Design of Steel Plate Shear Wall Systems with Explicit Consideration of Drift Demands and Frame Action

• Author / Creator

  Safari Gorji, Meisam

• This research presents a performance-based design procedure for steel plate shear wall (SPSW) systems with explicit consideration of plastic mechanisms, inelastic drift demands and frame actions. The proposed design procedure generally adopts the philosophy of a recently developed performance-based plastic design (PBPD) methodology in which an energy-work balance concept is employed to produce structures with targeted seismic performance, taking advantage of plastic analysis method and capacity design principles. The intention is to address some of the shortcomings of current SPSW design practice. Based on extensive nonlinear response-history analyses of SPSWs having different bay widths and overall heights, a simple empirical expression was proposed for predicting yield drift ratio, which is an essential parameter to be used at the beginning of the design process. A step-by-step design procedure was presented and various design parameters were studied. The validity of the proposed design approach was tested by evaluating the seismic behaviour of case study SPSWs designed for buildings located in Canada and the U.S. having different seismic hazard levels. Next, the proposed approach was used as a reliable design procedure to perform a comprehensive study of alternative SPSW configurations, aiming to improve some of the drawbacks of the conventional SPSW systems. As such, the design procedure was further extended to include two other SPSW configurations, namely (1) SPSW with Outriggers (SPSW-O) and (2) Coupled SPSW (C-SPSW). The above-mentioned SPSW configurations are intended to enhance the overturning stiffness of SPSWs, while improving material efficiency and providing architectural flexibility. The plastic method of structural analysis was used to investigate the behaviour, mechanisms and efficiency of these SPSW configurations, and to develop procedures for efficient design of such structural systems. Four different SPSW-O options were discussed and their structural characteristics were investigated in terms of lateral load resistance and overturning stiffness. A simple parameter called the outrigger efficiency factor (OEF) was defined to quantify the level of the overturning stiffness provided by the outrigger system; this allows for the comparison of various SPSW-Os on a consistent basis. Closed form analytical expressions that capture the ultimate lateral strength and OEF SPSW-Os were developed and compared with numerical simulations with reasonable agreement. Furthermore, a comprehensive parametric study was conducted to investigate the influence of a number of parameters on the behaviour of SPSW-O systems. Parameters subjected to investigation included the height of the systems, the length and properties of the outrigger beams, and the types of beam-to-column connections used in the systems. Subsequently, 12- and 20-story SPSW-O systems were designed using the proposed design procedure; and their seismic performances were evaluated under a suite of 20 ground motions representing the design-level earthquakes. Further, the proposed design approach was extended to the coupled SPSW systems considering two different options, namely (1) C-SPSW with simple boundary frame connections and (2) C-SPSW with moment-resisting boundary frame connections. The C-SPSW configuration constitutes a dual system in which a substantial proportion of the story shear is resisted through the moment-resisting actions of the coupling beams and boundary frame elements. The principles of plastic analysis and capacity design were used to develop procedures for efficient designs of the two C-SPSW options by explicitly considering the contributions of the frame actions to the overall lateral strengths of such systems. This was done by estimating an appropriate proportion of the design force that should be used to size the infill plates within each system. Eight and 12-story C-SPSWs were designed using the proposed procedures, along with two uncoupled pairs of SPSWs designed for comparison. A series of nonlinear response history and pushover analyses were conducted to evaluate and compare the seismic performances of the prototypes.

• Subjects / Keywords

  • Plastic Analysis
  • Steel Plate Shear Wall
  • Frame Action

• Graduation date

  Spring 2017

• Type of Item

  Thesis

• Degree

  Doctor of Philosophy

• DOI

  https://doi.org/10.7939/R33J39H4T

• License

  This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.