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Inelastic displacement ratios for soil-structure systems allowed to uplift

Ghannad, M. A ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1002/eqe.2405
  3. Abstract:
  4. The simultaneous effects of soil-structure interaction, foundation uplift and inelastic behavior of the superstructure on total displacement response of soil-structure systems are investigated. The superstructure is modeled as an equivalent single-degree-of-freedom system with bilinear behavior mounted on a rigid foundation resting on distributed tensionless Winkler springs and dampers. It is well known that the behavior of soil-structure systems can be well described using a limited number of nondimensional parameters. Here, by introducing two new parameters, the concept is extended to inelastic soil-structure systems in which the foundation is allowed to uplift. An extensive parametric study is conducted for a wide range of the key parameters through nonlinear time history analyses. It is shown that while uplifting soil-structure systems experience excessive displacements, in comparison with systems that are not allowed to uplift, ductility demand in the superstructure generally decreases owing to foundation uplift. A new inelastic displacement ratio (IDR) is proposed in conjunction with a nonlinear static analysis of uplifting soil-structure systems. Simplified expressions are also provided to estimate the proposed IDR
  5. Keywords:
  6. Ductility demand ; Inelastic displacement ratio ; Soil structure interactions ; Ductility demands ; Foundation uplift ; Inelastic displacement ratios ; Non-dimensional parameters ; Non-linear static analysis ; Nonlinear time history analysis ; Simplified expressions ; Single degree of freedom systems ; Soils ; Displacement ; Ductility ; Dynamic response ; Foundation ; Seismic response ; Tension ; Uplift
  7. Source: Earthquake Engineering and Structural Dynamics ; Vol. 43, issue. 9 , July , 2014 , p. 1401-1421 ; ISSN: 00988847
  8. URL: http://onlinelibrary.wiley.com/doi/10.1002/eqe.2405/abstract