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Foundation analysis and design

01 Jan 1968-
TL;DR: In this paper, Fondation de soutenagement et al. presented a reference record for Dimensionnement Reference Record created on 2004-09-07, modified on 2016-08-08.
Abstract: Keywords: Fondation ; Mur de soutenement ; Pieux ; Capacite portante ; Ancrage ; Dimensionnement Reference Record created on 2004-09-07, modified on 2016-08-08
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Journal ArticleDOI
TL;DR: The proposal provides a rigorous approach to the task of upscaling from particle mechanics to continuum mechanics, but is simplified compared to a full discrete element analysis, leading to an alternative framework of stress–strain constitutive modelling of granular materials that in particular considers directional dependency.
Abstract: This paper proposes a new way of describing effective stress in granular materials, in which stress is represented by a continuous function of direction in physical space. The proposal provides a rigorous approach to the task of upscaling from particle mechanics to continuum mechanics, but is simplified compared to a full discrete element analysis. It leads to an alternative framework of stress–strain constitutive modelling of granular materials that in particular considers directional dependency. The continuous function also contains more information that the corresponding tensor, and thereby provides space for storing information about history and memory. A work-conjugate set of geometric rates representing strain-rates is calculated, and the fundamental principles of local action, determinism, frame indifference, and rigid transformation indifference are shown to apply. A new principle of freedom from tensor constraint is proposed. Existing thermo-mechanics of granular media is extended to apply for the proposed functions, and a new method is described by which strain-rate equations can be used in large-deformations modelling. The new features are illustrated and explored using simple linear elastic models, producing new results for Poisson’s ratio and elastic modulus. Ways of using the new framework to model elastoplasticity including critical states are also discussed.

1 citations

Book ChapterDOI
01 Jan 2021
TL;DR: In this paper, the authors studied various challenges encountered during the design and construction of pile foundations in non-liquefiable and liquefiable soils and presented various suitable, appropriate, feasible and technically acceptable solutions adopted to overcome the same.
Abstract: Pile foundation is considered as a suitable and best foundation system at the site with the top stratum of soils possessing comparatively lower bearing capacity with respect to intended loads. It is also recommended at the site where soils possess susceptibly liquefaction potential (liquefaction prone site). In the present paper, it is studied various challenges encountered during the design and construction of pile foundations in non-liquefiable and liquefiable soils. It is also presented various suitable, appropriate, feasible and technically acceptable solutions adopted to overcome the same. In the present work, it is also investigated various suitable methodologies adopted for the construction of pile foundations considering site condition and size of projects. It is also briefed the engineering measures adopted at liquefaction prone site for pile foundation, ground improvements and liquefaction mitigation techniques. Various codes and their guidelines for construction, testing of pile foundation also briefed. It is observed, evaluation of various soil properties from the geotechnical investigation, evaluation of liquefaction potential of soil is very essential before selecting the appropriate pile foundation system and design the same in non-liquefiable and liquefiable soil. Suitable construction methodology also very essential to accomplish the execution of pile foundation safely, meeting desired quality and within the required time frame.

1 citations

Journal ArticleDOI
19 Sep 2017
TL;DR: In this article, the behavior of reinforced concrete raft foundations for multi-story buildings is studied and a reliability assessment tool for multistage building raft foundations subjected to earthquake loading is developed.
Abstract: The paper studies the behavior of reinforced concrete raft foundations for multi-story buildings. It also develops a reliability assessment tool for multi- story building raft foundations subjected to earthquake loading. Several multi-story buildings with various configurations, heights, and soil profiles, were subjected to several ACI code combinations of gravity and earthquake loads from different seismic zones. The reliability of the raft foundations of these buildings was assessed using the reliability index approach based on their resistance to the applied loads. Also, the responses of the multi-story buildings under these loading combinations were studied and analyzed in order to draw recommendations and guidelines for the preliminary design of structurally efficient and reliable raft foundations in earthquake zones.

1 citations


Cites methods from "Foundation analysis and design"

  • ...A nonlinear finite element analysis was conducted using the commercial software STAAD-PRO to obtain the building drifts and reactions [8] [9] [11]....

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Journal ArticleDOI
TL;DR: In this paper, the authors performed lateral load tests of connected-pile foundations for transmission tower and found the resistance increasing factors for connectedpile foundation in silty clay, and the tests were performed in various conditions that lateral load directions and height, the stiffness of beams in the connected pile foundations were changed.
Abstract: Pile foundation for transmission tower constructed in weak ground can cause the damage of the tower due to the different settlement between the foundations. In Japan and USA, connected-pile foundations whose 4 foundations are connected each other by beams were used for transmission tower (TEPCO 1988, IEEE 2001). Resistance increasing factors for connected-pile foundation signify increasing amount of resistance due to the effect of connected-pile material. In this study, we performed model lateral load tests of connected-pile foundations for transmission tower and found the resistance increasing factors for connected-pile foundation. The tests were performed in silty clay, and the resistance increasing factors were founded in various conditions that lateral load directions and height, the stiffness of beams in the connected-pile foundations were changed. The resistance increasing factors from our research were presented as a function of normal lateral loading height and normal stiffness of the connected-pile material. The resistances which were estimated from the resistance increasing factors were similar to measured values.

1 citations