• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2001년도 가을 학술발표회 논문집
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• pp.757-762
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• 2001

This study was performed experiment for strengthened bridge decks with isotropic carbon fiber sheets received fatigue loading, and compared with fatigue behavior of unstrengthened bridge decks. By the results, this study was examined effect of increasing strengthened to phase life cycles of bridge deck for fatigue loading and application of the punching shear theory of bridge deck strengthened by carbon fiber sheet.

• 한국철도학회:학술대회논문집
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• 한국철도학회 1999년도 춘계학술대회 논문집
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• pp.450-457
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• 1999

In this study, the simplified method for 3-dimensional vehicle-bridge interaction analysis is utilized in the analysis of dynamic behavior of bridges in which the eccentricity of axle loads and the effect of the torsional forces acting on the bridge are included for the more accurate vehicle-bridge interaction analysis. Investigations mainly into the influence of vehicle speed on vehicle-bridge interactions are carried out for case that two trains move respectively on their tracks in the opposite direction.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2006년도 정기 학술대회 논문집
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• pp.581-588
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• 2006

Now, a long span and special types of steel deck bridges like as suspention or cable state bridges are increasing and Guss Asphalt used in pavement. But Guss Asphalt may caused severe stress and displacement of the bridge as it is treated using very high temperature ranging from $220^{\circ}C\;to\;260^{\circ}C$. In this paper, a series of numerical tests of a steel deck box arch bridge were conducted to estimate the thermal effect of a steel deck bridge according to temperature changes.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 춘계학술대회 논문집
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• pp.1074-1079
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• 2007

It is important to evaluate the effect in the maintenance of steel bridge because the fatigue of the bridge is affected by the structural characteristic of bridge such as structure type, span and steel grade, etc. In this study, we analyzed the effect of fatigue strength by the changes of span of the bridge and the steel grade in many factors which have influence on the fatigue life of the bridge. For this analysis, we selected the objective bridges and performed the structural analyses for the various parameters such as span and steel grade. The fatigue evaluations were carried out by FAST which is a program for fatigue estimation and the results were compared.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2002년도 춘계학술대회논문집
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• pp.929-934
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• 2002

There are many reasons for occurring vibration when trains run on the railway, but the typical vibration are occurring when the trains run on the elevated Railway bridge. For the settlement of the problems form the vibration, it must be performed to analyze the effect of the vibration to human bodies and adjacent area. and to establish the countermeasures. In this paper, we analyzed the effects of the vibration to the bridge itself and to adjacent structures by measuring the vibration of Yong-Dang Elevated Railway Bridge on Jeolla Line and adjacent area.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2005년도 봄학술 발표회 논문집(I)
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• pp.355-358
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• 2005

In this paper, an actual behavior of the pylon of Seohae Grand Bridge which is a cable stayed bridge and has been constructed 4 years ago was analyzed by using data acquisition system. As a result, the pylon of cable stayed bridge behaved normally with respect to the change of temperature. The annual displacement of the top of pylon(PY1) ranged from -71.4mm to +181.7mm in the longitudinal direction of the bridge. In the case of the longitudinal displacement, the displacement of PY1 was bigger than that of PY2 because PY1 is movable and PY2 is fixed in terms of the constraint condition of super structure. For the long term, PY1 will be sloped gently to the direction of Dangjin and PY2 will be also sloped gently to the direction of Pyongtaek by the effect of creep and shrinkage in the case of the longitudinal direction. The result of structural analysis showed good agreement with the result mentioned above.

• Wind and Structures
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• 제4권4호
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• pp.315-332
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• 2001

Presented herein is a numerical study for evaluating the aerodynamic behaviour of equipped bridge deck sections. In the first part, the method adopted is described, in particular concerning turbulence models, meshing requirements and numerical approach. The validation of the procedure represents the aim of the second part of the paper: the results of the numerical simulation in case of two-dimensional, steady, incompressible, turbulent flow around a realistic bridge deck are compared to the data collected from wind-tunnel tests. In order to demonstrate the influence of the section details and of the partial streamlining of the deck geometry on its aerodynamic behaviour, in the third part of the paper the effect of the fairings and of each item of equipment of the section (such as central barriers, side railings and sidewalks) is evaluated. The study has been applied to the deck section of the Normandy cable-stayed bridge.

• 한국방재학회:학술대회논문집
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• 한국방재학회 2008년도 정기총회 및 학술발표대회
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• pp.63-66
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• 2008

The bridge deck section composed of a concrete slab resting on two I-beam girders are known to be susceptible to flutter instability and vortex shedding. Moreover, the cable stayed bridge in construction is more vulnerable to wind rather than in service when the free cantilever construction method is applied. This paper describes the effect of the dynamic wind loads on the bridge during construction and the effect of alternative temporary stabilizing measures. Therefore, a series of wind tunnel tests and numerical analysis were carried out to determine if any countermeasures were required.

• Computers and Concrete
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• 제14권6호
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• pp.745-765
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• 2014

In this paper, it is aimed to determine the finite element model updating effects on the structural behavior of long span concrete highway bridges. Birecik Highway Bridge located on the 81stkm of Sanliurfa-Gaziantep state highway over Firat River in Turkey is selected as a case study. The bridge consist of fourteen spans, each of span has a nearly 26m. The total bridge length is 380m and width of bridge is 10m. Firstly, the analytical dynamic characteristics such as natural frequencies and mode shapes are attained from finite element analyses using SAP2000 program. After, experimental dynamic characteristics are specified from field investigations using Operational Modal Analysis method. Enhanced Frequency Domain Decomposition method in the frequency domain is used to extract the dynamic characteristics such as natural frequencies, mode shapes and damping ratios. Analytically and experimentally identified dynamic characteristics are compared with each other and finite element model of the bridge is updated to reduce the differences by changing of some uncertain parameters such as section properties, damages, boundary conditions and material properties. At the end of the study, structural performance of the highway bridge is determined under dead load, live load, and dynamic loads before and after model updating to specify the updating effect. Displacements, internal forces and stresses are used as comparison parameters. From the study, it is seen that the ambient vibration measurements are enough to identify the most significant modes of long span highway bridges. Maximum differences between the natural frequencies are reduced averagely from %46.7 to %2.39 by model updating. A good harmony is found between mode shapes after finite element model updating. It is demonstrated that finite element model updating has an important effect on the structural performance of the arch type long span highway bridge. Maximum displacements, shear forces, bending moments and compressive stresses are reduced %28.6, %21.0, %19.22, and %33.3-20.0, respectively.

• 한국강구조학회 논문집
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• 제27권4호
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• pp.371-376
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• 2015

현수교 주케이블 가설을 위한 임시 구조물인 캣워크의 비틀림 거동에 대해 연구를 수행하였다. 캣워크의 비틀림 변형은 작업원의 안전성과 작업성에 중요한 영향을 미친다. 이러한 이유로 설계단계에서는 크로스 브릿지의 간격을 조정하여 캣워크의 비틀림 변형이 일정 수준이하가 되도록 고려하고 있다. 이 연구에서는 캣워크의 비틀림 안전성과 관련된 크로스 브릿지의 설치 간격에 따른 영향을 분석하였다. 해석적 접근을 위해 크로스 브릿지를 포함한 상세 부분해석 모델을 작성하였다. 작성된 해석모델을 이용하여 크로스 브릿지 설치 간격에 따른 영향을 Prefabricated Parallel Wire Strand의 편심하중과 가설이 가능한 풍속 영역에서의 풍하중에 대해 검토를 수행하였다. 검토 결과 크로스 브릿지의 설치 간격이 캣워크의 비틀림 거동에 큰 영향을 줌을 확인하였으며, 검토 대상 교량의 캣워크는 비틀림 변형에 대해 안전성을 확보하고 있는 것으로 확인되었다.