• Title/Summary/Keyword: 슬래브 교량

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Wheel Load Distribution of Simply Supported Reinforced Concrete Slab Bridge (철근콘크리트 단순 슬래브 교량의 윤하중분포폭에 관한 연구)

  • 오병환;신호상;한승환
    • Magazine of the Korea Concrete Institute
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    • v.10 no.3
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    • pp.125-134
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    • 1998
  • 최근에 수행된 일련의 철근콘크리트 슬래브 교량의 파괴시험의 결과 비록 교량의 노후화되었다 하더라도 내하력은 설계하중보다 더 크게 나타나고 있다. 본 연구에서는 철근콘크리트 슬래브 교량의 이런 높은 내하능력을 보이는 여러 가지 원인들 가운데 가장 큰 영향을 줄 것으로 예상되는 슬래브 교량의 하중분배거동에 대한 연구를 수행하였다. 철근콘크리트 슬래브 교량의 윤하중분포폭에 영향을 미치는 주요 변수들에는 지간길이, 교량폭, 단부보, 하중형태 및 지점조건이 있다. 본 연구결과에 의하면 지간길이와 교폭에 따라 현행의 윤하중분포폭은 과소 혹은 과대 평가되고 있다. 이들 각 변수들에 대한 포괄적인 유한요소 해석과 분석을 통하여 철근콘크리트 슬래브 교량의 윤하중분포폭을 도출하였고 이들 결과들을 비선형 회귀분석을 통하여 슬래브 교량의 윤하중분포폭의 예측 및 설계식을 제안하였다. 본 연구에서 제안된 윤하중분포폭의 식은 철근콘크리트 슬래브 교량의 보다 정확한 설계 및 합리적인 내하력 산정시 매우 효율적으로 사용될 것으로 사료된다.

Long-Term Performance Evaluation of a GFRP Slab Bridge (GFRP 슬래브 교량의 장기성능 평가)

  • Ji, Hyo-Seon
    • Journal of Korean Society of Steel Construction
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    • v.24 no.3
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    • pp.349-360
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    • 2012
  • This paper describes a detailed assessment of the structural safety, serviceability, capacity rating and long-term performance of a glass fiber-reinforced polymer (GFRP) slab bridge superstructure. This first all-GFRP slab bridge was installed in Korea on May 2002. The GFRP slab bridge is a simply supported, its length is 10.0 m, and is designed to carry two-lane traffic and has an overall width of 8.0m. The GFRP slab bridge is a sandwich structure with a corrugated core, fabricated by hand lay-up process with E-glass fibers and vinyl ester resins. The assessment of long-term performance for the GFRP slab bridge in 2004, 2011 includes a field load testing identical to that performed in 2002. The assessment indicates that the GFRP slab bridge has no structural problems and is structurally performing well in-service as expected. The assessment may provide a baseline data for the capacity ratings assessment of the GFRP slab bridge and also serve as part of a long-term performance of all-GFRP bridge superstructure.

Analysis of Post-tensioned Slab Bridge by Means of Specially Orthotropic Laminates Theory (특별직교이방성 복합적층판 이론을 응용한 포스트텐션된 슬래브 교량의 해석)

  • Han, Bong Koo;Kim, Yun Pyo
    • Journal of Korean Society of Steel Construction
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    • v.14 no.1
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    • pp.105-111
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    • 2002
  • A post-tensioned slab bridge is analyzed by the specially orthotropic laminates theory. Both the geometry and the material of the cross section of the slab are considered symmetrical with respect to the mid-surface so that the bending extension coupling stiffness, $B_{ij}=0$, and $D_{16}=D_{26}=0$. Each longitudinal and transverse steel layer is regarded as a lamina, and material constants of each lamina is calculated by the use of rule of mixture. This bridge with simple support is under uniformly distributed vertical and axial loads. In this paper, the finite difference method and the beam theory are used for analysis. The result of beam analysis is modified to obtain the solution of the plate analysis. The result of this paper can be used for post-tensioned slab bridge analysis by the engineers with undergraduate study in near future.

Simple Method of Analysis for Concrete Slab Bridges by the Specially Orthotropic Laminates Theory (특별직교이방성 적층판이론에 의한 콘크리트 슬래브교량의 간편해석법)

  • Han, Bong-Koo;Suck, Jun-Ho
    • Journal of the Korean Society for Advanced Composite Structures
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    • v.1 no.2
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    • pp.59-65
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    • 2010
  • The simple supported reinforced concrete slab bridges are analyzed by the specially orthotropic laminates theory. This method, however, may be too difficult for some practising engineers. In this paper, the result of analysis for such plate by means of the beam theory with unit width is reported. By using the "correction factor", the accurate solution for the plate can be obtained by the beam theory. By using the "correction factor", the accurate solution for the plate can be obtained by the beam theory. The plate aspect ratio considered is from 1 : 1 to 1 : 6. The result of this paper can be used for simply supported slab bridges analysis.

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Wheel Load Distribution of Continous Reinforced Concrete Slab Bridge (연속 철근콘크리트 슬래브 교량의 윤하중 분포폭에 관한 연구)

  • 신호상;오병환
    • Magazine of the Korea Concrete Institute
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    • v.10 no.4
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    • pp.135-143
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    • 1998
  • The wheel load distribution width for lane load is not specified in current Korea bridge design code(KD code), not like in current AASHTO and AASHTO LRFD specifications which specity it as twice of wheel load distribution width for wheel load. In this study, the wheel load distribution width in continuous reinforced concrete slab bridge is investigated. The major variables affecting the wheel load distribution of a reinforced concrete continuous slab bridge are the span length, bridge width, existence edge beam and boundary condition. From a series of comprehensive parametric study on each variable, the formula for wheel load distribution in continuous reinforced concrete slab bridge is proposed from the nonlinear regression analysis of finite element analysis results. The proposed formulas can be used efficiently in the accurate design of continuous reinforced concrete slab bridges.

Simple Method of Vibration Analysis of Three Span Continuous Composite Slab Bridges with Elastic Intermediate Supports (탄성지지된 3경간 연속 복합슬래브교량의 간단한 진동해석)

  • Han, Bong Koo;Kim, Duk Hyun
    • Journal of Korean Society of Steel Construction
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    • v.17 no.3
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    • pp.317-324
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    • 2005
  • The specially orthotropic plate theory is used to analyse three-span continuous composite slab bridges with elastic intermediate supports. A method of calculating the natural frequency corresponding to the first mode of vibration of beams and tower structures, with irregular cross sections and with arbitrary boundary conditions, was developed and the result of application of this method to the three-span continuous composite slab bridges with elastic intermediate supports is presented. This type of bridge represents either concrete or sandwich type three-span bridge on polymeric supports for passive control or on actuators for active control. Any method may be used to obtain the deflection influence surfaces needed for this vibration analysis. The finite difference method is used for this purpose in this paper. The influence of flexural stiffnesses and the modulus of the foundation are studied.

Simple Method of Analysis for Reinforced Concrete Slab Bridges (간단한 방법에 의한 철근콘크리트 슬래브 교량의 해석)

  • Han, Bong-Koo;Kim, Duk-Hyun
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.7 no.4
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    • pp.81-89
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    • 2003
  • The simple supported reinforced concrete slab bridges are analyzed by the specially orthotropic laminates theory. This method, however, may be too difficult for some practising engineers. In this paper, the result of analysis for such plate by means of the beam theory with unit width is reported. By using the "correction factor", the accurate solution for the plate can be obtained by the beam theory. The result of this paper can be used for reinforced concrete slab bridges analysis by the engineers with undergraduate study in near future.

Reinforced Performance Evaluation of RC Slab Bridge Using Conclinic Advanced FiberWrep (유리섬유 복합재를 이용한 RC슬래브 교량의 보강성능평가)

  • Park, Soon-Eung;Park, Moon-Ho;Lee, Tack-Woo
    • Journal of the Korean Society of Hazard Mitigation
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    • v.10 no.5
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    • pp.35-40
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    • 2010
  • The present study proposes the strengthening method to use Conclinic Advanced FiberWrep(CAF) so as to improve Load Carrying Capacity of the RC slab bridge. In order to evaluate the strengthening performance, we strengthen 50cm per unit-width of CAF to the slab's bottom of the test bridge that designed with DB 18, then perform Static and Dynamic Field Load Test. As a result of this, 14.7% of the maximum displacement, 5.0% of the strain and 33.7% of the impact factor are reduced after strengthening. At the middle of the test spans, nominal resisting ratio is increased by 27% and Service Load Carrying Capacity is increased by 44.6%, 48.9% of each span 1 and 2. In conclusion, this study indicates that the strengthening method using CAF is very effective to improve the deteriorated RC slab bridge designed with DB 18, to the DB 24 of the first class bridge design load.