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2018 | Buch

Soil Behavior Kapitel lesen Erstes Kapitel lesen

Soil Dynamics and Foundation Modeling

Offshore and Earthquake Engineering

verfasst von: Prof. Dr. Junbo Jia

Verlag: Springer International Publishing

Enthalten in: Springer Professional "Wirtschaft+Technik" , Springer Professional "Technik" , Springer Professional "Wirtschaft"

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SUCHEN

Über dieses Buch

This book presents a comprehensive topical overview on soil dynamics and foundation modeling in offshore and earthquake engineering. The spectrum of topics include, but is not limited to, soil behavior, soil dynamics, earthquake site response analysis, soil liquefactions, as well as the modeling and assessment of shallow and deep foundations. The author provides the reader with both theory and practical applications, and thoroughly links the methodological approaches with engineering applications. The book also contains cutting-edge developments in offshore foundation engineering such as anchor piles, suction piles, pile torsion modeling, soil ageing effects and scour estimation. The target audience primarily comprises research experts and practitioners in the field of offshore engineering, but the book may also be beneficial for graduate students.

Inhaltsverzeichnis

Frontmatter

Soil Behavior and Dynamics

Frontmatter
Chapter 1. Soil Behavior
Abstract
This chapter briefly presents the background information on soil mechanics.
Junbo Jia
Chapter 2. Dynamic and Cyclic Properties of Soils
Abstract
Response of soil depends on both the mechanical properties of soil itself and the nature of loading.
Junbo Jia
Chapter 3. Site-Response Analysis in Geotechnical Earthquake Engineering
Abstract
Unlike the loads generated by the wind, waves, current, and ice, which are due to the external forces applied on structures, earthquake loads are purely induced by the ground accelerations transferred to the foundation of the structures.
Junbo Jia
Chapter 4. Record Selection for Performing Site-Specific Response Analysis
Abstract
Compare to simplified methods using design codes, site-specific response analysis is a more refined method to determine ground motions.
Junbo Jia
Chapter 5. Soil–Structure Interaction
Abstract
The response of a structure under seismic excitations is affected by interactions between three connected structural parts: the structure, the foundation, and the soil underlying and surrounding the foundation [290].
Junbo Jia
Chapter 6. Seismic Testing
Abstract
To model important dynamic properties of soils for designing of geotechnical structures, various field and laboratory testing techniques are developed.
Junbo Jia
Chapter 7. Liquefaction
Abstract
Liquefaction means the transformation of any substance into a liquid state.
Junbo Jia
Chapter 8. Slope Stability Due to Seismic Loading
Abstract
Slope instability due to earthquakes is one of the most damaging collateral hazards. Earthquakes are the greatest threat to the long-term stability of slopes in earthquake-active regions.
Junbo Jia

Offshore Structures and Earthquake Engineering

Frontmatter
Chapter 9. Offshore Structures and Hydrodynamic Modeling
Abstract
Offshore structures (Fig. 9.1) with their facilities are used to drill wells, to extract and process oil and natural gas, or to temporarily store product until it can be brought to shore for refining and marketing.
Junbo Jia
Chapter 10. Representation of Seismic Ground Motions
Abstract
It is noted that the most important parameters of an earthquake ground motions are its maximum motion, predominant period, and effective durations [524].
Junbo Jia
Chapter 11. Seismic Hazard Assessment
Abstract
Hazard is defined as inherent physical characteristics that pose potential threats to people, property, or the environment.
Junbo Jia

Shallow Foundations

Frontmatter
Chapter 12. Bearing Capacity of Shallow Foundations
Abstract
Foundations are critical components for ensuring stability, transferring loads from structures to base soils or rocks.
Junbo Jia
Chapter 13. Modeling of Shallow Foundation Dynamics
Abstract
Under dynamic loading, elastic waves are generated in soils and the energy is radiated away from the footing. When analyzing a gravity-based foundation structure, it should be noticed that essential differences exist between earthquake and ocean wave loading in that only a small volume of soils close to the foundation is excited under the wave loading, while under significant earthquake loading all surrounding soils are excited, possibly resulting in a softer soil response than that under wave loading.
Junbo Jia

Pile Foundations

Frontmatter
Chapter 14. Introduction to Deep Foundations
Abstract
A deep foundation is a type of foundation that transfers loads from superstructures to the earth a greater depths from the surface than a shallow foundation does to a subsurface layer or a range of depths. Compared to shallow foundations, deep foundations have the merits of being suitable for more adverse soil conditions and less site constraints.
Junbo Jia
Chapter 15. Capacity Control, Modeling of Pile Head Stiffness, and Mitigation Measures to Increase Pile Capacity
Abstract
The capacity of a pile foundation should be considered in all phases of its lifetime, including transportation, lifting, installation
Junbo Jia
Chapter 16. Lateral Force–Displacement of Piles—p-y Curve
Abstract
Many types of loading such as those induced from earthquakes, wind, ocean waves, traffic (bridges), thermal movement, water pressures (dams), and blast loads can generate lateral forces on vertical piles with a direction perpendicular to the axial direction of piles.
Junbo Jia
Chapter 17. Axial Force–Displacement of Piles: t-z and Q-z Curve
Abstract
The load transfer mechanics (side friction and tip resistance from soils) is determined by many factors such as the soil types, the installation method, the pile material and geometry.
Junbo Jia
Chapter 18. Torsional Moment–Rotation Relationship
Abstract
Torsional moments can be introduced on piles due to lateral loadings on the supporting structures. Such lateral loadings can be induced by ship impacts, high-speed vehicle collision, and wind, wave, and current actions on superstructures.
Junbo Jia
Chapter 19. Modeling, Response Calculation, and Design of Piles Under Seismic Loading
Abstract
Soils, foundations, and structures are essentially a coupled system, and among them, foundations work as intermediate media transmitting loading between structures and soils. From the point of view of seismic wave transmission, the seismic wave generated due to the fault rupture is first transferred to far-field soils then to near-field soils surrounding the foundation.
Junbo Jia
Chapter 20. Scour for Pile Foundations
Abstract
Due to the abrasion of the soil surface by the passing of current, wave, and flood, the shear stress generated from the flowing water may exceed the threshold value of the soil erosion resistance (sediment critical shear stress), removing sediment such as sands and rocks from around foundations (such as piles, bridge abutments, or piers).
Junbo Jia
Chapter 21. Effects of Pile Group, Adjacent Structures, and Construction Activities
Abstract
Pile groups or clusters are often used to carry significant loads transferred from superstructures, as shown in Fig. 21.1.
Junbo Jia
Chapter 22. Grout Connections
Abstract
Foundations of offshore jacket structures, which are normally supported by piles, usually include pile clusters that are inserted through and connected to sleeves around the corner legs at the base of the structures.
Junbo Jia
Chapter 23. Vertical Piles Versus Inclined/Battered/Raked Piles
Abstract
Compared to vertical piles (Fig. 14.​1), inclined/battered/raked piles (Fig. 14.​7) generally have higher horizontal stiffness, mainly due to the fact that inclined piles provide partial horizontal resistance from their axial capacity, and the axial stiffness due to pile–soil interaction is normally higher than that along the lateral pile direction (perpendicular to the piles’ axial direction).
Junbo Jia
Chapter 24. Negative (Downward) Friction and Upward Movement
Abstract
If a clay layer(s) is located above or beneath sands, the consolidation process in the clay will introduce a downward drag force, which will apply on piles.
Junbo Jia
Chapter 25. Anchor Piles
Abstract
Anchor piles can transfer both compressive and tensile forces as well as bending moments to the ground, making them ideal as anchors for offshore moorings, basements, and tunnels, etc.
Junbo Jia
Chapter 26. Suction Piles/Caissons
Abstract
A suction pile is a foundation embedded into the sediment at seafloors through either pushing due to the weight of the pile and its associated mass, or creating a negative pressure inside the suction pile.
Junbo Jia
Chapter 27. General Design Issues for Offshore Foundations and Relevant International Codes and Guidelines
Abstract
For different types of offshore foundations categorized as either shallow foundations or deep foundations, various design issues at different stages need to be carefully addressed.
Junbo Jia
Backmatter
Metadaten
Titel
Soil Dynamics and Foundation Modeling
verfasst von
Prof. Dr. Junbo Jia
Copyright-Jahr
2018
Electronic ISBN
978-3-319-40358-8
Print ISBN
978-3-319-40357-1
DOI
https://doi.org/10.1007/978-3-319-40358-8