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Parametric Investigation of Behavior of Moment Connections to CFST Columns

Ebrahimi, Mostafa | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44572 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Khalu, Alireza
  7. Abstract:
  8. In recent years use of concrete filled steel tube column structures has been increased due to their several advantages. In these columns the steel tube provides confinement for the concrete core of the column, so it increases axial strength and flexibility of the concrete core, and prevents spalling of the concrete. On the other hand the concrete core delays the local buckling steel tube and increases its bearing capacity. In addition, these columns have higher stiffness and strength than typical concrete columns due to placement of steel in farthest point of column cross section. The steel tube besides its structural role acts as framework for the concrete core and reduces time and cost of construction. Application of this structure system has been limited because of the complexity of its beam-column connections, however many solutions have been suggested to solve this problem. One of the best solutions is use of the connections that transfer the connection forces into the concrete core. These mechanisms due to its capability of reducing tension concentration on the tube wall and providing the column bearing capacity reduction are very suitable, but simplicity of implementation of the connection shall be considered. In this research, a parametrical investigation has been made by using 3D finite element analysis on three types of these connections using blind-bolts with cogged extension under cyclic loading. The results have shown that in all three types of connections, yielding of blind-bolts are the worst failure mode, so by considering an appropriate design method this failure mode shall be prevented, and they could be used in high seismic zones
  9. Keywords:
  10. Finite Element Analysis ; Concrete Filled Steel Tubes (CFT) ; Beam Column Connection ; Cyclic Loading ; Parametric Study ; Concrete Filled Steel Tublar Columns (CFST)

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