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Eunsoo Choi - One of the best experts on this subject based on the ideXlab platform.

  • Flexural Capacity of fiber reinforced concrete with a consideration of concrete strength and fiber content
    Construction and Building Materials, 2017
    Co-Authors: Eunsoo Choi
    Abstract:

    Abstract An experimental study was performed to examine the effects of concrete strength and fiber content ratio on the Flexural Capacity of steel fiber-reinforced concrete. Three fiber volume fractions, 0.25, 0.375, and 0.5%, and three concrete compressive strengths, 25, 35, and 45 MPa, were designed for the experiments. The stress and deflection relationship, first peak and post-cracking strength, and energy absorption Capacity were evaluated with respect to the variance in the fiber volume fraction and concrete strength. The results showed that the equivalent Flexural strength ratio, which is determined from the first peak strength and energy absorption Capacity, increased with the increase in the fiber volume fraction but decreased with the increase in the concrete strength. Furthermore, the effects of the concrete strength and fiber content ratio are discussed in a steel fiber-reinforced concrete floor slab. The ultimate Flexural Capacity also required a consideration of the influence of the content ratio of steel fiber as well as the strength of cement composite matrix.

  • Experimental study of the reinforcement effect of macro-type high strength polypropylene on the Flexural Capacity of concrete
    Construction and Building Materials, 2016
    Co-Authors: Jong-han Lee, Eunsoo Choi, Baik-soon Cho, Yong-hyung Kim
    Abstract:

    Abstract In this paper, an experimental study was performed to examine the Flexural Capacity of concrete reinforced with macro-type high strength polypropylene fiber. Four fiber volume fractions, 0.25, 0.5, 0.75, and 1.0%, and three concrete compressive strengths, 30, 40, and 60 MPa, were involved to determine the effects of the high strength polypropylene fiber on the Flexural Capacity of fiber-reinforced concrete. The stress and deflection curves, residual strength, and energy absorption Capacity obtained from the experiment were used to investigate the Flexural Capacity of high strength polypropylene fiber-reinforced concrete, particularly in high strength concrete. High strength concrete reinforced with a 0.25% volume fraction of high strength polypropylene fiber showed a Flexural Capacity lower than normal strength concrete reinforced with the same volume fraction. The reinforcing effect of the high strength polypropylene fiber in the Flexural Capacity of high strength concrete was excellent at volume fractions more than 0.50%.

Weichen Xue - One of the best experts on this subject based on the ideXlab platform.

  • Design approach for Flexural Capacity of concrete T-beams with bonded prestressed and nonprestressed FRP reinforcements
    Composite Structures, 2018
    Co-Authors: Fei Peng, Weichen Xue
    Abstract:

    Abstract Concrete beams with prestressed and nonprestressed fiber-reinforced polymer (FRP) reinforcements are commonly employed in field applications. However, available Flexural strength design approaches mainly focus on rectangular concrete beams exclusively prestressed with FRP tendons. This paper, therefore, presents a simplified yet rational design approach for Flexural Capacity of concrete T-beams with bonded prestressed and nonprestressed FRP reinforcements. Firstly, a new transition region between tension- and compression- controlled sections was proposed in terms of ratio of provided-to-balanced reinforcement ( ρ e,b ρ e  ≤ 1.5 ρ e,b ) based on a statistical analysis of an experimental database of 83 beams. Afterwards, numerical sectional analysis procedure of tension-controlled sections was developed by using an accurate stress block to approximate the nonlinear compressive stress distribution in concrete. Based on a detailed parametric study of over 160,000 sections, simplifed design equations for Flexural Capacity of tension-controlled section is derived from multiple regression analyses. Then, design equations were presented for Flexural Capacity of compression-controlled sections. Finally, the performance of the proposed approach was evaluated by comparing their predictions with experimental results of the 83 beams.

  • design equations for Flexural Capacity of concrete beams reinforced with glass fiber reinforced polymer bars
    Journal of Composites for Construction, 2016
    Co-Authors: Weichen Xue, Fei Peng, Qiaowen Zheng
    Abstract:

    AbstractThe Flexural failure mode of concrete beams reinforced with glass fiber-reinforced polymer (GFRP) bars changes from GFRP rupture to concrete crushing as the reinforcement ratio increases. Due to the uncertainties of material strengths, assumptions made in analysis, and variations in locations of reinforcements and dimensions of sections, there is a transition region where both Flexural failure modes are possible. An iterative procedure is required when GFRP rupture governs the design. To avoid this iteration, the current American standard adopts a simplified but conservative procedure. In this study, the upper bound of the reinforcement ratio for beams in the transition region is revised. Moreover, a simplified yet rational design equation for calculating the Flexural Capacity of under-reinforced beams is proposed based on rigorous sectional analyses. Also, alternative design equations based on regression analyses are developed to predict the Flexural Capacity of beams in the transition region and...

  • Design Equations for Flexural Capacity of Concrete Beams Reinforced with Glass Fiber–Reinforced Polymer Bars
    Journal of Composites for Construction, 2016
    Co-Authors: Weichen Xue, Fei Peng, Qiaowen Zheng
    Abstract:

    AbstractThe Flexural failure mode of concrete beams reinforced with glass fiber-reinforced polymer (GFRP) bars changes from GFRP rupture to concrete crushing as the reinforcement ratio increases. Due to the uncertainties of material strengths, assumptions made in analysis, and variations in locations of reinforcements and dimensions of sections, there is a transition region where both Flexural failure modes are possible. An iterative procedure is required when GFRP rupture governs the design. To avoid this iteration, the current American standard adopts a simplified but conservative procedure. In this study, the upper bound of the reinforcement ratio for beams in the transition region is revised. Moreover, a simplified yet rational design equation for calculating the Flexural Capacity of under-reinforced beams is proposed based on rigorous sectional analyses. Also, alternative design equations based on regression analyses are developed to predict the Flexural Capacity of beams in the transition region and...

Qiaowen Zheng - One of the best experts on this subject based on the ideXlab platform.

  • design equations for Flexural Capacity of concrete beams reinforced with glass fiber reinforced polymer bars
    Journal of Composites for Construction, 2016
    Co-Authors: Weichen Xue, Fei Peng, Qiaowen Zheng
    Abstract:

    AbstractThe Flexural failure mode of concrete beams reinforced with glass fiber-reinforced polymer (GFRP) bars changes from GFRP rupture to concrete crushing as the reinforcement ratio increases. Due to the uncertainties of material strengths, assumptions made in analysis, and variations in locations of reinforcements and dimensions of sections, there is a transition region where both Flexural failure modes are possible. An iterative procedure is required when GFRP rupture governs the design. To avoid this iteration, the current American standard adopts a simplified but conservative procedure. In this study, the upper bound of the reinforcement ratio for beams in the transition region is revised. Moreover, a simplified yet rational design equation for calculating the Flexural Capacity of under-reinforced beams is proposed based on rigorous sectional analyses. Also, alternative design equations based on regression analyses are developed to predict the Flexural Capacity of beams in the transition region and...

  • Design Equations for Flexural Capacity of Concrete Beams Reinforced with Glass Fiber–Reinforced Polymer Bars
    Journal of Composites for Construction, 2016
    Co-Authors: Weichen Xue, Fei Peng, Qiaowen Zheng
    Abstract:

    AbstractThe Flexural failure mode of concrete beams reinforced with glass fiber-reinforced polymer (GFRP) bars changes from GFRP rupture to concrete crushing as the reinforcement ratio increases. Due to the uncertainties of material strengths, assumptions made in analysis, and variations in locations of reinforcements and dimensions of sections, there is a transition region where both Flexural failure modes are possible. An iterative procedure is required when GFRP rupture governs the design. To avoid this iteration, the current American standard adopts a simplified but conservative procedure. In this study, the upper bound of the reinforcement ratio for beams in the transition region is revised. Moreover, a simplified yet rational design equation for calculating the Flexural Capacity of under-reinforced beams is proposed based on rigorous sectional analyses. Also, alternative design equations based on regression analyses are developed to predict the Flexural Capacity of beams in the transition region and...

Fei Peng - One of the best experts on this subject based on the ideXlab platform.

  • Design approach for Flexural Capacity of concrete T-beams with bonded prestressed and nonprestressed FRP reinforcements
    Composite Structures, 2018
    Co-Authors: Fei Peng, Weichen Xue
    Abstract:

    Abstract Concrete beams with prestressed and nonprestressed fiber-reinforced polymer (FRP) reinforcements are commonly employed in field applications. However, available Flexural strength design approaches mainly focus on rectangular concrete beams exclusively prestressed with FRP tendons. This paper, therefore, presents a simplified yet rational design approach for Flexural Capacity of concrete T-beams with bonded prestressed and nonprestressed FRP reinforcements. Firstly, a new transition region between tension- and compression- controlled sections was proposed in terms of ratio of provided-to-balanced reinforcement ( ρ e,b ρ e  ≤ 1.5 ρ e,b ) based on a statistical analysis of an experimental database of 83 beams. Afterwards, numerical sectional analysis procedure of tension-controlled sections was developed by using an accurate stress block to approximate the nonlinear compressive stress distribution in concrete. Based on a detailed parametric study of over 160,000 sections, simplifed design equations for Flexural Capacity of tension-controlled section is derived from multiple regression analyses. Then, design equations were presented for Flexural Capacity of compression-controlled sections. Finally, the performance of the proposed approach was evaluated by comparing their predictions with experimental results of the 83 beams.

  • design equations for Flexural Capacity of concrete beams reinforced with glass fiber reinforced polymer bars
    Journal of Composites for Construction, 2016
    Co-Authors: Weichen Xue, Fei Peng, Qiaowen Zheng
    Abstract:

    AbstractThe Flexural failure mode of concrete beams reinforced with glass fiber-reinforced polymer (GFRP) bars changes from GFRP rupture to concrete crushing as the reinforcement ratio increases. Due to the uncertainties of material strengths, assumptions made in analysis, and variations in locations of reinforcements and dimensions of sections, there is a transition region where both Flexural failure modes are possible. An iterative procedure is required when GFRP rupture governs the design. To avoid this iteration, the current American standard adopts a simplified but conservative procedure. In this study, the upper bound of the reinforcement ratio for beams in the transition region is revised. Moreover, a simplified yet rational design equation for calculating the Flexural Capacity of under-reinforced beams is proposed based on rigorous sectional analyses. Also, alternative design equations based on regression analyses are developed to predict the Flexural Capacity of beams in the transition region and...

  • Design Equations for Flexural Capacity of Concrete Beams Reinforced with Glass Fiber–Reinforced Polymer Bars
    Journal of Composites for Construction, 2016
    Co-Authors: Weichen Xue, Fei Peng, Qiaowen Zheng
    Abstract:

    AbstractThe Flexural failure mode of concrete beams reinforced with glass fiber-reinforced polymer (GFRP) bars changes from GFRP rupture to concrete crushing as the reinforcement ratio increases. Due to the uncertainties of material strengths, assumptions made in analysis, and variations in locations of reinforcements and dimensions of sections, there is a transition region where both Flexural failure modes are possible. An iterative procedure is required when GFRP rupture governs the design. To avoid this iteration, the current American standard adopts a simplified but conservative procedure. In this study, the upper bound of the reinforcement ratio for beams in the transition region is revised. Moreover, a simplified yet rational design equation for calculating the Flexural Capacity of under-reinforced beams is proposed based on rigorous sectional analyses. Also, alternative design equations based on regression analyses are developed to predict the Flexural Capacity of beams in the transition region and...

C.s. Cai - One of the best experts on this subject based on the ideXlab platform.

  • A Probabilistic Model for the Flexural Capacity of Reinforced Concrete Structures Strengthened with Prestressed CFRP Plates
    Advances in Structural Engineering, 2015
    Co-Authors: Yang Liu, Hui Peng, C.s. Cai
    Abstract:

    Strengthening concrete structures with prestressed carbon fiber reinforced polymer (CFRP) materials has gained popularity in recent years due to its ability to efficiently utilize the material's strength. However, the reliability of structures strengthened with prestressed CFRP laminates is a key issue. In this paper the statistical characteristics of design variables of reinforced concrete beams strengthened with prestressed CFRP plates are assessed. Accounting for the gradient effects, the Weibull distribution is used to describe the probability distribution function of the size and stress. The loss of prestressing force is analyzed considering the prestressing method. The probabilistic models of the Flexural Capacity are established for the three failure models, and the influence of variables on the Flexural Capacity is also studied. The probabilistic model derived in this paper can be used as the theoretical basis of reliability analysis and safety assessment of structures strengthened with CFRP mater...

  • seismic behavior of composite connections Flexural Capacity analysis
    Journal of Constructional Steel Research, 2009
    Co-Authors: Jian-guo Nie, Kai Qin, C.s. Cai
    Abstract:

    Abstract Based on the experimental results of connections composed of concrete-filled square steel tubular columns and steel–concrete composite beams with interior diaphragms or anchored studs, the Flexural Capacity of connections is studied theoretically in the present paper. Analytical models are proposed, with consideration of the effects of axial load, concrete slab, middle interior diaphragm, beam and column width condition, and punching shear failure mode. Formulae in different conditions are established based on these models. The predictions and the test results are compared and they are in good agreement.

  • Seismic behavior of composite connections — Flexural Capacity analysis
    Journal of Constructional Steel Research, 2009
    Co-Authors: Jian-guo Nie, Kai Qin, C.s. Cai
    Abstract:

    Abstract Based on the experimental results of connections composed of concrete-filled square steel tubular columns and steel–concrete composite beams with interior diaphragms or anchored studs, the Flexural Capacity of connections is studied theoretically in the present paper. Analytical models are proposed, with consideration of the effects of axial load, concrete slab, middle interior diaphragm, beam and column width condition, and punching shear failure mode. Formulae in different conditions are established based on these models. The predictions and the test results are compared and they are in good agreement.