| Stability is an important factor to control the critical capacity of the steel structures, and the stability theory and design method of the steel structure should be perfected. Current design codes of the steel structure (GB50017-2003) gave the global stability coefficients of beams under loading of the concentrated load/the uniformly distributed load/the end moments, simultaneously offered its modification factors of the linearly distributed moment. The paper concerns about the beams with consideration of residual stress under loading combined antisymmetric end moments with transverse uniformly distributed load, that formula for the linearly distributed moment used in GB50017-2003 should be modified for the nonlinearly distributed moment, and Kirby,P.A & Nethercot,D.A only suggested an empirical formula .Therefore, it is of theoretical and practical value to investigate it.The paper content of research involved in several respects that followed. Firstly the method of Rayleigh-Ritz and Galerkin were adopted to analyze the beams under loading combined antisymmetric end moments with transverse uniformly distributed load theoretically, and the results were compared with that offered by Kirby,P.A and Nethercot,D.A, it showed that result was approximate and even lower and so to some extent the approach used in the paper is practice. Secondly several principal factors that affect the beam stability were analyzed respectively, especially the shortening effect was mentioned scarely in some literature so far. At last, the author adopted the Matlab to program the finite element software to analyze numerically, the results derived from it were agreed well with it.The subject of investigation in the paper could make up the deficiency of the beams under loading combined antisymmetric end moments with transverse uniformly distributed load, and supported the reference for researchers and designers in the field.
|
PDF Full Text Request