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양원직(Yang Won-Jik),이원호(Yi Waon-Ho),이용재(Lee Yong-Jae) 대한건축학회 2012 大韓建築學會論文集 : 構造系 Vol.28 No.9
The foundation structure was described with the function on the distribution of bearing power according to the type of ground and on the relative stiffness of the footing slab. Consequently, bearing power, bending, and load transfer from the shear to the foundation shall be considered. Note, however, that the performance test of the foundation of an architectural structure is executed in the lab, not on the ground, as in the case of a flat-plate slab as a test that assesses the punching shear in the form of four-side support. Moreover, the design formula of the footing slab also uses the formula of the flat-plate slab. Therefore, a loading system on the ground was established to consider the effect of the bearing power on the footing slab; shear reinforcement to reduce the thickness of the footing slab was developed in this study. The shear reinforcement was fabricated such that the secondary moment of the section was maximized by bending the steel plate to "C" shape to minimize the amount of steel used. The reinforcing performance was reviewed using the width/thickness ratio of the reinforcement and the effective thickness of the footing slab as variables.
H형강의 웨브에 콘크리트를 충전한 합성보의 휨 성능 평가
양원직(Yang, Won-Jik),이원호(Yi, Waon-Ho),박진영(Park, Jin-Young),곽한식(Kwak, Han-Sik),윤현종(Yoon, Hyun-Jong),이학수(Lee, Hack-Soo) 대한건축학회 2012 大韓建築學會論文集 : 構造系 Vol.28 No.6
Due to the depression of economy, the resent construction market is in need of new process of the construction technology, which is efficient and economically sustainable development. Especially, due to the increase in steel costs, the research and development for the composite beam of steel frame buildings is actively taking place. Most types of the existing field assembly composite beams are concrete encased composite beams and they can be divided in two types: one is to produce in factories and assembled on site, such as common steel frame structure, the other is to place concrete after making a form around H-Beam. In the former case, the poured concrete increases the weight of beam and it causes a lot of time in handling on site. In the latter case, producing the form in the field results in an increase of construction time. Hence, this study shall develop the composite beam, which is able to solve the problems mentioned above. Besides it shall be verified its performance by experiment.
뉴랄-네트워크의 실시간 이력특성 동정기법에 의한 부분구조 유사동적 실험
양원직(Yang Won-Jik) 대한건축학회 2008 大韓建築學會論文集 : 構造系 Vol.24 No.3
In general, hysteresis models that are applied to a numerical analysis part of substructure on-line tests do not refer to an experimental behavior of members/subassemblage under loading tests on real-time basis. The objective of this study is to develop a new experimental technique for substructure on-line tests based on nonlinear hysteresis characteristics estimated with a neural network. New learning algorithms proposed by the authors are applied to substructure on-line tests and their results are compared with those by conventional test schemes. The results show that the new testingscheme successfully reproduce the dynamic behavior of model structure.