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김우,정제평 대한토목학회 2011 KSCE JOURNAL OF CIVIL ENGINEERING Vol.15 No.1
An enhanced truss model is presented in the present study. The model is theoretically based on the well-known relationship between shear and the rate of change of bending moment in a reinforced concrete beam subjected to combined shear and moment loads. The new model shows that a new perspective on the shear resistance can be gained by considering the variation of the internal arm length along the span. And the shear resistance mechanism is resolved into three independent base components; arch action,truss action and membrane action. The compatibility of deformation associated to the two actions is indirectly taken into account by employing an empirical factor. Then the base equation of V=dM/dx is numerically formulated so as to clarify the physical basis of the behavior related to beams under combined action of flexure and shear.
김우,정제평 대한토목학회 2011 KSCE JOURNAL OF CIVIL ENGINEERING Vol.15 No.1
This paper describes a practical formulation of Non-Bernoulli-Compatibility Truss Model that has been conceptually derived in the first part of the present study. Not only equilibrium conditions but also some approximations are employed to solve for the unknowns included in the proposed model. By assuming that the ratio of V_a to V remains to be constant along the shear span, the relationship between α and z is mathematically established as an arch shape function. V_m is also approximated to be an empirical value that is equal to the least shear strength defined by Zsutty. The α-chart is made utilizing a nonlinear finite element analysis. The adequacy of the model is examined by test results available in literatures, and the predicted values are shown to be in excellent agreement with the experimental results.
김우,김대중,모귀석,고광일,Kim, Woo,Kim, Dae-Joong,Mo, Gui-Suk,Ko, Kwang-Il 한국콘크리트학회 1994 콘크리트학회지 Vol.6 No.2
철근콘크리트보에서의 아취작용에 대한 현상을 파악하기 위해 전단지간 대 유효높이의 비 (a/b), 철근비, 전단철근의 유무등을 변수로 하여 총 16개의 시험체를 제작하여 실험하였다. 실험결과, 철근콘크리트보에서 아취현상은 최초로 보에 휨균열이 발생되면서 시작되고, 휨균열이 전단지간 중앙위치까지 발생되면 아취현상이 현저해져 보의 전체적 거동을 지배하는 것으로 나타났다. 철근콘크리트보의 전체적 거동이 아취작용에 이해 주로 지배되면, 전단지간내에서 측정된 철근인장력은 계산된 철근인장력보다 휠씬 크게 나타났다. 철근콘크리트보에서 아취현상은 지점쪽에 가까울수록, 철근비가 낮을수록 헌저하고, 전단보강을 함으로서 아취현상은 작아졌다. 철근콘크리트보에서 아취현상은 a/b가 작아질수록 증가되고, a/b가 3이하에서는 아취현상이 지배적이었다. 전단보강이 안된 a/b가 3이하의 보에서는 최종하중단계에서 타이드 아취현상이 현저하여 철근 길이\ulcorner향에 따른 철근인장력은 거의 동일한 값을 나타냈다. Sixteen reinforced concrete beams were tested statically up to failure to investigate the arch action. Major variables were the shear span to depth ratio, steel ratio and existence of stirrups.The arch action in reinforced concrete beams started when flexural cracks appeared at the center of the span. Due to the reduction of internal moment arm length by the development of arch action, the measured steel tension was significantly higher than the calculated. As the shear span to depth ratio arid steel ratio decrease, the arch action in reinforced concrete eams increases. Over the entire length the force in the steel of no web reinforced beams having smaller a /d ratio than 3 was constant because the beams acted as a tied arch.
김우 한국전산구조공학회 1988 한국전산구조공학회논문집 Vol.1 No.2
이 연구쓴 철근콘크리트R 의 전단파괴 ufl 카니즘에대한 근본적인 성질올 밝히기 위해서 전단균열의 생 성 빛 진행과정을 해석적으로 연구하였다 유한요소않에 파피역화 (fracture mechanics) 올 결합시킨 program 율 이용하여서, 첼단 콘크리트 보에서 균열이 진행함에 따라 바꿔지는 內部應力상태와 균열정점에서의 stress intensity factors 둥을 조사하여서, 전단균열의 생성 빛 진행의 끈 본석인 이유를 밝히고자 하였다. 해석 설 파로 밝혀진 사섣닫을 간단한 실힘으로 비교 검증하였다 The behavior of shear crack is investigated analytically to get a better understanding of the fundamental nature of shear failure mechamsm in reinforced concrete beams. Emphasis IS placed on the explorat ion of t he rnapr cause of the initlation and the prφagation UI an inclined shear crack in reinforced concrete 농ams without web reinforcement. By utilizing a finite element methαj incorporated into a fracture mechanics. the quantitatlve respon똥 이 reinforced concrete beams with varying amounts of cracking is examined. Progressions of the cracks are simulated‘ The analysis gives the information ()f the state of the ::;tresses at various cracking stages. The results are compared with the experimental results