| 英文摘要 |
As the axial loading applied on the member, residual stress, initial crookedness and the initial eccentricity will affect the overall stability of the member. In the research, we investigated the residual stress, initial crookedness and initial eccentricity respectively for the instability phenomenon of bending buckling for compressive members. The study found that residual stress, initial crookedness and initial eccentricity affect the buckling load of weak axis more than strong axis at the same values of slenderness ratio. Then, we will discuss the critical load and stable coefficient of the different specifications such as AISC specification of the allowable stress method, the load and resistance factor design method and the GB specification of Mainland China. The calculation results and theoretical analysis of the specifications above will be compared. The different section widths with a fixed section height were also considered with these initial defects for critical loading of members. The normalized critical stresses of weak axis were affected by change of the section width factors, but the change was not significant for the normalized critical stresses of strong axis. Finally, the research proposed correction factor of slenderness ratio for weak axis design of steel sections. The results will be suggested to AISC Specification to ensure the same safety level of steel section on critical load calculation of strong & weak axis. |
