Stability analysis of steel structures
At present, there are first-order elastic analysis methods (i.e., traditional calculated length method), second-order P-∆ elastic analysis methods, and direct analysis and design methods (also second-order analysis method) for the stability analysis of steel structures . These three methods appeared successively with the deepening of the theoretical study of steel structure and the development of engineering practice. Before introducing these three stability analysis methods, it is necessary to understand that the stability analysis of steel structure has the following characteristics: (1) the effect of structural deformation on structural internal force cannot be neglected; (2) the stability analysis is nonlinear (geometric nonlinear), and the principle of load superposition cannot be used; (3) the distinction between static and super-static structure has no significance in the stability analysis. 1. First-order elastic analysis method, which can also be called the length...