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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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01 Jan 2005
TL;DR: A parametric study using a finite element method of analysis is undertaken to investigate the behavior of a new type of anchored earth wall system supporting simultaneously constructed roadway as mentioned in this paper, where the effect of stiffness of reinforcing tendon and backfill soil on the behaviour of the wall system is presented.
Abstract: A parametric study using a finite element method of analysis is undertaken to investigate the behavior of a new type of anchored earth wall system supporting simultaneously constructed roadway. In this paper the effect of stiffness of reinforcing tendon and backfill soil on the behavior of the wall system is presented. It is observed that deformation of wall decreases with increasing stiffness of reinforcement and after certain value of stiffness it has no effect on deformation. On the other hand, anchor force increases with increasing stiffness of reinforcement and after certain value of stiffness it has no effect on anchor force. Deformation decreases with increasing stiffness of backfill and retained soil. Anchor force also decreases with increasing stiffness of backfill but remain constant with variation of stiffness of retained soil. Moderately compacted fill of which elastic modulus is greater than or equal to 10 MPa is sufficient for reinforced zone, provided that stiffness of reinforcement is greater than 5.0x10 6 N/m.

1 citations

Book ChapterDOI
01 Jan 1997
TL;DR: Sheet-pile bulkheads are commonly used in marine engineering and have proven to be a viable and economical solution to waterfront construction, where the wall height does not exceed 18-20 m and the foundation soil permits pile-driving as discussed by the authors.
Abstract: Sheet-pile bulkheads are frequently used in marine engineering. These structures have proven to be a viable and economical solution to waterfront construction, where the wall height does not exceed 18–20 m and the foundation soil permits pile-driving. These walls are usually treated as flexible and are normally distinguished by the material of sheet piles (e.g., wood, steel, or concrete), method of sheet-pile support, and sequence of wall construction.

1 citations

Dissertation
28 Oct 2010
TL;DR: In this paper, a superestrutura reticulada using the metodo dos elementos finitos (MEF) is presented, which is used for interacao solo-estruturamento.
Abstract: Neste trabalho sao descritas analises estatica e dinâmica em regime elastico de estruturas reticuladas utilizando o metodo dos elementos finitos (MEF). A superestrutura e modelada para seis familias de estruturas reticuladas (trelica plana, trelica espacial, portico plano, grelha, portico espacial e portico espacial enrijecido com nucleo estrutural) e elementos finitos especificos sao desenvolvidos para esse fim. Nos casos pertinentes, os efeitos de flexao (segundo as teorias de Euler-Bernoulli e Timoshenko), de torcao (segundo as hipoteses de Saint Venant e Vlasov), sao devidamente explorados e as formas explicitas das matrizes de rigidez, de massa e vetor nodal equivalente sao apresentadas. Um enfoque especial e dado para o problema de interacao solo-estrutura em regime estatico. Nesse caso a superestrutura, que pode ser associada ao portico espacial sem enrijemento por nucleo estrutural, e modelada pelo MEF e o solo (admitido ser um solido elastico semi-infinito) e representado por equacoes integrais compostas e sistematizado algebricamente pelo metodo dos elementos de contorno (MEC). E por fim, os sistemas algebricos do MEF e do MEC sao compatibilizados permitindo assim a analise da interacao solo-estrutura. Outro enfoque do trabalho e o desenvolvimento de um ambiente de simulacao (denominado SAPROMS NET) voltado, principalmente, para as etapas de pre-processamento e processamento. Essas sao implementadas na linguagem orientada a objetos Java. Alguns exemplos numericos sao apresentados, assim como o detalhamento do ambiente de simulacao.

1 citations

01 Jan 2006
TL;DR: In the first week of April 1993, it was observed that the handrails were at a vertical angle in the centre of the bridge, which indicated a sinking of piers P-4 and P-5 as discussed by the authors.
Abstract: The bridge over Guadalquivir river, near Alcala del Rio in Seville (Spain), has nine spans of 30 m with a total length of 270 m. In 1993 two of the central piers located in the centre of the river sank by 140mm and 60mm. The superstructure is isostatic and is formed of six prefabricated concrete T-beams 1500mm high. The foundations for each support are formed of two circular pier-piles with a diameter of 1.5m. The bridge was constructed between July 1990 and October 1992. In the first week of April 1993 it was observed that the handrails were at a vertical angle in the centre of the bridge, which indicated a sinking of piers P-4 and P-5 in the middle of the river. Following topographic observations showed vertical movements of 139mm and 54mm in the two piers. After studying different solutions it was concluded that the best technical and economic remedial option was to use Jet Grouting injections. By using two concentrical circular crowns of nine Jet Grouting injections, with the most interior vertical and the most exterior inclined to the axe of the pier, a kind of superpile of soil-cement was fomed greatly increasing the factor of safety and the most importantly lifting pillars P-4 and P-5 10 cm and 2.5 cm respectively, reducing almost all the angular distortion of the deck. The remedial works were undertaken in 1993.

1 citations

Journal ArticleDOI
TL;DR: In this article, three optimization techniques, Hooke and Jeeves, Fletcher-Reeves and Davidon-Fletcher-Powell, are applied to design of the circular footing adjacent to slopes.
Abstract: The analysis presented here introduces three optimization techniques namely, Hooke and Jeeves, Fletcher-Reeves and Davidon-Fletcher-Powell as applied to design of the circular footing adjacent to slopes. A computer program was developed to solve this design problem using the conventional structural design approach in conjunction with these methods, A simple study was performed to detect the sensitivity of the objective function to its design variables. A further parametric study was performed regarding the geometric configurations of the footing and loading conditions in order to provide the geotechnical engineer with some useful design curves. Hooke and Jeeves method has been proved to be very instructive in exposing the effect of the other methods. It has been proved that the minimum cost of the circular footing increases with the increase of the load whereas it decreases as the angle of internal friction increases and the D cl /B ratio (column diameter/diameter of footing).

1 citations


Additional excerpts

  • ...Cex = /4 * B 2 * DF * Pex ..........(3) Where: DF = embedment depth of footing (m)....

    [...]

  • ...05 x(l) = B, X(2) = T, X(3) = DF, X(4) = b The first initial trial values: X(1)=3, X(2)= 1....

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