple cracking. Such behavior is contingent on three groups of variables ; fiber(type, geometry and strength), matrix(strength, toughness, modulus) and interface related parameters such as the interfacial bond strength. In this paper, the effect of embedded length on the pullout characteristics and the effect of surface treatment with fluorination on the interfacial bond between the fiber and cementitious matrix were studied. Polypropylene fibers have a weak bond with cementitious matrix because of hydrophobicity of fibers, which does not allow for sufficient friction to develop between the two. Thus, a new method(fluorination) to improve the frictional bond by means of surface treatment of fibers was also proposed. The fluorination processing, w/b ratio of the mixtures, inclination angle and embedded length influence the pullout behavior. As a result, the fluorination process improves friction bond, maximum pullout load and end slip of polypropylene fiber.
개구부를 갖는 철근콘크리트 바벨형 전단벽의 전단강도와 변형능력
윤현도,최창식 대한건축학회 2005 大韓建築學會論文集 : 構造系 Vol.21 No.3
Shear strength and deformability of reinforced concrete(R/C) framed shear wall with opening were investigated based on available experimental date. Results of 61 tests of R/C framed shear walls with opening were reviewed to evaluate the current design provisions (Architectural Institute of Japan guideline and ACI 318-02) for nominal shear strength. The results indicate that procedures defined in chapter 21(21.7.4) of ACI 318-02 were found to overestimate the shear strength of shear walls with opening while AIJ guideline tended to underestimate that. A reasonable average lower bound to the shear strength of R/C shear walls with opening is found to be 0.34root(f_cu)MPa While deformability of shear walls with opening reduces with increasing opening periphery ratio, it increases with increasing the product of area ratio and strength of horizontal reinforcement. The magnitude of axial stress and shear stress had a insignificant effect on the deformability of shear walls with opening.
고인성 섬유보강 시멘트 복합체를 사용한 대각보강된 커플링 보의 내진성능
윤현도,김선우,전에스더,박완신 대한건축학회 2006 大韓建築學會論文集 : 構造系 Vol.22 No.4
Coupled shear walls consist of two or more in-plane walls inter-connected with coupling beams. In order to effectively resist seismic loads, coupling beams must be sufficiently stiff, strong and posses a stable load-deflection hysteretic response. Because of this, diagonally reinforced coupling beams have too complex reinforcement details and much depth to have sufficient strength and stiffness. This paper reports experimental data on the seismic performance of precast diagonally reinforced coupling beams with high performance fiber reinforced cement composite(HPFRCC). The variable in the test program was the use of concrete or HPFRCC in coupling beams. Precast diagonally reinforced coupling beams with concrete and HPFRCC(PCB-DC and PCB-DH specimen) were tested to evaluate their failure modes, shear behavior, multiple crack pattern, energy dissipation and bar strain. Based on the experimental results, PCB-DH specimen offers greater performance and energy absorbing capability than reinforced concrete coupling beam due to bridging action of fibers in concrete.
접합부/철골 커플링 보 강도비에 따른 복합 병렬 전단벽의 내진거동
윤현도,박완신 대한건축학회 2005 大韓建築學會論文集 : 構造系 Vol.21 No.1
Due to lack of information, current design methods to calculate embedment length are tacit about cases In which hybrid wall system has Joint details of stud bolts and horizontal Lies In this study, we set out to develop model for calculating the embedment lengths of embedded steel section in a hybrid wail system, and analytical and experimental studies on steel coupling beam-concrete wall connections were earned. out The cyclic response of steel coupling beams embedded into reinforced concrete boundary elements was studied Three half-scale subassemblies representing a portion of a prototype structure were designed, constructed, and tested The main test variables were the ratios of connection strength to coupling beam strength depending upon embedment length of embedded steel section The Initial stiffness of the coupling beams In all the specimens was smaller than the value computed assuming full fixity at the face of the wall The effective fixed point of steel coupling beams with auxiliary bars inside the wall is about 1/6 to 1/5 of the embedment length
윤현도,양일승,한병찬,福山洋,전에스더,문연준 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1(구조계)
In this paper, workability, fiber dispersion. compressive strength and splitting strength of hybrid fiber reinforced cement composites(HFHCC) have been investigated by means of Korean Standard (KS). Two type of HFRCC were constructed using fiber combinations of Polyethylene(PE) and steel fibers. Polyvinyl alcohol(PVA) and steel fibers. Test results showed that the fibers, when used in a hybrid form. could result in superior composite performance compared to their individual fiber reinforced cement Composites. Synthetic micro fibers. such as PE and PVA. are effective at imparting fiber dispersion and ductility to the steel fiber (five twisted steel fiber) reinforced cement Composite.
철판 보강된 섬유보강 시멘트 복합체 합성 커플링 보의 내진성능
윤현도,김선우,전에스더,박완신 대한건축학회 2006 大韓建築學會論文集 : 構造系 Vol.22 No.8
Reinforced concrete coupled shear walls in tall buildings are known as efficient structural systems to provide lateral resistance to wind and earthquake. The coupling beams connecting two shear walls are normally subjected to very high bending and shear stresses. This paper reports experimental studies to investigate the behavior and shear strength of the steel-plate reinforced concrete coupling beams under cyclic loading. In the test program, two coupling beam specimens are constructed and tested. The important variables in the test program was the use of concrete or high performance fiber-reinforced cementitious composite (HPFRCC) in coupling beams. Precast steel-plate reinforced coupling beams with concrete and HPFRCC (PCB-PC and PCB-PH specimen) were tested to evaluate their failure modes, shear behavior, multiple crack pattern, energy dissipation and bar strain. Based on the experimental results, the response of the coupling beam of specimen PCB-PH is deficient in shear, reaching a maximum shear force in the beam of 773.74kN, representing 140% of specimen PCB-PC. The relative deflection of specimen PCB-PH at ultimate was 16.6mm (Rotation angle=2.77%). Furthermore, PCB-PH represented multiple crack patterns the crack width was 0.4mm at rotation angle 2.0%, while specimen PCB-PC was 3.0mm at that. The results of these experiments demonstrate that it is possible to significantly improve the strength, stiffness, displacement capacity, energy absorption of shear deficient reinforced concrete coupling beams due to bridging of fibers in concrete.