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Equivalent linear model for existing soil-structure systems

Sameti, A. R ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1142/S0219455414500990
  3. Publisher: World Scientific Publishing Co. Pte Ltd
  4. Abstract:
  5. The concept of equivalent linearization is extended for the soil-structure systems, in which the strength ratio (defined as the ratio of the yielding strength to the elastic strength demand) is known rather than the ductility ratio. The nonlinear soil-structure system is replaced by a linear single-degree-of-freedom (SDOF) system, which can capture the response of the actual system with sufficient accuracy. The dynamic characteristics of the equivalent linear SDOF system are determined through a statistical approach. The super-structure is modeled by an inelastic SDOF system with bilinear behavior, and the homogeneous half space beneath the structure by a discrete model, following the Cone Model. To cover a wide range of soil-structure systems, a comprehensive parametric study is conducted using a set of nondimensional parameters for the soil-structure system. The accuracy of the equivalent linear parameters is then assessed. The results confirm that the proposed equivalent linear model can capture the simultaneous effects of soil-structure interaction (SSI) and nonlinearity in the super-structure concerning the maximum inelastic response of the soil-structure system
  6. Keywords:
  7. Soil-structure interaction ; Degrees of freedom (mechanics) ; Ductility ; Geometry ; Linearization ; Soil structure interactions ; Dynamic characteristics ; Equivalent damping ratios ; Equivalent linear model ; Equivalent linearization ; Equivalent periods ; Non-dimensional parameters ; Single degree of freedom systems ; Strength ratios ; Soils
  8. Source: International Journal of Structural Stability and Dynamics ; Volume 16, Issue 2 , 2016 ; 02194554 (ISSN)
  9. URL: http://www.worldscientific.com/doi/abs/10.1142/S0219455414500990