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Seismic Performance Improvement of Reinforced Concrete Moment Resisting Frame Systems With Some Selected Prestressed Columns and Comparison with Self-Centering Systems

Khodabakhshi, Nahid | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52285 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Khaloo, Alireza
  7. Abstract:
  8. In seismic regions, the construction of structures with appropriate seismic performance and re-centering capability that can reduce residual displacement and damage, are necessary. As an alternative, prestressed columns were developed in recent years which can limit the permanent deformation and structural damage effectively. After severe damage and residual displacement of bridge piers and building’s columns, extensive research was carried out on prestressed columns. Most researches have been conducted on the prestressing of bridge piers and precast columns in self-centering system but prestressed columns in common moment resisting frame and comparing their advantages and disadvantages with self-centering frame are discussed less. In self-centering structures, the precast beam and column are connected to each other by prestressed tendons, and unlike the common moment resisting frame, the columns have rocking motion. In this study, the finite element analysis method has been done using Abaqus software. The numerical and the experimental results are compared and the accuracy of the modeling is assured. Also three prestressed fix base, self-centering rocking base and reinforced concrete columns were modeled under cyclic loading and their residual displacement and dissipated energy are compared. Then, the performance of these columns were evaluated by dynamic and cyclic analysis in 16 concrete building models using Opensees software. The results show that maximum displacement of the rocking structures is similar to that of the RC structures, but their residual displacement, even in severe earthquakes, is on average 10% of the residual displacement of the reinforced concrete structures
  9. Keywords:
  10. Prestressed Column ; Self-Centering Rocking Column ; Finite Element Analysis ; Cyclic Loading ; Dynamic Analysis ; ABAQUS Software ; OpenSees Software

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