The Experts below are selected from a list of 213 Experts worldwide ranked by ideXlab platform

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

  • strength analysis of steel concrete composite beams in Combined Bending and shear
    Journal of Structural Engineering-asce, 2005
    Co-Authors: Qing Quan Liang, M.a. Bradford, Hamid R. Ronagh
    Abstract:

    Despite experimental evidences, the contributions of the concrete slab and composite action to the vertical shear strength of simply supported steel-concrete composite beams are not considered in current design codes, which lead to conservative designs. In this paper, the finite element method is used to investigate the flexural and shear strengths of simply supported composite beams under Combined Bending and shear. A three-dimensional finite element model has been developed to account for geometric and material nonlinear behavior of composite beams, and verified by experimental results. The verified finite element model is than employed to quantify the contributions of the concrete slab and composite action to the moment and shear capacities of composite beams. The effect of the degree of shear connection on the vertical shear strength of deep composite beams loaded in shear is studied. Design models for vertical shear strength including contributions from the concrete slab and composite action and for the ultimate moment-shear interaction ate proposed for the design of simply supported composite beams in Combined Bending and shear. The proposed design models provide a consistent and economical design procedure for simply supported composite beams.

  • Strength Analysis of Steel–Concrete Composite Beams in Combined Bending and Shear
    Journal of Structural Engineering, 2005
    Co-Authors: Qing Quan Liang, M.a. Bradford, Hamid R. Ronagh
    Abstract:

    Despite experimental evidences, the contributions of the concrete slab and composite action to the vertical shear strength of simply supported steel-concrete composite beams are not considered in current design codes, which lead to conservative designs. In this paper, the finite element method is used to investigate the flexural and shear strengths of simply supported composite beams under Combined Bending and shear. A three-dimensional finite element model has been developed to account for geometric and material nonlinear behavior of composite beams, and verified by experimental results. The verified finite element model is than employed to quantify the contributions of the concrete slab and composite action to the moment and shear capacities of composite beams. The effect of the degree of shear connection on the vertical shear strength of deep composite beams loaded in shear is studied. Design models for vertical shear strength including contributions from the concrete slab and composite action and for the ultimate moment-shear interaction ate proposed for the design of simply supported composite beams in Combined Bending and shear. The proposed design models provide a consistent and economical design procedure for simply supported composite beams.

  • ultimate strength of continuous composite beams in Combined Bending and shear
    Journal of Constructional Steel Research, 2004
    Co-Authors: Qing Quan Liang, M.a. Bradford, Hamid R. Ronagh
    Abstract:

    The contributions of the concrete slab and composite action to the vertical shear strength of continuous steel–concrete composite beams are ignored in current design codes, which result in conservative designs. This paper investigates the ultimate strength of continuous composite beams in Combined Bending and shear by using the finite element analysis method. A three-dimensional finite element model has been developed to account for the geometric and material nonlinear behaviour of continuous composite beams. The finite element model is verified by experimental results and then used to study the effects of the concrete slab and shear connection on the vertical shear strength. The moment–shear interaction strength of continuous composite beams is also investigated by varying the moment/shear ratio. It is shown that the concrete slab and composite action significantly increase the ultimate strength of continuous composite beams. Based on numerical results, design models are proposed for the vertical shear strength and moment–shear interaction of continuous composite beams. The proposed design models, which incorporates the effects of the concrete slab, composite action, stud pullout failure and web shear buckling, are compared with experimental results with good agreement.

  • Ultimate strength of composite beams in Combined Bending and shear
    2004
    Co-Authors: Hamid R. Ronagh, Qing Quan Liang, M.a. Bradford
    Abstract:

    This paper investigates the ultimate strength of simply supported and continuous composite beams in Combined Bending and vertical shear by using the finite element analysis method. Three-dimensional finite element models have been developed to account for the geometric and material nonlinear characteristics of composite beams. The finite element models are verified by experimental results and employed to study the effects of the concrete slab and the degree of shear connection on the vertical shear strength of composite beams. The moment-shear interaction strength of composite beams is also investigated by varying the moment/shear ratio. The nonlinear finite element analyses show that the concrete slab and composite action significantly increase the ultimate flexural and vertical shear strengths of simply supported and continuous composite beams. Based on numerical results, design models are proposed for the vertical shear strength and moment-shear interaction of composite beams. The proposed design models consider the effects of the concrete slab, composite action, stud pullout failure and web shear buckling on the ultimate strengths of composite beams, and provide economical designs of composite beams in comparison with current design codes.

Ben Young - One of the best experts on this subject based on the ideXlab platform.

  • Combined Bending and web crippling of aluminum SHS members
    Steel and Composite Structures, 2019
    Co-Authors: Feng Zhou, Ben Young
    Abstract:

    This paper presents experimental and numerical investigations of aluminum tubular members subjected to Combined Bending and web crippling. A series of tests was performed on square hollow sections (SHS) fabricated by extrusion using 6061-T6 heat-treated aluminum alloy. Different specimen lengths were tested to obtain the interaction relationship between moment and concentrated load. The non-linear finite element models were developed and verified against the experimental results obtained in this study and test data from existing literature for aluminum tubular sections subjected to pure Bending, pure web crippling, and Combined Bending and web crippling. Geometric and material non-linearities were included in the finite element models. The finite element models closely predicted the strengths and failure modes of the tested specimens. Hence, the models were used for an extensive parametric study of cross-section geometries, and the web slenderness values ranged from 6.0 to 86.2. The Combined Bending and web crippling test results and strengths predicted from the finite element analysis were compared with the design strengths obtained using the current American Specification, Australian/New Zealand Standard and European Code for aluminum structures. The findings suggest that the current specifications are either quite conservative or unconservative for aluminum square hollow sections subjected to Combined Bending and web crippling. Hence, a Bending and web crippling interaction equation for aluminum square hollow section specimens is proposed in this paper.

  • Cold-Formed High-Strength Steel Tubular Structural Members under Combined Bending and Bearing
    Journal of Structural Engineering, 2019
    Co-Authors: Ben Young
    Abstract:

    AbstractThis paper presents experimental and numerical investigations of cold-formed high-strength steel (CFHSS) tubular structural members under Combined Bending and bearing. A test program that c...

  • Analysis and design of cold-formed steel channels subjected to Combined Bending and web crippling
    Thin-Walled Structures, 2006
    Co-Authors: Wei-xin Ren, Sheng-en Fang, Ben Young
    Abstract:

    The channel failures due to Combined Bending and web crippling may occur at the highly concentrated interior loading when there is no load stiffener in cold-formed thin-walled steel beams. This paper presents accurate finite element models to predict the behavior and ultimate strengths of cold-formed steel channels subjected to pure Bending as well as Combined Bending and web crippling. Both geometric and material nonlinearities are considered in the finite element analysis. The nonlinear finite element models are verified against experimental results of cold-formed steel channels subjected to pure Bending as well as Combined Bending and web crippling. The finite element analytical results show a good agreement with the experimental results in terms of the ultimate loads and moments, failure modes and web load-deformation curves thus validating the accuracy of the finite element models. The verified finite element models are then used for an extensive parametric study of different channel dimensions. The channel strengths predicted from the parametric study are compared with the design strengths calculated from the North American Specification for cold-formed steel structures. It is shown that the design rules in the North American Specification are generally conservative for channel sections with unstiffened flanges having the web slenderness ranged from 7.8 to 108.5 subjected to Combined Bending and web crippling. It is demonstrated that the nonlinear finite element analysis by using the verified finite element models against test results is an effective way to predict the ultimate strengths of cold-formed thin-walled steel members.

  • Tests of Channels Subjected to Combined Bending and Web Crippling
    Journal of Structural Engineering, 2002
    Co-Authors: Ben Young, Gregory J. Hancock
    Abstract:

    An experimental investigation of cold-formed channels subjected to Combined Bending and web crippling is described in this paper. A series of tests was performed on unlipped channels rolled from high strength structural steel sheets having nominal plate thickness up to 6 mm, and a maximum web slenderness value of 45. This value is considerably lower than the intended web slenderness values used in the Australian/New Zealand Standard (AS/NZS 1996) and the American Iron and Steel Institute (AISI 1996) specification for cold-formed steel structures. Therefore, the appropriateness of the Combined Bending and web crippling design rules for members with comparatively stocky webs is investigated in this paper. The specimens were tested at various lengths using the Interior-One-Flange loading condition specified in the AS/NZS (1996) and the AISI (1996) specification, and the test strengths are compared with the design strengths obtained from these specifications. Generally, it is shown that the specifications conservatively predicted the strengths of unlipped channels having stocky webs subjected to Combined Bending and web crippling.

  • Experimental investigation of cold-formed channels subjected to Combined Bending and web crippling
    2000
    Co-Authors: Ben Young, Gregory J. Hancock
    Abstract:

    An experimental investigation of cold-formed channels subjected to Combined Bending and web crippling is described in this paper. A series of tests was performed on unlipped channels rolled from high strength structural steel sheets having nominal plate thickness up to 6 mm, and a maximum web slenderness value of 45. This value is considerably lower than the intended web slenderness values used in the AustralianlNew Zealand Standard (AS/NZS 4600, 1996) and the American Iron and Steel Institute (AISI, 1996) Specification for cold-formed steel structures. In the past, the typical thickness of cold-formed steel members was less than 3 mm, and this was due to the limitations of the cold-forming technology in the 1980s. The design rules in the AS/NZS 4600 and the AISI Specification for members subjected to Combined Bending and web crippling are mainly based on test results having plate thickness less than 3 mm with web slenderness values greater than 45. Therefore, the appropriateness of the design rules for members having plate thickness greater than 3 mm is investigated in this paper. The specimens were tested at various lengths using the Interior-One-Flange (lOF) loading condition specified in the AS/NZS 4600 and the AISI Specification. The test strengths are compared with the design strengths obtained using the AS/NZS 4600 and the AISI Specification. Generally, it is shown that the specifications conservatively predicted the strengths of the tested unlipped channels subjected to Combined Bending and web crippling.

Qing Quan Liang - One of the best experts on this subject based on the ideXlab platform.

  • strength analysis of steel concrete composite beams in Combined Bending and shear
    Journal of Structural Engineering-asce, 2005
    Co-Authors: Qing Quan Liang, M.a. Bradford, Hamid R. Ronagh
    Abstract:

    Despite experimental evidences, the contributions of the concrete slab and composite action to the vertical shear strength of simply supported steel-concrete composite beams are not considered in current design codes, which lead to conservative designs. In this paper, the finite element method is used to investigate the flexural and shear strengths of simply supported composite beams under Combined Bending and shear. A three-dimensional finite element model has been developed to account for geometric and material nonlinear behavior of composite beams, and verified by experimental results. The verified finite element model is than employed to quantify the contributions of the concrete slab and composite action to the moment and shear capacities of composite beams. The effect of the degree of shear connection on the vertical shear strength of deep composite beams loaded in shear is studied. Design models for vertical shear strength including contributions from the concrete slab and composite action and for the ultimate moment-shear interaction ate proposed for the design of simply supported composite beams in Combined Bending and shear. The proposed design models provide a consistent and economical design procedure for simply supported composite beams.

  • Strength Analysis of Steel–Concrete Composite Beams in Combined Bending and Shear
    Journal of Structural Engineering, 2005
    Co-Authors: Qing Quan Liang, M.a. Bradford, Hamid R. Ronagh
    Abstract:

    Despite experimental evidences, the contributions of the concrete slab and composite action to the vertical shear strength of simply supported steel-concrete composite beams are not considered in current design codes, which lead to conservative designs. In this paper, the finite element method is used to investigate the flexural and shear strengths of simply supported composite beams under Combined Bending and shear. A three-dimensional finite element model has been developed to account for geometric and material nonlinear behavior of composite beams, and verified by experimental results. The verified finite element model is than employed to quantify the contributions of the concrete slab and composite action to the moment and shear capacities of composite beams. The effect of the degree of shear connection on the vertical shear strength of deep composite beams loaded in shear is studied. Design models for vertical shear strength including contributions from the concrete slab and composite action and for the ultimate moment-shear interaction ate proposed for the design of simply supported composite beams in Combined Bending and shear. The proposed design models provide a consistent and economical design procedure for simply supported composite beams.

  • ultimate strength of continuous composite beams in Combined Bending and shear
    Journal of Constructional Steel Research, 2004
    Co-Authors: Qing Quan Liang, M.a. Bradford, Hamid R. Ronagh
    Abstract:

    The contributions of the concrete slab and composite action to the vertical shear strength of continuous steel–concrete composite beams are ignored in current design codes, which result in conservative designs. This paper investigates the ultimate strength of continuous composite beams in Combined Bending and shear by using the finite element analysis method. A three-dimensional finite element model has been developed to account for the geometric and material nonlinear behaviour of continuous composite beams. The finite element model is verified by experimental results and then used to study the effects of the concrete slab and shear connection on the vertical shear strength. The moment–shear interaction strength of continuous composite beams is also investigated by varying the moment/shear ratio. It is shown that the concrete slab and composite action significantly increase the ultimate strength of continuous composite beams. Based on numerical results, design models are proposed for the vertical shear strength and moment–shear interaction of continuous composite beams. The proposed design models, which incorporates the effects of the concrete slab, composite action, stud pullout failure and web shear buckling, are compared with experimental results with good agreement.

  • Ultimate strength of composite beams in Combined Bending and shear
    2004
    Co-Authors: Hamid R. Ronagh, Qing Quan Liang, M.a. Bradford
    Abstract:

    This paper investigates the ultimate strength of simply supported and continuous composite beams in Combined Bending and vertical shear by using the finite element analysis method. Three-dimensional finite element models have been developed to account for the geometric and material nonlinear characteristics of composite beams. The finite element models are verified by experimental results and employed to study the effects of the concrete slab and the degree of shear connection on the vertical shear strength of composite beams. The moment-shear interaction strength of composite beams is also investigated by varying the moment/shear ratio. The nonlinear finite element analyses show that the concrete slab and composite action significantly increase the ultimate flexural and vertical shear strengths of simply supported and continuous composite beams. Based on numerical results, design models are proposed for the vertical shear strength and moment-shear interaction of composite beams. The proposed design models consider the effects of the concrete slab, composite action, stud pullout failure and web shear buckling on the ultimate strengths of composite beams, and provide economical designs of composite beams in comparison with current design codes.

M.a. Bradford - One of the best experts on this subject based on the ideXlab platform.

  • strength analysis of steel concrete composite beams in Combined Bending and shear
    Journal of Structural Engineering-asce, 2005
    Co-Authors: Qing Quan Liang, M.a. Bradford, Hamid R. Ronagh
    Abstract:

    Despite experimental evidences, the contributions of the concrete slab and composite action to the vertical shear strength of simply supported steel-concrete composite beams are not considered in current design codes, which lead to conservative designs. In this paper, the finite element method is used to investigate the flexural and shear strengths of simply supported composite beams under Combined Bending and shear. A three-dimensional finite element model has been developed to account for geometric and material nonlinear behavior of composite beams, and verified by experimental results. The verified finite element model is than employed to quantify the contributions of the concrete slab and composite action to the moment and shear capacities of composite beams. The effect of the degree of shear connection on the vertical shear strength of deep composite beams loaded in shear is studied. Design models for vertical shear strength including contributions from the concrete slab and composite action and for the ultimate moment-shear interaction ate proposed for the design of simply supported composite beams in Combined Bending and shear. The proposed design models provide a consistent and economical design procedure for simply supported composite beams.

  • Strength Analysis of Steel–Concrete Composite Beams in Combined Bending and Shear
    Journal of Structural Engineering, 2005
    Co-Authors: Qing Quan Liang, M.a. Bradford, Hamid R. Ronagh
    Abstract:

    Despite experimental evidences, the contributions of the concrete slab and composite action to the vertical shear strength of simply supported steel-concrete composite beams are not considered in current design codes, which lead to conservative designs. In this paper, the finite element method is used to investigate the flexural and shear strengths of simply supported composite beams under Combined Bending and shear. A three-dimensional finite element model has been developed to account for geometric and material nonlinear behavior of composite beams, and verified by experimental results. The verified finite element model is than employed to quantify the contributions of the concrete slab and composite action to the moment and shear capacities of composite beams. The effect of the degree of shear connection on the vertical shear strength of deep composite beams loaded in shear is studied. Design models for vertical shear strength including contributions from the concrete slab and composite action and for the ultimate moment-shear interaction ate proposed for the design of simply supported composite beams in Combined Bending and shear. The proposed design models provide a consistent and economical design procedure for simply supported composite beams.

  • ultimate strength of continuous composite beams in Combined Bending and shear
    Journal of Constructional Steel Research, 2004
    Co-Authors: Qing Quan Liang, M.a. Bradford, Hamid R. Ronagh
    Abstract:

    The contributions of the concrete slab and composite action to the vertical shear strength of continuous steel–concrete composite beams are ignored in current design codes, which result in conservative designs. This paper investigates the ultimate strength of continuous composite beams in Combined Bending and shear by using the finite element analysis method. A three-dimensional finite element model has been developed to account for the geometric and material nonlinear behaviour of continuous composite beams. The finite element model is verified by experimental results and then used to study the effects of the concrete slab and shear connection on the vertical shear strength. The moment–shear interaction strength of continuous composite beams is also investigated by varying the moment/shear ratio. It is shown that the concrete slab and composite action significantly increase the ultimate strength of continuous composite beams. Based on numerical results, design models are proposed for the vertical shear strength and moment–shear interaction of continuous composite beams. The proposed design models, which incorporates the effects of the concrete slab, composite action, stud pullout failure and web shear buckling, are compared with experimental results with good agreement.

  • Ultimate strength of composite beams in Combined Bending and shear
    2004
    Co-Authors: Hamid R. Ronagh, Qing Quan Liang, M.a. Bradford
    Abstract:

    This paper investigates the ultimate strength of simply supported and continuous composite beams in Combined Bending and vertical shear by using the finite element analysis method. Three-dimensional finite element models have been developed to account for the geometric and material nonlinear characteristics of composite beams. The finite element models are verified by experimental results and employed to study the effects of the concrete slab and the degree of shear connection on the vertical shear strength of composite beams. The moment-shear interaction strength of composite beams is also investigated by varying the moment/shear ratio. The nonlinear finite element analyses show that the concrete slab and composite action significantly increase the ultimate flexural and vertical shear strengths of simply supported and continuous composite beams. Based on numerical results, design models are proposed for the vertical shear strength and moment-shear interaction of composite beams. The proposed design models consider the effects of the concrete slab, composite action, stud pullout failure and web shear buckling on the ultimate strengths of composite beams, and provide economical designs of composite beams in comparison with current design codes.

Gregory J. Hancock - One of the best experts on this subject based on the ideXlab platform.

  • Numerical simulation of high strength cold-formed purlins in Combined Bending and shear
    Journal of Constructional Steel Research, 2010
    Co-Authors: Cao Hung Pham, Gregory J. Hancock
    Abstract:

    Abstract The paper provides numerical nonlinear simulations, based on the finite element method (FEM) using the software package ABAQUS/Standard, of high strength C-section cold-formed steel purlins in shear and Combined Bending and shear. The simulations are compared with and calibrated against tests performed at the University of Sydney on a variety of section sizes and thicknesses. Studies of the effects of boundary condition, geometric imperfection, and element type as well as mesh size are included. Geometric imperfections are often taken as a scaled multiple of the eigenvalue modes. The selection of eigenmodes and their scaling is given in the paper. The accurate results of the numerical simulations show that finite element analysis can be used to predict the ultimate loads of thin-walled members including the post-buckling behavior of thin-walled sections in shear and Combined Bending and shear. It is demonstrated that finite element analysis can therefore be used to design and optimize thin-walled sections of high strength steel.

  • Experimental Investigation of High Strength Cold-Formed C-Sections in Combined Bending and Shear
    Journal of Structural Engineering, 2010
    Co-Authors: Cao Hung Pham, Gregory J. Hancock
    Abstract:

    In roof systems, a high strength steel profiled sheeting fastened to high strength steel cold-formed purlins of a lipped C- or Z-section is commonly used throughout the world. The design of such systems is performed according to the provisions of the limit states Australia/New Zealand Standard for Cold-Formed Steel Structures in Australia and the North American Specification for the Design of Cold-Formed Steel Structural Members in the United States. In both standards, which include the newly developed direct strength method of design (DSM), the method presented is limited to pure compression and pure Bending. The situations of pure shear and Combined Bending and shear as occurs in a continuous purlin system are not considered. In order to extend the DSM to purlin systems, three different test series on high strength cold-formed C-section purlins have been performed at the University of Sydney. The test series include predominantly shear, Combined Bending and shear, and Bending only test series. Two different section depths and three different thicknesses of the lipped channel section were tested in this study. Further, tests with and without torsion/distortion restraint straps screwed on the top flanges adjacent to the loading points were also considered. This paper summarizes the test results and formulas developed from the effective width method and the DSM. Proposals for design are included in this paper. Comparisons with the Australian Steel Structures Standard are also included to take account of the tension field action.

  • Tests of Channels Subjected to Combined Bending and Web Crippling
    Journal of Structural Engineering, 2002
    Co-Authors: Ben Young, Gregory J. Hancock
    Abstract:

    An experimental investigation of cold-formed channels subjected to Combined Bending and web crippling is described in this paper. A series of tests was performed on unlipped channels rolled from high strength structural steel sheets having nominal plate thickness up to 6 mm, and a maximum web slenderness value of 45. This value is considerably lower than the intended web slenderness values used in the Australian/New Zealand Standard (AS/NZS 1996) and the American Iron and Steel Institute (AISI 1996) specification for cold-formed steel structures. Therefore, the appropriateness of the Combined Bending and web crippling design rules for members with comparatively stocky webs is investigated in this paper. The specimens were tested at various lengths using the Interior-One-Flange loading condition specified in the AS/NZS (1996) and the AISI (1996) specification, and the test strengths are compared with the design strengths obtained from these specifications. Generally, it is shown that the specifications conservatively predicted the strengths of unlipped channels having stocky webs subjected to Combined Bending and web crippling.

  • Experimental investigation of cold-formed channels subjected to Combined Bending and web crippling
    2000
    Co-Authors: Ben Young, Gregory J. Hancock
    Abstract:

    An experimental investigation of cold-formed channels subjected to Combined Bending and web crippling is described in this paper. A series of tests was performed on unlipped channels rolled from high strength structural steel sheets having nominal plate thickness up to 6 mm, and a maximum web slenderness value of 45. This value is considerably lower than the intended web slenderness values used in the AustralianlNew Zealand Standard (AS/NZS 4600, 1996) and the American Iron and Steel Institute (AISI, 1996) Specification for cold-formed steel structures. In the past, the typical thickness of cold-formed steel members was less than 3 mm, and this was due to the limitations of the cold-forming technology in the 1980s. The design rules in the AS/NZS 4600 and the AISI Specification for members subjected to Combined Bending and web crippling are mainly based on test results having plate thickness less than 3 mm with web slenderness values greater than 45. Therefore, the appropriateness of the design rules for members having plate thickness greater than 3 mm is investigated in this paper. The specimens were tested at various lengths using the Interior-One-Flange (lOF) loading condition specified in the AS/NZS 4600 and the AISI Specification. The test strengths are compared with the design strengths obtained using the AS/NZS 4600 and the AISI Specification. Generally, it is shown that the specifications conservatively predicted the strengths of the tested unlipped channels subjected to Combined Bending and web crippling.