Comparison and Surveying of Methods for Stability Analysis of Steel Frames Based on The AISC Code

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Ahmadi, Mohsen | 2014

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 45893 (09)
University: Sharif University of Technology
Department: Civil Engineering
Advisor(s): Kazemi, Mohammad Taghi
Abstract:
These days steel frames are among the most widespread structural systems, and apart from this, tendency for using slender members in these frames, shows the need for study of effects of axial force and in other words stability of the structure and its members. When secondary effects due to axial gravity forces which results in lateral displacement of the structure come in action, they will reduce strength significantly; as a consequent ductility demand with raise. If this decreased strength exceeds the existing redundant strength, displacements will increase significantly and cause instability of the structure and its collapse. AISC 360-10 has introduced 3 methods for analyzing stability of steel structures including direct analysis method, effective length, and first order analysis. In this study this 3 methods are studied and compared. In this regard, a number of steel frames have been designed and modeled using OpenSees software and analyzed by this 3 methods, and the results have been compared together. These results shows supremacy of direct analysis method, in regard of accuracy and speed
Keywords:
Structural Stability ; Steel Frames ; Second Order Analysis ; Second Order Effect

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