• Title/Summary/Keyword: Steel deck

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Experimental and numerical study on shear studs connecting steel girder and precast concrete deck

  • Xia, Ye;Chen, Limu;Ma, Haiying;Su, Dan
    • Structural Engineering and Mechanics
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    • v.71 no.4
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    • pp.433-444
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    • 2019
  • Shear studs are often used to connect steel girders and concrete deck to form a composite bridge system. The application of precast concrete deck to steel-concrete composite bridges can improve the strength of decks and reduce the shrinkage and creep effect on the long-term behavior of structures. How to ensure the connection between steel girders and concrete deck directly influences the composite behavior between steel girder and precast concrete deck as well as the behavior of the structure system. Compared with traditional multi-I girder systems, a twin-I girder composite bridge system is more simplified but may lead to additional requirements on the shear studs connecting steel girders and decks due to the larger girder spacing. Up to date, only very limited quantity of researches has been conducted regarding the behavior of shear studs on twin-I girder bridge systems. One convenient way for steel composite bridge system is to cast concrete deck in place with shear studs uniformly-distributed along the span direction. For steel composite bridge system using precast concrete deck, voids are included in the precast concrete deck segments, and they are casted with cast-in-place concrete after the concrete segments are erected. In this paper, several sets of push-out tests are conducted, which are used to investigate the heavier of shear studs within the voids in the precast concrete deck. The test data are analyzed and compared with those from finite element models. A simplified shear stud model is proposed using a beam element instead of solid elements. It is used in the finite element model analyses of the twin-I girder composite bridge system to relieve the computational efforts of the shear studs. Additionally, a parametric study is developed to find the effects of void size, void spacing, and shear stud diameter and spacing. Finally, the recommendations are given for the design of precast deck using void for twin I-girder bridge systems.

Parameter Study for the Application of Ultra Thin Polymer Concrete Pavement (초박층 폴리머콘크리트 포장적용을 위한 매개변수 해석)

  • Yoon, Sang il;Jang, Yong joon;Choi, Jinwoong;Hong, Sungnam;Park, Sun-Kyu
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.19 no.6
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    • pp.46-54
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    • 2015
  • Base on Korean design code, previous design code had not considered the effect of pavement on the orthotropic steel deck, however recent design code (Limit State Design Method, 2012) allowed to consider the effect of pavement on the orthotropic steel deck, and efforts to apply the stiffness of pavement to the deck continue. Meanwhile, research on the effect of ultra thin bridge deck overlay on the orthotropic steel deck is inadequate, previous study was limited in about fatigue stress and performance between pavement layer and the orthotropic steel deck. In this study, according to changing of pavement layer stiffness application, pavement materials, pavement thickness and steel deck thickness, analysis of deflection. In addition to base on this result, consider effectiveness of ultra-thin pavement stiffness application on the orthotropic steel deck.

An Experimental Study on the Fatigue Behavior of Steel-Concrete Composite Bridge Deck (강-콘크리트 합성 교량 바닥판의 피로거동에 대한 실험적 연구)

  • 심정욱;김상효;정연주;박휘립
    • Proceedings of the Korea Concrete Institute Conference
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    • 2003.05a
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    • pp.499-504
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    • 2003
  • Future bridge decks must have high load-resistance capacity as well as fatigue strength to withstand the increase in traffic loading and the increase in span length between girders due to the decrease in the number of main girders. Steel-concrete composite bridge decks may be proper deck types to satisfy such requirements. To promote the application of composite bridge decks, a rational process to predict and evaluate the fatigue behavior of steel concrete composite bridge deck is required. Various types of steel-concrete composite bridge decks have been developed in many countries. In this study, combining advantages of the existing composite deck types, a new type of composite bridge deck is proposed. An experimental study is performed to examine the fatigue behavior of the proposed composite bridge deck. This composite bridge deck consists of corrugated steel sheet, welded T-beams, stud-type shear connectors and reinforced concrete filler. The fatigue tests are conducted under four-point bending test with three different stress ranges in constant amplitude. The fatigue category of the fillet welding between corrugated steel sheet and the T-beam is evaluated based on the S-N data obtained from the experiment.

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Recommended properties of elastic wearing surfaces on orthotrotropic steel decks

  • Fettahoglu, Abdullah
    • Steel and Composite Structures
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    • v.18 no.2
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    • pp.357-374
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    • 2015
  • Orthotropic decks composed of deck plate, ribs, cross beams and wearing surface are frequently used in industry to span long distances due to their light structures and load carrying capacities. As a result they are broadly preferred in industry and there are a lot of bridges of this type exist in the world. Nevertheless, some of them cannot sustain the anticipated service life and damages in form of cracks develop in steel components and wearing surface. Main reason to these damages is seen as the repetitive wheel loads, namely the fatigue loading. Solutions to this problem could be divided into two categories: qualitative and quantitative. Qualitative solutions may be new design methodologies or innovative materials, whereas quantitative solution should be arranging dimensions of deck structure in order to resist wheel loads till the end of service life. Wearing surface on deck plate plays a very important role to avoid or mitigate these damages, since it disperses the load coming on deck structure and increases the bending stiffness of deck plate by forming a composite structure together with it. In this study the effect of Elastic moduli, Poisson ratio and thickness of wearing surface on the stresses emerged in steel deck and wearing surface itself is investigated using a FE-model developed to analyze orthotropic steel bridges.

A Nonlinear Analysis on the Unit Model of Steel-Concrete Hybrid Deck for Bridges (교량용 강ㆍ콘크리트 합성 바닥판의 단위모델에 대한 비선형 해석)

  • 정광회;정연주;구현본;김정호;김병석
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2003.04a
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    • pp.85-91
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    • 2003
  • This paper presents a 3D nonlinear analysis with slip in steel-concrete hybrid deck. In this study, it was founded that the limit slip modulus could classify the states of steel-concrete hybrid deck into three parts as full-composite, partial-composite, and non-composite, considering the longitudinal behavior and end-slip as well as the yield load and ultimate load of it. Also, it proved that the stress of lower steel plate at the support was increased, because of frictional forces by reaction forces in the steel-concrete hybrid deck. The end-slip did not occur near the full-composite state, but it was largely increased as the slip modulus decreased. On the basis of the EC 4, the state of steel-concrete hybrid deck classified into brittle behavior and ductile one using the end-slip of it

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Thermal Effects of Asphalt Pavement on Steel Deck Arch Bridge (강바닥판 아치교의 아스팔트 포장 열영향)

  • Lee Wan-Hoon;Lee Tae-Yeol;Chung Heung-Jin
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2006.04a
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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.

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An Experimental Study on Bending Behaviour of Steel Grid Composite Deck Joint (격자형 강합성 바닥판 이음부의 휨거동에 관한 실험적 연구)

  • Shin, Hyun Seop;Lee, Chin Hyung;Park, Ki Tae
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.16 no.5
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    • pp.68-77
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    • 2012
  • The joint of existing steel grid composite deck is composed of lap splice of reinforcing bar with end hooks and field-placed concrete. In this study, bending tests of deck joint composed of concrete shear key and high tension bolts are carried out for the design variable, concrete shear key strengthened with steel plate or not, and test results are compared with flexural performance of the existing deck joint. Test results showed that the mechanical deck joint has about 30% ~ 60% more ultimate bending strength than the existing joint. According to analysis results of moment-curvature relationship, the initial bending stiffness of the existing deck joint is some higher than that of mechanical joint. But, after crack failure the structural performance of the existing deck joint is rapidly reduced. Furthermore, the deck joint with the strengthened shear key with steel plate has more bending moment capacity than the deck joint without strengthening. And strengthening of shear key has positive influence on the increase of bending stiffness.

Structural Performance Evaluation on Flexural and Shear Capacity for Weight Reducing Steel Wire-Integrated Void Deck Plate Slab (자중저감 철선일체형 중공 데크플레이트 슬래브의 휨 및 전단내력에 대한 구조성능평가)

  • Kim, Sang-Seup;Ryu, Deog-Su;Boo, Yoon-Seob
    • Journal of Korean Society of Steel Construction
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    • v.24 no.4
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    • pp.411-422
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    • 2012
  • The purpose of this study is to evaluate the flexural and shear capacity of steel wire-integrated void deck plate slabs. In order to evaluate flexural and shear capacity, we make five 150mmspecimens and three 200mmspecimens by slab depth as main variable. Each series of specimen is comprised of an existing steel wire-integrated deck-plate slab and two specimens using topping depth as variable. From the series of experiments, steel wire-integrated void deck plate slabs has any decline in flexural and shear performance. Therefore, a void-deck-plate slab which inserts Omega-steel plate showed reducing a using concrete-volume and had flexural and shear capacity following existing steel wire-integrated deck-plate.

An Experimental Study on the Vibration and Fire Resistance of Steel Void Deck Plate Slab for Omega-steel plate (오메가형 강판을 중공체로 사용한 데크플레이트 슬래브의 진동 및 내화에 관한 실험적 연구)

  • Kim, Sang-Seup;Ryu, Deog-Su
    • Journal of Korean Society of Steel Construction
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    • v.23 no.6
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    • pp.705-713
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    • 2011
  • This study was conducted to assess the vibration capacity and the fire resistance capacity of a deck plate slab using an omega steel plate as the void deck plate. First, to evaluate the vibration capacity of the deck plate slab after the insertion of the omega steel plate, three 150mm specimens and three 200mm specimens were made using the slab depth as the main variable. Each specimen consisted of an existing deck plate and two specimens, using the topping depth as the variable according to the slab depth. Second, two real-size specimens were made to evaluate the fire resistance capacity. The results of the test showed that the steel-wire-integrated deck plate slab that was inserted in the omega steel plate did not have a vibration problem due to the void deck plate, because the natural frequency was 12.66-14.09 Hz in the vibration test, and each specimen satisfied the appraisal standards for the load capacity, heat block quality, and chloride inhibition for two hours in the fire resistance test. Consequently, the steel-wire-integrated deck plate slab that was inserted in the omega steel plate can be reduced using the concrete volume and can have higher vibration and fire resistance capacities, similar to the existing deck plate.

Behavior of Members in the Unit Model of Steel-Concrete Hybrid Deck for Bridges (교량용 강ㆍ콘크리트 합성 바닥판 단위모델의 부재별 거동 특성)

  • 정광회;정연주;김병석
    • Proceedings of the Korea Concrete Institute Conference
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    • 2003.05a
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    • pp.493-498
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    • 2003
  • The 3D nonlinear analysis for steel-concrete hybrid deck is carried out by utilizing 2D plane interface element. The effect of the slip occurred between steel and concrete can be modeled by this element. This analysis focuses on not only global behavior of steel-concrete hybrid deck but also local behaviors of members of it such as lower steel plate, I-beam, and concrete which are varied by slip modulus. In this analysis, it was founded that the limit slip modulus could classify the states of steel-concrete hybrid deck into three parts such as full-composite, partial-composite, and non-composite, considering the behavior of lower steel plate, I-beam, and concrete at the mid span and the support as well as the yield load and ultimate load of it.

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