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Formation and Development of Plastic Hinges in Structures With Concrete Filled Steel Tubular Columns Using Nonlinear Static Analysis

Abdoos, Hatef | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47244 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Khaloo, Alireza
  7. Abstract:
  8. concrete-filled steel tube offers many practical advantagescompared withconventional structural systems. The concrete infill provides stiffness and strength in compression and restrains local and global buckling. The inelastic deformation capacity of the CFT system is increased by the confinement of the concrete fill by the thin, ductile steel tube, and this significantly contributes to the seismic performance.
    In this research, Formation and development of plastic hinges in CFST frames using pushover analysis was investigated. Different frames with rectangular and circular column and I beam weredesigned and Using nonlinear finite element analysis, interaction between steel and concrete and confinement effects of steel tubes on concretebehavior as key parameters were considered.
    According to complex behavior of CFST columns in composite systems, there is no definite trend in plastic hinge formation of designed frames.The main reason for reducing the resistance of composite columns may be due to local buckling of steel tubes.meanwhile,Lateral load pattern and considering the secondary effects have a negligible effect on the formation of plastic hinges
  9. Keywords:
  10. Nonlinear Static Analysis ; Composite Frames ; Steel Local Buckling ; Plastic Hinges ; Concrete Filled Steel Tublar Columns (CFST) ; Confined Concrete ; Confinement

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