• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2003년도 봄 학술발표회 논문집
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• pp.185-192
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• 2003

This study presents the Optimum Evaluation of PS Concrete Deck and High Strength Two Plate Girder System. Recently, for the simplification of structure and the long length of bridge, a small number girder bridge which minimized a number of girder by two is much designed and constructed. For the structural analysis, a finite element formulation considering with even the matter of torsion in the three-dimensional problem is presented. And connectively, for the design of optimum section, an algorithm of optimum design is developed. The section of a small number girder bridge which constituted of two girders and PS Concrete Deck is optimized by using optimum program developed in this study. and two girders bridge refered in this study is proved a efficiency and a economy by being compared and checked to the general plate girder bridge with five girder and Reinforced Concrete Deck.

• 대한토목학회논문집
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• 제30권5A호
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• pp.407-415
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• 2010

현재 국내에서 설계되고 있는 40~70 m 지간의 강도로교 90% 이상이 박스거더교 형식이며 박스거더교는 휨 강성과 비틀림 강성이 뛰어나 장경간이나 곡선을 갖는 교량 형식으로 적합할 뿐만 아니라 가설현장에서의 작업을 최소화 할 수 있어 현장 안전관리 면에서도 유리한 구조형식이다. 그러나 박스거더는 상하 플랜지와 복부판이 수직, 수평보강재로 보강되는 구조로 부재량과 용접량이 많이 소요되어 비경제적인 교량 형식으로 많이 지적되어 왔다. 따라서, 미국이나 일본에서는 상대적으로 부부재를 줄일 수 있는 보다 경제적인 플레이트거더교가 일반적으로 적용되고 있다. 이러한 플레이트거더교의 한 형식인 소수주거더교는 강합성교량의 합리화를 위해 많이 채용되는 형식으로, 주거더 간격을 종래의 3 m 정도에서 2배 정도인 6 m 이상으로 증가하여 주거더의 개수를 최소화시키는 경제적인 교량형식이다. 또한, 거더 단면의 단순화를 위하여 거더의 복부판에 부착되는 수평보강재와 수직보강재를 최대한 생략할 수 있다. 2주거더교는 소수주거더교의 대표적인 형식으로, 유효폭 10 m 전후의 교량에 적합하여 프랑스를 중심으로 유럽에서는 1960년대부터 본격적으로 개발되어왔다. 국내에서는 소수주거더교 적용시 안전율 확보를 위해 유럽이나 일본 등에 비해 많은 강재량을 사용하고 있으며, 설계자들의 친밀도 부족과 박스거더교에 비해 복잡한 설계 등과 같은 여러가지 실무적용 차원에서 적용이 제한되고 있는 실정이다. 이 연구에서는 합리화 강교량 형식인 소수주거더교의 제작방법을 개선하고 구속콘크리트를 활용하여 강교량에서 공사비와 직결되는 강중을 줄일 수 있는 신형식 강합성거더(Turn Over Composite Girder) 구조형식을 제안하고자 한다. 또한 실물 크기인 20 m 단면회전방법을 적용한 강합성 거더시험체 및 교량시험체를 제작하여 제작성을 평가하고 구조성능 실험을 하여 구조안전성을 평가하였다.

• Structural Engineering and Mechanics
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• 제19권2호
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• pp.173-184
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• 2005

For reducing construction cost, two-plate-girder bridges are getting popular in Japan. This type of bridge employs a PC slab, which is often cast-in-place. In such a case, concrete is not usually cast over the whole slab at one time: some portions are constructed earlier than the rest. Therefore, a construction joint is inevitably created. Due to the drying shrinkage of concrete, tension stress may occur in concrete slab. High tensile stress can be expected near the construction joint where concretes with different ages meet. Moreover, prestressing is not applied over the whole length of slab at one time. This may also serve as a source of tensile stress in the slab. Thus there is a chance that cast-in-place PC slab, especially near the construction joint, may be subjected to tensile cracking. In the present study, stress states near the construction joint in the cast-in-place PC slab of a two-plate-girder bridge are investigated numerically. The finite element method is employed and the three-dimensional analysis is conducted to see the influence of dry shrinkage and prestressing. The stress states in the PC slab thus obtained are discussed. The simplified model of a plate girder for this class of analysis is also proposed.

• Structural Engineering and Mechanics
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• 제27권6호
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• pp.651-670
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• 2007

An experimental study to evaluate a redundancy capacity in simple span two plate-girder bridges, which are generally classified as a non-redundant load path structure, has been performed under the condition that one of the two girders is seriously damaged. The bottom lateral bracing was selected as an experimental parameter and two 1/5-scale bridge specimens with and without bottom lateral bracing have been prepared. The loading tests were first performed on the intact specimens without cracked girder within elastic range. Thereafter, the ultimate loading tests were conducted on the damaged specimens with an induced crack at the center of a girder. The test results showed that the cross beams and concrete deck redistributed partly the applied load to the uncracked girder, but the lateral bracing system played a significant role of the load redistribution when a girder was damaged. The redundancy was evaluated based on the test results and an appropriate redundancy level was evaluated when the lateral bracing was provided in a seriously damaged simple span two-girder steel bridge.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2005년도 춘계 학술발표회 논문집
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• pp.564-571
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• 2005

Two-plate girder bridge and narrow steel box girder bridge are suggested for the steel wheel AGT system. For these bridge system, rail-bridge interaction analysis was carried out and dynamic behavior of these bridges was investigated. The result shows that all the estimated parameters satisfy the criteria concerned. As a result these two suggested bridge systems have enough performance to be competitive for the LRT elevated structures.

• 한국강구조학회 논문집
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• 제9권3호통권32호
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• pp.309-321
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• 1997

차량이 교량을 통과할 때 교량에 발생하는 충격계수는 교량의 설계시 매우 중요한 인자이다. 본 연구에서는 2연속 강판형교의 지간 중앙점에 발생하는 충격계수에 관한 실험 및 해석적 연구를 수행하였다. 교량의 수치해석시 교량과 차량은 3차원으로 모델링하였으며. 교량의 노면조도는 Intelligent Total Station으로 직접 측정하여 사용하였다. 이때 교량의 주형은 보요소, 콘크리트 바닥판은 쉘요소를 사용하고 주형과 콘크리트 바닥판 사이는 Rigid Link를 사용하여 연결시켰다. 교량과 차량 사이의 상호작용을 고려하여 차량의 운동방정식을 유도하였으며, 차량의 여러 가지 주행속도에 따른 교량의 지간 중앙점에서의 충격계수를 구하여 우리나라 및 외국의 시방서 규정과 비교 검토하였다.

• 한국측량학회지
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• 제27권6호
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• pp.711-721
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• 2009

본 연구에서는 철도 판형교의 변형량을 측정하기 위해, 수치근접 사진측량 기법을 제안하였다. 제안방법에 의한 변형측량의 비교를 위해 기존 재하시험 방법을 동시에 수행하였다. 그 결과, 제안방법과 재하시험에 의한 측정값 차이는 1~2mm 정도였으며, 열차의 반복하중으로 인한 I형거더의 처짐과 비틀림 현상을 동시에 파악할 수 있었다. 따라서 수치사진측량으로 I형거더의 변형측정 가능성을 확인할 수 있었으며. 이 방법은 정밀안전진단과 인력점검의 대안적 방법이 될 수 있을 것이다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2005년도 추계학술대회 논문집
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• pp.240-245
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• 2005

There has been a strong demand on more economic and lower depth girder bridges for short and medium span range, PRECOM, which is a new type steel-concrete composite girder, has been developed to realize a more economic bridge system with a lower depth girder. In the PRECOM girder bridge, a steel plate girder is simply supported and then concrete form is hung to girder. Thus, the self-weight of the concrete is loaded to the steel girder. To increase the resistance of concrete in the lower casing against tensile stress, compressive force is introduced by prestressed tendon To evaluate the manufacturability and performances of the completed bridge, four 15-m girders and a bridge specimen with two 20m girders wvere constructed. The camber during the construction and introduction of an appropriate compressive force was evaluated. Dynamic data were obtained through the modal testing of the completed girders. Static loading test was also conducted to examine cracks and evaluate the decrease in stiffness and failure behavior under extreme conditions.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 춘계학술대회 논문집
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• pp.1450-1459
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• 2007

Line type rigid bearings for Open-Steel-Plate-Girder railway bridges have several problem in service, and they are unstable structurally. Thus, spherical bearings having advanced maintenance capability and device to resistance up-lift are developed and replace the existing ones. A experiment of maintenance for a new placed spherical bearings under real Open-Steel-Plate-Girder bridge is conducted and their good maintenance performance is proved. The dynamic behavior of the bridge is measured and analyzed for the two cases of the existing and replacing bearings. Therefore, the effect of the new spherical bearings on the railway bridge is assessed.

• 한국철도학회논문집
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• 제8권1호
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• pp.41-50
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• 2005

Steel -Concrete Composite two girder railway bridges applying high performance steel with extra thick plate have economic and aesthetic advantages due to the simplification of manufacturing and construction process. However, steel bridges are seldom adopted in domestic railway bridge, since steel bridges are not efficient as R.C bridges considering dynamic characteristics and noise, etc. While highway bridges do not have lower horizontal bracing and larger interval of diaphragm cross beam, railway bridges install lower horizontal bracings to control the torsion due to heavy eccentrical line load. Accurate finite element analysis were performed with the parameters of existence of bracing and bracing shape, with the cross beam interval and stiffness, etc. To find out the effects of secondary members such as horizontal bracings and diaphragms, static md dynamic analysis have been performed by using finite element method. In this study, few member plate-girder bridges are analyzed with variable span lengths to examine the dynamic behavior and limits of damping. And though lateral bracings are members against torsion, but lateral bracing's absence is no big problem. Time history analysis using mode superposition method makes proof of this result.