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Stability of cracked concrete hydraulic structures by nonlinear quasi-static explicit finite element and 3D limit equilibrium methods

Flavien Vulliet, Mahdi Ben Ftima and Pierre Léger

Article (2017)

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Cite this document: Vulliet, F., Ben Ftima, M. & Léger, P. (2017). Stability of cracked concrete hydraulic structures by nonlinear quasi-static explicit finite element and 3D limit equilibrium methods. Computers & Structures, 184, p. 25-35. doi:10.1016/j.compstruc.2017.02.007
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Abstract

Several hydraulic concrete structures suffer from severe tridimensional (3D) discrete cracking, producing an assembly of concrete blocks resting one on top of the other. It is important to consider the 3D particularities of the cracked surfaces in the nonlinear sliding safety evaluation of these structures. A methodology to assess a sliding safety factor (SSF) and a sliding direction D for any structure with an a priori known 3D discrete crack surface geometry using the quasi-static explicit nonlinear finite elements method (QSE-FEM) is presented herein in the context of the strength reduction approach. QSE-FEM is known for its efficiency in solving highly nonlinear problems compared to implicit FEM. However, in QSE-FEM, the determination of the incipient failure motion is challenging. In addition to the ratio of kinetic to internal strain energy, a new criterion is proposed to identify sliding initiation based on absolute displacements of a control point. As part of the proposed methodology, a complementary simple tool, 3D-LEM, has been developed as a 3D extension of the classical limit equilibrium method (LEM). It is useful in preliminary sliding analyses to estimate the critical friction coefficient inducing sliding and the corresponding direction D. Three benchmark examples, of increasing complexities, are presented to verify the performance of the proposed methodology. Finally, a case study is adapted from an existing cracked hydraulic structure to evaluate its sliding stability using the QSE-FEM and 3D-LEM approaches. In the three benchmark examples, the same results are found for SSF and D for the two approaches. In the hydraulic structure example, SSFLEM, computed with 3D-LEM, is a lower bound of SSFFEM from QSE-FEM, and a strong correlation is found between the sliding directions computed with the two approaches.

Uncontrolled Keywords

Finite elements; Quasi-static explicit analyses; Limit equilibrium; Three-dimensional analyses; Sliding safety assessment, concrete hydraulic structure

Open Access document in PolyPublie
Subjects: 1100 Génie des structures > 1100 Génie des structures
1100 Génie des structures > 1103 Béton - matériaux et structures
1100 Génie des structures > 1104 Analyse des structures
Department: Département des génies civil, géologique et des mines
Research Center: Non applicable
Funders: FRQNT, CRSNG/NSERC
Grant number: RGPIN137122-04
Date Deposited: 15 Mar 2017 15:00
Last Modified: 12 Mar 2019 01:15
PolyPublie URL: https://publications.polymtl.ca/2482/
Document issued by the official publisher
Journal Title: Computers & Structures (vol. 184)
Publisher: Elsevier
Official URL: https://doi.org/10.1016/j.compstruc.2017.02.007

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