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Structural Engineering and Mechanics Volume 67, Number 3, August10 2018 , pages 267-275 DOI: https://doi.org/10.12989/sem.2018...267 |
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Simplified model for analysis of soil-foundation system under cyclic pushover loading |
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Ouassila Kada, Ahmed Benamar and Abdelkader Tahakourt
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| Abstract | ||
| A numerical study of soil-foundation system under monotonic and cyclic pushover loading is conducted, taking into account both material and geometric nonlinearities. A complete and refined 3D finite element (FE) model, using contact condition and allowing separation between soil and foundation, is implemented and used in order to evaluate the nonlinear relationship between applied vertical forces and induced settlements. Based on the obtained curve, a simplified model is proposed, in which the soil inelasticity is satisfactorily represented by two vertical springs with trilinear behavior law, and the foundation uplifting is insured by gap elements. Results from modeling soil-foundation system supporting a bridge pier have shown that the simplified model is able to capture irreversible settlements induced by cyclic rocking, due to soil inelasticity and vertical loading, as well as large rotations due to foundation uplifting. | ||
| Key Words | ||
| soil-foundation interaction; foundation uplifting; soil inelasticity; pushover analysis | ||
| Address | ||
| Ouassila Kada: 1) Civil Engineering Department, Faculty of Technology, University of Bejaia, Targua Ouzemour, 06000, Algeria 2) Normandie University, UNIHAVRE, CNRS, LOMC, 53 rue Prony, CS 80540, 76058 Le Havre Cedex, France Ahmed Benamar: Normandie University, UNIHAVRE, CNRS, LOMC, 53 rue Prony, CS 80540, 76058 Le Havre Cedex, France Abdelkader Tahakourt: Laboratoire de Génie de Construction et Architecture (LGCA), Faculty of Technology, University of Bejaia, Targua Ouzemour, 06000, Algeria | ||