• Title/Summary/Keyword: Glass fiber-Steel plate(GSP)

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Experimental Investigation of the Shear Behavior of RC Beams Strengthened with Glass Fiber-Steel Composite Plate(GSP) (유리섬유-강판 복합재료(GSP)로 보강된 RC 보의 전단거동에 관한 실험적 연구)

  • Jang, Jun-Hwan;Kim, Seong-Do;Cho, Baik-Soon;Cheung, Jin-Hwan
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.11 no.1
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    • pp.130-140
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    • 2007
  • Fiber-sheet and steel-plate strengthening methods have been mainly used for strengthening the RC structures. However, recently the application of these two methods have dramatically decreased due to premature debonding failure between concrete surface and fiber-sheet and heavy self-weight of steel-plate. This article presents experimental results of shear behavior in RC beams strengthened with GSP(Glass fiber-Steel composite Plate). The thin steel plate in GSP makes usage of the anchoring system possible, which could delay or prevent the premature debonding failure. Three reference beams and 60 strengthened beams with GSP were tested. The experimental results showed that strengthened beams with GSP considerably increased in shear capacity compared with the reference beams.

An Experimental Study on Strengthening Performance of RC Slab used of Surface Bonded Method of GSP and CFRP Sheet (GSP와 CFRP 쉬트의 표면부착공법을 이용한 RC 슬래브의 보강성능 평가에 관한 실험적 연구)

  • Ahn, Ki-Man;Kim, Kwang-Soo;Park, Sun-Kyu;Lee, Young-Jae
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.11 no.6
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    • pp.95-102
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    • 2007
  • Recently, an improved capacity for RC bridges is required by their deterioration or necessary to carry traffic increase. Strengthening is known as a better way to improve capacity of bridges than reconstructing in terms of economy. The surface bonded method, which is normally used with FRP material, has some advantages related to conveninent application and time-save among other strengthening methods. FRP material is light and has high tensile strength compared to steel. Therefore, this paper presents how structural capacity strengthed with CFRP sheet and Glass fiber-Steel Plate (GSP) is improved.

Flexural Behaviors of Reinforced Concrete Beams Strengthened with Fiber-Steel Composite Plates (섬유-강판 복합플레이트로 보강된 RC 보의 휨 거동에 관한 연구)

  • Cho, Baik-Soon;Kim, Seong-Do
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.21 no.5
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    • pp.483-491
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    • 2008
  • The effectiveness of a new fiber-steel composite plate designed specifically to be used for strengthening of reinforced concrete members has been investigated. Twelve reinforced concrete beams were tested. Seven of the beams were strengthened with carbon fiber-steel composite plate(CSP), four of the beams were strengthened with glass fiber-steel composite plate(GSP), and one beam was used as a control specimen. The experimental results showed that new strengthening system controls the premature debonding and provides a more ductile failure mode than other conventional strengthening systems. The observed ductility ratios were $3.01\sim3.81$ and $3.55\sim4.95$ for strengthened beam with CSP and GSP, respectively. The maximum load was increased by 115% and 107% for strengthened beam with CSP and GSP, respectively, comparing with control beam. In addition, experimental and analytical results were well agreed.

A Study on the Shear Strengthening Effect of Reinforced Concrete Beams with Structural Damage (구조적 손상을 입은 철근콘크리트 보의 전단보강 효과에 관한 연구)

  • Shin, Yong-Seok;Kim, Jeong-Hoon;Kim, Jeong-Sup;Kim, Kwang-Seok;Cho, Cheol-Hee
    • Journal of the Korea Institute of Building Construction
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    • v.8 no.5
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    • pp.43-51
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    • 2008
  • This study examines shear capacity performance and structural characteristics of reinforced concrete beam using carbon fiber sheet(CFS), g)ass fiber sheet(GFS), glass fiber steel plate(GSP) and carbon fiber bar CB) which are reinforcing materials for reinforced concrete beam in order to produce similar condition to repair and reinforce actual structure and aims to provide data available In designing and constructing reinforced concrete structures under the structural damage. This study obtains the following conclusions. After considering the shear experiment results. it was indicated that the CB reinforced test object was the best in the shear capacity improvement and ductility capacity as it was contained in the concrete and was all operated, Also, GFS reinforced test object indicated the reduced flexural capacity but good shear capacity. GSP reinforced test object had bigger reinforcing strength than other reinforcing test objects. On the other hand, it showed the lowest reinforcement effect as compared section thickness of reinforced material because it showed the bigger relativity a section thickness of reinforced material. If the adherence to the concrete is improved, it will seem to show bigger reinforcement effect.

A Study on the Fatigue Strength of the Reinforced Concrete Beams Repaired with Glass Fiber Reinforced Polymer(GFRP) Bar and Glass Fiber Steel Plate(GSP) (GFRP Bar 및 GSP로 보수된 철근 콘크리트 보의 피로강도 연구)

  • Kim, Jae-Young;Kim, Chung-Ho
    • Journal of Korean Society of Coastal and Ocean Engineers
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    • v.21 no.2
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    • pp.191-195
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    • 2009
  • After developing the pre-crack to simulate a damaged reinforced concrete beam, fatigue test was conducted on the beam repaired by GFRP Bar and GSP embedded method. In the result of fatigue test, most residual displacement and crack of the experimental beams occurs in the early loading cycle and an increasing rate of these due to number of cycles were insignificant. Comparing with a non-repaired beam, a static strength of the repaired beam greatly increased, but fatigue strength decreased. In S-N curves, fatigue strength of the beam repaired by GFRP Bar and GSP was 58%, 52% of the static strength respectively.

An Experimental Study on the Shear Behavior of the RC Beams Strengthened with GSP (GSP로 보강된 RC보의 전단거동에 관한 실험적 연구)

  • Jang Jun Hwan;Cheung Jin Hwan;Kim Seong Do;Cho Baik Soon;Heo Seong Jai;Park Sang Tae
    • Proceedings of the Korea Concrete Institute Conference
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    • 2005.11a
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    • pp.149-152
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    • 2005
  • In recent years, the repair of damaged reinforced concrete members strengthened by the external bonding of fiber-reinforced polymer laminates has received considerable attention. This paper investigates shear capacity of RC beams strengthened in the shear span with the Glass-Fiber and Steel-Composite Plate(GSP) experimentally. There are 2 types of strengthening method by GSP in RC beams. Test results are compared with that of each reference specimen which is not strengthened with GSP.

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AN EVALUATION ON THE EFFECTIVE FLEXURAL RIGIDITY OF RC SLABS STRENGTHENED WITH CFRP SHEET AND GSP PLATE

  • Shim Jae-Joong;Song Seul-Ki;Oh Min-Ho;Cui-Jie;Park Sun-Kyu
    • International conference on construction engineering and project management
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    • 2009.05a
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    • pp.1272-1277
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    • 2009
  • Since improved capacity for RC bridges has been required due to deterioration or increase in traffic, the deflection of cracked reinforced concrete slabs need to be reconsidered. Strengthening is known as the better way to improve capacity of bridges than reconstructing. In this paper, Fiber Reinforced Plastic (FRP) was introduced as one of the best strengthening methods for civil structures. The structures strengthened with FRPs can improve the strengthening capacity and serviceability. Therefore, CFRP sheet and Glass Fiber-Steel Composite Plate (GSP) in this research were used for strengthening slabs of RC bridges. Experimental data from the strengthening will be helpful to better understand the effect of the strengthening and effective flexural rigidity.

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Experimental Study on Flexural Behavior of RC Slab Strengthened by FRP Sheet and GSP (FRP 쉬트 및 GSP로 보강된 RC 슬래브의 휨거동에 관한 실험적 연구)

  • Ahn, Ki-Man;Kim, Kwang-Soo;Kim, Tae-Wan;Park, Sun-Kyu;Lee, Young-Jae
    • Proceedings of the Korea Concrete Institute Conference
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    • 2006.11a
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    • pp.185-188
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    • 2006
  • Recently, an improved capacity for RC bridges is required by their deterioration or necessary to carry traffic increase. Strengthening is known as a better way to improve capacity of bridges than reconstructing. Fiber Reinforced Plastics (FRP) is introduced as one of the best strengthening structures in this paper. It is also known as an economical improvement. Therefore, FRP sheet and Glass Fiber-Steel Composite Plate (GSP) in this research were used in strengthening slab of RC bridges. Experimental data from the strengthening will be helpful to better understand the slab behavior and an effect of the strengthening.

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Fracture behaviors of R/C Beam Strengthened with FRP- Rod and GSP (FRP-Rod와 GSP로 보강된 철근 콘크리트보의 파괴 거동)

  • Kim, Chung-Ho;Ko, Sin-Woong;Hwang, Yun-Hee
    • Proceedings of the Korea Concrete Institute Conference
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    • 2006.11a
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    • pp.181-184
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    • 2006
  • In this investigation, fracture mechanism of the pre-cracked beams strengthened with FRP-Rod and GSP(Glass Fiber-Steel Plate) were experimentally studied by the repeating load test according to the three different loading speeds. In the experiments, it was identified that pre-crack in the damaged beams led the significant fracture type of the strengthened beams and loading speed did not influence the behaviors of the fractures. On the other hand, strengthened beams by GSP have more large increasing effects of the strength comparing to beams strengthened with FRP-Rod, but they have a brittle behaviors in fracture.

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A Study on the Strengthening Effect of Reinforced Conctete BeamsFlexural Strengthening after Pre-loading (선가력 후 휨 보강한 RC보의 보강 효과에 관한 연구)

  • Kim, Jeong-Sup;Sin, Yong-Seok;Jo, Cheol-Hee;Kim, Kyoug-Ok
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.10 no.6
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    • pp.183-190
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    • 2006
  • From the result of this research above, it may be summed up as follows. As a summary of results from each experiment, as the test body reinforced with the carbon rods was embedded inside the concrete section and made it possible uniform movement, this study has shown that it had excellent characteristics in improving the flexural strength and ductility. Also, it was considered as the carbon-steel sheet composite plate was to exert the strength more if it would complement the adherence with the concrete.