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Nonlinear Dynamic Analysis of Lightweight Slack Cable-net Structures

Vaezzadeh, Amin | 2022

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 55238 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Dolatshahi, Kiarash; Ahmadizadeh, Mehdi
  7. Abstract:
  8. This study proposes a robust technique for large displacement analysis of slack cable structures subjected to dynamic loadings using a novel method, entitled Node Relaxation. Ordinary numerical methods are usually unable to analyze cable structures due to singularities arising from large displacements and rotations following any alteration of the applied loads. When dynamic loads are considered, handling these singularities in numerical analyses becomes even more challenging. In this thesis, an effective iterative method is proposed for three-dimensional large-displacement dynamic analysis of structures consisting slack cables as the primary load-bearing system. The cable structure is modeled using a set of nonlinear springs with properties that are constantly updated as the structural form gradually responds to the applied loads. The large changes in the cable forms are captured by considering an impedance relation that is used to determine the displacement magnitude in the directions where the structure does not have an appreciable stiffness. The method is verified against closed-form solution of wave transfer phenomenon. The effectiveness of the method is also demonstrated by solving several numerical examples.The collapse resistance of the cable net structures is also inestigated in this research. In this section of the thesis, 24 prototype structures are modeled with various force density levels, span lengths, and the number of spans. Several collapse scenarios, including the cable rupture, column removal, and restrain failure, are defined, and the prototype structures are analyzed considering 168 collapse scenarios. This section of the thesis aims to recognize the critical elements, the weak points, and other decisive parameters to protect the cable net structures against progressive collapse. Analysis results indicate that the restrain failure is the most destructive collapse scenario for cable net structures
  9. Keywords:
  10. Cable Structures ; Large Displacement ; Instability ; Nonlinear Analysis ; Parametric Analysis ; Progressive Collapse Analysis ; Cable Nets ; Pseudo Dynamic Analysis

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