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Experimental Analysis of Ribbed Bracing System Behaviour

Fallah, Soheil | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46969 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Golafshani, Ali Akbar; Toufigh, Vahab
  7. Abstract:
  8. Controlling the structures under seismic excitations is a great challenge in the earthquake engineering. In this regard, bracing systems have been presented and applied to provide additional rigidity for the structures. However, conventional bracing systems are buckled under compressive forces. In this research ribbed bracing system (RBS) is proposed to deal with the buckling problem of conventional bracings. Full capacity of RBS is used under cyclic loading. Ribbed bracing system is constructed by adding a supplement part with a ribbed mechanism to the conventional bracing systems. As the supplement part is locked when the bracing is under tensile forces, the bracing system can absorb energy. When the bracing is under compressive forces, the ribs move freely. Thus, buckling is prevented by deducing the length of brace. The proposed system has also a significant impact on the residual and maximum drift deduction. Ribbed bracing system mechanism is examined for completely-closed RBS (CC-RBS) and self-centering RBS (SC-RBS). Based on the results, the theoretical and experimental behaviors of SC-RBS and CC-RBS are compatible, indicating the efficiency and effectiveness of the proposed bracing system. Moreover, since CC-RBS can immediately endure tension force in compressive region, it is expected to reduce maximum drift of the structure during cyclic loading. However, as SC-RBS reaches its initial length after excitation, it decreases residual drift. Based on the investigation, RBS can be appropriately applied as bracing systems for retrofitting old structures and new construction
  9. Keywords:
  10. Braces ; Seismic Loading ; Ductility ; Hysteresis Energy ; Ribbed Bracing System (RBS)

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