Download or read book Evaluation of the Relative Influence of Major Parameters for Laterally Loaded Piles by Three Dimensional Finite Element Models written by Chine-Feng Shie and published by . This book was released on 1992 with total page 710 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Single Piles and Pile Groups Under Lateral Loading written by Lymon C. Reese and published by CRC Press. This book was released on 2010-12-15 with total page 529 pages. Available in PDF, EPUB and Kindle. Book excerpt: The complexities of designing piles for lateral loads are manifold as there are many forces that are critical to the design of big structures such as bridges, offshore and waterfront structures and retaining walls. The loads on structures should be supported either horizontally or laterally or in both directions and most structures have in common t

Download or read book Three dimensional Finite Element Model for Laterally Loaded Piles written by Manish Kumar and published by . This book was released on 1990 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dissertation Abstracts International written by and published by . This book was released on 2007 with total page 902 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Analysis of Laterally Loaded Piles in Multilayered Soil Deposits written by Dipanjan Basu and published by Purdue University Press. This book was released on 2007-10-01 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report focuses on the development of a new method of analysis of laterally loaded piles embedded in a multi-layered soil deposit treated as a three-dimensional continuum. Assuming that soil behaves as a linear elastic material, the governing differential equations for the deflection of laterally loaded piles were obtained using energy principles and calculus of variations. The differential equations were solved using both the method of initial parameters and numerical techniques. Soil resistance, pile deflection, slope of the deflected pile, bending moment and shear force can be easily obtained at any depth along the entire pile length. The results of the analysis were in very good agreement with three-dimensional finite element analysis results. The analysis was further extended to account for soil nonlinearity. A few simple constitutive relationships that allow for modulus degradation with increasing strain were incorporated into the analysis. The interaction of piles in groups was also studied.

Download or read book Dynamic Response of Laterally loaded Piles written by Punchet Thammarak and published by . This book was released on 2009 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: The laterally-loaded pile has long been a topic of research interest. Several models of the soil surrounding a pile have been developed for simulation of lateral pile behavior, ranging from simple spring and dashpot models to sophisticated three-dimensional finite-element models. However, results from the available pile-soil models are not accurate due to inherent approximations or constraints. For the springs and dashpots representation, the real and imaginary stiffness are calculated by idealizing the soil domain as a series of plane-strain slices leading to unrealistic pile behavior at low frequencies while the three-dimensional finite-element analysis is very computationally demanding. Therefore, this dissertation research seeks to contribute toward procedures that are computationally cost-effective while accuracy of the computed response is maintained identical or close to that of the three-dimensional finite-element solution. Based on the fact that purely-elastic soil displacement variations in azimuthal direction are known, the surrounding soil can be formulated in terms of an equivalent one-dimensional model leading to a significant reduction of computational cost. The pile with conventional soil-slice model will be explored first. Next, models with shear stresses between soil slices, including and neglecting the soil vertical displacement, are investigated. Excellent agreement of results from the proposed models with three-dimensional finite-element solutions can be achieved with only small additional computational cost.

Download or read book Three dimensional Non linear Finite Element Analysis of Laterally Loaded Piles in Clay written by Sujit Kumar Bhowmik and published by . This book was released on 1991 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt: Behavior of laterally loaded single piles and pile groups in fine grained soils are investigated using a non-linear finite element methodology. The purpose is to gather behavioral information that would help improve our knowledge of pile behavior and enhance the applicability of some existing methods of analysis. A three-dimensional non-linear finite element program, PILE3D, has been developed. An anisotropically hardening bounding surface plasticity model is used to model soil behavior. Behavior of soil-pile interface is modeled using thin isoparametric elements. Various geotechnical loading and boundary conditions including drained and undrained loading, water table, in-situ stresses, preconsolidation and formation of gap at the soil-pile interface, have been implemented. Two full-scale laterally loaded pile tests are analyzed using two- and three-dimensional idealizations and results are compared with observed pile behavior. Good agreement is obtained between measured and computed bending moment, soil resistance and lateral deflection along the length of the pile, load-deflection response at the pile-head and p-y curves at different depths. Influence on the behavior of the pile-soil system of flexural rigidity and diameter of the pile, shear strength, lateral pressure coefficient, friction angle and preconsolidation of the soil, and gap formation behind the pile at the soil-pile interface are investigated. Results are compared with some existing criteria for the determination of p-y curves. Effect of interaction between the individual piles in a group is studied using three different configurations: (i) an $infty$ x 1 group, (ii) a 1 x $infty$ group and (iii) an $infty$ x $infty$ group. Influence of spacing between the piles in a group is investigated. Results are compared with some existing theoretical solutions and with results of full-scale and model-scale pile load tests. Interactions factors are developed to adjust single pile p-y curves to account for group interaction.

Download or read book Advances in Materials Research written by G. Kumaresan and published by Springer Nature. This book was released on 2021-02-04 with total page 1231 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book comprises select peer-reviewed proceedings of the International Conference on Advances in Materials Research (ICAMR 2019). The contents cover latest research in materials and their applications relevant to composites, metals, alloys, polymers, energy and phase change. The indigenous properties of materials including mechanical, electrical, thermal, optical, chemical and biological functions are discussed. The book also elaborates the properties and performance enhancement and/or deterioration in order of the modifications in atomic particles and structure. This book will be useful for both students and professionals interested in the development and applications of advanced materials.

Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1988 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book American Doctoral Dissertations written by and published by . This book was released on 1991 with total page 724 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Modeling Pile Behavior in Large Pile Groups Under Lateral Loading written by Andrew Mason Dodds and published by . This book was released on 2007 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Three Dimensional Finite Element Analysis of the Pile Foundation Behavior in Unsaturated Expansive Soil written by Xingyi Wu and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Expansive soils, which are widely referred to as problematic soils are extensively found in many countries of the world, especially in semi-arid and arid regions. Several billions of dollars are spent annually for maintenance or for repairs to the structures constructed with and within expansive soils. The major problems of expansive soils can be attributed to the volume changes associated with the alternate wetting and drying conditions due to the influence of environmental factors. Pile foundations have been widely accepted by practicing engineers as a reasonably good solution to reduce the damages to the structures constructed on expansive soils. Typically, piles foundations are extended through the active layer of expansive soil to reach the bedrock or placed on a soil-bearing stratum of good quality. Such a design and construction approach typically facilitates pile foundations to safely carry the loads from the superstructures and reduce the settlement. However, in many scenarios, damages associated with the pile foundations are due to the expansion of the soil that is predominantly in the active zone that contributes to the pile uplift. Such a behavior can be attributed to the water infiltration into the expansive soil, which is a key factor that is associated with the soil swelling. Due to this phenomenon, expansive soil typically moves upward with respect to the pile. This generates extra positive friction on the pile because of the relative deformation. If the superstructure is light or the applied normal stress on the head of the piles is not significant, it is likely that there will be an uplift of the pile contributing to the damage of the superstructure. In conventional engineering practice, the traditional design methods that include the rigid pile method and the elastic pile method are the most acceptable in pile foundation design. These methods are typically based on a computational technique that uses simplified assumptions with respect to soil and water content profile and the stiffness and shear strength properties. In other words, the traditional design method has limitations, as they do not take account of the complex hydromechanical behavior of the in-situ expansive soils. With the recent developments, it is possible to alleviate these limitations by using numerical modeling techniques such as finite element methods. In this thesis, a three-dimensional finite element method was used to study the hydro-mechanical behavior of a single pile in expansive soils during the infiltration process. In this thesis, a coupled hydro-mechanical model for the unsaturated expansive soil is implemented into Abaqus software for analysis of the behavior of single piles in expansive soils during water infiltration. A rigorous continuum mechanics based approach in terms of two independent stress state variables; namely, net normal stress and suction are used to form two three-dimensional constitutive surfaces for describing the changes in the void ratio and water content of unsaturated expansive soils. The elasticity parameters for soil structure and water content in unsaturated soil were obtained by differentiating the mathematical equations of constitutive surfaces. The seepage and stress-deformation of expansive soil are described by the coupled hydro-mechanical model and the Darcy's law. To develop the subroutines, the coupled hydro-mechanical model is transferred into the coupled thermal-mechanical model. Five user-material subroutines are used in this program. The user-defined field subroutine (USDFILD) in Abaqus is used to change and transfer parameters. Three subroutines including user-defined material subroutine (UMAT), user-defined thermal material subroutine (UMATHT), and user-defined thermal expansion subroutine (UEXPAN) are developed and used to calculate the stress-deformation, the hydraulic behavior, and the expansion strain, respectively. Except for the coupled hydro-mechanical model of unsaturated expansive soils, a soil-structure interface model is implemented into the user-defined friction behavior subroutine (FRIC) to calculate the friction between soil and pile. The program is verified by using an experimental study on a single pile in Regina clay. The results show that for the single pile in expansive soil under a vertical load, water infiltration can cause a reduction in the pile shaft friction. More pile head load is transferred to the pile at greater depth, which increases the pile head settlement and pile base resistance. In future, the proposed method can also be extended for verification of other case studies from the literature. In addition, complex scenarios can be investigated to understand the behavior of piles in expansive soils.

Download or read book Analysis and Design of Steel Tubular Pile Foundations Embedded in Typical Soils written by Zeinab Bayati and published by . This book was released on 2022 with total page 261 pages. Available in PDF, EPUB and Kindle. Book excerpt: Piles should sustain the axial loads transmitted from the supported structure without failing in bearing capacity and/or undergoing structural damage, as well as limit excessive settlements. This is verified by examining the stability (strength) and serviceability (e.g. permissible settlements) of the pile foundation. Classical design frameworks (e.g. the AASHTO LRFD specifications) only address the pile design at the strength limit state, and the pile serviceability is typically checked after determining the design bearing capacity. Therefore, a more comprehensive and practical design framework is required to account simultaneously for the strength and serviceability limit states. An analysis approach based on predicting the load-settlement response can facilitate the incorporation of both strength and serviceability limit states in the routine design of axially loaded pile foundations. The research presented in this dissertation aimed at investigating the strength and serviceability limit states for the analysis and design of axially loaded steel tubular piles. The research was conducted over three major phases of study. The first phase investigated the stability of a pile having tubular steel square section. The model considered buckling of an axially loaded pile entrenched in a continuous medium. Three-dimensional finite element analyses were conducted by modelling partially embedded piles in typical clayey and sandy soils. Three-dimensional analyses were necessary in order to account for the influence of the surrounding soil elastic medium. In order to model the pile section as closely as possible to reality, no particular restrains were imposed on the pile tip. The influence of the pile head restraint, as well as lateral soil support, on the stability of a pile was investigated. Moreover, the effect of the pile-soil interface stiffness on the value of critical buckling load (Pcr) was brought to light for design purposes. The second phase of the study verified the stability of the pile-soil system against failure by considering the nonlinearity of the surrounding soil medium. The serviceability of the pilesoil system was also examined at this stage by means of the pile load-settlement relation in order to certify satisfactory control of the allowable deformations. The objectives of the second phase of the study were met through conducting two levels of analyses: (1) Continuum medium-based finite element analyses, and (2) one-dimensional load transfer analyses. The first level of analyses involved using two- and three-dimensional finite element simulations, that incorporated classical elasto-plastic (Drucker-Prager and Mohr-Coulomb), and nonlinear elastic (Duncan-Chang and Hyperbolic) soil models. The properties of such soils are generally obtained from lab tests. In this context, a new modelling strategy was proposed for the elasto-plastic analysis of steel tubular section piles having sharp corners embedded in a granular (sandy) soil medium. The second level of analyses introduced an approach based on the simultaneous use of the load transfer and finite element analysis methods. In this framework, an elasto-plastic finite element approach was implemented in order to conduct nonlinear finite element analyses with the load-settlement response curve of axially loaded single piles. This was achieved via the nonlinear pile-soil stress-displacement curves along the pile shaft (t-z curve) and a tip (qz curve). The plasticity algorithm considered strain hardening through the pile-soil interaction (t-z and q-z) curves. The load transfer analysis showed a significantly improved characterization for the pile load-settlement behavior compared to field test results. The computation of pile settlement was also improved by reproducing the interaction curves for both pile shaft and pile tip via the use of the so-called “Sublayer” or “Overlay” method. Finally, the third phase aimed at providing a practical design framework accounting simultaneously for the pile strength and serviceability limit states. The design framework accounts for the stability (buckling) of the pile section and can be extended to the design of different types of deep foundations such as steel tubular and concrete piles.

Download or read book Finite Element Analysis of Laterally Loaded Piles written by Dennis Ganendra and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Modern Applications of Geotechnical Engineering and Construction written by Mahdi O. Karkush and published by Springer Nature. This book was released on 2020-12-21 with total page 381 pages. Available in PDF, EPUB and Kindle. Book excerpt: p="" This book contains select papers from the International Conference on Geotechnical Engineering Iraq discussing the challenges, opportunities, and problems of application of geotechnical engineering in projects. The contents cover a wide spectrum of themes in geotechnical engineering, including but not limited to sustainability & geotechnical engineering, modeling of foundations & slope stability, seismic analysis & soil mechanics, construction materials, and construction & management of projects. This volume will prove a valuable resource for practicing engineers and researchers in the field of geotechnical engineering, structural engineering, and construction and management of projects. ^

Download or read book Lateral Load Capacity of Single Piles Socketed Into Melbourne Mudstone written by Wai Loong Chong and published by . This book was released on 2011 with total page 558 pages. Available in PDF, EPUB and Kindle. Book excerpt: Industrial practice often adopts analytical methods developed for soils based on the continuum approach when designing laterally-loaded piles socketed into rock mass. High safety considerations and the uncertainties arising from the assumption of continuum rock mass may produce inefficient and unsafe design solutions to foundation problems subjected to lateral loads. To date, the research in the area of laterally-loaded rock-socketed piles has not been advanced sufficiently. The available analytical methods assume rocks to be intact and homogenous materials, and the physical effect of joints is not taken into account. Therefore, this study aims to develop an analytical method for laterally-loaded piles socketed into rock mass incorporating the physical effect of joints. A three-dimensional distinct element code, 3DEC, was utilised to simulate the behaviour of laterally-loaded piles socketed into mudstone rock. The capability of 3DEC to model jointed rock mass was first examined by simulating the confined (triaxial) and unconfined (uniaxial compressive test) loading conditions. The results obtained from this modelling were compared with existing empirical relationships and field test data. 3DEC was then employed to simulate laboratory-scale model pile-load tests. A comprehensive parametric study was carried out based on the calibrated laboratory 3DEC model. It was found that the most influential parameters impacting the lateral behaviour of piles socketed into jointed mudstone are rock modulus, pile diameter, pile bending stiffness, pile socket length, joint dip angle and spacing. Based on the understanding of the key influential parameters affecting lateral load behaviour, 3DEC modelling was extended further to simulate full-scale pile load tests conducted in Melbourne mudstone. Based on extensive numerical modelling, the p-y behaviour of piles socketed into mudstone was derived. It was found that a single p-y curve for mudstone accurately predicts pile-head load-deflection behaviour. Subsequently, a thorough parametric study based on full-scale models was carried out to study the effect of joints on the lateral load capacity of piles. This study found that joint sets in different directions have a significant impact on the p-y and the corresponding pile-head load-deflection behaviour. The worst-case condition of four joint sets reduces the load-carrying capacity of the pile by more than 90% compared to a homogenous mudstone. This is due to the deformation mechanisms of the pile-rock system such as the formation of weak wedges/pyramid blocks around the pile. The results obtained from the extensive parametric study were integrated in the derivation of new p-y criteria for laterally-loaded piles socketed into homogenous and jointed mudstone rocks. The p-y criteria developed require basic rock properties which can be conveniently obtained in the laboratory or using the well-established empirical relationships for mudstone based on water content. The p-y criterion proposed for homogenous mudstone condition was validated using the results of another two field pile-load tests. For the p-y criterion of jointed mudstone, a field load test of a pile with an apparent steep joint in the vicinity of the pile was employed to validate its accuracy. It was found that the p-y criterion for jointed mudstone gives a slightly more conservative prediction of the pile-head load-deflection response. It is suggested that the p-y criterion for homogenous and jointed mudstone conditions will provide the upper and lower bound solutions, respectively. This study has successfully developed an analytical method for laterally-loaded piles socketed into mudstone. The proposed design approach pioneers the integration of the physical effect of joints on the p-y behaviour of piles socketed into jointed mudstone. The proposed p-y criteria were validated using field pile load tests and very close predictions were achieved.

Download or read book Geotechnical abstracts written by and published by . This book was released on 1986 with total page 890 pages. Available in PDF, EPUB and Kindle. Book excerpt: