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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 46328 (09)
- University: Sharif University of Technology
- Department: Civil Engineering
- Advisor(s): Kazemi, Mohammad Taghi
- Abstract:
- The use of steel as one of the most widely used materials in the construction of structures is accompanied by problems and among them the problem of establishing stability in structure is important. To provide stability in the structure as a whole and for each of its elements, the new edition of the American Specification for Structural Steel Buildings, has introduced three general methods based on the elastic analysis. It includes, direct analysis method, effective length method and first-order analysis method. Each method has advantages and disadvantages. The present study is divided into two parts. The first part gives an overview of the behavior of structures and methods of determining their status (in terms of stability and instability). The second part is devoted to the methods of design for achieving the required strength against loads (unstable factors). In this thesis, the common methods for stability analysis, history and basic assumptions of the methods are studied. Then some samples of the steel frames are selected for studies and by using various methods of the specification, design methods are compared together. According to the analyses were performed, direct analysis method encompasses simplicity in the design process and provides more accurate predictions of structural behavior compared to the other two methods. Due to the limitations in criteria of the specification, the first order analysis method can be used only in the frames with moderate nonlinear behavior. Although the effective length method has wider application than the first order analysis method, the design process of compression members is longer than the two other methods. To check the correctness of analysis programs written in this study, post-buckling behavior of several specific structures with a high nonlinear behavior was studied and outputs of the programs were compared with the results of other researchers. Finally, by using a benchmark problem of the specification, the effects of the number of elements per member on the accuracy of results were examined. According to the results, the required accuracy of the specification will be satisfied by the selection of two elements per beam-column
- Keywords:
- Stability Analysis ; Steel Structures ; Second Order Effect ; Effective Length ; First-Order Theory ; Direct Analysis Method
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