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Tiago L. D. - One of the best experts on this subject based on the ideXlab platform.

  • Parametric Study Of Tubular Kk Multiplanar Steel Connections
    2016
    Co-Authors: Nadia C. S., Joao Alberto, Tiago L. D.
    Abstract:

    This paper presents a parametric study of symmetrically loaded multiplanar KK connections in circular hollow steel sections. The connections were designed with gaps between the diagonal braces. Analyses were performed using the commercial finite element program Ansys. A total of 54 KK connections and their corresponding uniplanar K connections were analyzed and compared in terms of the connection resistance. A new objective criterion to assess the two failure modes most often occurring in KK connections is proposed. Failure mode 1 is observed when two neighboring diagonal braces loaded in the same sense act as one brace penetrating the Chord together. In failure mode 2, excessive deformation is observed in the Chord region between two neighboring braces, folding the Chord Wall. However, in some cases, the failure mode is not easily identified, or both failure types are present The proposed criterion is based on the diametric deformation of the Chord and objectively assesses the failure mode. By comparing the connection resistance of KK and K connections as determined using numerical analyses, analytical expressions to predict the connection resistance of KK connections were developed. The expressions accurately predict the connection resistance based on geometric parameters and the resistance of the corresponding uniplanar K connection. (C) 2015 Elsevier Ltd. All rights reserved

  • Parametric Study Of Tubular Kk Multiplanar Steel Connections
    'Elsevier BV', 2016
    Co-Authors: Nadia C. S., Joao Alberto, Tiago L. D.
    Abstract:

    Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)This paper presents a parametric study of symmetrically loaded multiplanar KK connections in circular hollow steel sections. The connections were designed with gaps between the diagonal braces. Analyses were performed using the commercial finite element program Ansys. A total of 54 KK connections and their corresponding uniplanar K connections were analyzed and compared in terms of the connection resistance. A new objective criterion to assess the two failure modes most often occurring in KK connections is proposed. Failure mode 1 is observed when two neighboring diagonal braces loaded in the same sense act as one brace penetrating the Chord together. In failure mode 2, excessive deformation is observed in the Chord region between two neighboring braces, folding the Chord Wall. However, in some cases, the failure mode is not easily identified, or both failure types are present The proposed criterion is based on the diametric deformation of the Chord and objectively assesses the failure mode. By comparing the connection resistance of KK and K connections as determined using numerical analyses, analytical expressions to predict the connection resistance of KK connections were developed. The expressions accurately predict the connection resistance based on geometric parameters and the resistance of the corresponding uniplanar K connection. (C) 2015 Elsevier Ltd. All rights reserved.114188195Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)V&M do Brasil Company [05 P-17311/2007]Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES

Jeffrey A. Packer - One of the best experts on this subject based on the ideXlab platform.

  • Fillet weld effective lengths in CHS X-connections. II: Finite element modelling, parametric study and design
    Journal of Constructional Steel Research, 2018
    Co-Authors: Kyle Tousignant, Jeffrey A. Packer
    Abstract:

    Finite element (FE) modelling was performed to extend the results of a recently completed experimental test program to evaluate the static strength of fillet welds in X-connections between circular hollow sections (CHS). Non-linear FE models with weld fracture were validated by comparison of spot strains, load-deformation response, and fracture load with 12 experimental tests. Two hundred and fifty-six FE weld-critical CHS-to-CHS X-connections, with varied branch-to-Chord diameter ratio, Chord Wall slenderness, branch inclination angle, and branch-to-Chord thickness ratio, were analysed under quasi-static branch tension. The effect of these parameters on fillet weld strength is illustrated, and the structural reliability (or safety index) of North American specification provisions for weld effective lengths is confirmed. An alternative method for estimating fillet weld strength, with specific weld effective lengths, is proposed. Recommendations for a new design approach that meets the minimum target safety index in North America are made.

  • fillet weld effective lengths in chs x connections i experimentation
    Journal of Constructional Steel Research, 2017
    Co-Authors: Kyle Tousignant, Jeffrey A. Packer
    Abstract:

    Abstract For the first time, an experimental test program was conducted to assess the strength of fillet welds in circular hollow section (CHS) connections. Six large-scale, fillet-welded CHS-to-CHS X-connections were designed with varied key parameters that affect the weld strength: branch-to-Chord diameter ratio, Chord Wall slenderness, and branch inclination angle. By means of quasi-static tension applied to the branches, fracture of 12 test welds (two per connection) was obtained. Strain distributions measured adjacent to the welds indicated a weld effective length less than the total weld length, under pure axial load. Branch loads at rupture were also measured and used to determine the structural reliability of existing AWS provisions for weld effective lengths in CHS-to-CHS X-connections. For the range of parameters studied, the provisions are found to be very conservative. Hence, methods are assessed to accurately quantify the weld effective length. A parametric modelling study is presented in a companion paper to develop more liberal recommendations.

Ju Chen - One of the best experts on this subject based on the ideXlab platform.

  • Punching Shear Mechanism Based Design of Concrete-Filled CHS T-Joints under In-Plane Bending
    'Universitat Politecnica de Valencia', 2018
    Co-Authors: Xu Fei, Chan Tak-ming, Ju Chen
    Abstract:

    [EN] The in-plane bending behaviour of concrete-filled circular hollow section (CHS) T-joints was examined in this paper. The main failure mode, the punching shear of the Chord-Wall, was observed from the test of four large-scale joints with the diameter ratio of brace to Chord (β) ranging from 0.44 to 0.85. The tube-Wall deformation was measured to assess the governing failure mode of the composite joints. Complementary finite element (FE) methodology was verified against the experimental findings and the validated FE models were used to further investigate the mechanical behaviour and the design methodology. The feasibility to apply a fracture criterion in the material-level to a large-scale structural simulation was evaluated. The validated FE modes could successfully capture the tube-Wall fracture initiation and propagation. Based on both experimental and numerical investigations, it was shown that the capacity of composite joints was governed by the ultimate strength limit, i.e. punching shear strength, due to the infill concrete that mitigated both inward and outward deformation on the compressive and tensile sides, respectively. The analytical model was established to reveal the composite actions between the tube and the inner concrete, and to elaborate the development of the flexural section-resistance. Finally, the design equation was proposed and could well predict the moment capacity.Xu, F.; Chan, T.; Chen, J. (2018). Punching Shear Mechanism Based Design of Concrete-Filled CHS T-Joints under In-Plane Bending. En Proceedings of the 12th International Conference on Advances in Steel-Concrete Composite Structures. ASCCS 2018. Editorial Universitat Politècnica de València. 573-580. https://doi.org/10.4995/ASCCS2018.2018.7513OCS57358

  • mechanical behaviour of concrete filled chs connections subjected to in plane bending
    Engineering Structures, 2017
    Co-Authors: Fei Xu, Ju Chen, Takming Chan
    Abstract:

    Abstract This paper presents an investigation on the mechanical behaviour of concrete-filled circular hollow section (CHS) connections. Four large-scale connection specimens were tested to failure under in-plane bending. The main test parameters included Chord-Wall slenderness and diameter ratio between brace and Chord. The main failure mode observed from the tests was Chord-Wall punching shear failure. Meanwhile the Chord-Wall deformation was also investigated to determine the governing limit state. Complementary finite element (FE) methodology was validated against the experimental findings and the validated FE models were used to further study the mechanical behaviour and the strength design of the connections. The modified Mohr-Coulomb criterion (MMC) was introduced into the finite element models to capture steel fracture failure. Based on both experimental and numerical investigations, a theoretical analytical model with the consideration of the inner concrete was established and an ultimate strength design equation was proposed accordingly to predict the punching shear strength for concrete-filled CHS connections under in-plane bending.

  • experimental investigation of concrete filled steel tubular longitudinal gusset plate connections
    Journal of Constructional Steel Research, 2016
    Co-Authors: Ju Chen, Weiliang Jin
    Abstract:

    Abstract A series of tests on the concrete-filled tubular gusset plate T–connections is presented in this paper. Three different loading conditions, including axial tension, eccentric tension and in-plane bending, were applied to the brace. The Chord Wall slenderness ratio ( D / t ) of the test specimens ranged from 48 to 75. The material properties of the steel and concrete used in the test specimens were measured. Each connection was tested to failure, and the behavior under loading was recorded. Punching shear failure of the Chord member was the main failure mode observed during the tests. The test results were compared with the current AISC-360 and CIDECT DG1 design predictions, which only concern hollow section steel tubular connections. It is shown that the design strengths predicted by the current design rules are quite conservative for all the test specimens examined in this study. It is recommended that the contribution of concrete be considered in the design because it could effectively restrain the deformation of the Chord Wall that was observed in the test. The proposed design equations predict the ultimate strengths of the concrete-filled tubular gusset plate T–connections generally well.

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

  • Parametric Study Of Tubular Kk Multiplanar Steel Connections
    2016
    Co-Authors: Nadia C. S., Joao Alberto, Tiago L. D.
    Abstract:

    This paper presents a parametric study of symmetrically loaded multiplanar KK connections in circular hollow steel sections. The connections were designed with gaps between the diagonal braces. Analyses were performed using the commercial finite element program Ansys. A total of 54 KK connections and their corresponding uniplanar K connections were analyzed and compared in terms of the connection resistance. A new objective criterion to assess the two failure modes most often occurring in KK connections is proposed. Failure mode 1 is observed when two neighboring diagonal braces loaded in the same sense act as one brace penetrating the Chord together. In failure mode 2, excessive deformation is observed in the Chord region between two neighboring braces, folding the Chord Wall. However, in some cases, the failure mode is not easily identified, or both failure types are present The proposed criterion is based on the diametric deformation of the Chord and objectively assesses the failure mode. By comparing the connection resistance of KK and K connections as determined using numerical analyses, analytical expressions to predict the connection resistance of KK connections were developed. The expressions accurately predict the connection resistance based on geometric parameters and the resistance of the corresponding uniplanar K connection. (C) 2015 Elsevier Ltd. All rights reserved

  • Parametric Study Of Tubular Kk Multiplanar Steel Connections
    'Elsevier BV', 2016
    Co-Authors: Nadia C. S., Joao Alberto, Tiago L. D.
    Abstract:

    Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)This paper presents a parametric study of symmetrically loaded multiplanar KK connections in circular hollow steel sections. The connections were designed with gaps between the diagonal braces. Analyses were performed using the commercial finite element program Ansys. A total of 54 KK connections and their corresponding uniplanar K connections were analyzed and compared in terms of the connection resistance. A new objective criterion to assess the two failure modes most often occurring in KK connections is proposed. Failure mode 1 is observed when two neighboring diagonal braces loaded in the same sense act as one brace penetrating the Chord together. In failure mode 2, excessive deformation is observed in the Chord region between two neighboring braces, folding the Chord Wall. However, in some cases, the failure mode is not easily identified, or both failure types are present The proposed criterion is based on the diametric deformation of the Chord and objectively assesses the failure mode. By comparing the connection resistance of KK and K connections as determined using numerical analyses, analytical expressions to predict the connection resistance of KK connections were developed. The expressions accurately predict the connection resistance based on geometric parameters and the resistance of the corresponding uniplanar K connection. (C) 2015 Elsevier Ltd. All rights reserved.114188195Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)V&M do Brasil Company [05 P-17311/2007]Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES

Kyle Tousignant - One of the best experts on this subject based on the ideXlab platform.

  • Fillet weld effective lengths in CHS X-connections. II: Finite element modelling, parametric study and design
    Journal of Constructional Steel Research, 2018
    Co-Authors: Kyle Tousignant, Jeffrey A. Packer
    Abstract:

    Finite element (FE) modelling was performed to extend the results of a recently completed experimental test program to evaluate the static strength of fillet welds in X-connections between circular hollow sections (CHS). Non-linear FE models with weld fracture were validated by comparison of spot strains, load-deformation response, and fracture load with 12 experimental tests. Two hundred and fifty-six FE weld-critical CHS-to-CHS X-connections, with varied branch-to-Chord diameter ratio, Chord Wall slenderness, branch inclination angle, and branch-to-Chord thickness ratio, were analysed under quasi-static branch tension. The effect of these parameters on fillet weld strength is illustrated, and the structural reliability (or safety index) of North American specification provisions for weld effective lengths is confirmed. An alternative method for estimating fillet weld strength, with specific weld effective lengths, is proposed. Recommendations for a new design approach that meets the minimum target safety index in North America are made.

  • fillet weld effective lengths in chs x connections i experimentation
    Journal of Constructional Steel Research, 2017
    Co-Authors: Kyle Tousignant, Jeffrey A. Packer
    Abstract:

    Abstract For the first time, an experimental test program was conducted to assess the strength of fillet welds in circular hollow section (CHS) connections. Six large-scale, fillet-welded CHS-to-CHS X-connections were designed with varied key parameters that affect the weld strength: branch-to-Chord diameter ratio, Chord Wall slenderness, and branch inclination angle. By means of quasi-static tension applied to the branches, fracture of 12 test welds (two per connection) was obtained. Strain distributions measured adjacent to the welds indicated a weld effective length less than the total weld length, under pure axial load. Branch loads at rupture were also measured and used to determine the structural reliability of existing AWS provisions for weld effective lengths in CHS-to-CHS X-connections. For the range of parameters studied, the provisions are found to be very conservative. Hence, methods are assessed to accurately quantify the weld effective length. A parametric modelling study is presented in a companion paper to develop more liberal recommendations.