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Determination of Response Modification Factor for Steel Frames with Saddle (Khorjini) Connections and RC Shear Walls on the Basis of FEMA P695 Rationale

Mive, Reza | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54987 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Alijani Moghaddam, Hassan
  7. Abstract:
  8. Steel structure with saddle connections constitutes a portion of the old steel structures in Iran. During past strong ground motions such as Manjil and Bam earthquakes, these structures were vulnerable and experienced significant damages. These structures were widely used due to their easy installation. However, according to their unpromising behavior, they need an appropriate lateral force-resisting system. A concrete shear wall is one of the suitable lateral force resisting systems that can improve the behavior of steel frames with saddle connections. To find the coefficients of seismic performance factors including response modification factor, overstrength factor, and deflection amplification factor as per FEMA P695 for steel frames with semi rigid saddle connections and ordinary concrete shear walls, 24 structures with various heights, periods, plans, and seismic regions in 8 performance groups are studied. The structures are subjected to nonlinear static (pushover) analyses and nonlinear incremental dynamic analyses. The coefficients and parameters are found as per FEMA P695 and are compared with the allowable values in FEMA P695. Results yielded that the trial response modification factor and deflection amplification factor (R = 5 , Cd=5) were valid for long period structures in seismic design category C and for short period structures in seismic design category Cmin. For short period structures in seismic design category Cmax lower response modification factor and deflection amplification factor is recommended. Overstrength value obtained for this system as 3.0
  9. Keywords:
  10. Reinforced Concrete Shear Wall ; Response Modification Factor (R) ; Seismic Performance Factors ; Nonlinear Incremental Dynamical Analysis ; Federal Emergency Management Agency (FEMA)P695 Code ; Static Pushover Analysis ; Saddle (Khorjini)Connections

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