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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: In this article, two parallel, adjacent bridges crossing the Colorado River in Mexico were subjected to a broad field of laterally spreading ground during the 2010 Mw 7.2 El Mayor-Cucapah earthquake, and two-dimensional finite element analyses were used to quantify the influence that the presence of each bridge had on the lateral spreading demand for the opposite bridge.
Abstract: Studies recently conducted by the authors and others have demonstrated that relatively simple equivalent-static analysis (ESA) procedures can adequately predict the response of bridge foundations to lateral spreading for design purposes assuming that the lateral spreading displacement demand is known or can be estimated. However, an important aspect of the analysis that remains to be addressed is how to account for the restraining force provided by foundations when the laterally spreading ground does not have a finite, measurable out-of-plane width. This study addresses this problem in the context of two parallel, adjacent bridges crossing the Colorado River in Mexico that were subjected to a broad field of laterally spreading ground during the 2010 Mw 7.2 El Mayor–Cucapah earthquake. Two-dimensional finite element analyses (FEA) are used to quantify the influence that the presence of each bridge had on the lateral spreading demand for the opposite bridge. The results show that the relatively stiff founda...

1 citations


Cites background from "Foundation analysis and design"

  • ...35, typical for loose cohesionless soil (Bowles 1996)....

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  • ...The results were found to be relatively insensitive to a range of Poisson’s ratio between 0.2 and 0.35, typical for loose cohesionless soil (Bowles 1996)....

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Journal Article
TL;DR: In this article, the problems of design of machine foundations for the special case of vertical mode of vibration for block foundation are presented in the context of MATHCAD and empirical design method is used to get the results.
Abstract: The problems of design of machine foundations for the special case of vertical mode of vibration for block foundation are presented in this paper. The empirical design method is used to get the results using a computer program MATHCAD dealing with the parameters related to the machine. Design charts that are prepared to be a guide for the designer engineer are drawn. The design charts are based on the variables limitations including the properties of the soil, machine and foundation. The design charts are based on three displacements which are acceptable for design of the machine foundation. ةصلاخلا يدومعلا هاجتلااب نئاكملا سسا اهل ضرعتت يتلا لكاشملا ةسارد ثحبلا نمضتي ةيلتكلا سسلال تمدختسا دقل . ( يباسح جمانرب ةدعاسمب جئاتنلا ىلع لوصحلل ةيعضولا ةقيرطلا MATHCAD ) لاو ذ ي دودح عم لماعتي هنكاملا عم طبترت . لا سدنهملل دشرمك ميمصتلل لوادج دامتعا مت دقل عقوملا يف ممصم تدمتعا ميماصتلا لوادج . تاحازا ثلاث ىلع تدمتعا ثيح .ساسلااو ةنكاملا ,ةبرتلا نم لك صاوخ نمضتت يتلاو تاريغتملا تاددحم .ميمصتلا ةيحان نم ةلوبقم ربتعت يتلاو

1 citations

Journal ArticleDOI
TL;DR: Numerical examples confirm the necessity of the developed algorithms for large soil problems and confirm the efficiency of the used iterative solvers.
Abstract: In this paper, out-of-core solution algorithms are used for analyzing large 3D soil problems. Such problems involve huge number of degrees of freedom. The soil continuum is modeled using 3D multi-region boundary element method. The overall stiffness matrix resulted from the multi-region boundary element problem is large, sparse and non-symmetric. The soil stiffness matrix is divided into series of sub-matrices according to the available computer memory. Each sub-matrix is assembled individually, hence only the non-zero elements are stored on the hard disk (out-of-core). The BiCGStab (l) and GMRES (m) iterative solvers are implemented to solve the overall system of equations. The innovative part in this paper is the coupling of the developed out-of-core solution with these iterative solvers. Read-in algorithms are developed where the non-zero elements of each sub-matrix are read-in element-by-element sequentially, to fit within relevant operations inside the used iterative solvers. Such a procedure reduces the used computer memory and accelerates the solvers time. The presented numerical examples confirm the necessity of the developed algorithms for large soil problems and confirm the efficiency of the used iterative solvers. In addition, the used iterative solvers give similar performance.

1 citations

Journal Article
TL;DR: In this article, the authors conducted a geotechnical assessment of the soil in Hilla city and found that the soil profile consists of clay-silt to silt-clay with small amount of sand below natural ground surface for shallow depths.
Abstract: Wathiq Jasim Mouer Al-Jabban Lecturer AssistanceBabylon UniversityPresidency of University Abstracts Establishing a realistic working profile of soil properties has been, and is still, one of the most challenging problems facing geotechnical engineers. Geotechnical assessment are important and plays a critical role in all construction works particularly in projects involved substantial amount of ground improvement, so, it was helped in suggesting design for appropriate control measures. This study can provide and use as a reference and guidance to estimate site characterization of Hilla city that can be used as potential inputs for designing structures by the city planner, civil and geotechnical engineers. In order to make a geotechnical evaluation and make a general description to determine types of the subsoil of the study area, Five boreholes was drilled to a depth of (15m) from existing ground surface at several sites and laboratory tests were carried out in each area of Hilla city, in addition to large existing data as a results of in-site and laboratory tests from previous geotechnical studies taken from 110 boreholes distributed over different area in Hilla city. Chemical Analysis for soil and ground water were conducted and the results shows that ground water is small alkalinity, medium to high in salts and it has contain harmful amount of sulfates. Result of chemical tests of soil shows that the sulphat contact of soil between (0.2-1.9)%, Percentage of Organic Matter Content (ORG) is between (0.03-0.06)%, Total soluble salts (T.S.S.) between (0.9-2.7)%, Gypsum content between (0.25-0.67)% and chloride content between (0.034-0.08)%. The results shows that number of vales (N) of standard penetration test (SPT) is between (4-48) blow and elevation of water table is between (0.3-1.3)m below natural ground surface (N.G.S). The moisture content (M.C) is between (19%-34%) of samples weight. Specific gravity is between (2.67-2.76). Results of analysis of grain size distribution indicate that the majority contents of soil profile consist of silt, sand and clay and this ratios are fluctuating with depth , also results indicates that the percentages of gravel content is between (0-7)%, clay content is between (10%-66%), silt content is between (14%-70%), and sand content is between (4%-74%). Liquid limit (L.L)of soil is between (28%-6١%),Plastic limit (PL) is between (20-39)% and the plasticity index (P.I) is (4%-26%). The average value of soil activity was between (0.56-0.7) and the soil is classified to non active soil. Results from engineering properties of soil indicates the soil have permeability ranging between(6.1x 10 to 3.3 x10 )cm/sec , compression index (Cc) between (0.06-0.3) for shallow depths, unconfined compression test (qu) between (47-155) Kn/m and the value of (cu) is between (2.6-4.4) ton/m2, and (u) is between (7-11) degree. The dynamic and static methods was used to evaluate bearing capacity of soil and the results indicate that the allowable bearing capacity of soil are ranging between (4.3-7) Ton/m2 in different location in Hilla city . The geotechnical assessment of Hilla city showed that the soil profile consist of clay-silt to silt-clay with small amount of sand below natural ground surface for shallow depths ,therefore soil classified to clay with high and low plasticity limits, and silt with high and low plasticity limits fluctuating with depth and soil needs engineering treatments which depends on project type in some places in Hilla .

1 citations


Cites result from "Foundation analysis and design"

  • ...Bowles ,1984, defined soil activity as a relation between plasticity index to finer clay content, which can expressed as a: Soil Activity = PI/finer less than 0.002 mm In the present study, according to the results of Atterberg limits and grain size analysis, The average ratio of plasticity index…...

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Journal Article
TL;DR: In this article, the interference effect on the vertical load-deformation behavior of a number of equally spaced rafts and piled rafts, placed in the artificially consolidated soft clay was investigated.
Abstract: By using small scale model tests, the interference effect on the vertical load-deformation behavior of a number of equally spaced rafts and piled rafts, placed in the artificially consolidated soft clay was investigated. The effect of spacing (s) among foundations on the results was explored. A new experimental setup was proposed in which uniform load was applied by using steel beam of adequate flexural strength and ball bearings to transfer the vertical load equally on both the foundations. The bearing capacity decreases continuously with decrease in spacing among the foundations. The interference effect becomes further prominent with piled raft foundation. In contrast to decrease in the bearing capacity, with decrease in spacing of foundations, an increase in the foundations settlement associated with the ultimate state of shear failure was observed. The present experimental observations were compared to the results obtained by using PLAXIS. The results of this laboratory investigation will be helpful in finding the minimum spacing between the rafts and piled raft foundation for better performance. Keywords: Piled raft; Model test; soft clay; Interference effect; spacing; PLAXIS

1 citations