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Probabilistic Estimation of Maximum Inelastic Displacement Demands for Performance-Based Design Considering Soil-Structure Interaction

Aboutorabian, Elham | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43962 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Rahimzadeh Rofooei, Fayaz
  7. Abstract:
  8. In the current design Codes, the estimation of maximum inelastic Single Degree Of Freedom (SDOF) displacements is done through simplified procedures by either applying modification factors on maximum SDOF elastic displacement demands or by considering equivalent SDOF systems with elongated fundamental period and increased damping ratio. Thus, the inherent uncertainty caused by approximating maximum inelastic displacements with maximum elastic displacements is neglected. On the other hand, in time history dynamic analysis of structures, the free field recorded ground motions are applied to the base of structures. Obviously, this procedure would be correct when the structure is built on firm soils. Otherwise, the structural responses under soil-structure interaction could be different depending on the soil conditions. The purpose of this study is to use the available probabilistic methods in estimation of the mean annual frequencies of exceedance of maximum inelastic displacement demands and uniform hazard spectra of maximum inelastic displacement demands through use of site-specific elastic seismic hazard curves in a region of high seismicity in California, considering soil-structure interaction. For this purpose, a number of single degree of freedom systems with a wide range of natural periods and lateral strength ratio with elastoplastic behavior are considered with a damping ratio equal to 5%. The concept of Cone models and a combination of lateral and rotational springs and dashpots were used for modeling the effect of Soil-Structure Interaction (SSI). Nonlinear dynamic time history analyses were carried out using 28 earthquake components recorded on A, B, C, D soil types. The results indicate that although site effect plays a notable role for estimation of inelastic displacement ratio for case of soft soils, the effect becomes less important when soil-structure interaction effect takes into account
  9. Keywords:
  10. Soil-Structure Interaction ; Nonlinear Dynamic Analysis ; Uniform Hazard Spectrum

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