• Title/Summary/Keyword: 강합성거더

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Structural Performance Analysis of New Type CFTA Girder Bridge (신형식 CFTA 거더 교량의 구조성능평가)

  • Lee, Ji-O;Jeong, Min-Chul;Park, Kyung-Hoon;Kong, Jung-Sik
    • Journal of the Korean Society of Hazard Mitigation
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    • v.11 no.1
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    • pp.15-22
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    • 2011
  • In this research, static load test is performed to verify the arch effect and structural performance of CFTA(Concrete-Filled and Tied steel tubular Arch) girder, and FE(Finite Element) analysis is performed to investigate validity of the test result. CFTA girder is designed to maximize the benefit of each material, such as steel plate, filled concrete and PS tendon. Static load test is performed based on the frame-analysis result of 12m sample miniature model. The result of static load test is that structural performance and safety of CFTA girder are confirmed and there is different deflection mode with other structural form result from arch effect. FE analysis with ABAQUS is also performed to show the validity of the truck collision safety and static load test.

Behavior of Steel Box Girder Bridge According to the Placing Sequences of Concrete Slab (II) (강합성 상자형 교량의 바닥판 타설에 따른 거동 연구(II) - 해석적 연구 및 균열제어 -)

  • Kwak, Hyo Gyoung;Seo, Young Jae;Jung, Chan Mook;Park, Young Ha
    • Journal of Korean Society of Steel Construction
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    • v.12 no.2 s.45
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    • pp.133-142
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    • 2000
  • This study deals with behavior of steel box girder bridges according to the concrete slab casting sequences and sectional types. The time dependent behavior of bridges caused by the differential setting of slab concrete resulting from time gap for each part of slab deck in a sequential placing method produces is analyzed. In correlation studies between girder section types and placing sequences, time dependent effects of concrete creep and shrinkage are implemented in the analytical model proposed in the previous study. Finally, field recommendations in terms of concrete slump and relative humidity are suggested to prevent early transverse cracking of concrete slabs.

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Behavior of Main Girder in Continuous Girder System using Cross Girder Method (가로거더공법에서 주형의 연속화 시점에 따른 주형의 거동)

  • Park, Jeong-Ung;Seo, Won-Ju;Lee, Son-Ho
    • 한국방재학회:학술대회논문집
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    • 2008.02a
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    • pp.533-536
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    • 2008
  • It is on increasing trend to employ H-rolled beams as main flexural members of bridges and of temporary structures owing to their handiness for construction, maintenance, and management. But in the case of applying H-rolled beams to bridges, maximum length of bridge span is around 20m. Therefore, to develop simplified steel-concrete composite bridge having long span using H-rolled beam needs new cross girder system at internal supports, optimization of bridge system without cross beams between supports and steel-concrete composite bridge deck. This study performs mechanical analysis of cross girder system for H-rolled beam steel-concrete composite bridge with long span and verifies its usefulness.

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A Study on the Disposition of Cross Beams in Composite Plate Girder Bridge (강합성 플레이트거더교의 가로보 배치에 관한 연구)

  • Park, Yong Myung;Baek, Seung Yong;Hwang, Min Oh
    • Journal of Korean Society of Steel Construction
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    • v.14 no.6
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    • pp.691-699
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    • 2002
  • A study on the evaluationof the proper spacing and required bending rigidity of cross beams in composite multiple I-girder bridge without lateral and sway bracing system was performed. For the purpose, a two-lane 40m simple span and 40+50+40m continuous sample bridge with four girders was designed. For the sample bridges, structural analysis under the design loads including dead load before and after composite, live load, and seismic loads has been performed. The material and geometric nonlinear analysis under dead load before composite has also been performed to evaluate lateral buckling strength of the steel-girder-cross beam grillage. Based on the two phase anlayses, proper spacing and bending righidity of cross beams were proposed.

Experimental Study on the Flexural Behavior of Inverted T-Shaped Steel·Concrete Composite Deck for Bridges (역T형강·콘크리트 합성바닥판의 휨거동에 관한 실험적 연구)

  • Kim, Sung Hoon;Park, Young Hoon;Lee, Seung Yong;Choi, Jun Hyeok
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.28 no.3A
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    • pp.331-340
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    • 2008
  • This study is to suggest the details of new concept of bridge deck. Experimental studies on the behavior of a inverted T-shaped steelconcrete composite deck were carried out. The part of inverted T-shaped steel is embedded in concrete. Reinforced concrete deck specimen and composite deck specimens were fabricated and static bending fracture tests were conducted. The ultimate strength and fracture strength of specimens were evaluated. The effects of shear hole crossing bars of composite deck were also analyzed. From the results of experiments, composite deck with shear hole crossing bar increased shear strength, and showed typical tensile failure. Ultimate strength and fracture strength of composite deck with shear hole crossing bar are higher than those of reinforced concrete deck. The displacement of composite deck is higher than that of reinforced concrete deck.

A Study on Design Section of Composite Steel H-Beam Bridge Based on KRTA Design Specifications (도로교 설계기준을 적용한 초간편 H-형강 강합성 교량 설계단면 연구)

  • Park, Jong-Sup;Kim, Jae-Heung
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.9 no.6
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    • pp.1711-1717
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    • 2008
  • This paper presents an investigation on behavior of a simplified composite I-beam bridge(SCIB) based on Korea Bridge Design Specifications(2005). Simple and continuous span SCIBs are considered to determine the design cross section. A structural analysis program, MIDAS(2006), is used to obtain the stress and deflection of the SCIB. In order to evaluate the safety of the design cross section, three-dimensional analysis is performed using ABAQUS(2007). According to the verification results from stresses and deflections of the design section, the new composite bridge are safely used for developments of reasonable and economic SCIB.

Behavior of Stud Shear Connectors in Precast Deck using Lightweight Concrete (경량콘크리트를 사용한 프리캐스트 바닥판에서 스터드 전단연결재의 거동)

  • Cho, Sun Kyu;Lee, Jong Min;Youn, Seok Goo;Choi, Yun Wang
    • Journal of Korean Society of Steel Construction
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    • v.20 no.2
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    • pp.227-236
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    • 2008
  • The kind of concrete generally used in steel concrete composite bridges is normal-weight concrete whose unit weight is ${2,300kg/m^{3}}$. However, using lightweight concrete in composite bridges diminishes the sectional forces due to the self-weight of concrete decks. As a result, this will make the bridge design more economical. The type of concrete deck that could be adopted in composite bridges using lightweight con crete may be classified into Cast-In-Place (C.I.P.) concrete deck and precast concrete deck. These two types of decks have some differences with respect to structural behavior and constructional method, and hence,structural behavior of stud shear connectors that connect a concrete deck to a steel girder is changed with the type of deck used. In this study, push-out tests were conducted to evaluate the characteristics of static behavior of the stud shear connectors with a precast deck using lightweight concrete. Also, additional precast deck specimens with bedding layer that had shear keys and devices for transverse confinement of the bedding layer for the prevention of cracks occurring in the bedding layer were tested. These cracks The efficiency of these devices was then evaluated.

Fatigue Capacity Evaluation of the Girder-Abutment Connection for the Steel-Concrete Composite Rigid-Frame Bridge Integrated with PS Bar (PS 강봉으로 일체화된 강합성 라멘교의 거더-교대 접합부에 대한 피로 성능 평가)

  • Ahn, Young-Soo;Oh, Min-Ho;Chung, Jee-Seung;Lee, Sang-Yoon
    • Journal of the Korea Concrete Institute
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    • v.24 no.3
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    • pp.249-258
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    • 2012
  • Integral and rigid frame bridges have advantages in bridge maintenance and structural efficiency by eliminating expansion joints and bridge supports. However, the detail of typical girder-abutment connection is rather complex and increases construction cost depending on construction detail. For the purpose of compensating disadvantages such as complexity and additional cost, a new type of bridge is proposed in this study, which improves the efficiency of construction by simplifying the construction detail of girder-abutment connection. The proposed bridge has the connection detail of steel girder and abutment integrated by prestressed PS bar installed in the connection. In this study, finite element analysis and fatigue load test are conducted to evaluate the fatigue capacity of the proposed girder-abutment connection. The results of the finite element analysis revealed that the possibility of the fatigue damage in the girder-abutment connection is very low. The results of the fatigue load test verified that the integrity of the girder and abutment connection is maintained after 2,000,000 cycles of fatigue loading.

Reliability-Based Assessment of Structural Safety of Steel-Concrete Hybrid Cable-Stayed Bridge Erected by the FCM and FSM during Construction (FCM과 FSM공법에 의한 강-콘크리트 복합사장교의 신뢰성에 기초한 시공간 구조안전도평가)

  • Yoon, Jung Hyun;Cho, Hyo Nam
    • Journal of Korean Society of Steel Construction
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    • v.19 no.5
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    • pp.515-526
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    • 2007
  • In this study, the models and methods for the safety assessment of Steel-Concrete Hybrid Cable-Stayed Bridge, which consists of steel composite girder and concrete girder erected by the FCM(Free Cantilever Method) and FSM(Full Staging Method) are proposed for the assurance of structural safety and the prevention against bridge collapse during construction. By the structural reliability approach that reasonably considers the uncertainties associated with the resistance and the load effect, the resistance and the load distribution characteristics of Steel-Concrete Hybrid Cable-Stayed Bridgeare defined and the strength limit state equations of permanent structures and temporary structures during construction are suggested. An AFOSM algorithm and MCS technique are used for the reliability analysis of cables, pylons, girders, steel-concrete conjunction part and temporary bents. Also, component reliability analyses are performed at the construction stages based on the structural system model. To demonstrate their rationality and practicality, the proposed models and approaches are applied to a real bridge. The sensitivity analyses of main parameters are performed in order to identify the critical factors that control the safety of similar bridges. As a result, it may be stated that the proposed models could be implemented as a rational and practical approach for the safety assessment of Steel-Concrete Hybrid Cable-stayed bridges erected by FCM and FSM during construction.

Behavior of Steel Box Girder Bridge According to the Placing Sequences of Concrete Slab (I) (강합성 상자형 교량의 바닥판 타설에 따른 거동 연구(I) - 해석모델 및 현장실험 -)

  • Kwak, Hyo Gyoung;Seo, Young Jae;Jung, Chan Mook;Park, Young Ha
    • Journal of Korean Society of Steel Construction
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    • v.12 no.2 s.45
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    • pp.123-131
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    • 2000
  • In this study, both experimental and analytical study for behavior of the existing composite steel box girder bridges, constructed along with the procedure of continuous placing slab, are conducted to establish the validity of the proposed model. The layer approach is adopted to determine the equilibrium condition in a section to consider the different material properties and concrete cracking across the sectional depth, and the beam element stiffness is constructed on the basis of the assumed displacement field formulation and the 3-points Gaussian Integration. In addition, the effects of creep and shrinkage of concrete for time-dependent behavior of the bridge are taken into consideration. Finally, both analytical and experimental results are compared.

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