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Numerical Study on Bolted End-Plate Connection and The Code Limits

Hassanpoor, Mohammad Hossein | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48202 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Kazemi, Mohammad Taghi
  7. Abstract:
  8. Regarding the numerous casualties and financial losses due to intense earthquakes, the ductility is considered of the main importance in addition to stability, stiffness, and strength criteria of the structure’s connections. In order to enhance the seismic behavior of the structures in such severe earthquakes, design codes for steel structures have suggested special types of connections. Among them, bolted end plate connection is considered a conventional type of connection used for creating ductile semi-rigid connection.In this study, in order to simulate the behavior of this joint, a 3-D finite element model is developed in Abaqus software, in which the inelastic behavior of the materials and large deformations have been considered. The numerical results were then compared to the experimental data, which showed that the behaviors of the numerical models were in acceptable accordance with those of experimental investigations. Then, a parametric study was conducted with the variables: thickness of the end plate, bolts diameter, horizontal distance of bolts, vertical distance of bolts, number of bolts, end plate stiffeners, and column web stiffeners; and the effects of each parameter on the flexural behavior, strength, ductility, and initial stiffness of the joint were measured. The results reveal that the capacity and the stiffness of the joints enhances when the thickness of the end plate increases, and the place of the plastic hinge is shifted toward the beam. An increase in the bolts diameter intensify the joint stiffness, while it decreases the ductility at the same time. Any increase in the horizontal and vertical distance of bolts results in the enhancement of the joint ductility, while the stiffness is reduced on the other hand. The column web stiffeners prevent the development of the plastic hinge in the column and enhance the behavior of the joint. Utilizing end plate stiffeners and more bolts affects the failure mechanism, and enhance the capacity of the connection. Finally, the limitations of the design code was scrutinized and relevant suggestions were offered
  9. Keywords:
  10. Steel Moment Resistant Frame ; Bolted Connection ; Ductility ; Finite Element Method ; Beam Wall Connection ; Fixed Flanged Joint ; Semi-Rigid Beam-to-Column Joint

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