The Experts below are selected from a list of 15546 Experts worldwide ranked by ideXlab platform

Brahim Benmokrane - One of the best experts on this subject based on the ideXlab platform.

  • axial load moment interaction diagram of circular concrete columns reinforced with cfrp bars and spirals experimental and theoretical investigations
    Journal of Composites for Construction, 2016
    Co-Authors: Abdeldayem Hadhood, Hamdy M Mohamed, Brahim Benmokrane
    Abstract:

    AbstractNorth America’s current design codes and guidelines allow the use of fiber–reinforced polymer (FRP) bars as the primary Reinforcement in concrete structures and provide design recommendations for using these bars. Because of a lack of experimental data, however, FRP bars have not been recommended for resisting Compression stresses as longitudinal Reinforcement in columns or Compression Reinforcement in flexural elements. This paper presents test results of an experimental program to investigate the structural performance of 10 full-scale circular concrete columns reinforced with carbon fiber–reinforced polymer (CFRP) bars and spirals subjected to combined axial Compression loads and bending moments. The test variables include different eccentricity-to-diameter ratios and two types of Reinforcement (CFRP and steel). The test results show that the CFRP- and steel-reinforced concrete columns behaved similarly up to their peak loads. The failure of the test specimens under different levels of eccentri...

Farid Abed - One of the best experts on this subject based on the ideXlab platform.

  • fiber reinforced polymers bars for Compression Reinforcement a promising alternative to steel bars
    Construction and Building Materials, 2019
    Co-Authors: Nouran Elmessalami, Ahmed El Refai, Farid Abed
    Abstract:

    Abstract Fiber-reinforced polymers (FRP) have been introduced as alternative Reinforcement for concrete members since decades. Nevertheless, current design codes prohibit the use of FRP bars as main Reinforcement in Compression members such as columns. Recently, several studies came into sight focusing on evaluating the compressive response of FRP-reinforced concrete (RC) columns. While many of these studies have praised the performance of FRP bars in RC columns, others conservatively neglected their contribution to the columns’ capacities. The objective of this study is to present a comprehensive literature review on FRP-reinforced columns in order to better understand their performance under various loading conditions. To do so, the authors collected and analyzed the results of more than 300 tests published in 43 different experimental and analytical studies in the scientific literature. The collected columns were classified according to their slenderness, loading regime, cross sections, concrete type, and Reinforcement. The design equations proposed by several authors to predict the load-carrying capacities of the tested columns were collected and assessed. The work presents a critical review of the existing research on FRP-reinforced columns, identifies gaps in knowledge, and outlines directions for future research. The analysis of the collected data and the accuracy of several design approaches in predicting the behavior of FRP-reinforced columns suggests that it is time for code authorities to recognize the use of FRP in Compression members.

John J Myers - One of the best experts on this subject based on the ideXlab platform.

  • finite element modeling of hybrid composite beam bridges in missouri
    Journal of Bridge Engineering, 2015
    Co-Authors: Mohamed A Aboelseoud, John J Myers
    Abstract:

    AbstractThree bridges were recently constructed in Missouri using a new type of hybrid composite beam (HCB) incorporated within traditional RC deck systems. These HCBs are comprised of three main subcomponents: a composite shell, Compression Reinforcement, and tension Reinforcement. The Compression Reinforcement is a self-consolidating concrete (SCC) arch that is tied at the ends by high-strength galvanized steel strands. The Compression and tension Reinforcements are encapsulated in a glass fiber–reinforced polymer (GFRP) box, and the voids are filled with polyisocyrunate (polyiso) foam. This unique configuration aims to optimize the structural performance of the HCB constituents, hence optimizing the overall performance of the beam. However, because of the novelty of the HCB, its structural behavior is not yet completely understood. Consequently, the finite-element (FE) modeling of this new type of beam is crucial for providing deeper insight into its structural behavior and validating the current desig...

M A Mansur - One of the best experts on this subject based on the ideXlab platform.

  • reinforced high strength concrete beams in flexure
    Aci Structural Journal, 2005
    Co-Authors: M A Rashid, M A Mansur
    Abstract:

    An important design issue is the ductility or the ability of a reinforced concrete (RC) member to deform at or near the ultimate load without significant strength loss. This article reports on a study of reinforced high-strength concrete (HSC) beams in flexure. The study included flexural test results generated on 16 reinforced concrete beams. Test parameters considered include concrete compressive strength, ratios of tensile and compressive Reinforcements, and spacing of lateral ties. The authors found that the current code provisions for serviceability requirements of maximum crack width and ultimate strength are adequate up to a concrete strength of approximately 130 MPa. The authors express concerns regarding the adequacy of current code provisions, however, for cracking moment and service load deflection. They show that stresses generated by shrinkage of concrete and the creep associated with it can significantly affect the cracking moment and service load deflection of reinforced HSC beams. The authors recommend that the ACI Code specification for maximum spacing of ties in RC flexural members need to be reduced to d/4, particularly at critical sections. This will prevent premature disintegration of the confined concrete core in the Compression zone due to buckling of Compression Reinforcement.

Rami Eid - One of the best experts on this subject based on the ideXlab platform.

  • upper limit to Compression Reinforcement ratio in flexural elements
    Journal of Structural Engineering-asce, 2001
    Co-Authors: Avraham N Dancygier, Rami Eid
    Abstract:

    The upper limit to the tension Reinforcement ratio in flexural RC members is based on the requirement that tension failure as well as sufficient rotation capacity are ensured at ultimate limit state. However, the provisions for the total amount of longitudinal Reinforcement ratio are not associated with any rational derivation. A quantitative measure to evaluate an upper limit to the Compression Reinforcement ratio ρ′max of flexural RC members is proposed. It is shown that a quantitative criterion to ρ′max can be derived from steel congestion and proficient-design considerations and from considerations that are related to the diagonal Compression bearing capacity. Parameters that affect this limit include the concrete and steel strengths, the beam's geometry (L/d ratio, cross section's dimensions, and concrete cover), the steel bars' diameter, and the moment-to-shear loading ratio (or the loading type). When shear loading is dominant, the limit to ρ′ is set by the diagonal Compression criterion, while in ...