The Experts below are selected from a list of 1761 Experts worldwide ranked by ideXlab platform

George Ch Papadakis - One of the best experts on this subject based on the ideXlab platform.

  • diagonal Shear failure and size effect in rc beams without web reinforcement
    Journal of Structural Engineering-asce, 2001
    Co-Authors: Prodromos D Zararis, George Ch Papadakis
    Abstract:

    This paper describes a formal theory, which explains the mechanism of Shear failure in reinforced concrete (RC) ordinary (slender) beams without web reinforcement. The theory determines the type of splitting of concrete responsible for the diagonal Shear failure of beams under concentrated loads and the location along the Shear span where this splitting occurs. A simple expression is derived for the Shear stress at failure as the product of the ratio of the neutral axis depth to the effective depth of beam times the splitting tensile Strength of concrete. It is also shown how the Nominal Shear Strength can be adjusted to take into account the size effect. The derived formula from this analysis is verified by comparisons to extensive sets of experimental data from the literature, which have been obtained on slender beams with various Strengths of concrete (low and high), steel ratios, Shear span to depth (a/d) ratios, and geometrical sizes.

Wenying Zhang - One of the best experts on this subject based on the ideXlab platform.

  • behavior and design of thin walled cold formed steel clip angles subjected to Shear load
    Journal of Structural Engineering-asce, 2016
    Co-Authors: Mohamad Yousof, Mahsa Mahdavian, Wenying Zhang
    Abstract:

    AbstractThin-walled cold-formed steel (CFS) clip angles are commonly used to connect CFS framing members or attach CFS members to the main building structure. The design provisions for CFS clip angle connectors have not been included in the AISI design specifications and standards. This paper presents a research project aimed at developing a design method for the thin-walled cold-formed steel load bearing clip angles subjected to Shear forces. An extensive test program was conducted to investigate the behavior and Shear capacity of clip angles with various dimensions and thicknesses. It was found that the local buckling and the distortional buckling could dominate the failure mechanism dependent on the plate slenderness ratio. Based on the test results, two design methods were developed for determining the Nominal Shear Strength of load bearing clip angles with and without consideration of the clip deformation, respectively. The ASD safety factors and the LRFD resistance factor were also produced to suppo...

S Pampanin - One of the best experts on this subject based on the ideXlab platform.

  • assessment and design procedure for the seismic retrofit of reinforced concrete beam column joints using frp composite materials
    Journal of Composites for Construction, 2012
    Co-Authors: Umut Akguzel, S Pampanin
    Abstract:

    In this study, an analytical procedure for the evaluation of the expected performance of existing reinforced concrete (RC) beam-column joints before and after being retrofitted using fiber-reinforced polymer (FRP) composite materials is presented. Focus is given on the evaluation of the Shear-Strength versus deformation properties of the panel zone region either in the as-built or FRP-retrofitted configuration. Based on experimental and numerical evidence as well as on physical models representing the mechanics of the joint region, principal tensile stresses versus joint Shear deformation relationships are adopted and preferred to more traditional Nominal Shear-Strength rules, to evaluate, within a step-by-step iterative procedure, the combination of the joint Shear contribution provided by the FRP composite material and that provided by the concrete core alone. The use of principal stresses allows one to directly account for the effects of variation of axial load, typically neglected in the assessment and retrofit of beam-column joints. The hierarchy of Strength and sequence of events (damage mechanisms) expected within a beam-column subsystem are visualized via M-N interaction performance domains, used as a basis for a performance-based retrofit philosophy. Specific limit states or design objectives are targeted, with attention given to both Strength and deformation limits. The proposed analytical procedure is validated on the results of a set of experimental tests available in the literature. With the intention to provide a simple design tool that can be easily implemented by practicing engineers, a worked example for the evaluation of the expected performance of an FRP retrofitted beam-column joint is provided and used as a basis for a parametric study to illustrate the effects of different Strengthening schemes on the behavior of Strengthened exterior joint panels under various axial load levels.

Prodromos D Zararis - One of the best experts on this subject based on the ideXlab platform.

  • diagonal Shear failure and size effect in rc beams without web reinforcement
    Journal of Structural Engineering-asce, 2001
    Co-Authors: Prodromos D Zararis, George Ch Papadakis
    Abstract:

    This paper describes a formal theory, which explains the mechanism of Shear failure in reinforced concrete (RC) ordinary (slender) beams without web reinforcement. The theory determines the type of splitting of concrete responsible for the diagonal Shear failure of beams under concentrated loads and the location along the Shear span where this splitting occurs. A simple expression is derived for the Shear stress at failure as the product of the ratio of the neutral axis depth to the effective depth of beam times the splitting tensile Strength of concrete. It is also shown how the Nominal Shear Strength can be adjusted to take into account the size effect. The derived formula from this analysis is verified by comparisons to extensive sets of experimental data from the literature, which have been obtained on slender beams with various Strengths of concrete (low and high), steel ratios, Shear span to depth (a/d) ratios, and geometrical sizes.

Mohamad Yousof - One of the best experts on this subject based on the ideXlab platform.

  • behavior and design of thin walled cold formed steel clip angles subjected to Shear load
    Journal of Structural Engineering-asce, 2016
    Co-Authors: Mohamad Yousof, Mahsa Mahdavian, Wenying Zhang
    Abstract:

    AbstractThin-walled cold-formed steel (CFS) clip angles are commonly used to connect CFS framing members or attach CFS members to the main building structure. The design provisions for CFS clip angle connectors have not been included in the AISI design specifications and standards. This paper presents a research project aimed at developing a design method for the thin-walled cold-formed steel load bearing clip angles subjected to Shear forces. An extensive test program was conducted to investigate the behavior and Shear capacity of clip angles with various dimensions and thicknesses. It was found that the local buckling and the distortional buckling could dominate the failure mechanism dependent on the plate slenderness ratio. Based on the test results, two design methods were developed for determining the Nominal Shear Strength of load bearing clip angles with and without consideration of the clip deformation, respectively. The ASD safety factors and the LRFD resistance factor were also produced to suppo...