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전배호(Jeon Bae-Ho),방용식(Bang Yong-Sik),이득행(Lee Deuck-Hang),김강수(Kim Kang Su),최성모(Choi Sung-Mo),김진호(Kim Jin-Ho) 대한건축학회 2008 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.28 No.1(구조계)
This study aims at developing a new composite beam system suitable for long span and reduction of story height, for which the existing composite beams available in literature were investigated to take advantage of merits and strengthen weakness of existing system. Based on this result, this research proposed a prestressed composite beam with corrugated webs. The proposed composite beam has many merits comparing to the existing composite beams; It has great resistance against non-symmetric construction load due to its strong out-of-plane shear strength. The corrugated webs also make accordion effect, which introduce larger prestressing force, and the upward prestresing force causes camber reducing the member deflection. The form work is not required in the new system due to wide bottom flange, and the member strength also increases by the tendon provided. The effective prestressing force transferred to steel beam in the corrugated beam was estimated using a finite element analysis and compared to that in ordinary I -shaped beam. The strengths of the proposed composite beams were calculated considering composite effect based on the existing method such as shear-bond stress mode and bearing stress caused by the corrugated web. The corrugated beam had greater effective prestressing stress over 15% than the I-shaped beam, and the composite effects between concrete and steel beam were greatly improved in the proposed beam by the corrugated web. The results also indicate that the prestressed tendons can efficiently increase the flexural strength as well as stiffness of the proposed composite beam with relatively small member height, and that the new composite system has good constructability and economic efficiency by removing/minimizing form work.
판폭두께비가 큰 변단면 휨부재의 구조성능에 관한 실험적 연구
정경수,전배호,박만우,도병호,Chung, Kyung-Soo,Jeon, Bae-Ho,Park, Man-Woo,Do, Byung-Ho 한국강구조학회 2011 韓國鋼構造學會 論文集 Vol.23 No.3
저층 장스팬 철골프레임에는 강재절감을 위해 휨모멘트 저항을 극대화 한 판폭두께비가 큰 변단면 부재를 이용한 PEB시스템을 사용하고 있다. 과다한 외력에 의해 PEB시스템의 붕괴에 대한 안정성을 파악하기 위해서는 변단면 부재의 좌굴거동에 관한 실험 및 해석적 예측은 중요하다. 이에 본 연구에서는 변단면의 판폭(춤)두께비(d/t)와 변단면비를 주요 변수로 한 변단면 부재에 대한 실대형 실험을 행하였다. 현행 설계기준, 수정된 Yoda 모델을 이용한 소성힌지해석 및 유한요소해석으로 예측한 초기강성, 내력 및 모멘트-회전각관계에 대해서 실험결과와 비교하였다. The current trends in steel construction intend to use tapered sections to minimize as much as possible the use of excess material. This can be done by choosing the cross-sections to be as economical as possible, leaving the classical approach of using prismatic members. In addition, it is important to predict the buckling behavior of tapered member with large depth-to-thickness ratio in order to prevent the collapse of PEB system subjected to overloads. An experimental investigation of buckling behavior of tapered beam was presented. The primary test parameter was depth-to-thickness ratio and taper ratio. Using initial stiffness and load-carrying capacity proposed by current provision, the simple plastic hinge method using modified Yoda's model and finite element analysis, the prediction of a moment-rotation curve of linearly tapered member was presented. Moreover, comparisons between analytical and experimental data for moment-rotation curves were accomplished.
밀착조임 볼트체결에 따른 판폭두께비가 큰 변단면 프레임의 구조성능에 관한 실험적 연구
정경수,전배호,박만우,도병호,Chung, Kyung-Soo,Jeon, Bae-Ho,Park, Man-Woo,Do, Byung-Ho 한국강구조학회 2012 韓國鋼構造學會 論文集 Vol.24 No.3
저층 장스팬 철골프레임에는 강재절감을 위해 휨모멘트 저항을 극대화 한 판폭두께비가 큰 변단면 부재를 이용한 PEB시스템을 사용하고 있다. 또한, 밀착조임 볼트접합은 완전조임 볼트접합에 비하여 공사비 절감과 시공용이성의 장점을 지니고 있다. 이에 본 연구에서는 밀착조임 볼트접합으로 이루어진 엔드플레이트형 접합형식에 판폭두께비가 큰 변단면 철골프레임의 실대형 실험을 행하였다. 변수로는 볼트체결방법과 재하하중방법이다. 프레임위치별 구조적 거동에 대해서 실험결과를 분석하고, 하중-변위관계에 대해서 해석결과와 비교하였다. 또한, 현장에서 밀착조임 볼트체결에 대한 볼트축력 도입과 사용성을 평가하였다. Current trends in steel construction include using tapered, non-compact sections to minimize the use of excess material as much as possible by choosing the cross-sections instead of the classical approach of using prismatic members. In addition, snug conditions, especially the end-plate type, have the advantage of incurring less construction costs and shorter assembly times as opposed to full pre-tensioned conditions. On the other hand, it is important to predict the collapse of the PEB system due to over-loading. Large-scale tests of tapered steel portal frames with non-compact sections were conducted. The primary test parameters included the bolt connection method and the loading condition (vertical and horizontal load). The test results on initial stiffness and load capacity were investigated. Furthermore, comparisons between the analytical and experimental data for load-displacement curves were initiated. In addition, we evaluated the applicability of a snug bolt for the PEB frame in the field.
냉간성형 각형 CFT 기둥-보 내다이아프램 접합부의 인장내력식 제안
이세정(Lee Se-Jung),전배호(Jeon Bae-Ho),이광호(Lee Kwang-Ho),정진안(Jung Jin-An),최성모(Choi Sung-Mo) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1
It is difficult to fabricate closed section and inner or outside column installed diaphragm to transfer stress. After cutting column and internal diaphragm are installed, frame process works are increased and there are faults to weld hard and need opening spaces. It suggests that pipe should be produced by welding two sides together where two shapes are joined after a ㄷ-shape pipe is pre-welded onto the three sides in order to form an internal diaphragm. Thus this study intends to develop a new type of connection which has higher ability for construction than conventional methods and better mechanical performance. In this study, after we determined whether concrete is filled or not and shape of internal diaphragm. We compare with structural performance through each factor so we suggest tensile strength formulae.