• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2008년도 추계 학술발표회 제20권2호
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• pp.217-220
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• 2008

FRP-콘크리트 합성 바닥판을 개선하여 사장교에 경제적으로 적용 가능한 바닥판을 개발하고, 이의 설계 및 경제성 등을 제시한다. 기존의 FRP-콘크리트 합성 바닥판은 탄성계수가 낮은 GFRP 패널의 채용으로 인하여 낮은 단면 강성을 갖게 되는데, 이는 바닥판의 처짐 등과 같은 사용성 문제를 야기할 수 있다. 그래서 기존 FRP-콘크리트 합성 바닥판의 양단을 콘크리트로 감싸서 순지간이 줄어드는 효과를 얻을 수 있는 프리캐스트 FRP-콘크리트 바닥판을 고안하였다. 이 바닥판은 기존 바닥판에 비해 바닥판 지간은 늘어나면서 자중은 크게 늘지 않는 장점을 가진다. 이러한 개선된 바닥판에 대해 거더와 합성하는 경우, 거더 위에서 단순지지하는 경우로 나누어 단면 최적화를 수행하였다. 최적화된 바닥판을 중앙지간 540m인 사장교에 적용한 결과, 상부구조 및 케이블 물량의 감소 효과를 얻을 수 있어 경제적으로 적용될 수 있음을 확인하였다.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2006년도 정기 학술대회 논문집
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• pp.922-927
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• 2006

There is a concern with worldwide deterioration of highway bridges, particularly reinforced concrete. The advantages of fibre reinforced plastic(FRP) composites over conventional materials motivate their use in highway bridges for replacement of structures. Recently, an FRP deck has been installed on a state highway, located in New York State, as an experimental project. In this paper, a systematic approach for analysis of this FRP deck bridge is presented. Multi-step linear numerical analyses have been performed using the finite element method to study the structural behavior and the possible failure mechanism of the FRP deck-superstructure system Deck's self-weight and ply orientations at the interface between steel girders and FRP deck are considered in this study. From this research, the results of the numerical analyses were corroborated with field test results. Analytical results reveal several potential failure mechanism for the FRP deck and truss bridge system The results presented in this study may be used to propose engineering design guideline for new and replacement FRP bridge deck structure.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2004년도 춘계 학술발표회 제16권1호
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• pp.746-749
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• 2004

A new-type of FRP-concrete composite bridge deck system is proposed and its behaviors are experimentally studied. The new-typedeck consists of FRP as a permanent form and main tension resisting member and concrete as a compression resisting member. A suitable bonding method such as silica coating is applied to the interface between FRP and concrete to ensure composite behavior. The proposed deck system uses the box-shape FRP member, while a typical FRP-concrete composite deck uses the I-shape FRP member. Theproposed deck system has inherent advantages of a FRP-concrete composite deck like corrosion free and easy construction. The new-type deck shows the equal performances compared to a previous one, and has the advantage of reducing self-weight. In this study, the static tests on 3-span FRP-concrete decks in full scale are carried out, so that load-displacement relation, stress distribution, failure mode and design criteria are analyzed. The test results show that the deflection design criterion (L/800, L: span length) is satisfied at the service load state. No concrete tensile crack occurs in the negative moment region above the main girder, regardless of no tensile reinforcement at upper concrete portion.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2006년도 정기 학술대회 논문집
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• pp.928-931
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• 2006

Due to their light weight, high stiffness-to-weight and strength-to-weight ratios, and potentially high resistance to environmental degradation, resulting in lower life-cycle costs, polymer composites, are increasingly being considered for use in civil infrastructure applications. Recently, an FRP deck has been installed on a state highway, located in New York State. In this study, a thermal stress analysis was conducted using finite element method to study failure mechanisms of the superstructure. This analysis evaluated small and large temperature gradient effects on the FRP deck considering lightweight of FRP deck and ply orientations at the interface between steel girders and FRP deck Finite element model was verified using the load tests of the bridge deck. Finally, the analytical results shows the possible failure mechanism of FRP deck under various temperature changes and its corresponding index is suddenly varied depending on the rapid change of temperature on the deck plate.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2010년도 춘계 학술대회 제22권1호
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• pp.45-46
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• 2010

사장교에 경제적으로 적용가능한 장지간 프리캐스트 FRP-콘크리트 합성 바닥판에 대하여 피로 성능 평가를 수행하였다. 실험으로부터 프리캐스트 FRP-콘크리트 합성 바닥판은 충분한 피로 성능을 가짐을 확인하였다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2005년도 봄학술 발표회 논문집(I)
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• pp.379-382
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• 2005

Composite behavior between FRP-concrete composite deck and girder is investigated by numerical analysis and parametric experiments. Compared to reinforced concrete deck, the weight of FRP-concrete composite deck is about 64$\%$ but the performance of composition is 90$\%$. Therefore the FRP-concrete composite deck has the advantage of longitudinal section stiffness increase in case of composition to the girder. The experiment, according to the variation of stud diameter, stud length and bedding thickness, is carried out. As a result, the static failure strength increases as stud diameter and length increase and bedding thickness decreases.

• 한국구조물진단유지관리공학회 논문집
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• 제10권5호
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• pp.211-217
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• 2006

본 연구는 복합재료 교량의 온도변화에 따른 정밀해석과 이를 통한 복합재료 교량의 파괴거동을 조사하였다. 그 결과 매우 높은 주변 온도에서 복합재료 상 하부 표면의 파괴지표가 Core 요소의 파괴지표에 비하여 상대적으로 작은 값을 나타내어 충분한 온도 수용력이 있음이 나타났으며, 화재로 인해 급격한 온도변화 발생 할 경우 vinyl ester resin의 유리변화 온도 즉, $504^{\circ}C$에 근접함에 따라 국부적인 지역의 큰 온도경사가 발생하여 Tsai-Hill 파괴지표 또한 크게 변함을 나타났다.

• 한국구조물진단유지관리공학회 논문집
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• 제11권2호
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• pp.93-102
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• 2007

FRP바닥판은 경량이기 때문에 신속한 시공이 가능하고, 고정하중을 경감시킬 수 있다는 장점이 있어 전 세계적으로 시공 실적이 점차 증가하고 있다. 본 논문에서는 효과적인 FRP바닥판의 적용을 위하여 유한요소해석을 통하여 FRP바닥판을 구성하는 부재별 적정 형상비를 결정하였으며, 향후 FRP바닥판 설계시 기초자료로 활용할 수 있도록 하고자 하였다. 또한, FRP의 이방적 재료 특성과 복잡한 제약조건을 고려한 FRP바닥판의 최적설계를 수행하였으며, 그 결과를 토대로 제안된 FRP바닥판의 기본 단면 형상에 대한 검증을 수행하였다.

• 한국복합재료학회:학술대회논문집
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• 한국복합재료학회 2004년도 춘계학술발표대회 논문집
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• pp.13-17
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• 2004

In recent years, the deterioration of reinforced concrete structures has become a serious problem in civil engineering fields. This situation is mainly due to corrosion of steel reinforcing bars embedded in concrete. Recently, there has been a greatly increased demand for the use of FRP (fiber reinforced plastic) in civil engineering field due to their superior mechanical and physical properties. This paper presents an experimental study on the behavior of concrete bridge deck reinforced with FRP Box, FRP Plate, and FRP Re-bar. In tlIe study, mechanical properties of FRP Box, FRP Plate, GFRP Re-bar, and CFRP Grid have been investigated. Full scale one-way deck slab was tested under four point lateral load (equivalent to actual wheel load of DB-24 including impact). Load-deflection and load-strain data were collected through LVDT's and strain gages attached to the specimen.

• Computers and Concrete
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• 제20권2호
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• pp.215-227
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• 2017

A finite element model (FEM) for predicting early-age behavior of reinforced concrete (RC) bridge deck slabs with fiber-reinforced polymer (FRP) bars is presented. In this model, the shrinkage profile of concrete accounted for the effect of surrounding conditions including air flow. The results of the model were verified against the experimental test results, published by the authors. The model was verified for cracking pattern, crack width and spacing, and reinforcement strains in the vicinity of the crack using different types and ratios of longitudinal reinforcement. The FEM was able to predict the experimental results within 6 to 10% error. The verified model was utilized to conduct a parametric study investigating the effect of four key parameters including reinforcement spacing, concrete cover, FRP bar type, and concrete compressive strength on the behavior of FRP-RC bridge deck slabs subjected to restrained shrinkage at early-age. It is concluded that a reinforcement ratio of 0.45% carbon FRP (CFRP) can control the early-age crack width and reinforcement strain in CFRP-RC members subjected to restrained shrinkage. Also, the results indicate that changing the bond-slippage characteristics (sand-coated and ribbed bars) or concrete cover had an insignificant effect on the early-age crack behavior of FRP-RC bridge deck slabs subjected to shrinkage. However, reducing bar spacing and concrete strength resulted in a decrease in crack width and reinforcement strain.