Author: S. K. HaighPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Effects of Earthquake-induced Liquefaction on Pile Foundations in Sloping Ground
Author: S. K. HaighDesign of Pile Foundations in Liquefiable Soils
Author: Gopal MadabhushiPublisher: Imperial College Press
ISBN: 1848163630
Category : Science
Languages : en
Pages : 232
Book Description
Pile foundations are the most common form of deep foundations that are used both onshore and offshore to transfer large superstructural loads into competent soil strata. This book provides many case histories of failure of pile foundations due to earthquake loading and soil liquefaction. Based on the observed case histories, the possible mechanisms of failure of the pile foundations are postulated. The book also deals with the additional loading attracted by piles in liquefiable soils due to lateral spreading of sloping ground. Recent research at Cambridge forms the backbone of this book with the design methodologies being developed directly based on quantified centrifuge test results and numerical analysis. The book provides designers and practicing civil engineers with a sound knowledge of pile behaviour in liquefiable soils and easy-to-use methods to design pile foundations in seismic regions. For graduate students and researchers, it brings together the latest research findings on pile foundations in a way that is relevant to geotechnical practice. Sample Chapter(s). Foreword (85 KB). Chapter 1: Performance of Pile Foundations (4,832 KB). Contents: Performance of Pile Foundations; Inertial and Kinematic Loading; Accounting for Axial Loading in Level Ground; Lateral Spreading of Sloping Ground; Axial Loading on Piles in Laterally Spreading Ground; Design Examples. Readership: Researchers, academics, designers and graduate students in earthquake engineering, civil engineering and ocean/coastal engineering.
State of the Art and Practice in the Assessment of Earthquake-Induced Soil Liquefaction and Its Consequences
Author: National Academies of Sciences, Engineering, and MedicinePublisher:
ISBN: 9780309440271
Category :
Languages : en
Pages : 350
Book Description
Earthquake-induced soil liquefaction (liquefaction) is a leading cause of earthquake damage worldwide. Liquefaction is often described in the literature as the phenomena of seismic generation of excess porewater pressures and consequent softening of granular soils. Many regions in the United States have been witness to liquefaction and its consequences, not just those in the west that people associate with earthquake hazards. Past damage and destruction caused by liquefaction underline the importance of accurate assessments of where liquefaction is likely and of what the consequences of liquefaction may be. Such assessments are needed to protect life and safety and to mitigate economic, environmental, and societal impacts of liquefaction in a cost-effective manner. Assessment methods exist, but methods to assess the potential for liquefaction triggering are more mature than are those to predict liquefaction consequences, and the earthquake engineering community wrestles with the differences among the various assessment methods for both liquefaction triggering and consequences. State of the Art and Practice in the Assessment of Earthquake-Induced Soil Liquefaction and Its Consequences evaluates these various methods, focusing on those developed within the past 20 years, and recommends strategies to minimize uncertainties in the short term and to develop improved methods to assess liquefaction and its consequences in the long term. This report represents a first attempt within the geotechnical earthquake engineering community to consider, in such a manner, the various methods to assess liquefaction consequences.
Liquefaction-induced Lateral Spreading and Its Effects on Pile Foundations
Author: Liangcai HeSingle Piles in Liquefiable Ground
Author: Rui WangPublisher: Springer
ISBN: 3662496631
Category : Science
Languages : en
Pages : 131
Book Description
This thesis focuses on the seismic response of piles in liquefiable ground. It describes the design of a three-dimensional, unified plasticity model for large post-liquefaction shear deformation of sand, formulated and implemented for parallel computing. It also presents a three-dimensional, dynamic finite element analysis method for piles in liquefiable ground, developed on the basis of this model,. Employing a combination of case analysis, centrifuge shaking table experiments and numerical simulations using the proposed methods, it demonstrates the seismic response patterns of single piles in liquefiable ground. These include basic force-resistance mode, kinematic and inertial interaction coupling mechanism and major influence factors. It also discusses a beam on the nonlinear Winkler foundation (BNWF) solution and a modified neutral plane solution developed and validated using centrifuge experiments for piles in consolidating and reconsolidating ground. Lastly, it studies axial pile force and settlement during post-earthquake reconsolidation, showing pile axial force to be irrelevant in the reconsolidation process, while settlement is process dependent.
Pile Foundations in Liquefied and Laterally Spreading Ground During Earthquakes
Author: Ross W. BoulangerPublisher:
ISBN:
Category : Earthquake engineering
Languages : en
Pages : 210
Book Description
Design of Pile Foundations in Liquefiable Soils
Author: Gopal MadabhushiPublisher: World Scientific
ISBN: 1848163622
Category : Science
Languages : en
Pages : 232
Book Description
Pile foundations are the most common form of deep foundations that are used both onshore and offshore to transfer large superstructural loads into competent soil strata. This book provides many case histories of failure of pile foundations due to earthquake loading and soil liquefaction. Based on the observed case histories, the possible mechanisms of failure of the pile foundations are postulated. The book also deals with the additional loading attracted by piles in liquefiable soils due to lateral spreading of sloping ground. Recent research at Cambridge forms the backbone of this book with the design methodologies being developed directly based on quantified centrifuge test results and numerical analysis.The book provides designers and practicing civil engineers with a sound knowledge of pile behaviour in liquefiable soils and easy-to-use methods to design pile foundations in seismic regions. For graduate students and researchers, it brings together the latest research findings on pile foundations in a way that is relevant to geotechnical practice.
Effects of Liquefaction on Pile Foundations
Author: John C. HornePublisher:
ISBN:
Category : Bridges
Languages : en
Pages : 146
Book Description
Liquefaction-targeted Ground Motion Parameters
Author: Andrew J. MakdisiPublisher:
ISBN:
Category :
Languages : en
Pages : 340
Book Description
Earthquake-induced ground failure, resulting from liquefaction of loose sand and soft clay deposits, has caused tremendous damage to the built and natural environment. Ground failures due to lateral spreading, an effect of soil liquefaction at sites on mildly sloping ground or in close proximity to natural or man-made free faces, has been observed to pose significant risks to bridge pile foundations, underground utilities, and shallow foundation systems. Conventional design guidelines in the United States are typically centered on analysis of the liquefaction triggering limit state, by computing a factor of safety (FSL) that considers a single, probabilistic level of earthquake ground shaking. When compared with fully probabilistic analyses of liquefaction triggering that consider all levels of ground shaking, conventional analyses may result in inconsistent representations of the actual liquefaction hazard in different regions of the U.S. Furthermore, analyses that focus on the triggering limit state, rather than the effects of liquefaction (i.e. ground deformations), are generally insufficient in predicting physical damage and losses, particularly in probabilistic frameworks. In this study, a computational platform for fully probabilistic liquefaction hazard analysis (PLHA) is developed and utilized to evaluate the degree to which conventional liquefaction hazard analyses deviate from the actual liquefaction hazard for the triggering limit state. A comparison study between PLHA-based and conventional estimates of FSL indicates a large degree of inconsistency both at the regional and national scale, with some parts of the U.S. designing for nearly three times the implied hazard as others when using conventional analyses. To address this inconsistency, a framework is presented for mapping a liquefaction-targeted ground motion intensity measure for a reference soil and site condition, that, in conjunction with site-adjustment factors can be used in conventional analyses to obtain hazard-consistent estimates of FSL. The framework is validated for a range of geographic locations, seismotectonic environments, soil parameters, and site conditions. Finally, recognizing the need to focus on the effects of liquefaction, a large-scale, simulation-based parametric study, consisting of nonlinear finite-element dynamic analyses performed via a high-performance computing platform, is presented for investigating the physical mechanisms that contribute to lateral spreading-type ground failures. The results of this study are used to develop and present a probabilistic framework for predicting post-triggering ground deformations that accounts for the time of liquefaction during during earthquake motions, as well as system-level effects such as the reduction in seismic demands due to liquefaction in deeper soil strata.
Safety and Reliability: Methodology and Applications
Author: Tomasz NowakowskiPublisher: CRC Press
ISBN: 113802709X
Category : Technology & Engineering
Languages : en
Pages : 266
Book Description
Within the last fifty years the performance requirements for technical objects and systems were supplemented with: customer expectations (quality), abilities to prevent the loss of the object properties in operation time (reliability and maintainability), protection against the effects of undesirable events (safety and security) and the ability to restore performance (resilience). The need to adapt the operation of complex systems in such an uncertain and volatile environment has caused the necessity to formulate new and well established achievements associated with modeling, testing and evaluation of these properties. The concept of a complex system applies not only to the technical ones but also the infrastructure of major importance for social life such as transportation and logistics systems, buildings, power systems, water distribution systems or health services. Safety and Reliability: Methodology and Applications contains the proceedings of the 24th European Safety and Reliability Conference (ESREL 2014, Wroclaw, Poland, 14-18 September 2014), and discusses theories and methods and their applications in the areas of risk, safety and reliability. The abstracts book (408 pages) + full paper CD-ROM (2496 pages) will be of interest to researchers and practitioners, academics and engineers working in academic, industrial and governmental sectors.