Abstract
This paper describes the feasibility of applying a modified linear structure analysis computer program in the ultimate limit state design of unbraced steel frames. The elastic–plastic hinge zone concept and the linear elastic structural analysis computer program SAP90, are used to simplify the nonlinear steel frame structural analysis model. Most steel structures are designed by plastic theory, called ‘ultimate limit state design’. In practice, most steel structure analysis is performed by linear elastic computer programs that do not take into account either inelastic behavior or calculation of the ultimate strength. Herein, a modified analysis approach is presented and its design implications discussed. The results obtained from the modified approach are provided and compared with both experimental data and the inelastic structural analysis computer program DRAIN-2DX with respect to the ultimate strengths and the lateral displacements of unbraced steel frames. Copyright © 1999 John Wiley & Sons, Ltd.
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