STP1526

    Modeling of Crack Propagation in Weld Beam-to-Column Connections Submitted to Cyclic Loading with a Cohesive Zone Model

    Published: Jan 2011


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    Abstract

    During the earthquakes in Japan and California in the 1990s, cracks appeared in some weld beam-to-column connections of heavy rigid frame steel buildings. This prompted the necessary assessment of the performance of weld connections in terms of rotation capacity and crack propagation. In the present study, experimental tests were performed where weld connections were submitted to cyclic loadings with increasing amplitude until a macrocrack event was reached. However the crack phenomenon depends on many parameters: The geometry, the material, the welding process…. For this reason, it was interesting to develop a finite element modeling of these connections in order to complete these experiments and perform a parametric study. This paper describes the finite element model development, its material parameter identification, and its comparison with experimental results. The weld connections were modeled by using three-dimensional mixed solid elements. The constitutive laws applied were elastoplastic with isotropic hardening identified for the base metal and the weld metal. Crack propagation was modeled by a cohesive zone model. The parameters of this cohesive zone model were identified by an inverse method with the modeling of three-point bending tests of pre-cracked samples performed on the base and weld metals. The fatigue damage generated by the cyclic loading was computed by the fatigue continuum damage model of Lemaitre and Chaboche, which was coupled with the cohesive zone model.

    Keywords:

    cohesive zone, fatigue, finite element, beam-to-column connection, welding


    Author Information:

    Lequesne, Cédric
    Univ. of Liège, Liège,

    Plumier, André
    Univ. of Liège, Liège,

    Duchêne, Laurent
    Univ. of Liège, Liège,

    Habraken, Anne Marie
    Univ. of Liège, Liège,


    Paper ID: STP49312S

    Committee/Subcommittee: E08.05

    DOI: 10.1520/STP49312S


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