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Investigating the Location of Damping Center to Reduce the Torsional Response of Asymmetric Concrete Structures Under Near-Field Earthquakes

Tarighi, Arash | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41023 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Rahimzadeh Rofooei, Fayaz
  7. Abstract:
  8. Researches carried out on the damages imparted to the building structures under severe earthquakes have shown the importance of asymmetry effects of the buildings on the level of these damages. In these cases, the structures enter into the nonlinear state of their behavior and the structural elements, as well as nonstructural ones undergo large deformations. Additional damping systems have been proposed in many studies to avoid enforcing such large forces on the structures. One example of these systems is viscous fluid damper. The effectiveness of this type of dampers in reduction of the forces has been shown in many previous works. In this research we look for a damping eccentricity which results in the same displacement and acceleration in both flexible and stiff edges of the structural system. A one-storey model with seven different arrangements for centers of stiffness, Resistance and damping has been selected in this study. The different eccentricities are all along one axis. These models are subjected to five one-way near-field earthquake records. Decrease in base shear has been taken into consideration as an index to show the reduction of input energy. Torsional Balance concept has been discussed and verified. Results from Maximum Absolute Values (MAV) and Torsional Balance concept were determined to be almost the same. Finally the proper distribution of the dampers for having the same displacements and accelerations at both stiff and flexible edges and minimum base shear are presented
  9. Keywords:
  10. Torsion ; Concrete Structures ; Viscous Damper ; Near-Field Earthquake

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