Influence of residual stress on the carrying-capacity of steel framed structures.Numerical investigation

摘要

In order to assess explicitly the influence of residual stresses on the inelastic behavior of the steel frames a new computer program NILDFA (Non-linear Inelastic Large Deflection Frame Analysis) was elaborated by the authors.The states of strain,stress and yield stress are monitoed explicitly during each step of the analysis and the effects of residual stresses are accurately included in the analysis.Three residual stress patterns,constant,linear and parabolic distribution has been considered for three types of calibration frames; a portal frame,a six-story two-bay frame and a two-story frame.The numerical tests and the comparisons made proved the effectiveness of the proposed analysis method.