scispace - formally typeset
Search or ask a question
Book

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
Citations
More filters
Journal ArticleDOI
TL;DR: In this article, a simplified model of the InSight assembly is presented to investigate the attenuation of seismic energy within the shallow regolith covering the range of seismometer deployment distances.
Abstract: NASA’s InSight Mission will deploy two three-component seismometers on Mars in 2018. These short period and very broadband seismometers will be mounted on a three-legged levelling system, which will sit directly on the sandy regolith some 2–3 meters from the lander. Although the deployment will be covered by a wind and thermal shield, atmospheric noise is still expected to couple to the seismometers through the regolith. Seismic activity on Mars is expected to be significantly lower than on Earth, so a characterisation of the extent of coupling to noise and seismic signals is an important step towards maximising scientific return. In this study, we conduct field testing on a simplified model of the seismometer assembly. We constrain the transfer function between the wind and thermal shield and tripod-mounted seismometers over a range of frequencies (1–40 Hz) relevant to the deployment on Mars. At 1–20 Hz the displacement amplitude ratio is approximately constant, with a value that depends on the site (0.03–0.06). The value of the ratio in this range is 25–50% of the value expected from the deformation of a homogeneous isotropic elastic halfspace. At 20–40 Hz, the ratio increases as a result of resonance between the tripod mass and regolith. We predict that mounting the InSight instruments on a tripod will not adversely affect the recorded amplitudes of vertical seismic energy, although particle motions will be more complex than observed in recordings generated by more conventional buried deployments. Higher frequency signals will be amplified by tripod-regolith resonance, probably reaching peak-amplification at $\sim 50$ Hz. The tripod deployment will lose sensitivity at frequencies $>50$ Hz as a result of the tripod mass and compliant regolith. We also investigate the attenuation of seismic energy within the shallow regolith covering the range of seismometer deployment distances. The amplitude of surface displacement decays as $r^{-n}$ , where $1.5 < n < 2$ . This exceeds the value expected for a homogeneous isotropic elastic halfspace ( $n \sim 1$ ), and reflects an increase in Young’s modulus with depth. We present an updated model of lander noise which takes this enhanced attenuation into account.

9 citations

DissertationDOI
03 Dec 2020

9 citations


Cites methods from "Foundation analysis and design"

  • ...Plot a soil curve to represent the non-linear stiffness of the clay stratum, using constitutive relationships such as the oedometric method (Bowles, 1997; Padfield and Sharrock, 1983); 2....

    [...]

  • ...Use Steinbrenner’s algorithm (see Bowles, 1997) to obtain the distribution of changes in vertical stress in the clay stratum....

    [...]

  • ...Plot a soil curve to represent the non-linear stiffness of the clay stratum, using constitutive relationships such as the oedometric method (Bowles, 1997; Padfield and Sharrock, 1983); 2....

    [...]

Journal ArticleDOI
TL;DR: In this article, thirty flat seismic refraction profiles were carried out in the study area northeast of New Minia City to describe the geotechnical properties of the subsoil for construction purposes.

9 citations

Journal ArticleDOI
TL;DR: In this article, the authors present the advantages of static and seismic behavior of the foundations which may present significant structures over similar ones of the same or smaller scale and also emphasize the connection between theory and practice.
Abstract: In engineering, the foundation is a special element of a building It is the connecting part with the soil, which transfers loads from the structure to the ground, so that they are distributed on a wider area, thus avoiding high levels of soil stresses Furthermore, they help the structure to withstand various natural forces like earthquakes, floods, tornadoes, and also to anchor the structure into the ground, thus increasing its stability Over time, people aim to build elaborate structures, first to facilitate the standard living and then, utilizing this primary purpose, to make a substantial contribution to the progress and development of science, through the discovery of new methods This work aims to briefly record, analyze, and comment on special cases of building foundations and infrastructure projects that are in line with modern requirements of research and technology The work furthermore presents the advantages of static and seismic behavior of the foundations which may present significant structures over similar ones of the same or smaller scale There was an effort to develop and comment on the information which explains the general nature of the foundations with their evolutionary activity These concepts, combined with a description of the typical building or infrastructure project, with their characteristics may be a powerful tool not only for future constructions and research but mainly for education The work also emphasizes the connection between theory and practice

9 citations

25 Apr 2016
TL;DR: In this article, the problems of inadequate geotechnical investigations which lead to unsafe designed foundations, construction delays and extra costs for civil engineering projects are discussed, which can arise from lack of client awareness, inadequate finance, insufficient time and lack of expertise.
Abstract: This paper aims to focus on the problems of inadequate geotechnical investigations which lead to unsafe designed foundations, construction delays and extra costs for civil engineering projects. Inadequate geotechnical investigations can arise from lack of client awareness, inadequate finance, insufficient time and lack of geotechnical expertise. The reliability of the information contained in the geotechnical report has strong influence on design, construction, project cost and safety. Thus, it is quite important to have a clear, concise and accurate geotechnical report by qualified geotechnical engineers in order to ensure the reliability of the investigation results. A case is presented to illustrate the problems of inappropriate geotechnical investigation, insufficient knowledge of site condition, and importance of geotechnical supervision.

9 citations


Cites methods from "Foundation analysis and design"

  • ...This investigation is used to assist geotechnical engineers to interpret the surface conditions for design purposes [1]....

    [...]