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Shear Lag Effects on Shear Rupture Failure Mode of Welded Steel Channel Sections

Pashnehtala, Parsa | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47557 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Maleki, Shervin
  7. Abstract:
  8. Since mid-twentieth century the shear lag phenomenon has attracted many scientists’ attention which led to a wide range of researches to be carried out on this topic and the results are considered in the design codes. In tension members in which all parts of the member in the vicinity of the connection are not connected, only some parts of the section contribute to load distribution and non-connected parts do not play any role in load transfer and this leads to non-uniform distribution of stress and stress concentration. This phenomenon is called shear lag which causes reduction of tensile strength of the member. The effect of this phenomenon is introduced as a reduction coefficient multiplied by net section area to obtain the section effective area in order to find the tensile strength in tensile rupture limit state in critical area in most of the current codes such as ANSI/AISC 360-10 [1]. This project is investigatiog the effects of this phenomenon on the probable reduction of tensile strength of tension members in another limit state called shear rupture. To reach this goal, single and double channel sections that are welded from the flange edge are modeled in ABAQUS 6.13 using the finite element method and the results have been verified by comparison with former tests’ results. A numerical parametric study has been conducted which includes several parameters like weld length, weld size, section symmetry, out of plane eccentricity of axial force, channel web and flange thickness, net length of member and gusset, gusset thickness, and gusset net width and steel yielding to ultimate stress ratio. Finally, new developed formulas and some suggestions have been proposed to the current codes to have a better predictions for this limit state by considering the reducing effects of shear lag in shear rupture limit state
  9. Keywords:
  10. Tension Members ; Shear Lag ; Welded Joint ; Shear Rupture ; Block Shear ; Channel Sections

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