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Investigation of Shear Strength of Fillet Weld under In-Plane Eccentricity

Rezaei, Alireza | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57368 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Maleki, Shervin; Moazezi Mehre Tehran, Alireza
  7. Abstract:
  8. The principal objective of this investigation is to furnish a straightforward and effective technique for computing the load-bearing capacity of fillet welds when subjected to in-plane eccentric loads. Some approaches have been put forth to ascertain the load-carrying capability of fillet welds under such conditions over time. The existing design methods, such as the conventional elastic method, are very conservative and do not match the test results well due to neglecting the weld group's ductility and strain compatibility. On the other hand, the instantaneous center of rotation method (IC) considers the above parameters but requires complex calculations. Therefore, in the present study, a method for designing the fillet welds is introduced, which considers the inelastic properties of the welds in a simple manner while providing an accurate prediction of the weld group capacity. Considering the ductility of welds in this method, it is assumed that the stress distribution in welds is uniform when the weld reaches its maximum bearable deformation. The proposed method is much more accurate than the conventional elastic method in the design of fillet welds. It is much simpler than the IC method, which has limitations and complexity in calculations. The performance of the proposed method, called herein the “Plastic Design Method”, has been analytically compared and evaluated with the prequalified IC method. For all considered cases, the ultimate loads obtained from the proposed plastic method are slightly different from those of the IC method and are mainly on the safe side. In addition, for a more detailed examination of the fillet weld's resistance under in-plane eccentric loads, 12 experimental specimens were considered at three different angles of loading of 0, 45, and 75 degrees. The results obtained also affirm the efficacy of the proposed method
  9. Keywords:
  10. Fillet Welds ; In-Plane Eccentricity ; Elastic Design Method ; Plastic Design Method ; Rotation Instantaneous Center Method ; Weld Strength

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