• Title/Summary/Keyword: Steel Bridge

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A comparison study for the Axial forte of Longer Rail (장척레일 축력 비교 연구)

  • Min, Kyung-Ju;Lee, Sung-Uk;Park, Dae-Hee
    • Proceedings of the KSR Conference
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    • 2009.05a
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    • pp.516-528
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    • 2009
  • Form the application of long rail system the non-ballast steel plate bridges, fatigue strength increase and rail noise reduction can be expected. This is mainly form the reduction of the rail impact at the rail joint locations which already made to behave together from welds. In the high speed rail, application of long rail system is essential because without long rail system, the required serviceability level can not be achieved. But even with this long rail systems, the thermal expansion from the girder can not be absorbed in the normal bearing systems, and these expansion cause between girder and rail. Also unexpected rail buckling and fracture through rail thermal tension may happen. It was found through numerical analysis and field measurement that these problems can be avoided by semi-fixed bearing system. In this study, the benefits of non-ballast plate bridge through long rail system, especially at the point of girder stability, girder stiffness increase and bearing maintenance will be reviewed.

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Nonlinear analysis of PSC bridge with strengthened of externally tendon Considering Construction Sequences (외부강선으로 보강된 PSC 교량의 시공단계별 비선형 해석)

  • Park, Jae-Guen;Lee, Byeong-Ju;Kim, Moon-Young;Shin, Hyun-Mock
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2007.04a
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    • pp.283-288
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    • 2007
  • This paper presents an analytical prediction of Nonlinear characteristics of prestressed concrete bridges by strengthened of externally tendon considering the work sequence, using beam-column element based on flexibility method and tendon element. The beam-column element was developed with reinforced concrete material nonlinearities which are based on the smeared crack concept. The fiber hysteresis rule of beam-column element is derived from the uniaxial constitutive relations of concrete and reinforcing steel fibers. The tendon element represent the bonded tendon and unbonded tendon behaviors. Beam-column element and tendon element was be subroutine A computer program, named RCAHEST (Reinforced Concrete Analysis in Higher Evaluation System Technology), for the analysis of RC and PSC structures was used. The proposed numerical method for prestressed concrete structures by strengthened of externally tendon is verified by comparison with reliable experimental results.

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Analytical Studies on Shape of Shear Pocket of Full-Depth Precast Slab (프리캐스트 바닥판의 전단포켓 형상에 관한 해석 연구)

  • Han Sang-Yun;Lee Man-Sup;Lee Seong-Rok;Song Jae-Joon;Kang Young-Jong
    • Proceedings of the KSR Conference
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    • 2004.10a
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    • pp.1119-1124
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    • 2004
  • Full depth precast concrete bridge deck system can be advantageously to reduce construction time, hence lowering the cost. This system has several significant design and construction component. To connect between the concrete slab and steel girder, precast deck has shear pocket. Post-tensioning tightens the joints and prevents any leakage though the joint. When post-tensioning is applied, stress concentration occurs in the edge of shear pocket. In this study, precast decks using four types of shear pocket is analyzed by F.E.M.

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An Experimental Study for the Failure Mode and the Ductility of a High Pier with a Hollow Section using a High Strength Cocnrete and Steel (고성능 중공단면 교각의 파괴모드 및 연성에 관한 실험적 연구)

  • Oh Byung Hwan;Choi Seung Won;Park Young Ho;Pang Gi Sung
    • Proceedings of the Korea Concrete Institute Conference
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    • 2005.05a
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    • pp.63-66
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    • 2005
  • Six RC pier were tested under a constant axial load and a cyclically reversed horizontal load to investigate the performance of RC piers used in the high strength concrete and the high strength rebar. It is designed with a hollow section according to the Korean Bridge Design Standard. The variables of the test were concrete strength, rebar strength, a ratio of lap splice and a ratio of transvere rebar. The test results show that the performance of a RC Pier; failure mode, crack pattern, maximum load and ductility.

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Reinforcement Location of Plate Girders with Two Longitudinal Stiffeners (플레이트 거더의 2단 수평보강재 보강 위치)

  • Son, Byung-Jik;Lee, Kyu-Hwan
    • Journal of the Korean Society of Safety
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    • v.24 no.6
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    • pp.93-102
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    • 2009
  • Because steel girder bridge has big slenderness ratio, buckling is very important in design. Local buckling of plate girders having two longitudinal stiffeners in different positions under various load conditions is investigated. Various parametric study according to the change of web height, transverse stiffeners and load conditions are examined. These parametric studies are performed by numerical simulation utilizing finite element method. The objective of this study is to present the rational reinforcement location of two longitudinal stiffeners. The results of analysis are compared to that recommended by korean specifications for road bridges(2003).

Analysis of Failure Reduction Properties Cementitious Composites with Reinforced Fiber by Impact of High Velocity Projectile (비상체의 고속 충격을 받는 시멘트복합체의 혼입 단섬유에 따른 파괴저감특성 분석)

  • Jeon, In-Woo;Kim, Gyu-Yong;Cheo, Gyeong-Cheol;Kim, Hong-Seop;Kim, Jung-Hyun;Han, Sang-Hyu
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2014.11a
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    • pp.186-187
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    • 2014
  • Flexural stress and fracture energy of fiber reinforced cementitious composites is increased by bridge effect of reinforced fiber, scabbing failure is restrained. Shape, properties of fiber were SF(steel fiber), PA(polyamide), NY(nylon) have effects on flexural stress and fracture energy, impact resistance improve of fiber reinforced cementitious composites. In this study, local failure properties by impact of high velocity projectile was analyzed by mixing 3 types of fiber which have different shape and properties respectively.

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Dynamic Behaviour of Pile Foundation with Scour (세굴을 고려한 말뚝기초의 동적 거동분석)

  • 김정환;허택영;박용명
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2003.10a
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    • pp.55-62
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    • 2003
  • This study considered the effect of scour depth on the behaviour of pile foundation of bridge structure under seismic excitation. The numerical model was composed of the superstructure, pile foundation and soil. The superstructure and pile was modeled by beam elements and soil was by spring elements. The pile head and concrete footing was considered as hinge and rigid connected situation, respectively. A toro-gap element was used to model the expansion joint of superstructure. Nonlinear dynamic analysis was carried out on the constructed model. It was acknowledged that the steel pile become to yield after the scour depth reached about 2.0m.

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Behaviour of lead-rubber bearings

  • Mori, Atsushi;Moss, P.J.;Carr, A.J.;Cooke, N.
    • Structural Engineering and Mechanics
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    • v.6 no.1
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    • pp.1-15
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    • 1998
  • Experimental work undertaken to investigate the behaviour of lead-rubber bearings under compression and a combination of compression and shear or rotation has been reported on elsewhere. However, it is difficult to determine the state of stress within the bearings in terms of the applied forces and the interaction between the lead plug and the steel shims and elastomeric layers. In order to supply some of the missing information about the stress-strain state within the bearings, an analytical study using the finite element method was carried out. The available experimental results were used to validate the model and although agreement was not as good as expected (on account of difficulties in modelling the lead plug), the analyses did provide some information about the state of the stress within the bearing.

Reinforced high-strength concrete square columns confined by aramid FRP jackets -part I: experimental study

  • Wang, Yuan-Feng;Ma, Yi-Shuo;Wu, Han-Liang
    • Steel and Composite Structures
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    • v.11 no.6
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    • pp.455-468
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    • 2011
  • Although retrofitting and strengthening reinforced concrete (RC) columns by wrapping fiber reinforced polymer (FRP) composites have become a popular technique in civil engineering, the study on reinforced high-strength concrete (HSC) columns is still not sufficient. The objective of these companion papers is to investigate the mechanical properties of reinforced HSC square columns confined by aramid FRP (AFRP) jackets under concentric compressive loading. In the part I of these companion papers, an experiment was conducted on 54 confined RC specimens and nine unconfined plain specimens, the considered parameters were the concrete strength, the thickness of AFRP jackets, and the form of AFRP wrapping. The experimental process and results are presented in detail. Subsequently, some discussions on the confinement effect, failure modes, strength, and ductility of the columns are carried out.

Adaptive Neuro Fuzzy Inference System (ANFIS) and Artificial Neural Networks (ANNs) for structural damage identification

  • Hakim, S.J.S.;Razak, H. Abdul
    • Structural Engineering and Mechanics
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    • v.45 no.6
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    • pp.779-802
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    • 2013
  • In this paper, adaptive neuro-fuzzy inference system (ANFIS) and artificial neural networks (ANNs) techniques are developed and applied to identify damage in a model steel girder bridge using dynamic parameters. The required data in the form of natural frequencies are obtained from experimental modal analysis. A comparative study is made using the ANNs and ANFIS techniques and results showed that both ANFIS and ANN present good predictions. However the proposed ANFIS architecture using hybrid learning algorithm was found to perform better than the multilayer feedforward ANN which learns using the backpropagation algorithm. This paper also highlights the concept of ANNs and ANFIS followed by the detail presentation of the experimental modal analysis for natural frequencies extraction.