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Study of Shear Lag Effect on Non-rectangular RC Shear Walls

Tabiee, Mohammad | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54283 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Khaloo, Alireza
  7. Abstract:
  8. The present study aims to evaluate the effect of the shear-lag on non-rectangular RC shear walls and develop equations to determine the axial stress and strain distributions and calculate the effective flange width. Research has shown that a non-rectangular shear wall under a lateral load experiences the largest axial stress and strain in the flange-web cojunction. This phenomenon is referred to as the shear-lag effect and reduces the bending capacity of the shear wall. As a result, the effective flange width is typically defined to consider the shear lag effect. The present work first reviewed the literature on the effects of shear lag on non-rectangular RC shear walls. Then, flanged shear walls with arbitrary sections were analytically evaluated in the elastic range. Drawing on the developed equations, the influential parameters were identified and parametrically studied. For the parametric study, a numerical laboratory (FlashLab) was developed based on ABAQUS for the nonlinear simulation of flanged shear walls under cyclic loading. To extract equations from shear walls of common sections (i.e., T-, U-, and L-shaped), evolutionary polynomial regression was utilized. Finally, the developed equations were compared to the existing formulations in the literature. It was found that the developed analytical equations could accurately simulate shear lag in the linear range. Moreover, the use of shell elements significantly reduced the computational effort and had good accuracy in the behavior simulation of cyclically-loaded flanged shear walls. Based on several numerical shear wall models, the developed equations showed satisfactory performance
  9. Keywords:
  10. Shear Lag ; Genetic Algorithm ; Parametric Study ; Stress Distribution ; Axial Stress ; Strain Distribution ; Evolutionary Polynomial Regression (EPR) ; Flanged Sections ; Effective Flange Width ; Non-Rectangular Reinforced Concrete Shear Wall

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