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Structural Performance Assessment of Large Unstiffened Openings in Steel Plate Shear Walls and Introduction of Plate-Frame Interaction in Steel Plate Shear Walls with Perforated Infill Plates

Darvishi, Hadi | 2021

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 54701 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Mofid, Masood
  7. Abstract:
  8. One of the advantages of Steel Plate Shear Walls (SPSWs) is the possibility of using openings with varying sizes in the infill plates depending on a need basis. Openings are used for various reasons, such as the possibility of installing utilities and for architectural reasons. However, the latest research studies suggest that the use of large-sized openings in infill plates calls for the use of heavy stiffeners or special measures for ensuring system stability. The seismic behavior of two SPSWs with large unstiffened opening (one with a rectangular opening in the middle of the plate and the other with two oval openings on the sides of the infill plate) was studied experimentally and compared to the behavior of a conventional SPSW without opening. Experiments were carried out on the ½ scale models of a single-story one-bay SPSWs under quasi-static cyclic loads. Experimental study was conducted to compare the structural parameters of the specimens, including their ultimate shear strength, initial stiffness, ductility, and energy absorption capacity of the specimens. The results indicate the acceptable behavior of the specimens even at high levels of drift in all three SPSWs. However, the position and shape of the openings affect the values of the structural parameters. Furthermore, although the ultimate shear strength of the reference specimen was larger than the two other specimens, the values of the ductility ratio and dissipated energy in the specimen with two proposed oval openings are 41.5 and 25.5 times larger than the reference specimen at maximum displacement, respectively. This study explores the effect of introduction of large unstiffened openings in Steel Plate Shear Walls (SPSWs) by considering the opening dimensions and the aspect ratios of the specimens. The decrease in stiffness and shear strength of SPSWs as well as infill plates due to introduction of openings are obvious. However, further studies seem essential to determine the reduction level and the contribution of infill plates and boundary frames to tolerating lateral loads. To reach this aim, an extensive parametric study has been conducted on finite element models of short, mid, and high-rise SPSWs with large unstiffened openings. In the present study, a number of single and multiple story SPSWs with solid infill plates designed according to AISC Seismic Design Provisions and their corresponding models with unstiffened openings are analyzed numerically with the following objectives: (a) To determine the effect of the presence of the openings on the behavior of the boundary frame in both low and high-rise models, and (b) to assess the influence of the position of opening placement on energy absorption, initial stiffness, shear strength, damping, and the ductility ratio of the specimens. In addition, this study provides a comparison of the experimental and numerical results obtained from the finite element models of SPSWs with openings. Accordingly, this study explores the structural behavior as well as Plate-frame interaction characteristics of the SPSW both with and without large unstiffened openings using the finite element and numerical models. At conventional practical ratios (L⁄H <2), the overall loading capacity of the SPSW decreases by 0.9 and 0.75 for the highest and lowest-rise specimens compared to the reference specimen, when an opening is introduced in the infill plate.
  9. Keywords:
  10. Steel Plate Shear Wall (SPSW) ; Steel Plate ; Opening ; Dissipated Energy ; Shear Strength ; Unstiffened Opening

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