座屈・耐荷力(桁・板)

[I-111] Numerical investigation on the mechanical behavior of rolled H-beam end under partial cross-section loss process

〇Takao MIYOSHI¹, Kanayo Nakatani (1.National Institute of Technology, Akashi College)

Keywords:rolled H-beam bridge, girder end, partial cross-section loss, deformation, residual stress re-distribution

Residual stress and geometric imperfections influence seriously on ultimate strength of steel structures. An existing experiment observed change of them under partial cross-section loss process. However, the changes at the main girder end of rolled H-beam have not been clarified yet. This study analytically investigated on the change of residual stress and deformation under partial cross-section loss process of an end stiffener. As a result, residual stresses on cross-section loss portion re-distributed around the portion. Also, cross-section loss portion deformed out-of-plane to opposite direction of the cross-section loss side so that it was squashed by eccentric compression force.