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Grace Hui Ying Chua - One of the best experts on this subject based on the ideXlab platform.

  • seismic performance of strengthened Reinforced Concrete Beam column joints using frp composites
    Journal of Structural Engineering-asce, 2009
    Co-Authors: Grace Hui Ying Chua
    Abstract:

    Three nonseismically detailed interior Reinforced Concrete Beam-column joints, namely, one eccentric and two concentric joints, strengthened with proposed fiber-Reinforced polymer (FRP) wrapping configurations using glass fiber-Reinforced polymer and carbon fiber-Reinforced polymer strips and sheets, were tested under constant axial compression load and reversed cyclic loading which simulated low to moderate earthquake forces. Seismic performance of the strengthened Beam-column joints in terms of their hysteresis response, stiffness, and energy dissipation capacity is evaluated and compared to those of the original and unstrengthened Beam-column joints. Results indicate that applying strips at 45o on a flushed eccentric joint core and as cross bracing on the Beam and confinement round the column is very effective. All specimens failed with gradual strength deterioration, bond degradation, and debonding of FRP sheets was observed near the joint core. The proposed strengthening schemes were found to be effi...

I Petrelazar - One of the best experts on this subject based on the ideXlab platform.

  • corrosion damage diagnosis of a Reinforced Concrete Beam after 40 years natural exposure in marine environment
    Cement and Concrete Research, 2006
    Co-Authors: O Poupard, V Lhostis, S Catinaud, I Petrelazar
    Abstract:

    Abstract A detailed investigation of the chloride induced corrosion damage was performed on a 40 years old Reinforced Concrete Beam exposed in marine environment. Visual observations, electrochemical measurements, carbonation depth, total chloride content were carried out. Half-cell potential measurements were used to locate corrosion areas. It appeared that the interpretation based on gradient of the potential was in good concordance with real state of damage. Complementary destructive methods are applied to observe the real corrosion state of steel rebars and characterize the corrosion products and the steel/Concrete interface (optical and electronical microscopy tools (XRD, SEM, EDS and μ-Raman). All these data indicate that on the Beam, one may distinguish two types of areas: “high-corrosion zones” and “low-corrosion zones.” Given the fact that the “high corrosion zones” were found to be close to corrosion induced cracks and that they have a different morphology, this contribution concludes that the position of these areas did not shift in time.

  • corrosion damage diagnosis of a Reinforced Concrete Beam after 40 years natural exposure in marine environment
    Cement and Concrete Research, 2006
    Co-Authors: O Poupard, V Lhostis, S Catinaud, I Petrelazar
    Abstract:

    Abstract A detailed investigation of the chloride induced corrosion damage was performed on a 40 years old Reinforced Concrete Beam exposed in marine environment. Visual observations, electrochemical measurements, carbonation depth, total chloride content were carried out. Half-cell potential measurements were used to locate corrosion areas. It appeared that the interpretation based on gradient of the potential was in good concordance with real state of damage. Complementary destructive methods are applied to observe the real corrosion state of steel rebars and characterize the corrosion products and the steel/Concrete interface (optical and electronical microscopy tools (XRD, SEM, EDS and μ-Raman). All these data indicate that on the Beam, one may distinguish two types of areas: “high-corrosion zones” and “low-corrosion zones.” Given the fact that the “high corrosion zones” were found to be close to corrosion induced cracks and that they have a different morphology, this contribution concludes that the position of these areas did not shift in time.

Halil Sezen - One of the best experts on this subject based on the ideXlab platform.

  • repair and strengthening of Reinforced Concrete Beam column joints with fiber Reinforced polymer composites
    Journal of Composites for Construction, 2012
    Co-Authors: Halil Sezen
    Abstract:

    Three exterior Reinforced Concrete Beam-column joint specimens were tested under reverse cyclic loading. The joint region of these specimens suffered significant damage, whereas limited damage was observed in the Beams. The damaged specimens were repaired and strengthened to prevent shear damage and strength deterioration inside the joint region and to achieve more ductile response. First, the damaged loose Concrete was removed and replaced by high-strength nonshrink mortar. Then, fiber-Reinforced polymer (FRP) strips were diagonally wrapped over the joint region, and longitudinal FRP strips were applied and anchored on the Beams. The original strength was restored in all strengthened specimens under the application of the same loading history. Deformation capacities of the strengthened specimens were much larger than those of the original specimens.

  • behavior of exterior Reinforced Concrete Beam column joints including a new reinforcement
    Structural Engineering and Mechanics, 2011
    Co-Authors: Matthew J Fisher, Halil Sezen
    Abstract:

    Six Reinforced Concrete Beam-column joint specimens were constructed and tested under reverse cyclic loading to failure. The six specimens were divided into three groups, each group representing a different joint design. The main objectives of this study are to investigate the response of joints with three different design, reinforcement detailing and Beam strengths, and to evaluate and compare the responses of Beam-column joints Reinforced with traditional steel rebar and a recently proposed steel reinforcement called prefabricated cage system (PCS). Each of the three test specimen designs included equivalent amount of steel reinforcement and had virtually identical details. The results of the research show that the PCS Reinforced joints had a slightly higher strength and significantly larger deformation capacity than the equivalent rebar Reinforced joints.

E Emami - One of the best experts on this subject based on the ideXlab platform.

  • cyclic performance of retrofitted Reinforced Concrete Beam column joints using steel prop
    Construction and Building Materials, 2012
    Co-Authors: Kazem M Sharbatdar, Ali Kheyroddin, E Emami
    Abstract:

    Abstract This paper investigates the cyclic experimental behavior of damaged exterior Reinforced Concrete Beam–column joint specimens retrofitted with the proposed technique using steel elements called steel prop and curb. The technique is usable for local and global strengthening of Reinforced Concrete frames. Four half-scale RC joints were tested under the cyclic loading; two control specimens with the different Beam heights were loaded up to their ultimate strength and this was followed by retrofitting of these damaged specimens as new specimens and tested again under the same loading system. Experimental results showed that the 25% reduction of Beam height due to construction mistake caused increasing in deflection of joint Beam, decreasing of ductility and also 33% and 26% decreasing in bearing capacity and energy absorption, respectively. The ultimate load was increased up to 80% and the rigidity decreased degradation of retrofitted damaged joints was significantly in the proposed retrofitting system. And also the energy absorption was enhanced and the cracks were minimized due to a new lateral loading in the Beam–column joint region in this upgrading method.

O Poupard - One of the best experts on this subject based on the ideXlab platform.

  • corrosion damage diagnosis of a Reinforced Concrete Beam after 40 years natural exposure in marine environment
    Cement and Concrete Research, 2006
    Co-Authors: O Poupard, V Lhostis, S Catinaud, I Petrelazar
    Abstract:

    Abstract A detailed investigation of the chloride induced corrosion damage was performed on a 40 years old Reinforced Concrete Beam exposed in marine environment. Visual observations, electrochemical measurements, carbonation depth, total chloride content were carried out. Half-cell potential measurements were used to locate corrosion areas. It appeared that the interpretation based on gradient of the potential was in good concordance with real state of damage. Complementary destructive methods are applied to observe the real corrosion state of steel rebars and characterize the corrosion products and the steel/Concrete interface (optical and electronical microscopy tools (XRD, SEM, EDS and μ-Raman). All these data indicate that on the Beam, one may distinguish two types of areas: “high-corrosion zones” and “low-corrosion zones.” Given the fact that the “high corrosion zones” were found to be close to corrosion induced cracks and that they have a different morphology, this contribution concludes that the position of these areas did not shift in time.

  • corrosion damage diagnosis of a Reinforced Concrete Beam after 40 years natural exposure in marine environment
    Cement and Concrete Research, 2006
    Co-Authors: O Poupard, V Lhostis, S Catinaud, I Petrelazar
    Abstract:

    Abstract A detailed investigation of the chloride induced corrosion damage was performed on a 40 years old Reinforced Concrete Beam exposed in marine environment. Visual observations, electrochemical measurements, carbonation depth, total chloride content were carried out. Half-cell potential measurements were used to locate corrosion areas. It appeared that the interpretation based on gradient of the potential was in good concordance with real state of damage. Complementary destructive methods are applied to observe the real corrosion state of steel rebars and characterize the corrosion products and the steel/Concrete interface (optical and electronical microscopy tools (XRD, SEM, EDS and μ-Raman). All these data indicate that on the Beam, one may distinguish two types of areas: “high-corrosion zones” and “low-corrosion zones.” Given the fact that the “high corrosion zones” were found to be close to corrosion induced cracks and that they have a different morphology, this contribution concludes that the position of these areas did not shift in time.