Navegando por Autor "Arcaro, Vinicius Fernando"

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    Behavior analysis of bar gaps in welded YT-joints for rolled-steel circular hollow sections.
    (2010) Vieira, Rosilene de Fátima; Requena, João Alberto Venegas; Sarmanho, Arlene Maria Cunha; Arcaro, Vinicius Fernando
    We present a parametric analysis of gap variation between the lap brace and through brace of YT welded joints for rolled-steel circular hollow sections on plane steel structures. Our aim is to investigate the collapse behavior of YT-joints under lap brace axial compression. In particular, we focus on e/d0 ratios above 0.25 so bending moments can be taken into account during the design. We find that joint failure is primarily due to chord wall plastification (Mode A) and cross-sectional chord buckling (Mode F) in the region underneath the lap brace. Our joint design followed the Limit States Method, and our results were based on a comparative analysis of three different methods: an analytical solution derived from a set of international technical norms, an experimental analysis, and numerical modeling using Ansys as calibrated by our experimental results.
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    Numerical and experimental analysis of yield loads in welded gap hollow YT-joint.
    (2009) Vieira, Rosilene de Fátima; Requena, João Alberto Venegas; Sarmanho, Arlene Maria Cunha; Arcaro, Vinicius Fernando
    This paper presents an analytical, experimental, and numerical analysis of plain steel, circular hollow sections welded into a YT joint. The overall behavior and failure of the joint are characterized under axial compression of the lap brace. There are two joint failure modes: plastic failure of the chord face and local buckling of the chord walls. Numerical finite element models agree with the experimental data, in terms of principal stress near the joint intersection, with an accuracy of around 10%. The finite element model thus proves to be reliable and accurate, and will be used in future parametric studies.