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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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TL;DR: In this paper, a nonlinear finite-element procedure was used to analyze plates with linear strain displacement relations resting on nonlinear elastic media, and the coupled problem was formulated using the total potential energy (TPE) concept.
Abstract: Plates resting on an elastic medium are normally analyzed in a simplified way using the linear Winkler foundation approach. Nevertheless, plates resting on layered medium with vast differences in their moduli exhibit nonlinear behavior under pressure. The present technical note deals with a nonlinear finite-element procedure to analyze plates with linear strain displacement relations resting on a nonlinear elastic media. The coupled problem is formulated using the total potential energy (TPE) concept. The nonlinear foundation stiffness matrices have been derived using the Taylor expansion of the TPE at equilibrium and a symbolism of grouping the energy contributions. The nonlinear foundation stiffness matrices derived in the present technical note have been demonstrated to yield results that agree well with published results in the literature. A brief parametric study on the effects of nonlinearity of the foundation is also presented using the proposed foundation stiffness matrices.
5 citations
TL;DR: In this paper, the authors propose a new method for designing laterally loaded piles, which avoids the large number of calculations for specific load cases and focuses instead on underlying system dynamics of vertical and lateral pile resistances and deflections to derive interaction relationships.
5 citations
TL;DR: In this article, Chen et al. presented the response of single pile against excavation induced soil movement by conducting model tests at unit gravity and found that the pile head deflection and bending moment of pile decrease exponentially with increasing distance between the pile and the sheet pile wall supporting the excavation.
Abstract: This paper presents the response of single pile against excavation induced soil movement by conducting model tests at unit gravity. The study involves a series of tests conducted on piles of three L/d ratios 10, 20 and 30 embedded in medium dense sand. From the test results it was found that the pile head deflection and bending moment of pile decrease exponentially with increasing distance between the pile and the sheet pile wall supporting the excavation. Analyses of the test results show that the shorter passive pile (L/d = 10) deflects more when compared to a long pile (L/d = 30) and a point of contraflexure for a long pile occurs in the pile section approximately at a depth close to the depth of excavation. The influence of soil movement on the lateral response of pile is also analysed through 3-dimensional finite element analysis. The numerical results thus obtained are validated with the results of experiments. The Mohr–Coulomb material model adopted to represent the soil characteristics predicts the response of pile reasonably and compares well with the response observed in the 1g model test. Design charts are included to predict pile head deflection and maximum moment in pile for the excavation depth ratio (De/Lr) = 0.5. These charts can be adopted to predict prototype pile behaviour by applying scaling law of Wood (Geotechnical modelling, Spon Press, London, 2001). The results of numerical and 1g model tests are validated with the design methods of Chen and Poulos (J Geotech Geoenviron Eng 123(9):802–811, 1997) and Xu and Poulos (Comput Geotech 28:349–375, 2001) and the design charts proposed in this study for deflection of passive pile and sheet pile wall support system are validated with centrifuge test results of Leung et al. (J Geotech Geoenviron Eng ASCE 126(11):947–954, 2000).
5 citations
Cites result from "Foundation analysis and design"
...The angle of shearing resistance (/0) obtained from the test was 37 for the relative density of 59% and it compares well with the empirical equation /0 = 28 ? 15 RD proposed by Bowles (1997). Uniformity of sand bed prepared by the combination of sand raining and compaction was verified by comparing light cone penetration resistances recorded at four locations of test bed....
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...15 RD proposed by Bowles (1997)....
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TL;DR: In this paper, the collapse behavior of single-layer space barrel vaults with different slope angles is investigated under various types of non-uniform support settlement, and the optimum slope angles of the structures are determined so that it minimizes the destructive effects of the support settlement.
Abstract: Single-layer space barrel vaults are appropriate structures for covering extensive spaces with large spans for which non-uniform support settlement is considered as a great concern. This can affect the stability and collapse behavior of these structures. Accordingly, in this paper, the collapse behavior of the barrel vaults with different slope angles is investigated under various types of the non-uniform support settlement. Both material and geometrical nonlinearity are taken into account while studying the effects of the settlements on the collapse progression in barrel vaults. Finally, the optimum slope angles of the structures are determined so that it minimizes the destructive effects of the support settlement. Moreover, the allowable values of the non-uniform support settlements provided by several code provisions have been investigated in detail.
5 citations
Cites background or methods from "Foundation analysis and design"
...Cao and Zhao (2010) investigated the buckling strength of large vertical cylindrical steel storage tankers under harmonic settlements....
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...Table 3 shows the recommended values for differential and maximum settlements in steel and reinforced concrete constructions (Bowles, 1997)....
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...According to USSR building code (Bowles, 1997), the maximum value of the settlement in steel frames is limited to 100 mm....
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07 Nov 2013
TL;DR: In this article, disencias de mezclas de arcilla de pasta ceramica and ladrillos were used to measure the resistencia de the pasta and the resistencia de the ladrillo.
Abstract: RESUMEN Debido al fisuramiento temprano de paredes solicitadas por efectos gravitacionales, principalmente en viviendas de estratos 1 y 2, y al peligro al que estarian expuestas si se presentara un evento telurico, se realizaron diferentes analisis a fin de caracterizar el material base y con ellos se elaboraron disenos de mezclas de arcilla para mejorar la pasta y la resistencia de los ladrillos; estos fueron quemados en el horno artesanal del tejar y en un horno mufla para observar el cambio en sus propiedades fisica y mecanicas, a efectos de determinar la calidad de las piezas de mamposteria. Estos disenos de mezclas se realizaron adicionando cal y variando los porcentajes de las muestras base segun su composicion quimica y mineralogica hasta alcanzar porcentajes de absorcion de agua, resistencias a la compresion y flexion apropiados; ademas, se determinaron parametros basicos de diseno. Palabras clave: arcilla, caracterizacion, mezclas de arcilla, pasta ceramica, ladrillo.
5 citations