Nonlinear Analysis of Inelastic Steel Frames

• Published in: Fourth International Conference on Advances in Steel Structures pp. 217 - 224
• Main Authors: Xu, L., Liu, Y.
• Format: Book Chapter
• Language: English
• Published: Elsevier Ltd 2005
• ISBN: 9780080446370; 008044637X
• DOI: 10.1016/B978-008044637-0/50031-7

The chapter presents a method for the nonlinear inelastic analysis of steel frames. Introducing flexural stiffness degradation factor to characterize stiffness deterioration associated with inelastic flexural deformation, the stiffness matrix for beam-column members accounting for geometrical nonlinearity, shear deformation, and post-elastic flexural behavior is established for an incremental load analysis procedure. The material constitutive model accounts for a nonlinear behavior under single and or combined stress states. The computational model allows the incremental analysis to reach the loading levels at which instability and/or plastic mechanisms occur. In the computational model, the influence of residual stresses on initial-yield and full-yield capacities of members is accounted for. The proposed nonlinear analysis method is applied to two benchmark steel frame examples. Comparisons between the proposed method and other published methods are presented in the chapter. The results suggest that the proposed method realistically accounts for geometrical nonlinearity and inelastic flexural behavior, and is computationally efficient.