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Studying the Nonlinear Behavior of 2D Steel Frames Fitted with Steel Shear Walls

Moradi, Noorollah | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44262 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Khonsari, Vahid
  7. Abstract:
  8. Regarding the advantages of steel shear walls compared with other lateral load-bearing systems, the need for having better knowledge on their performance becomes more obvious. While much study, either theoretically or experimentally, have been conducted on these systems in the past, less attention has been paid to their nonlinear behaviour. This has happened where in many practical situations some parts of such systems experience nonlinearity. Therefore, it is necessary to study the nonlinear behaviour of such walls either individually or as part of a framing system. In this project, using Finite Elements Methods (FEM), the behaviour of a number of samples of an innovative steel shear wall, devised by the supervisor of this project, in which a particular mechanism was implemented to improve its performance, under ‘monotonic’ and ‘cyclic’ loadings were studied. As a first step, the specimens of the system which were already tested by another student were modeled numerically. Following verifications of the FEM results against their experimental counterparts and making proper corrections and calibrations, a single-spanned one-story frame, fitted with the devised steel shear wall, was subjected to monotonic (push-over) and cyclic loadings. Alternatively, the same frame was fitted with X braces and was studied under same loadings. Besides, the 'bare' frame was also subjected to the two loading regimes, monotonic and cyclic. Comparison between the results of these three types of systems shows that while the frame fitted with the shear wall has much improved stiffness and strength compared to its 'bare' counterpart, yet it is not as over-stiff as the X-braced frame. Moreover, phenomena such as buckling of braces which cause a sharp drop in the strength and the stiffness of the frame, does not happen for the combination of the frame and the shear wall – multiple sequential local bucklings of the wall do not cause such sharp drops in the response of the frame and the response still remains non-fluctuating and smooth. Finally, the push-over results of single-spanned two-story frames, again as 'bare,' 'X-braced,' and also fitted with the shear wall, were obtained and compared with each other
  9. Keywords:
  10. Steel Plate Shear Wall (SPSW) ; Finite Element Method ; Nonlinear Behavior ; Energy Dissipation ; Monotonic Loading ; Cyclic Loading ; Steel Frames ; Two Dimensional Frame

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