Non Linear Behavior of Steel Structures

This is an elective, mandatory course of the ninth semester for students of structural analysis. The course deals with problems of nonlinear behavior of structures, and with the implications of this behavior on the indicated methods of static analysis as well as on the design of these structures. Emphasis is given to problems of flexible structures, where the main form of nonlinearity is geometric, that is, that due to large displacements. However, reference is also made to problems of material nonlinearity, as well as to the interaction of these two types of nonlinearity and the influence of initial imperfections. The main application is the various types of buckling, elastic or inelastic, which mainly concern metal structures. The course seeks a balance between developing a theoretical background and practicing applied methods of analysis and design. An analytical approach is followed for simple structures, aiming at a qualitative understanding of the problems, and then a numerical approach using the finite element method to address these problems in complex, real structures. This results in a better understanding of the theoretical background of the design rules, and the calculation of the ultimate strength of unconventional metal structural members and structures that are not covered by the regulatory provisions. There is a continuous flow of theoretical and applied topics, without separation into theory and exercises. A prerequisite for successful attendance is fundamental knowledge of mechanics and statics. Knowledge of the basic principles of the finite element method is desirable, although not essential.

Teachers: C. Gantes, S. Gatzogiannis.

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