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Method of Estimating the Response Modification Factor for Stiffened Steel Shear Wall Systems

Aslani, Jalal | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42494 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Bakhshi, Ali
  7. Abstract:
  8. Steel shear wall systems have been introduced as a lateral load resisting system since 1970s. Based on the designer’s choice, this system can be used with or without stiffeners. Employing stiffeners prevents the elastic buckling of steel plates which can enhance the system to absorb more energy. The design code for using stiffners has not developed yet in Iran since this kind of systems is not common practice. In this study, the Response Modification Factor (R), as an important factor in the design procedures of structures, is investigated for 2 to 10-story building structures which have steel shear walls with 3 and 6 millimeters thickness with 3, 4 and 6 meters spans.To this end, the force-displacement curve is calculated using non-linear static analysis by incremental lateral loading. The simplified force-displacement curve and Uang's method are used for the calculation of their overstrength factor and ductility factor. the results show that the overstrength factors are between 1.5 and 2 for all cases. These values do not show any clear relation with number of stories and the thickness of steel shear wall. However, they have inverse relation with the length of wall span. Conversly, ductility factors have a direct relation with the length of wall span and ranges from 3 to 6. In addition, minimum and maximum values of R factor are obtained between 8 and 12, respectively; Also the 80 percent of calculated Rs are greater than 9. Moreover, incremental nonlinear dynamic analysis has been conducted on a 6-story building structure. The results showed a value of R equal to 15, which indicates 50 percent increase over previous studies. This means that in real earthquakes we can relie more on the structures.
  9. Keywords:
  10. Steel Plate Shear Wall (SPSW) ; Strength Reduction Factor ; Stiffener ; Incremental Static Inelastic Analysis ; Uang،s Method ; Response Modification Factor (R) ; Finite Element Method

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