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
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TL;DR: In this article, a finite element limit analysis method based on continuous asymmetric failure criterion as a nonlinear function of confining stress and initial soil density, and considering non-associated flow rule has been presented.
Abstract: In this paper, formulation of upper bound finite element limit analysis method based on continuous asymmetric failure criterion as a nonlinear function of confining stress and initial soil density, and considering non-associated flow rule has been presented. The optimization procedure was performed based on nonlinear quasi-Newton algorithm. In this regard, the primary kinematic fields were derived from the linear programming considering the Mohr–Coulomb criterion and the initial stress fields was obtained using classical finite element method. Then, the proposed formulation was applied to estimating the bearing capacity of strip footing located on slope. The results of analyses obtained through proposed formulation were compared with the other analytical methods particularly, those explored based on Mohr–Coulomb failure criteria and considering non-associated flow rule by soil shear strength parameters reduction. Based on the obtained results, for given geometry and boundary condition of slope and footing, the bearing capacity is affected by type of considered dilatancy relation of soil, nonlinear dependence of failure surface on stress level, and soil initial density. For a given internal friction angle, the difference between limit loads obtained by applying nonlinear and linear (Mohr–Coulomb) failure criterions, depends on slope angle. For low slope angle, bearing capacity from nonlinear criterion is more than that from linear criterion.
Dissertation•
01 May 2011
TL;DR: The most commonly used types of shallow foundations are isolated footings, strap footings and combined footings as discussed by the authors and the input data for these macros can be in EXCEL format.
Abstract: The most commonly used types of shallow foundations are isolated footings, strap footings and
combined footings. A team of expertise involving engineers, draftspersons, quantity surveyors,
and others frequently do the tasks of designing, drawing, and quantifying shallow foundations.
Design of shallow foundations is usually performed using spreadsheet programs. Quantity
surveyors are also aided by Microsoft Excel to quantify structures. Working drawing is most of
the time prepared by using the software AutoCAD.
Most of the times, information is transferred from engineers to drafts person by using sketches.
And quantity surveyors use the drawings developed to quantify structures.
AutoCAD can be manipulated programmatically by using macros. Macros which can produce
working drawings for isolated, strap, and combined footings can be developed. And the input
data for these macros can be in EXCEL format.
The purpose of this thesis is to develop EXCEL spreadsheet programs and AutoCAD macros
which aid the engineer, the draftsperson and the quantity surveyor design, draw and quantify
isolated or strap or combined footings.
Three spreadsheet programs named “Isolated.xls”, “Combined.xls” and “Strap.xls” are
developed to analyze and design shallow foundations. As a final product, brief design report can
be printed from these spreadsheets and take off sheet is automatically produced in a separate
sheet. Besides, three AutoCAD macros named “Isolated.dvb”, “Combined.dvb” and “Strap.dvb”
are developed to produce working drawings. The input data for the AutoCAD macro can be
simply copied from the Excel spreadsheet programs.
07 Dec 2020
TL;DR: In this article, the interaction coefficient (Ci) of a mechanically stabilized earth (MSE) wall for riverbank protection, quays, sea walls and other waterfront structures was determined in a submerged condition, on top of the Ci in a non-submerged condition for different types of geogrid reinforcement.
Abstract: The design and evaluation of mechanically stabilized earth (MSE) wall structures for riverbank protection, quays, sea walls and other waterfront structures is critically dependent on a design parameter called the interaction coefficient (Ci) for submerged or fully saturated condition. However, the available research works conducted in this field are limited to non-submerged and, at most, partially saturated condition. This limitation does not closely represent actual conditions where waterfront structures are almost often submerged and fully saturated. Hence, the objective of this study was to determine the Ci in a submerged condition, on top of the Ci in a non-submerged condition for different types of geogrid reinforcement for fine-grained soils and coarsegrained soils used for MSE walls. Test results revealed that the Ci decreased as the effective overburden stress increased. The submerged conditions yielded lower Ci compared with non-submerged conditions, and the reduction wassignificant at a lower effective overburden stress for high density polyethylene uniaxial geogrid than the polyvinyl coated polyester yarn. The design parameters derived from these conditions can be used for the evaluation and design of MSE walls for waterfront applications with a higher level of confidence.
Cites methods from "Foundation analysis and design"
...Also, the procedure in the design and evaluation of saturated or submerged MSE walls in research studies of Bowles (1997), Jewell (1996), Koerner (2005), and the U.S. Department of Transportation and Federal Highway Administration (2001) adopted the effective stress principle....
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30 Jan 2013
TL;DR: In this paper, it was shown that frekuensi ying dihasilkan and amplitudo ying terjadi dari mesin, bisa bisa mengetahui ukuran kelayakan dari suatu pondasi mesin.
Abstract: Untuk merencanakan pondasi mesin, pada umumnya membutuhkan data-data dari mesin tersebut, meliputi letak titik berat mesin tersebut dan frekuensi yang dihasilkan mesin tersebut. Dari letak titik berat mesin, kita bisa mengetahui pengaruh beban dinamis terhadap letak garis kerjanya. Dari frekuensi yang dihasilkan dan amplitudo yang terjadi dari mesin, kita bisa bisa mengetahui ukuran kelayakan dari suatu pondasi mesin. Karena frekuensi dan amplitudo yang terjadi, seringkali menimbulkan efek yang bervariasi, mulai dari ketidaknyamanan yang dirasakan oleh manusia yang berada di dekat mesin sampai kerusakan struktural serta kerusakan pada mesin itu sendiri.
Namun pada kasus pondasi turbin di Duri, Riau ini. Data-data dari mesin tidaklah lengkap, karena itu perlu dilakukan studi pengaruh beban dinamis pada perencanaan pondasi tersebut agar mengetahui parameter apakah yang paling berpengaruh terhadap perencanaan pondasi tersebut. Studi pengaruh dilakukan terhadap pengaruh dari berat rotor, elevasi titik berat mesin, tebal pondasi dan posisi generator dan turbin pada momen rocking arah panjang.
Hasil dari perencanaan ulang pondasi turbin dengan berat rotor turbin 20% dari Wturbin, berat rotor generator 16% dari Wgenerator, elevasi titik berat mesin 1,4 meter, serta tebal pondasi 1,6 meter, didapatkan amplitudo yang terjadi sebesar 0,00032265 inch untuk vertikal (<30μm) dan 0,0004399 inch untuk horizontal (<50μm). Hasil di atas digunakan sebagai acuan dalam melakukan studi pengaruh. Studi pengaruh dilakukan dengan menambahkan atau mengurangi besar parameter yang digunakan, yaitu berat rotor, elevasi titik berat mesin dan penebalan pondasi. Setelah dilakukan studi pengaruh terhadap parameter tersebut, didapatkanlah bahwa berat rotor yang paling berpengaruh dalam perencanaan pondasi turbin di Duri, Riau ini.
01 Oct 2011
TL;DR: In this article, the effect of wave loads on the internal forces induced in the submerged piles was studied. And the results were summarized in curves to highlight the impact of each factor.
Abstract: This paper studies the effect of wave loads on the submerged piles. The submerged piles are used widely in harbors, and offshore structures.The bottom part of the pile is buried in soil under the mud line while the upper part (free height of the pile above the mud line) is subjected to waves. The internal forces induced in the pile depend on many factors such as, pile diameter, soil type, water depth, wave period and height. A numerical model for a submerged pile was developed using a commercial Finite Element program to study the internal forces induced on submerged piles which subjected to wave action. The factors affecting the internal forces induced in the pile, due to the wave load, were studied. In the present research, range of different values for each factor was taken into consideration to establish the effect of each factor on the internal forces induced in the pile. The results were summarized in curves to highlight the effect of each factor.
Cites background or methods from "Foundation analysis and design"
...For cohesive soil with Kh does not increase with depth, the values of the lateral subgrade reaction were taken 2087, 3544, and 5000 t/m3 for soft, soft to medium and medium clay, respectively [8]....
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...Lateral subgrade reaction of soil = 5000 t/m3 was used (to model a pile embedded in clay [8]) to study the effect of the different factors except the soil type....
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