Foundation analysis and design

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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.

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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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Determination of geotechnical properties of seafloor sediment using a free fall penetrometer

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Gopala Krishna Mulukutla

01 Jan 2009

TL;DR: In this article, a study was conducted to determine the penetration behavior of a cylindrical probe free falling to the seafloor and to utilize the data obtained to evaluate the engineering properties of surficial sediment.

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Abstract: DETERMINATION OF GEOTECHNICAL PROPERTIES OF SEAFLOOR SEDIMENT USING A FREE FALL P E N E T R O M E T E R by Gopala Krishna Mulukutla University of New Hampshire, May, 2009 A study was conducted to determine the penetration behavior of a cylindrical probe free falling to the seafloor and to utilize the data obtained to evaluate the engineering properties of surficial sediment. Two experimental probes, each equipped with accelerometers, pressure sensors and optical backscatter sensors were deployed in different sediment regimes. The data collected was used to derive the sediment type and determine physical properties such as undrained shear strength, coefficient of consolidation and shear modulus for soft fine-grained sediment. Acceleration signals from drops of a free fall penetrometer contain information about the nature of the seafloor. A simple sediment classification model was proposed using data from field deployment tests as well as literature.This model, though applicable only to the probes used in this study, presents an approach that can expand the usage of free fall penetrometers. Rapid penetration with rigid probes in saturated sediments usually results in an increase in measured penetration resistance. This effect, called the strain rate effect, xiii was studied for soft fine-grained sediments by formulating a model to determine undrained shear strength profiles. Excess pore pressure dissipation seen in post-arrest pressure sensor signals in fine-grained sediments were studied to predict the coefficient of consolidation and by extension permeability and shear modulus. A dissipation model using a cylindrical cavity expansion method was formulated for this purpose. A field study was conducted to validate the sediment classification model and undrained shear strength models. Field vane shear tests at the location of the probe drops were used to validate the strain rate dependent strength model. This work facilitates the expanded use of free fall penetrometers as part of geotechnical, geophysical and geological studies of the seafloor.

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Cites background from "Foundation analysis and design"

...Terzaghi extended the study with an equation that included soil cohesion, friction and surcharge (Bowles, 1996) qf = cNc + qNq + ^BN^ (2.11) where qf is the ultimate bearing capacity of a infinitely long footing of width B. Nc, Nq and iV7 are empirical bearing capacity factors, q is the surcharge, 7S is unit weight of soil. Numerical methods are used to solve the Equation 2.11 using mechanisms constructed to predict the pattern of failure. Terzaghi also considered additional factors in refining the bearing capacity equation. Those included, surface roughness of the foundation as well as accounting for shapes other than strip footings. qf = cNc£sC + l/2lsBN1Z1 + qNqZ1 (2.12) where £c, £g and £7 are empirical shape factors to extend the use of the equations to footing shapes other than rectangular strips. A number of values for empirical shape factors have been proposed by various researchers based on experimental studies to extend the use of the bearing capacity equation to axisymmetric foundations. In order to determine the solution to Equation 2.12 the values of the bearing capacity factors need to be known. Durgunoglu and Mitchell (1973) used an approach of constructing a failure mechanisms for a wedge lodged at different relative depths and used a rigorous approach to determine the bearing capacity factors...
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...Terzaghi extended the study with an equation that included soil cohesion, friction and surcharge (Bowles, 1996) qf = cNc + qNq + ^BN^ (2....
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Journal Article•DOI•

Overview of Uncertainty in Structural Analysis Assumptions for RC Buildings

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Hassan S. Saffarini¹•Institutions (1)

University of Jordan¹

01 Sep 2000-Journal of Structural Engineering-asce

TL;DR: In this article, the issue of variability in the results of structural analysis in common practice is discussed and the sources of variability are classified into geometric simplification, material modeling, level of sophistication of analysis, and human error.

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Abstract: The issue of variability in the results of structural analysis in common practice is discussed. Discussion is confined to reinforced concrete (RC) buildings. The sources of variability are classified into geometric simplification, material modeling, level of sophistication of analysis, and human error. These are discussed using results from the literature and from illustrative examples. Emphasis is made on the need to incorporate uncertainty of structural analysis in the development of load factors. The LRFD approach is reviewed as it relates to this problem. Studies on human error in structural design are reviewed where correlation is observed between the level of knowledge of designers and reported structural failures. Recommendations given in this paper are motivated by the fact that the proliferation of computers and the availability of powerful software have impacted structural analysis methodology. This is noticeable in the engineering profession, codes of practice, and academia.

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4 citations

Influence of soil-structure interaction on structural behaviour of integral bridge piers

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Damien Dreier¹•Institutions (1)

École Polytechnique Fédérale de Lausanne¹

01 Jan 2008

TL;DR: In this paper, le debut de la recherche au sujet de l'influence of l'interaction sol structure p/r a l'ELS des piles de ponts is described.

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Abstract: Article sur le debut de la recherche au sujet de l'influence de l'interaction sol structure p/r a l'ELS des piles de ponts

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4 citations

Journal Article•DOI•

Bearing behavior of reinforced concrete column-isolated footing substructures

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Wang-Xi Zhang¹, Wang-Xi Zhang², Hao Wu¹, Hyeon-Jong Hwang¹, Jinyi Zhang³, Bao Chen¹, Wei-Jian Yi¹ - Show less +3 more•Institutions (3)

Hunan University¹, Chinese Ministry of Education², Hunan University of Science and Technology³

01 Dec 2019-Engineering Structures

TL;DR: In this article, a test device using rubber-wooden composite blocks to simulate elastic foundation based on Winkler foundation model was designed to evaluate the structural performance and failure mode of reinforced concrete (RC) structures.

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4 citations

Journal Article•DOI•

Numerical Study on the Behaviour of Geocell-Reinforced Sand Layer Overlying Soft Clay Subgrade

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Gaurav Garg and Mamta Juneja, Ravi S. Sharma

18 Nov 2022-Indian Geotechnical Journal

4 citations

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Foundation analysis and design

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