• Title/Summary/Keyword: Plate girder

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Reinforcement Location of Plate Girders with Longitudinal Stiffeners (플레이트 거더의 수평보강재 보강 위치)

  • Son, Byung-Jik;Huh, Yong-Hak
    • Journal of the Korean Society of Safety
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    • v.24 no.4
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    • pp.82-89
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    • 2009
  • Unlike concrete bridge, steel bridge resists external force by forming thin plate. Thus, because steel girder bridge has big slenderness ratio, buckling is a major design factor. Plate girder consists of flange and web plate. Because of economic views, web plate that resists shear forces is made by more thinner plate. Thus, web plate has much risk for buckling. The objective of this study is to analyze the buckling behaviors of plate girder and to present the proper reinforcement location of longitudinal stiffeners. Various parametric study according to the change of web height, transverse stiffeners and load condition are examined.

A Study on Integrated Cross Beam Improvement of Through Railway Plate Girder Bridge Support (철도 하로판형교 지점부의 일체형 가로보 개선에 관한 연구)

  • Ha, Yun-Soo;Kim, Doo-Hwan;Song, Kwan-Kwon;Kim, Seong-Pil;Lee, Seong-Geun
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.22 no.4
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    • pp.114-120
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    • 2018
  • Recently, the plate girder bridge is offen designed a temporary bridge for underground roadway construction have not interrupt railroad operation. The integral support plate girder bridge which have longitudinal girder and cross-girder is improved workability and reduction cost and of construction time. The cross beam of the integral support plate girder bridge has a normal box shape to distribute load on the main girde to end both side girder. In this study, On the change to the web distance of the cross box shows characteristics of related to the stresses and displacements on the flange and web plate. Afterward, the various analysis contributed to the safety improvement of crossbeam of the integral support crossbeam plate girder bridge.

An Analytical Review of the Dynamic Interactions between Tilting Train and Welded Plate Girder Bridges (틸팅차량과 용접형 판형교의 동적 상호작용에 관한 해석적 고찰)

  • Lee Hee Up;Um Ju Hwan;Ku Su Hwan;Go Dong Choon
    • Proceedings of the KSR Conference
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    • 2003.10b
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    • pp.596-601
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    • 2003
  • After the development of practical technology for tilting system, tilting trains are operated on conventional lines of KORAIL. As the running speed of trains is increased, it is very important to investigate the dynamic characteristics of plate girder bridges with direct track fixation. Therefore, this paper reviews the dynamic interactions between tilting train and welded plate girder bridges designed by L-22, a standard load type of KORAIL. The span lengths of plate girder analyzed here are 6.6m, 9.7m, 12.9m, 16.0m, 19.2m, 22.3m, 25.4m and 31.1m. Using 2-D dynamic analysis, the critical velocity of tilting train, vertical deflection ratios of plate girder and maximum accelerations of car body are calculated. And the analytical results are compared with those of design criteria.

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Damage Detection in Cracked Model Plate-Girder using Damage Index Method and System Identification Technique (손상지수법과 구조식별(SID) 기법을 통한 균열된 강판형 모형의 손상검색)

  • 백종훈;류연선;김정태;조현만
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2001.10a
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    • pp.109-116
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    • 2001
  • An integrated damage identification system (IDIS) and system identification (SID) technique using modal information to detect damage in structures is presented. The objective is to detect damages in cracked model plate-girder without baseline modal parameters. The theory of damage localization and system identification is outlined. Experiments on a model plate-girder was described and a baseline model representing the experimental modal characteristics of the model plate-girder is updated using the system identification technique. Finally, damage inflicted in the model plate-girder is predicted using the IDIS software.

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Performance Improvement on Plate Girder Bridges Through Continuous Welded Rail (판형교 장대화에 따른 성능 개선)

  • Min, Kyung-Joo;Bahn, Gul-Yong;Ryu, Yeon-Jong
    • Proceedings of the KSR Conference
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    • 2007.05a
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    • pp.1439-1449
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    • 2007
  • The challenging aspect of CWR (continuous welded rail) is the additional axial forces in rails, mainly due to the thermal expansion of steel plate girder and rail itself. It has been found that these axial forces are proportional to girder length, total bridge length and bolt tightening forces. Also these forces are dependent to girder support conditions, types of bearings and their arrangements. With CWR, the authors' previous studies show that performance improvements like noise reduce, fatigue resistances and bearing durability increment can be expected. In addition to these effects, secondary effects due to the semi integral behavior between rail and bridge girder also can be expected. Special bearings which can reduce the absolute maximum axial forces have been developed, and applied to real 100m span bridge. The performance improvements were verified through site measurements and numerical analysis. The purpose of this study is to confirm the expected performance improvement aspects of steel plate girder bridges with CWR. To verify these aspects, girder stiffness changes, rail axial force changes, girder displacements and noise level were thoroughly measured and compared.

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Measurement and Analysis about Behavior of Steel Plate Girder in Vicinity of Support, According to Driving Condition (주행조건에 따른 판형교 지점부 거동 측정 분석)

  • Lee, Syeung-Youl;Kim, Nam-Hong;Woo, Byoung-Koo;Na, Kang-Woon
    • Proceedings of the KSR Conference
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    • 2011.05a
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    • pp.690-696
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    • 2011
  • A number of conventional railway bridge is more than 2600. Non-ballast plate girder bridge is about 700 and this is 27% of all bridge numbers. Non-ballast plate girder has advantages that self load is more lighter than moving load and construction cost is more inexpensive than concrete bridge. But non-ballast plate girder has disadvantages that vibration and noise is bigger than concrete bridge. This study had analyzed behavior of non-ballast plate girder according to the arrangement of supports and driving conditions to review the proper arrangement of support. Measurements were performed in single line and disel locomotive of 7400type were used as test vehicle. The vehicle's driving conditions are as follows; Change of driving direction, Constant speed driving, Deceleration driving, Acceleration driving. Main measurement contents were horizontal displacement and vertical vibration acceleration in girder of vicinity support. Results of measurement are as follows; In case that a vehicle drives from fixed support to movable support, vertical vibration acceleration of the girder was smaller than opposition case.

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An Effect of the Behavior of Steel Plate Girder bridge with Applying External Post-Tensioning Method (외부후긴장 보강공법이 판형교의 거동에 미치는 영향)

  • Min, Rak-Ki;Sung, Deok-Yong;Kim, Eun-Kyun;Lee, Hee-Up;Park, Yong-Gul
    • Proceedings of the KSR Conference
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    • 2006.11b
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    • pp.514-521
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    • 2006
  • In strengthening structure, the external post-tensioning method which secure clearness in the structure analysis process is adopted to bridge as well as architecture structure. Therefore, the major objective of this study is to investigate the effects and application of external post-tensioning method for steel plate girder bridge. It analyzed the mechanical behaviors of steel plate girder bridge with applying external post-tensioning on the finite element analysis and laboratory test for the dynamic characteristics. As a result, the reinforcement of steel plate girder bridge the external post-tensioning method are obviously effective for the response which is non-reinforced. The analytical and experimental study are carried out to investigate the post-tension force decrease stress and deflection on steel plate girder bridge for serviceability. It is investigated that the change degree of natural frequency is very low with applying the external post-tensioning method. The servicing steel plate girder bridge with external post-tensioning is the reasonable reinforcement measures which could be secured the stability of dynamic behavior and increase a dropped durability.

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Optimum Evaluation of PS Concrete Deck and High Strength Two Plate Girder System (PS 콘크리트 바닥판 및 고강도 2주형 거더 시스템의 최적설계평가)

  • 박태훈;박문호;조창근;권민호;남유석
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2003.04a
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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.

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Development and Experimental Performance Evaluation of Steel Composite Girder by Turn Over Process (단면회전방법을 적용한 강합성 소수주거더 개발 및 실험적 성능 평가)

  • Kim, Sung Jae;Yi, Na Hyun;Kim, Sung Bae;Kim, Jang-Ho Jay
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.30 no.5A
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    • pp.407-415
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    • 2010
  • In Korea, more than 90% of the total number of steel bridges built for 40~70 m span length is a steel box-girder bridge type. A steel box-girder bridge is suitable for long span or curved bridges with outstanding flexural and torsional rigidity as well as good constructability and safety. However, a steel box-girder bridge is uneconomical, requiring many secondary members and workmanship such as stiffeners and ribs requiring welding attachments to flanges or webs. Therefore, in US and Japan, a plate girder bridge, which is relatively cheap and easy to construct is generally used. One type of the plate girder bridge is the two- or three-main girder plate bridge, which is a composite plate girder bridge that minimizes the number of required main girders by increasing the distance between the adjacent girders. Also, for the simplification of girder section, the stiffener which requires attachment to the web is not required. The two-main steel girder plate bridge is a representative type of plate girder bridges, which is suitable for bridges with 10 m effective width and has been developed in the early 1960s in France. To ensure greater safety of two- or three-main girder plate bridges, a larger steel section is used in the bridge domestically than in Europe or Japan. Also, the total number of two- or three-main girder plate bridge constructed in Korea is significantly less than the steel box girder bridge due to a lack of designers' familiarity with more complex design detailing of the bridge compare to that of a steel box girder bridge design. In this study, a new construction method called Turn Over method is proposed to minimize the steel section size used in a two- or three-main girder plate bridge by applying prestressing force to the member using confining concrete section's weight to reduce construction cost. Also, a full scale 20 m Turn Over girder specimen and a Turn Over girder bridge specimen were tested to evaluate constructability and structural safety of the members constructed using Turn Over process.

Development of a Prestressed Plate Girder Forming Hybrid Sections of Hot-rolled H Beam and High-Strength Steel Plates (H형강과 고강도 강판으로 복합단면을 구성하는 프리스트레스트 플레이트거더의 개발)

  • Kyung, Yong Soo;Ahn, Byung Kuk;Bang, Jin Hwan;Kim, Moon Young
    • Journal of Korean Society of Steel Construction
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    • v.17 no.5 s.78
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    • pp.637-648
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    • 2005
  • Innovative prestressed steel plate girders were presented in this study. Hot-rolled H beams were loaded first, then relatively high-strengthsteel plates were welded on the top and bottom flanges of preloaded H beams. Finally, high prestressed plate (HiPP) girder was manufactured by simply releasing prestresses of rolled beams. To verify prestress distributions induced in this girder, the experimental study was conducted and some guidelines to manufacture these girders effectively were addressed. In addition, methods to determine the allowable bending stress of HiPP girders and to check welding stresses were addressed for design of temporary bridges. The efficiency and effectiveness of the present girder were demonstrated through design examples of temporary bridges adapting the prestress-induced girder or the plate girder of the same section without prestresses. As a result, it has been found to be possible that the span length of HiPP girders for temporary bridges is longer than that of girders without prestresses.