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Nonlinear Analysis of Structures with Concrete Filled Steel Tubular Columns

Hosseini Khasheh Heiran, Farshid | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42771 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Khaloo, Alireza
  7. Abstract:
  8. In recent years using concrete and steel together in buildings and bridges to mix their advantages and compensate disadvantages is very common especially in seismic zones. Using Concrete Filled Steel Tubular (CFST) columns is one of these methods. In these columns, steel tube has longitudinal and lateral reinforcement role for helping concrete core to resist against bending moment, shear and tension. Steel tube also creates confinement in concrete and increase compressive strength and prevents concrete from spalling. Concrete core increases stiffness of column and reduces capability of inward local buckling. Behaviors of CFST columns are influenced by loading, characteristics of materials and geometric of cross section such as nonlinear behavior and ultimate strength of material and shape and width-to-thickness ratio of steel tube section. In this dissertation, first nonlinear behavior of concrete filled steel tubular columns has presented for modeling with considering effective parameters and verified by existing experimental data. Local buckling of steel tube also has considered in this procedure as most important parameter affects behavior of these columns. After modeling concrete filled steel tubular columns, several multistory- multi bays buildings with steel beams were modeled and imposed to nonlinear static analysis. In these studies, effects of lateral load type, number and length of bays, number of floors, column cross section and second order effects on nonlinear analysis are investigated. Results show that in high and medium frames lateral load type can affect results; by increasing number and length of bays, ductility of structures decreases but increases with increasing number of floors. Also, shape of cross sections has not strong effects of nonlinear analysis' results in low width to thickness ratios.


  9. Keywords:
  10. Nonlinear Analysis ; Concrete Filled Steel Tubes (CFT) ; Confinement ; Composite Frames ; Steel Local Buckling

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