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  1. ارزیابی روش‌ های طراحی میراگرهای ویسکوز جهت تقویت لرزه‌ای قاب‌های خمشی بتنی موجود با روش زمان دوام
ارزیابی روش‌ های طراحی میراگرهای ویسکوز جهت تقویت لرزه‌ای قاب‌های خمشی بتنی موجود با روش زمان دوام
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ارزیابی روش‌ های طراحی میراگرهای ویسکوز جهت تقویت لرزه‌ای قاب‌های خمشی بتنی موجود با روش زمان دوام

آقاجانی، محمد حسین Aghajani, Mohammad Hosein

Assessment of Design Methods of Viscous Dampers for Seismic Strengthening of Existing Concrete Moment Frames with Endurance Time Method

Aghajani, Mohammad Hosein | 2025

116 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 58210 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Esmaeil Pourestekanchi, Homayoon
  7. Abstract:
  8. Using viscous dampers is one of the common techniques in the technical literature for seismic strengthening and rehabilitation of existing structures. The key step in dampers design is the distribution of damping coefficients along the height of the structure. For the distribution of damping coefficients along the height of the structure, no standard’s method has been proposed. Today, many researches have been done to introduce optimized pattern for distribution of damping coefficients by using optimization algorithms and iterative nonlinear dynamic analysis. However, the use of these methods is not common among designers and engineering offices due to the need for high expertise and high computational cost. the aim of this study is to investigate and compare the simple and non-iterative methods for distribution of damping coefficients and introduce the best them by means of risk analysis with endurance time method. In this study, three different methods for distributing the damping coefficient of viscous dampers are investigated for mid-rise reinforced concrete moment-resisting frames, subjected to seismic demand increases due to a change in occupancy. A total of 18 2D structural models are developed, categorized into 4, 6 & 8 story frames with 3 & 5 bay that varying bay lengths. The design of existing frames is carried out in SAP2000 in accordance with relevant seismic design codes, while nonlinear dynamic analyses and endurance time method are conducted using OpenSees. After modelling and designing the dampers for all 18 cases using the three aforementioned methods, seismic risk assessment is performed based on the FEMA P-58 methodology using the PACT (Performance Assessment Calculation Tool) software. The expected seismic damage and associated retrofit costs are then estimated, and the life-cycle cost of each retrofitting strategy is evaluated. The endurance time method is employed to compute structural responses under various intensity levels and to develop seismic risk curves for comprehensive comparison
  9. Keywords:
  10. Viscous Damper ; Risk Assessment ; Federal Emergency Management Agency (FEMA)P58 Code ; Endurance Time Method ; Nonlinear Dynamic Analysis ; Damping Factor

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