• Title/Summary/Keyword: steel girder

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Moment redistribution of continuous composite I-girder with high strength steel

  • Joo, Hyun Sung;Moon, Jiho;Sung, Ik-Hyun;Lee, Hak-Eun
    • Steel and Composite Structures
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    • v.18 no.4
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    • pp.873-887
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    • 2015
  • The continuous composite I-girder should have a sufficient rotation capacity (or ductility) to redistribute the negative bending moment into an adjacent positive bending moment region. However, it is generally known that the ductility of the high strength steel is smaller than that of conventional steel, and application of high strength steel can cause ductility problems in a negative moment region of the I-girder. In this study, moment redistribution of the continuous composite I-girder with high strength steel was studied, where high strength steel with yield stress of 690 MPa was considered (the ultimate stress of the steel was 800 MPa). The available and required rotation capacity of the continuous composite I-girder with high strength steel was firstly derived based on the stress-strain curve of high strength steel and plastic analysis, respectively. A large scale test and a series of non-linear finite element analysis for the continuous composite I-girder with high strength steel were then conducted to examine the effectiveness of proposed models and to investigate the effect of high strength steel on the inelastic behavior of the negative bending moment region of the continuous composite I-girder with high strength steel. Finally, it can be found that the proposed equations provided good estimation of the requited and available rotation capacity of the continuous composite I-girder with high strength steel.

Buckling Behaviors of Plate Girder with Corrugated Steel Web (파형 복부판을 갖는 플레이트 거더의 좌굴거동)

  • Ji, Hyo-Seon
    • Journal of Korean Society of Steel Construction
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    • v.23 no.2
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    • pp.221-228
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    • 2011
  • Because steel plate girder bridge has big slenderness ratio, buckling is a major design factor. The objective of this study is to analyze the buckling behaviors of plate girder with I-girder and corrugated steel web and to examine the advantages of plate girder with corrugated steel web. Various parametric study according to the change of web height, web thickness, and load condition are examined. It is shown that plate girder with corrugated steel web is more effective than plate girder with I-girder and proper corrugated angle(${\theta}$) is $15^{\circ}{\sim}22^{\circ}$.

A Behavior Analysis of Railway Steel Plate Girder Bridge in the Applying Resilient Panel Track System (방진제도시스템 적용에 따른 강철도 무도상 판형교의 거동 분석)

  • Choi, Jung-Youl;Eom, Mac;Kang, Duk-Man;Park, Yong-Gul
    • Journal of the Korean Society for Railway
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    • v.9 no.6 s.37
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    • pp.717-724
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    • 2006
  • The major objective of this study is to investigate the effects and application of improvement for railway steel plate girder bridge by resilient panel track system. It analyzed the mechanical behaviors of steel plate girder bridge with applying resilient panel track system on the finite element analysis and laboratory test for static & dynamic characteristics. As a result, the improvement of steel plate girder bridge with resilient panel track systems are obviously effective for the static & dynamic response which is non-ballast steel plate girder bridge. The analytical and experimental study are carried out to investigate resilient panel track system decrease vertical acceleration and deflection on steel plate girder bridge for serviceability. And the resilient panel track system reduced dynamic maximum displacements (about 59%) and stresses (about 82%), the increase of dynamic safety is predicted by adopting resilient panel track system. From the dynamic test results of steel plate girder bridge, it is investigated that vertical acceleration and deflection is very low with applying resilient panel track system. The servicing steel plate girder bridge with resilient panel track system has need of the reasonable improvement measures which could be reducing the effect of static and dynamic behavior that degradation phenomenon of structure by an unusual response characteristic and a drop durability.

A Behavior Analysis of Railway Steel Plate Girder Bridge in the applying Resilient Panel Track system (방진궤도시스템 적용에 따른 강철도 무도상 판형교의 거동 분석)

  • Lee, Si-Yong;Eom, Mac;Oh, Soo-Jin;Park, Yong-Gul
    • Proceedings of the KSR Conference
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    • 2006.11b
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    • pp.437-446
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    • 2006
  • The major objective of this study is to investigate the effects and application of improvement for railway steel plate girder bridge by resilient panel track system. It analyzed the mechanical behaviors of steel plate girder bridge with applying resilient panel track system on the finite element analysis and laboratory test for static & dynamic characteristics. As a result, the improvement of steel plate girder bridge with resilient panel track systems are obviously effective for the static & dynamic response which is non-ballast steel plate girder bridge. The analytical and experimental study are carried out to investigate resilient panel track system decrease vertical acceleration and deflection on steel plate girder bridge for serviceability. And the resilient panel track system reduced dynamic maximum displacements(about 59%) and stresses(about 82%), the increase of dynamic safety is predicted by adopting resilient panel track system. From the dynamic test results of steel plate girder bridge, it is investigated that vertical acceleration and deflection is very low with applying resilient panel track system. The servicing steel plate girder bridge with resilient panel track system has need of the reasonable improvement measures which could be reducing the effect of static and dynamic behavior that degradation phenomenon of structure by an unusual response characteristic and a drop durability.

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An Application of Micro-GA for the Design Optimization of Steel Box Girder Bridges (강상형교 설계최적화를 위한 마이크로 유전알고리즘의 적용)

  • 김제헌;류연선;김정태;조현만
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2001.04a
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    • pp.154-161
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    • 2001
  • A procedure of the design optimization for steel box girder bridges using micro genetic algorithms(μGA) is developed. The effect of population size is investigated and the efficiency and reliability of μGA is demonstrated in the optimum design of steel box girder bridges. Optimum design problems of steel box girder bridges are formulated, where tile design of concrete slab is based on the USD specifications and steel box girder based on LRFD respectively. Design of optimizations of single-span and 2-span steel box girder bridges are performed with the population size of 5, 40, 80, and 120, respectively The μGA-based optimum design of the 3-span steel box girder bridge is compared with SQP results.

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A Study on the Safety Assessment of the Steel Box Girder Bridge (강상형교의 안전도 평가에 관한 연구)

  • 채원규
    • Proceedings of the Korean Institute of Industrial Safety Conference
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    • 1997.11a
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    • pp.151-156
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    • 1997
  • In this thesis, the safety assessment of the steel box girder bridge were studied. From the structural analysis results of the steel box girder bridge, bending moment and shear force were calculated, and these element force was applied to the safety assessment of the steel box girder bridge.

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Experimental Study for the Development of Steel-Confined Prestressed Concrete Girder (강재로 구속된 프리스트레스트 콘크리트 합성거더의 개발을 위한 실험연구)

  • Kim, Jung Ho;Park, Kyung Hoon;Hwang, Yoon Koog;Choi, Young Min;Cho, Hyo Nam
    • Journal of Korean Society of Steel Construction
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    • v.14 no.5 s.60
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    • pp.593-602
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    • 2002
  • A new type of bridge superstructures referred to as Steel-Confined Prestressed Concrete Girder (SCP Girder) was developed, which is composed of concrete, steel plate, and prestressing tendon. The girder may maximize structural advantages of these components; thus, long span bridges with low height girder may be constructed. For the effective design and fabrication of the gilder, the design software program was developed and the process of fabrication established. The experimental girder designed using the program was manufactured in actual size to confirm the fabric ability of the girder. Propriety of design, structural safety, and applicability of the gilder were verified through the load test.

Life-Cycle Cost Optimization for Steel Box Girder Bridges (강상자형교의 생애주기비용 최적설계)

  • 조효남;민대홍;권우성;정기영
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2001.04a
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    • pp.128-136
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    • 2001
  • This paper presents an optimum deck and girder system design for minimizing the life-cycle cost (LU) of steel box girder bridges. The problem of optimum LCC design of steel box girder bridges is formulated as that of minimization of the expected total LCC that consists of initial cost, maintenance cost, expected retrofit costs for strength, deflection, and crack. To demonstrate the effect of LCC optimum design of steel box girder bridges, the LCC optimum design is compared with conventional design method for steel box girder bridges design. From the numerical investigations, it may be positively stated that the optimum design of steel box girder bridges based on LCC will lead to more rational, economical and safer design.

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Behavior of Concrete-Filled and Tied Steel Tubular Arch Girder (콘크리트 충전 타이드 아치형 강재 합성거더의 선형 거동 분석)

  • Lee, Hak;Park, Ho;Lee, Eun-Ho;Kim, Jung-Ho;Kong, Jung-Sik
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2007.04a
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    • pp.688-693
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    • 2007
  • Nowadays various studies related with superstructure of bridges are developed and they pursuit more effective section of bridges superstructure, material and economical application of composite materials. CFT structure(Concrete Filled Steel Tubular Structure) is developed type of composite structure that concrete is filled with steel box, and the deformation of the member, stiffness and internal force will be improved by confinement effect of steel box and concrete. This paper introduces new type of girder, CFTA girder( Concrete- Filled and Tied Steel Tubular Arch Girder) which is combined with traditional CFT structure,arch effect and prestress through carrying out the structural analysis by computer programs. The computer programs which is used are ABAQCS and MIDAS, and the 12.2m girder which is applied same load and prestresses is analyzed and compared the results respectively.

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An Experimental Study on Flexural Behavior of Continuous Prestressed Steel I-Girder with Section Increasement at Internal Supports (지점부 단면형고 확대를 도입한 연속 프리스트레스트 Steel I-Girder의 휨거동에 관한 실험적 연구)

  • Kim, Kyung-Min;Hong, Sung-Nam;Yang, Dong-Suk;Park, Sun-Kyu
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.10 no.6
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    • pp.143-153
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    • 2006
  • The paper presents the results of a study on improvement in flexure capacities of continuous prestressed steel I-girder with section increasement at internal supports. After tensioning, the field experiment on prestressed steel I-girder has been performed in the various aspects of prestressed I-girder introducing section increasement at internal supports, tendon profile.