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R. Frank - One of the best experts on this subject based on the ideXlab platform.

  • INFLUENCE OF THE ANISOTROPY OF Confining Stress ON THE SAND/STEEL INTERFACE BEHAVIOUR IN A CYLINDER SHEAR APPARATUS
    Soils and Foundations, 2009
    Co-Authors: A. I. Dumitrescu, Alain Corfdir, R. Frank
    Abstract:

    According to the type of works and to the consolidation of the ground, soil-structure interfaces are orientated in various ways with respect to the Stress tensor in the soil. For instance, before shearing, the normal Stress applied to the interface could be the major Stress in the soil or the minor one or some intermediate value. This paper shows how the anisotropy of Confining Stresses can influence the behaviour of sand/steel interface. To this end, a series of tests was conducted with the cylinder shear apparatus. The cylinder shear apparatus is dedicated to the study of the shear behaviour of ground/structure interfaces. This device controls the radial Confining Stress and an average axial Confining Stress. One is particularly interested in estimating the influence of anisotropy of Confining Stresses and to look for empirical laws clarifying this influence on the peak shear, the post-peak shear, the displacement needed for full mobilization. The influences of the roughness of the interface, of the density of the sample and of the level of Confining Stresses are also studied.

  • Influence of the anisotropy of Confining Stress on the sand / steel interface behaviour in a cylinder shear apparatus
    Soils and Foundations, 2009
    Co-Authors: A. I. Dumitrescu, Alain Corfdir, R. Frank
    Abstract:

    According to the type of works and to the consolidation of the ground, soil-structure interfaces are orientated in various ways with respect to the Stress tensor in the soil. For instance, before shearing, the normal Stress applied to the interface could be the major Stress in the soil or the minor one or some intermediate value. This paper shows how the anisotropy of Confining Stresses can influence the behaviour of sand/steel interface. To this end, a series of tests was conducted with the cylinder shear apparatus. The cylinder shear apparatus is dedicated to the study of the shear behaviour of ground/structure interfaces. This device controls the radial Confining Stress and an average axial Confining Stress. One is particularly interested in estimating the influence of anisotropy of Confining Stresses and to look for empirical laws clarifying this influence on the peak shear, the post-peak shear, the displacement needed for full mobilization. The influences of the roughness of the interface, of the density of the sample and of the level of Confining Stresses are also studied

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

  • INFLUENCE OF THE ANISOTROPY OF Confining Stress ON THE SAND/STEEL INTERFACE BEHAVIOUR IN A CYLINDER SHEAR APPARATUS
    Soils and Foundations, 2009
    Co-Authors: A. I. Dumitrescu, Alain Corfdir, R. Frank
    Abstract:

    According to the type of works and to the consolidation of the ground, soil-structure interfaces are orientated in various ways with respect to the Stress tensor in the soil. For instance, before shearing, the normal Stress applied to the interface could be the major Stress in the soil or the minor one or some intermediate value. This paper shows how the anisotropy of Confining Stresses can influence the behaviour of sand/steel interface. To this end, a series of tests was conducted with the cylinder shear apparatus. The cylinder shear apparatus is dedicated to the study of the shear behaviour of ground/structure interfaces. This device controls the radial Confining Stress and an average axial Confining Stress. One is particularly interested in estimating the influence of anisotropy of Confining Stresses and to look for empirical laws clarifying this influence on the peak shear, the post-peak shear, the displacement needed for full mobilization. The influences of the roughness of the interface, of the density of the sample and of the level of Confining Stresses are also studied.

  • Influence of the anisotropy of Confining Stress on the sand / steel interface behaviour in a cylinder shear apparatus
    Soils and Foundations, 2009
    Co-Authors: A. I. Dumitrescu, Alain Corfdir, R. Frank
    Abstract:

    According to the type of works and to the consolidation of the ground, soil-structure interfaces are orientated in various ways with respect to the Stress tensor in the soil. For instance, before shearing, the normal Stress applied to the interface could be the major Stress in the soil or the minor one or some intermediate value. This paper shows how the anisotropy of Confining Stresses can influence the behaviour of sand/steel interface. To this end, a series of tests was conducted with the cylinder shear apparatus. The cylinder shear apparatus is dedicated to the study of the shear behaviour of ground/structure interfaces. This device controls the radial Confining Stress and an average axial Confining Stress. One is particularly interested in estimating the influence of anisotropy of Confining Stresses and to look for empirical laws clarifying this influence on the peak shear, the post-peak shear, the displacement needed for full mobilization. The influences of the roughness of the interface, of the density of the sample and of the level of Confining Stresses are also studied

Michael F Riemer - One of the best experts on this subject based on the ideXlab platform.

  • drained response of municipal solid waste in large scale triaxial shear testing
    Waste Management, 2012
    Co-Authors: Dimitrios Zekkos, Jonathan D Bray, Michael F Riemer
    Abstract:

    A comprehensive laboratory investigation was performed on municipal solid waste (MSW) from a landfill located in northern California using a large-scale triaxial (TX) apparatus. An improved, standardized waste specimen preparation method was developed and used to prepare 27 large-scale TX specimens (d = 300 mm, h = 600–630 mm). The effects of waste composition, Confining Stress, unit weight, loading rate, and Stress path on the drained Stress–strain response of MSW were investigated. Waste composition has a significant effect on its Stress–strain response. The commonly observed upward curvature of the Stress–strain response of specimens composed of larger-sized waste materials results from the fibrous constituents (primarily paper, plastic and wood) reinforcing the waste matrix. This effect is greatest when the MSW specimen is sheared across the long axis of the fibrous particles. Due to this significant strain hardening effect and waste’s in situ Stress state, a limiting strain failure criterion of 5% axial strain from the Ko field consolidation state is judged to be most appropriate. Results from this test program and data from the literature indicate that the TX compression secant friction angle of MSW varies from 34° to 44°, with 39° as a best estimate, at a Confining Stress of one atmosphere (assuming c = 0). The friction angle decreases as Confining Stress increases. The friction angles measured in this testing program are representative of failure surfaces that are oriented at an angle to the predominant orientation of the long axis of the fibrous waste particles. These friction angles are higher than those obtained in direct shear tests where shearing typically occurs parallel to the orientation of the fibrous waste particles.

  • shear modulus and material damping of municipal solid waste based on large scale cyclic triaxial testing
    Canadian Geotechnical Journal, 2008
    Co-Authors: Dimitrios Zekkos, Jonathan D Bray, Michael F Riemer
    Abstract:

    Representative dynamic properties of municipal solid waste (MSW) are required to perform reliable seismic analyses of MSW landfills. A comprehensive large-scale cyclic triaxial laboratory testing program was performed on MSW retrieved from a landfill in the San Francisco Bay area to evaluate the small-strain shear modulus, and strain-dependent normalized shear modulus reduction and material damping ratio relationships of MSW. The effects of waste composi- tion, Confining Stress, unit weight, time under confinement, and loading frequency on these dynamic properties were evaluated. The small-strain shear modulus depends primarily on waste composition, Confining Stress, unit weight, and time under confinement. The normalized shear modulus reduction and material damping curves for MSW depend on waste composition and Confining Stress. Based on the results of this study and a review of literature, strain-dependent shear modulus reduction and material damping relationships are recommended for use in landfill design.

Alain Corfdir - One of the best experts on this subject based on the ideXlab platform.

  • INFLUENCE OF THE ANISOTROPY OF Confining Stress ON THE SAND/STEEL INTERFACE BEHAVIOUR IN A CYLINDER SHEAR APPARATUS
    Soils and Foundations, 2009
    Co-Authors: A. I. Dumitrescu, Alain Corfdir, R. Frank
    Abstract:

    According to the type of works and to the consolidation of the ground, soil-structure interfaces are orientated in various ways with respect to the Stress tensor in the soil. For instance, before shearing, the normal Stress applied to the interface could be the major Stress in the soil or the minor one or some intermediate value. This paper shows how the anisotropy of Confining Stresses can influence the behaviour of sand/steel interface. To this end, a series of tests was conducted with the cylinder shear apparatus. The cylinder shear apparatus is dedicated to the study of the shear behaviour of ground/structure interfaces. This device controls the radial Confining Stress and an average axial Confining Stress. One is particularly interested in estimating the influence of anisotropy of Confining Stresses and to look for empirical laws clarifying this influence on the peak shear, the post-peak shear, the displacement needed for full mobilization. The influences of the roughness of the interface, of the density of the sample and of the level of Confining Stresses are also studied.

  • Influence of the anisotropy of Confining Stress on the sand / steel interface behaviour in a cylinder shear apparatus
    Soils and Foundations, 2009
    Co-Authors: A. I. Dumitrescu, Alain Corfdir, R. Frank
    Abstract:

    According to the type of works and to the consolidation of the ground, soil-structure interfaces are orientated in various ways with respect to the Stress tensor in the soil. For instance, before shearing, the normal Stress applied to the interface could be the major Stress in the soil or the minor one or some intermediate value. This paper shows how the anisotropy of Confining Stresses can influence the behaviour of sand/steel interface. To this end, a series of tests was conducted with the cylinder shear apparatus. The cylinder shear apparatus is dedicated to the study of the shear behaviour of ground/structure interfaces. This device controls the radial Confining Stress and an average axial Confining Stress. One is particularly interested in estimating the influence of anisotropy of Confining Stresses and to look for empirical laws clarifying this influence on the peak shear, the post-peak shear, the displacement needed for full mobilization. The influences of the roughness of the interface, of the density of the sample and of the level of Confining Stresses are also studied

Yan-gang Zhao - One of the best experts on this subject based on the ideXlab platform.

  • Modified Confining Stress path dependent analytical model for axially loaded circular normal, high and ultra-high strength concrete-filled steel tube stub columns
    Composite Structures, 2020
    Co-Authors: Siqi Lin, Yan-gang Zhao
    Abstract:

    Abstract Previous studies suggested that the behaviors of confined concrete in concrete-filled steel tube (CFT) columns were dependent on their Confining Stress paths, which thus should be considered in order to well predict their behaviors. Several Confining Stress path dependent analytical models had been proposed, which, however, were all developed for fiber polymer (FRP) confined concretes. Although one of the existing models can also be applicable to CFT columns, it mainly focused on the specimens with normal strength concrete. Additionally, existing Confining Stress path dependent models may result in fluctuation issue of load-deflection curves for CFT specimens. This paper proposed a new Confining Stress path dependent analytical model that is applicable to normal, high and ultra-high strength concrete-filled steel tube columns. Experimental tests were collected to assess the performance of the proposed analytical model, and it was found that the proposed model performs quite well for normal, high and ultra-high strength concrete-filled steel tube columns and generally can avoid the fluctuation issue of load-deflection curves.