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The Analytical Study of the Nonlinear Behavior of Conventional and Retrofitted Khorjini Connections

Hosseinzadeh, Shahram | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46213 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Moghaddam, Hassan
  7. Abstract:
  8. The purpose of this research is to study the behavior of conventional and retrofitted Khorjini connections. Thus the software ABAQUS 6.11 was used to fabricate the FEM models of the connections with experimental prototypes. In analytical studies, 21 specimens with different size of the connection components were analyzed. True stress–strain curves for steel and weld materials were used and damage initiation and revolution were considered in the weld material. Also cracking of the welds were considered by a micromechanical method. Behavioral characteristics of the conventional connections are specified and appropriate relations are suggested, using Stability equations of the connection components. Main defects of the connection are severe initial stiffness deterioration and Strain jump in the connection critical weld. So effects of two different retrofitting methods on improving the behavior of the connection were investigated. In the first method different number of stiffeners were placed in the angles of the connection. Results show that this method have no considerable effect on the connection behavior. In the next method, four plates which were placed between web of beams and edges of column flanges and welded to the column flanges’ edges and beam flanges and web, were added to common details in order to improve connection behavior. Analytical results indicate that stiffness is considerably increased and stress and strain concentration in the connection welds are highly decreased, in the second retrofitted connection
  9. Keywords:
  10. Scissor Connection ; Nonlinear Behavior ; Cracking Rotation ; Finite Element Method ; Steel Structures ; Strain Jump

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