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Seismic Risk Analysis Considering Soil-Structure Interaction

Khosravikia, Farid | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48397 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Ghannad, Mohammad Ali; Mahsouli, Mojtaba
  7. Abstract:
  8. The primary objective of this thesis is twofold: First, the effect of soil-structure interaction (SSI) and SSI seismic design provisions on the seismic risk estimates of buildings are studied. Risk, in this context, denotes the probability distribution of seismic monetary loss due to structural and non-structural damage. The risk analysis here uncovers the probability that SSI is beneficial, detrimental, or ineffective on seismic losses. Moreover, the consequence of practicing SSI provisions of current seismic codes on the seismic risk of structures is investigated. Second, the consequences of practicing the SSI provisions of two prominent seismic design guidelines, i.e., ASCE 7-10 and the 2015 NEHRP on the performance of building structures are evaluated and compared. The letter forms the basis of ASCE 7-16 standard. The analyses are conducted for a wide range of buildings with different structural systems, heights, aspect ratios, and foundation embedment ratios on various soils. Probabilistic models are employed to predict the response, damage, and repair cost of the buildings. In addition, to properly account for the ground motion uncertainty, a suite of nearly 7000 accelerograms recorded on soil is employed. It is concluded that structures on very soft soils are extremely likely to incur smaller losses due to SSI, which is in line with the common belief that SSI is a favorable effect for such systems. However, the results for buildings on moderately soft soils reveal a considerable probability, up to 0.4, that SSI has an adverse effect on the structure and increases the seismic losses. In addition, practicing the SSI provisions of seismic design codes leads to inconsistent levels of risk. Finally, it is concluded that practicing the SSI provisions of NEHRP, in lieu of those from ASCE 7-10, generally leads to neither more economic nor safer designs
  9. Keywords:
  10. Soil-Structure Interaction ; Risk Analysis ; Seismic Design Codes ; Structural Failure ; Monetary Loss ; Non-Structural Damage

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