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Site-dependent strength reduction factors for soil-structure systems

Ghannad, M. A ; Sharif University of Technology | 2007

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  1. Type of Document: Article
  2. DOI: 10.1016/j.soildyn.2006.06.002
  3. Publisher: 2007
  4. Abstract:
  5. The effect of soil conditions on strength reduction factors (SRFs) is investigated. Both site effect and soil-structure interaction (SSI) effect are considered in the study with special emphasis on the latter effect. The structure is modeled as an elasto-plastic single degree of freedom (SDOF) system, whereas the underlying soil is considered as a homogeneous half-space. The half-space is also replaced by a simplified 3DOF system, based on the concept of Cone Models. The whole 4DOF model is then analyzed under a total of 54 strong motions recorded on different soil types. A parametric study is done for a wide range of non-dimensional parameters, which completely define the problem. It is concluded that SSI reduces the SRF values, especially for the case of buildings located on soft soil. Consequently, using the fixed-base SRFs for soil-structure systems lead to non-conservative design forces. Simplified expressions are proposed to estimate SRF for soil-structure systems. © 2006 Elsevier Ltd. All rights reserved
  6. Keywords:
  7. Degrees of freedom (mechanics) ; Ductility ; Mathematical models ; Soil mechanics ; Soils ; Structural design ; Cone Models ; Strength reduction factors ; Soil structure interactions ; Building ; Dynamic response ; Seismic response ; Site effect ; Soft soil ; Soil-structure interaction ; Strong motion ; Structural response
  8. Source: Soil Dynamics and Earthquake Engineering ; Volume 27, Issue 2 , 2007 , Pages 99-110 ; 02677261 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0267726106000807