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이명재(Myung Jae Lee) 한국강구조학회 2009 韓國鋼構造學會 論文集 Vol.21 No.6
The composite actions of truss beams and floor slabs are not reflected on the design of the truss beam in domestic practice. In this research, basic experiments were conducted on a composite truss with the top and bottom chord members consisting of the H-shaped members. The tests were performed to evaluate the mechanical behaviors of the composite truss on the effects with the shear studs and without them. The specimens consisted of the steel truss and non-composite and composite trusses, and one-point-concentrated loading at the center and equivalent loading were monotonically applied. The composite effects were experimentally identified in the composite trusses using the shear stud connectors.
환경하중에 의한 장스팬 콘크리트 포장 슬래브의 컬링 거동 특성 분석
김성민,심재수,박희범,윤동주 한국도로학회 2009 한국도로학회논문집 Vol.11 No.3
This study was conducted to investigate the characteristics of the curling behavior of long-span pavement slabs under environmental loads. By developing and using finite element models of the long-span pavement slabs, the stress distribution and the effects of slab length, slab thickness, stiffness of underlying layers, and the restraints of the slab ends on the curling behavior were analyzed. In addition, the field experiments were performed with the actual long-span pavement slab to obtain the curling behavior of the real structure under environmental loads. As a result of this study, it was found that the vertical displacements of the long-span pavement slab along the centerline due to the curling behavior were zero except for the areas near the slab ends, and the curling stresses were maximum and constant where the displacements were zero. The slab length and the stiffness of underlying layers did not affect the maximum curling stresses. The restraints at the slab ends made the curling stresses occur near the slab ends, but did not much affect the maximum curling stresses. 본 연구는 장스팬 콘크리트 포장 슬래브가 환경하중을 받아 컬링 거동을 할 때의 특성을 분석하기 위하여 수행되었다. 먼저 장스팬 포장 슬래브의 유한요소해석 모델을 구성하여 컬링 시 응력분포 특성 및 슬래브 길이, 두께, 하부지지층 강성, 슬래브 단부 구속 등이 컬링 거동에 미치는 영향을 분석하였다. 또한 실제 시공된 장스팬 포장 슬래브를 이용하여 현장에서 환경하중에 의한 거동을 측정함으로써 컬링 거동 특성을 실험적으로도 분석하였다. 연구 결과, 장스팬 포장 슬래브는 단부에서부터 슬래브 중앙을 따라 어느 정도 안쪽으로 들어오면 컬링에 의한 수직변위가 발생하지 않으며 응력은 이곳에서부터 일정하게 최대치를 보이게 된다. 장스팬 포장 슬래브의 길이 및 하부지지층의 강성은 최대 컬링 응력에 영향을 미치지 않았으며, 슬래브 단부의 구속은 컬링 응력이 단부까지 발생하게 하지만 최대 컬링 응력의 크기에는 거의 영향을 미치지 않았다.
언더텐션 시스템이 적용된 축소 실험체의 구조적 성능에 대한 연구
김영민,박대하,이기학,이재홍,Kim, Young-Min,Park, Dae-Ha,Lee, Ki-Hak,Lee, Jae-Hong 한국강구조학회 2010 韓國鋼構造學會 論文集 Vol.22 No.4
기존의 빔과 거더로 이루어진 장스팬 구조물의 경우 기둥 사이의 거리가 길기 때문에 부재의 크기와 수직 처짐이 증가하게 된다. 효과적인 장스팬 구조물의 실현을 위하여 구조물 하부에 스트럿과 케이블로 구성된 언더텐션시스템을 적용하였다. 이는 거더의 휨모멘트를 효과적으로 분산시키기 때문에 부재의 크기를 줄이고 경제적인 효과를 기대할 수 있다. 또한 급속시공을 위한 폐단면 신형상의 모듈화 PF500단면을 사용하여 성능을 검증하고자 하였다. 언더텐션 시스템의 성능검증을 위하여 가로 10m, 세로 2.4m의 실험체 두개를 대상으로 가력실험을 실시하였고 언더텐션 시스템 유무와 케이블 장력변화에 따른 거동을 확인하였다. 실험으로부터 케이블 장력이 증가함에 따라 실험체의 거동이 작아졌으며 언더텐션 시스템이 하중분배 역할을 수행하는 것으로 나타났고 PF500단면의 성능이 우수함을 나타내었다. This paper presents an experimental investigation of the structural performance of a large-span girder bridge with an under-tension system. Typical long-span structures with beam and girder members have greater structural member depths and sizes to carry the moment and deflection. An under-tension system can be an effective structural system, as it allows the cables to resist some portions of the vertical loadings and deflections. To evaluate the serviceability and ultimate strength of the under-tension system, two $10m{\times}2.4m$ experimental under-tension systems were built and tested. One was developed with an H-beam section, and the other was made with a PF500 section that had the advantages of fast construction and lower construction cost. In the test, the maximum deflections at the mid-point of both beams were effectively reduced using under-tension systems. Also, the increased tension forces in the cable reduced the deflections. The PF500 members, which had a new shape and were developed using the module systems, performed better than the typical H-beam sections in terms of the deflections and ultimate strength.
장스팬 Virendeel Truss의 최적 설계에 관한 연구
박건태,유인정,박태준,박학길 대한건축학회지회연합회 2008 대한건축학회지회연합회 학술발표대회논문집 Vol.2008 No.1
Long-span girder system is used to that utilization of inner space. It has a good merit in the practical use. But because girder's stiffness and strength is law, a large deflection and a large mass problem follows. The purpose of this study is to improve the parameter influencing the deflection and strength, and to find the optimization of the section properties - the minimum -weighted structure. Pratt truss system weak to the shear resistance, so we used braces to increase shear stiffness. And optimization method is used to the model analysis in order to obtain the minimum-weight and the minimum deflection. The system is optimized virendeelizine to the non shear affected range.
강정호(Kang Joung-ho),하동준(Ha Dong-Joon),조광수(Cho Kwang-Soo),고지영(Koh Ji-Yeong),정찬호(Jeong Chan-Ho) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1
As Central Europe countries joined Europe Union in 2004, the investment of multi-national countries on these countries are growing and the construction of plants are increasing. For the effective construction of plants in these countries, design and construction technology should be accumulated where long span precast concrete is widely applied to reduce construction duration, labor cost and assure quality requirements. The purpose of this study is introducing and comparing design and construction technology of precast concrete in Central Europe.
밀착조임 볼트체결방법에 따른 엔드플레이트 접합부의 구조성능평가
정경수,김우식,박만우,도병호,Chung, Kyung-Soo,Kim, Woo-Sik,Park, Man-Woo,Do, Byung-Ho 한국강구조학회 2010 韓國鋼構造學會 論文集 Vol.22 No.2
저층 장스팬 철골프레임에는 강재절감을 위해 휨모멘트 저항에 극대화한 판폭 두께비가 큰 변단면 부재를 사용하고 있다. 게다가, 밀착조임 볼트접합은 고장력 볼트조임에 비하여 공사비 절감과 시공용이성의 장점을 지니고 있다. 한편, 밀착조임 엔드플레이트 접합사용에 다수 장점을 가지고 있음에도 불구하고 구조적 거동 및 해석상의 복잡함이 존재한다. 이에 본 연구에서는 밀착조임 엔드플레이트 접합형 변단면 부재에 대한 실대형 실험을 행하였다. 변수로는 체결 토크치, 재하패턴, 볼트종류, 접합부 파괴형이다. Silva et al.과 AISC(2003)에서 제시한 강성 및 내력식을 이용한 예측결과를 실험결과와 비교하였다. The current trends in steel construction involve the use of tapered sections to minimize the use of excess materials to the extent possible, by choosing cross-sections that are as economical as possible abandoning the classical approach of using prismatic members. In addition, snug-tightened connections, especially the end-plate type, have the advantage of fetching less construction costs and shorter assembly times as opposed to fully tightened joints. Although they have many merits, however, snug-tightened bolted end plates are extremely complex in their structural behavior. In this study, an experimental investigation of the snug-tightened flush end-plate connections of tapered beams were conducted. The primary test parameters were the torque for the clamping bolt, the loading pattern, the bolt type and the connection failure type. Using initial stiffness and load-carrying capacity as proposed by Silva et al. and AISC (2003), the moment-rotation curve of a linearly tapered member with a snug-tightened flush end-plate connection was predicted. Moreover, numerical and experimental data for moment-rotation curves were compared.