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- Title
Inelastic displacement ratios for soil-structure systems allowed to uplift.
- Authors
Ghannad, Mohammad Ali; Jafarieh, Amir Hossein
- Abstract
SUMMARY 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. Copyright © 2014 John Wiley & Sons, Ltd.
- Subjects
SOIL-structure interaction; STRUCTURAL dynamics; DESIGN &; construction of building foundations; DISPLACEMENT (Mechanics); NONLINEAR analysis
- Publication
Earthquake Engineering & Structural Dynamics, 2014, Vol 43, Issue 9, p1401
- ISSN
0098-8847
- Publication type
Article
- DOI
10.1002/eqe.2405