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32. Be analysis of bottom sediments in dynamic fluid-structure interaction problems

Author

Aznárez, J. J., Maeso, O., Domínguez Abascal, José, and Universidad de Sevilla. Departamento de Mecánica de Medios Continuos y Teoría de Estructuras

Subjects
Dynamic response, Fluid-structure interaction, Porous saturated solids
Abstract

Sediment materials play an important role on the dynamic response of large structures where fluid-soil-structure interaction is relevant and materials of that kind are present. Dam-reservoir systems and harbor structures are examples of civil engineering constructions where those effects are significant. In those cases the dynamic response is determined by hydrodynamic water pressure, which depends on the absorption effects of bottom sediments. Sediments of very different mechanical properties may exist on the bottom. A three-dimensional BE model for the analysis of sediment effects on dynamic response of those structures is presented in this paper. One of the most extended models for sediment materials corresponds to Biot’s fluid-filled poroelastic solid. The BE formulation for dynamics of poroelastic solids is reviewed including a weighted residual formulation more general and concise than those previously existing in literature. Systems consisting of water, other pressure wave propagating materials, viscoelastic solids and fluid-filled poroelastic zones, are studied. Coupling conditions at interfaces are taken into account in a rigorous way. A simple geometry coupled problem is first studied to asses the effects of sediments on its dynamic response and to determine the influence of parameters such as sediment depth, consolidation, compressibility and permeability. A fully 3-D arch dam-reservoir-foundation system where sediments and radiation damping play an important role is also studied in this paper. Obtained results show the importance of a realistic representation of sediments and the influence of their consolidation degree, compressibility and permeability on the system dynamic response. Ministerio de Ciencia y Tecnología BIA2004-03955-C02-01/02

Published
2006

34. A 3-D boundary element model for the dynamic analysis of arch dams with porous sediments

Author

Juan José Aznárez, Maeso, O., Domínguez, J., and Universidad de Sevilla. Departamento de Mecánica de Medios Continuos y Teoría de Estructuras

Subjects
Sediments, Boundary Element Method, 3D
Abstract

A three-dimensional boundary element technique for dynamic analysis of arch dams including dynamic interaction and sediments on the bottom of the reservoir is presented. The dam and the foundation rock are assumed to be viscoelastic domains with linear behaviour. The water is assumed to be compressible and the sediment is considered as a two-phase poroelastic material according to Biot's theory. The four domains (dam, foundation rock, water and bottom sediments) are discretized and the interaction between them is rigorously represented. The effects of sediments on the dynamic response of arch dams are evaluated for rigid and compliant foundation. Upstream, vertical and cross-stream excitation are considered. The influence of the degree of saturation of the sediment is analysed. Other modelling of the sediment as a single-phase scalar medium are considered in order to reduce the degrees of freedom of the system. Ministerio de Ciencia y Tecnología PB96-1322-C03-03

Published
2001

36. Expanded superposition method for impedance functions of inclined-pile groups.

Author

Saitoh, M., Padrón, L. A., Aznárez, J. J., Maeso, O., and Goit, C. S.

Subjects
SOIL-structure interaction, SOIL dynamics, STRUCTURAL dynamics, BOUNDARY element methods, FINITE element method
Abstract

This paper presents a superposition method expanded for computing impedance functions (IFs) of inclined-pile groups. Closed-form solutions for obtaining horizontal, vertical, and rocking IFs, estimated by using pile-to-pile interaction factors, are proposed. IFs of solitary inclined piles, crossed IFs, and explicit incorporation of compatibility conditions for pile-head movements are also appropriately taken into consideration. All of these factors should be known in advance and will be computed and shown for the most relevant cases. The accuracy of the proposed closed-form solutions is verified for 2 × 2 and 3 × 3 square inclined-pile groups embedded in an isotropic viscoelastic homogeneous half-space soil medium, with hysteretic damping. The pile-to-pile interaction factors are computed by means of a three-dimensional time-harmonic boundary elements-finite elements coupling formulation. The results indicate that the IFs obtained from the proposed method are in good agreement with those obtained from the coupling formulation. Furthermore, crossed vertical-rocking IFs of solitary piles need to be appropriately considered for obtaining rocking IFs when the number of piles is small. Copyright © 2015 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]

Published
2016
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38. Model for the seismic analysis of arch dams including interaction effects

Author

Domínguez Abascal, José, Maeso, O., and Universidad de Sevilla. Departamento de Mecánica de Medios Continuos y Teoría de Estructuras

Subjects
Seismic analysis, Boundary Element Method
Abstract

A three-dimensional boundary element model for the seismic analysis of arch dams is presented. The soil and the dam are assumed to be viscoelastic domains the former being boundless. The water is assume to be compressible subject to small amplitude motions. The three domains are discretized into B ."E. in a single model which includes a rigurous representation of the dam-foundation rock interaction, the water-foundation rock interaction and the traveling wave effects. The response of an arch dam (The Morrow Point dam) to harmonic waves propagating vertically is studied. The important influence of the abovementioned interaction and traveling wave effects is clearly shown by computed results. These results are in contrast with sorne obtained by other authors using a F.E. model.

Published
1992

40. Influences of type of wave and angle of incidence on seismic bending moments in pile foundations.

Author

Zarzalejos, J. M., Aznárez, J. J., Padrón, L. A., and Maeso, O.

Subjects
BUILDING foundations, SEISMIC response, SEISMIC wave studies, SETTLEMENT of structures, STRUCTURAL dynamics
Abstract

SUMMARY When analysing the seismic response of pile groups, a vertically-incident wavefield is usually employed even though it does not necessarily correspond to the worst case scenario. This work aims to study the influences of both the type of seismic body wave and its angle of incidence on the dynamic response of pile foundations. To this end, the formulation of SV, SH and P obliquely-incident waves is presented and implemented in a frequency-domain boundary element-finite element code for the dynamic analysis of pile foundations and piled structures. Results are presented in terms of bending moments at cap level of single piles and 3 × 3 pile groups, both in frequency and in time domains. It is found that, in general, the vertical incidence is not the most unfavourable situation. In particular, obliquely-incident SV waves with angles of incidence smaller than the critical one, a situation in which the mechanism of propagation of the waves in the soil changes and surface waves appear, yield bending moments much larger than those obtained for vertically-incident wavefields. It is also shown that the influence of pile-to-pile interaction on the kinematic bending moments becomes significant for non-vertical incidence, especially for P and SV waves. Copyright © 2013 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]

Published
2014
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