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Lijun Hou - One of the best experts on this subject based on the ideXlab platform.

  • corrosion behavior and flexural performance of reinforced Concrete ultrahigh toughness cementitious composite rc uhtcc beams under sustained loading and shrinkage cracking
    Construction and Building Materials, 2019
    Co-Authors: Bingxuan Zhou, Lijun Hou, Shang Guo, Farhad Aslani, Da Chen
    Abstract:

    Abstract This paper presents an experimental study of the corrosion behavior of reinforced Concrete/ultrahigh toughness cementitious composite (RC/UHTCC) beams under simultaneous loading and shrinkage cracking, and of the flexural performance of these beams after corrosion. During corrosion, a two-stage corrosion test was applied – wet/dry cycles of chloride solution first and then accelerated corrosion using impressed current. Corrosion potential in the first corrosion stage and corrosion electrical resistance and corrosion pattern in the accelerated corrosion stage were measured, and rebar corrosion appearance was observed after bending tests. The results indicated that the corrosion potential decreased rapidly after exposure to chloride solution while the corrosion electrical resistance increased with corrosion time. No corrosion-induced longitudinal cracks occurred at corrosion levels up to 16.32%, but severe pitting corrosion of reinforcement was observed at transverse cracks. The load-carrying capacity, deformation, ductility, and flexural crack pattern of corroded RC/UHTCC beams were degraded greatly due to pitting corrosion effect. Ductile Concrete Crushing failure mode was transformed to brittle rebar rupture failure mode. The sustained loading action further aggravated the degradation in flexural capacity of corroded RC/UHTCC beams.

Da Chen - One of the best experts on this subject based on the ideXlab platform.

  • corrosion behavior and flexural performance of reinforced Concrete ultrahigh toughness cementitious composite rc uhtcc beams under sustained loading and shrinkage cracking
    Construction and Building Materials, 2019
    Co-Authors: Bingxuan Zhou, Lijun Hou, Shang Guo, Farhad Aslani, Da Chen
    Abstract:

    Abstract This paper presents an experimental study of the corrosion behavior of reinforced Concrete/ultrahigh toughness cementitious composite (RC/UHTCC) beams under simultaneous loading and shrinkage cracking, and of the flexural performance of these beams after corrosion. During corrosion, a two-stage corrosion test was applied – wet/dry cycles of chloride solution first and then accelerated corrosion using impressed current. Corrosion potential in the first corrosion stage and corrosion electrical resistance and corrosion pattern in the accelerated corrosion stage were measured, and rebar corrosion appearance was observed after bending tests. The results indicated that the corrosion potential decreased rapidly after exposure to chloride solution while the corrosion electrical resistance increased with corrosion time. No corrosion-induced longitudinal cracks occurred at corrosion levels up to 16.32%, but severe pitting corrosion of reinforcement was observed at transverse cracks. The load-carrying capacity, deformation, ductility, and flexural crack pattern of corroded RC/UHTCC beams were degraded greatly due to pitting corrosion effect. Ductile Concrete Crushing failure mode was transformed to brittle rebar rupture failure mode. The sustained loading action further aggravated the degradation in flexural capacity of corroded RC/UHTCC beams.

  • Corrosion behavior and flexural performance of reinforced Concrete/ultrahigh toughness cementitious composite (RC/UHTCC) beams under sustained loading and shrinkage cracking
    'Elsevier BV', 2019
    Co-Authors: Hou Lijun, Zhou Bingxuan, Guo Shang, Aslani Farhad, Da Chen
    Abstract:

    This paper presents an experimental study of the corrosion behavior of reinforced Concrete/ultrahigh toughness cementitious composite (RC/UHTCC) beams under simultaneous loading and shrinkage cracking, and of the flexural performance of these beams after corrosion. During corrosion, a two-stage corrosion test was applied – wet/dry cycles of chloride solution first and then accelerated corrosion using impressed current. Corrosion potential in the first corrosion stage and corrosion electrical resistance and corrosion pattern in the accelerated corrosion stage were measured, and rebar corrosion appearance was observed after bending tests. The results indicated that the corrosion potential decreased rapidly after exposure to chloride solution while the corrosion electrical resistance increased with corrosion time. No corrosion-induced longitudinal cracks occurred at corrosion levels up to 16.32%, but severe pitting corrosion of reinforcement was observed at transverse cracks. The load-carrying capacity, deformation, ductility, and flexural crack pattern of corroded RC/UHTCC beams were degraded greatly due to pitting corrosion effect. Ductile Concrete Crushing failure mode was transformed to brittle rebar rupture failure mode. The sustained loading action further aggravated the degradation in flexural capacity of corroded RC/UHTCC beams

Thanasis Triantafillou - One of the best experts on this subject based on the ideXlab platform.

  • analysis of frp strengthened rc beam column joints
    Journal of Composites for Construction, 2002
    Co-Authors: Costas P Antonopoulos, Thanasis Triantafillou
    Abstract:

    Analytical models are presented in this study for the analysis of reinforced Concrete joints strengthened with composite materials in the form of externally bonded reinforcement comprising unidirectional strips or flexible fabrics. The models provide equations for stresses and strains at various stages of the response (before or after yielding of the beam or column reinforcement) until the ultimate capacity is reached, defined by Concrete Crushing or fiber-reinforced polymer (FRP) failure due to fracture or debonding. Solutions to these equations are obtained numerically. The models provide useful information on the shear capacity of FRP-strengthened joints in terms of the quantity and configuration of the externally bonded reinforcement and may be used to design FRP patching for inadequately detailed beam-column joints. A number of case studies are examined in this article, indicating that even low quantities of FRP materials may provide significant enhancement of the shear capacity. The effectiveness of external reinforcement increases considerably if debonding is suppressed and depends heavily on the distribution of layers in the beam and column. The latter depends on the relative quantities of steel reinforcement crossing the joint panel and the level of axial load in the column. Analytical shear strength predictions were in good agreement with test results found in the literature, thus adding confidence to the validity of the proposed models.

  • analysis of frp strengthened rc beam column joints
    FRP Composites in Civil Engineering. Proceedings of the International Conference on FRP composites in Civil EngineeringHong Kong Institution of Engine, 2001
    Co-Authors: Costas P Antonopoulos, Thanasis Triantafillou
    Abstract:

    The study presents analytical models for the analysis of RC (reinforced Concrete) joints strengthened with composite materials. These models can provide equations for stresses and strains at various stages of the response until the ultimate capacity is reached, defined by Concrete Crushing of FRP (fiber reinforced polymer) failure due to fracture or debonding; solutions to the equations are obtained numerically. Useful information is provided by the models on the shear capacity of FRP-strengthened joints in terms of the quantity and configuration of the externally bonded reinforcement and may be used to design FRP jackets for poorly detailed beam-column joints. The paper illustrates the analytical procedure through a case study, and compares the analytical model with a series of test results and the agreement between theory and experiments is found satisfactory.

  • strengthening of rc beams with epoxy bonded fibre composite materials
    Materials and Structures, 1992
    Co-Authors: Thanasis Triantafillou, Nikolaos Plevris
    Abstract:

    Strengthening of Concrete beams with externally bonded fibre-reinforced plastic (FRP) materials appears to be a feasible way of increasing the load-carrying capacity and stiffness characteristics of existing structures. FRP-strengthened Concrete beams can fail in several ways when loaded in bending. The following collapse mechanisms are identified and analysed in this study: steel yield-FRP rupture, steel yield-Concrete Crushing, compressive failure, and debonding. Here we obtain equations describing each failure mechanism using the strain compatibility method, concepts of fracture mechanics and a simple model for the FRP peeling-off debonding mechanism due to the development of shear cracks. We then produce diagrams showing the beam designs for which each failure mechanism is dominant, examine the effect of FRP sheets on the ductility and stiffness of strengthened components, and give results of four-point bending tests confirming our analysis. The analytical results obtained can be used in establishing an FRP selection procedure for external strengthening of reinforced Concrete members with lightweight and durable materials.

Farhad Aslani - One of the best experts on this subject based on the ideXlab platform.

  • corrosion behavior and flexural performance of reinforced Concrete ultrahigh toughness cementitious composite rc uhtcc beams under sustained loading and shrinkage cracking
    Construction and Building Materials, 2019
    Co-Authors: Bingxuan Zhou, Lijun Hou, Shang Guo, Farhad Aslani, Da Chen
    Abstract:

    Abstract This paper presents an experimental study of the corrosion behavior of reinforced Concrete/ultrahigh toughness cementitious composite (RC/UHTCC) beams under simultaneous loading and shrinkage cracking, and of the flexural performance of these beams after corrosion. During corrosion, a two-stage corrosion test was applied – wet/dry cycles of chloride solution first and then accelerated corrosion using impressed current. Corrosion potential in the first corrosion stage and corrosion electrical resistance and corrosion pattern in the accelerated corrosion stage were measured, and rebar corrosion appearance was observed after bending tests. The results indicated that the corrosion potential decreased rapidly after exposure to chloride solution while the corrosion electrical resistance increased with corrosion time. No corrosion-induced longitudinal cracks occurred at corrosion levels up to 16.32%, but severe pitting corrosion of reinforcement was observed at transverse cracks. The load-carrying capacity, deformation, ductility, and flexural crack pattern of corroded RC/UHTCC beams were degraded greatly due to pitting corrosion effect. Ductile Concrete Crushing failure mode was transformed to brittle rebar rupture failure mode. The sustained loading action further aggravated the degradation in flexural capacity of corroded RC/UHTCC beams.

Costas P Antonopoulos - One of the best experts on this subject based on the ideXlab platform.

  • analysis of frp strengthened rc beam column joints
    Journal of Composites for Construction, 2002
    Co-Authors: Costas P Antonopoulos, Thanasis Triantafillou
    Abstract:

    Analytical models are presented in this study for the analysis of reinforced Concrete joints strengthened with composite materials in the form of externally bonded reinforcement comprising unidirectional strips or flexible fabrics. The models provide equations for stresses and strains at various stages of the response (before or after yielding of the beam or column reinforcement) until the ultimate capacity is reached, defined by Concrete Crushing or fiber-reinforced polymer (FRP) failure due to fracture or debonding. Solutions to these equations are obtained numerically. The models provide useful information on the shear capacity of FRP-strengthened joints in terms of the quantity and configuration of the externally bonded reinforcement and may be used to design FRP patching for inadequately detailed beam-column joints. A number of case studies are examined in this article, indicating that even low quantities of FRP materials may provide significant enhancement of the shear capacity. The effectiveness of external reinforcement increases considerably if debonding is suppressed and depends heavily on the distribution of layers in the beam and column. The latter depends on the relative quantities of steel reinforcement crossing the joint panel and the level of axial load in the column. Analytical shear strength predictions were in good agreement with test results found in the literature, thus adding confidence to the validity of the proposed models.

  • analysis of frp strengthened rc beam column joints
    FRP Composites in Civil Engineering. Proceedings of the International Conference on FRP composites in Civil EngineeringHong Kong Institution of Engine, 2001
    Co-Authors: Costas P Antonopoulos, Thanasis Triantafillou
    Abstract:

    The study presents analytical models for the analysis of RC (reinforced Concrete) joints strengthened with composite materials. These models can provide equations for stresses and strains at various stages of the response until the ultimate capacity is reached, defined by Concrete Crushing of FRP (fiber reinforced polymer) failure due to fracture or debonding; solutions to the equations are obtained numerically. Useful information is provided by the models on the shear capacity of FRP-strengthened joints in terms of the quantity and configuration of the externally bonded reinforcement and may be used to design FRP jackets for poorly detailed beam-column joints. The paper illustrates the analytical procedure through a case study, and compares the analytical model with a series of test results and the agreement between theory and experiments is found satisfactory.