Loading...

Assessing and Fragility Analysis of Collapse of R.C Buildings

Hoseini, Abbas | 2019

449 Viewed
  1. Type of Document: Ph.D. Dissertation
  2. Language: English
  3. Document No: 51863 (53)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Ghaemian, Mohsen
  7. Abstract:
  8. Global collapse in earthquake engineering refers to the inability of a structural system to sustain gravity loads when subjected to seismic excitation. Dynamic instability phenomena in exist buildings have a key position and for this reason strict criteria in structural seismic assessing codes presented for avoiding this phenomena. At this study, dynamic instability of five designed concrete buildings with moment frame system, mixed up 3, 6, 9, 12 and 15 story building, are investigated. P-delta effects, deterioration in strength and stiffness and cyclic deterioration in structural components considered in this investigation. For modeling nonlinear behavior of elements, experimental results employed accompanied by equations purposed by ASCE. Incremental Dynamic Analysis (IDA) for each building and for 20 strong motion records, selected considering far field records, performed. IDA curves are depicted in shape of Sa (T1, 5%) versus maximum interstory drift ratio. OpenSees platform is used for numerical simulation and perform dynamic analysis. Subsequently, Immediate Occupancy (IO), Collapse Prevention (CP) and Global Instability (GI) limit states appointed on IDA curves. Using fragility curves, collapse probability and other limit states for different hazard levels assessed. According to the results, instability potential increases in highest buildings respect to low buildings. Also results revealed that collapse probability in modeling with experimental results is higher than as according ASCE criteria. At last, collapse confidence level assessed considering probable uncertainties and randomness effects. Results show that 9, 12 and 15 story buildings needed to redesign to prevent collapse considering target value of 90% for the acceptance criterion
  9. Keywords:
  10. Collapse Analysis ; Incremental Dynamic Analysis ; Fragility Curve ; Confidence Level ; Uncertainty ; Reinforced Concrete Structures ; Concrete Building

 Digital Object List

 Bookmark

No TOC