繰返し荷重下のコンクリート充填鋼管の局部座届発生条件

概要

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Using numerical analysis based on a finite element method employing axisymmetric thin shell elements, the beginning and progress of local buckling in circular concrete filled steel tubes (CFT) subjected to cyclic axial loads were investigated. The numeric analysis revealed that the infinitesimal changes in deformation of a tube occurred from the start of cyclic loading, and at last the changes lead the severe buckling mode and the deterioration in strength of the tube. From the analytical results, a formula to predict the start of cyclic local buckling for CFT was proposed in a manner of the accumulated damage law. The formula gave the lower bound for data from tests on actual cold-formed steel tubes. The similar formula was also proposed for rectangular CFT members.
2006-10-30