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: Numerical analysis of soil-structure-interaction (SSI) of tall reinforced concrete chimneys with piled raft foundation subjected to El Centro ground motion (1940) using finite element method finds that the response in the raft depends on the different parameters of chimney, foundation, and soil.
Abstract: This paper presents numerical analysis of soil-structure-interaction (SSI) of tall reinforced concrete chimneys with piled raft foundation subjected to El Centro ground motion (1940) using finite element method. Seismic analysis in time domain was performed on the basis of direct method of SSI on the three-dimensional SSI system. The chimney, foundation, and soil were assumed to be linearly elastic in the analysis. The stress resultants and settlement of raft of piled raft foundation were evaluated under different soil properties and different geometrical features of raft and chimney. Soil properties were selected based on the shear wave velocity corresponding to sand in the loose to dense range. Chimneys with different elevations of 100 m, 200 m, and 400 m were taken with a ratio of height to base diameter of chimney of 17. Raft of different thickness was considered to evaluate the effect of stiffness of foundation. Results were analysed to assess the significance of characteristic of the ground motion. It is found that the response in the raft depends on the different parameters of chimney, foundation, and soil. It is also found that the higher modes of SSI system are significant in determining the response in the raft.
6 citations
Journal Article•
TL;DR: In this article, analiza ta została przeprowadzona przy użyciu metody elementów skończonych.
Abstract: S t r e s z c z e n i e W pracy przedstawiono wyniki analizy numerycznej wpływu kąta dylatancji na rozkład naprężeń za ścianą oporową. Analiza ta została przeprowadzona przy użyciu metody elementów skończonych. Do opisu zachowania gruntu użyto modelu spręży sto-idealnie plastycznego z kryterium zniszczenia Coulomba-Mohra. Uwzględniono dwanaście przypadków z różnymi wartościami kąta tarcia wewnętrznego ’ (30°, 36° lub 42°) i stosunkiem α między wartościami kąta dylatacji ’ i ’ (0, 1/3, 2/3 lub 1). Analiza wykazała, że wpływ wybóru wartości kąta dylatacji obserwowano głównie w najniższej części ściany oporowej, gdzie ciśnienie działające na ścianki jest najwyższa. Powstałe maksymalne naprężenie może być tam nawet o 30% wyższe gdy α zmienia się od 1 do 0, co jest prawdopodobnie głównym powodem obserwowanej niższej nośności lub rozbieżności obliczeń w przypadkach gdy różnica między ’ i ’ jest większa niż 20°. K e y w o r d s : Dilatancy angle; Internal angle of friction; Gravity retaining wall; Coulomb-Mohr model; Stress distribution; Numerical FEM analysis. 1/2015 A R C H I T E C T U R E C I V I L E N G I N E E R I N G E N V I R O N M E N T 77 A R C H I T E C T U R E C I V I L E N G I N E E R I N G E N V I R O N M E N T The Si les ian Univers i ty o f Technology No. 1/2015
6 citations
Cites background from "Foundation analysis and design"
...of the wall should achieve some critical value, which in a real case may not occur [3, 4]....
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31 May 2016
TL;DR: A new model for the design of rectangular combined boundary footings with two restricted opposite sides, taking into consideration the real pressure of the ground on the contact surface of the footing in order to obtain: the moments around the longitudinal axes parallel to axis "Y-Y", the moment around the transversal axis parallel to the “X-X” axis; the unidirectional shear force (Flexural shearing); and the bi-directional shearing force (penetration shearing) for the two columns as discussed by the authors.
Abstract: A new model for the design of rectangular combined boundary footings with two restricted opposite sides ABSTRACT This document presents a new model for the design of rectangular combined boundary footings with two restricted opposite sides, taking into consideration the real pressure of the ground on the contact surface of the footing in order to obtain: the moments around the longitudinal axes parallel to axis “Y-Y”; the moments around the transversal axes parallel to the “X-X” axis; the unidirectional shear force (Flexural shearing); and the bi-directional shear force (penetration shearing) for the two columns. The real pressure of the ground is presented in terms of the mechanical elements that act on each column (P, Mx, and My). The mathematical approach suggested in this work gives results with a tangible preciseness in order to find the most economical solution. Keywords: footing design; rectangular combined boundary footings; moments; unidirectional shearing force (flexural shearing); bi-directional shearing force (penetration shearing). Un nuevo modelo para diseno de zapatas combinadas rectangulares de lindero con dos lados opuestos restringidos RESUMEN Este documento presenta un nuevo modelo para diseno de zapatas combinadas rectangulares de lindero con dos lados opuestos restringidos tomando en cuenta la presion real del suelo sobre la superficie de contacto de la zapata para obtener: Los momentos alrededor de ejes longitudinales paralelos al eje “Y-Y”; Los momentos alrededor de ejes transversales paralelos al eje “X-X”; La fuerza cortante unidireccional (Cortante por flexion); La fuerza cortante bidireccional (Cortante por penetracion) para las dos columnas. La presion real del suelo se presenta en funcion de los elementos mecanicos que actuan en cada columna (P, Mx, y My). El enfoque matematico sugerido en este trabajo produce resultados que tienen una exactitud tangible para encontrar la solucion mas economica. Palabras clave: diseno de zapatas; zapatas combinadas rectangulares de lindero; momentos; fuerza cortante unidireccional (cortante por flexion); fuerza cortante bidireccional (cortante por penetracion). Um novo modelo para o projeto de sapatas associadas retangulares de divisa com dois lados opostos restringidos RESUMO Este trabalho apresenta um novo modelo a design de footings combinadas retangulares de fronteira com dois lados opostos restringidas, tendo em conta a pressao real do solo na superficie de contato do o footing para obter: Os momentos em torno eixos longitudinais paralelos ao eixo “Y-Y”; Os momentos em torno eixos transversais paralelos ao eixo “X-X”; A forca ao cisalhante em um endereco (corte em flexao); A forca ao cisalhante em dois enderecos (puncoamento) para as duas colunas. A pressao real do solo e apresentada em termos de elementos mecânicos que actuam em cada coluna (P, Mx, e My). A abordagem matematica sugerido neste trabalho produz resultados que tem uma precisao tangivel para encontrar a solucao mais economica. Palavras-chave: design de footings; footings combinadas retangulares de fronteira; momentos; forca ao cisalhante em um endereco (corte em flexao); forca ao cisalhante em dois enderecos (puncoamento).
6 citations
Cites background from "Foundation analysis and design"
...Las cimentaciones se clasifican en superficiales y profundas, las cuales presentan importantes diferencias en cuanto a su geometría, al comportamiento del suelo, a su funcionalidad estructural y a sus sistemas constructivos (Bowles, 1996; Nilson, 1999; Das et al., 2006)....
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...La distribución de la presión será uniforme, si el centroide de la zapata coincide con la resultante de las cargas aplicadas, como se muestra en la Figura 1(c) (Bowles, 1996; Nilson, 1999)....
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...Las cimentaciones superficiales, cuyos sistemas constructivos generalmente no presentan mayores dificultades pueden ser de varios tipos, según su función: zapata aislada, zapata combinada, zapata corrida o losa de cimentación (Bowles, 1996; Das et al., 2006)....
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01 Jan 2010
TL;DR: In this paper, the use of spread footings bearing on competent natural soils, improved soils, and engineered fill materials as a routine alternative to deep foundations for support of bridges by addressing the factors identified above.
Abstract: The Federal Highway Administration (FHWA) believes that spread footings on soils are underutilized because designers encounter one or more of the following obstacles: (a) limited knowledge of American Association of State Highway and Transportation Officials (AASHTO)/FHWA technical references that pertain to spread footings on soils to support bridges; (b) limited knowledge of adequate performance data for spread footings; (c) unrealistic tolerable settlement criteria; (d) overestimation of loads used to calculate settlement; and (e) the use of conservative settlement prediction methods. These obstacles have resulted in institutional biases and overly conservative and excessively costly institutional processes that lead to the unnecessary use of costlier deep foundation systems. The primary goal of this report is to promote the use of spread footings bearing on competent natural soils, improved soils, and engineered fill materials as a routine alternative to deep foundations for support of bridges by addressing the factors identified above. Documented performance data is used to make this case. The report also presents powerful concepts such as construction-point analysis and angular distortions to demonstrate the efficacy of using spread footings. Implementation of these concepts requires only that conventional computations be taken one step further without any requirement for advanced computational skills. The report presents sources of information that agencies and designers can use as references in their project applications. The report contains comprehensive appendices that treat in detail many of the topics discussed in the report. For example, one such appendix provides an introduction to Load and Resistance Factor Design (LRFD) that permits a rational approach to the consideration of spread footings on soils as a feasible alternative to deep foundations.
6 citations
TL;DR: In this paper, the authors quantify the influence of geomorphology as a conditioning factor in slope stability via analysis based on a finite element method with an elastoplastic constitutive model.
Abstract: Landslide occurrence is associated with some conditioning factors and triggering landslide processes. This research contributes to quantify the influence of geomorphology as a conditioning factor in slope stability, via analysis based on a finite element method with an elastoplastic constitutive model. The analysis performs through a numerical simulation with nine three-dimensional slope models. The spatial variation of the stress tensor and its components were obtained by the invariants that reflect the influence of the geoform and flow regime in slope stability. Finally, the authors calculated an index potential failure that quantifies, in a unified manner, the influence of the confinement pressure and shear stress in the slope to determine a susceptibilty failure area.
6 citations
Cites background from "Foundation analysis and design"
...Los parámetros del modelo constitutivo elasto-plástico se definieron con base en valores típicos de arenas limosas propuestos por Puri y Bowles [10-11] (tabla 1)....
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...[11] L. E. Bowles, “Foundation analysis and design”....
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