筒型基础的弹塑性“宏单元”模型研究

发布时间：2024-03-13 22:08

　　目前,人类正在进行许多研究,其目的是向人民提供可再生能源。其中,大量的研究面向风能领域,这些研究的目的是使该地区更的风能资源得到更好地利用。风能工作的一个重要分支是风力涡轮机的安装。通过调查可以为安装风力涡轮机(特别是海上风力涡轮机)提供更多、更优化的安装方法。主要研究的是最佳安装方法中基础的选型。筒型基础技术作为众多基础型式的一种,具有诸多型式,并且越来越广泛地应用于海上风电基础的建设。考虑到岩土,水文和后勤方面的要求,筒型基础正成为安装海上风电基础的一个很好的选择。这就是他们的研究如何使从事设计,分析和安装工作的几位作者感兴趣的原因。在分析筒型基础的特殊情况下,宏观单元法这种新方法是当今非常强大的工具。本文将应用宏单元模型对筒型基础进行分析。分析将使用2D和三个自由度模型来突出关于应用宏单元来分析筒型基础的某些细节。关于承载能力的细节,主要包括由施加的加载系统引起的位移计算,并给出吸力筒长度与其直径比(纵横比)的影响以及土体类型的影响。前一段时间,宏观单元法仅用于获得给定加载系统下土体-结构相互作用的近似响应,它唯一的优点是大大缩短了分析所需的时间。如今,它正在将自己建立为一种可靠...

【文章页数】：154 页

【学位级别】：硕士

【文章目录】：
摘要
ABSTRACT
CHAPTER 1 INTRODUCTION AND LITERATURE REVIEW
    1.1. INTRODUCTION
        1.1.1. Overview of the chapter
        1.1.2. Macro-element method
        1.1.3. Bucket foundation
    1.2. Literature review
        1.2.1. Introduction
        1.2.2.2D elasto-plastic analysis for the macro-element method
        1.2.3. Improvement of the macro-element method
CHAPTER 2 DIFFERENCE BETWEEN BUCKET FOUNDATION ANDSHALLOW FOOTING FOUNDATION
    2.1. Introduction
    2.2. Geometry and installation process
        2.2.1. Shallow footing foundation
        2.2.2. Bucket foundation
    2.3. General approach of bearing capacity
        2.3.1. Bearing capacity under vertical loading
        2.3.2. Bearing capacity under general loading
    2.4. Difference in the macro-element approach
    2.5. Advantages and disadvantages
        2.5.1. Advantages of a shallow footing
        2.5.2. Disadvantages of a shallow footing
        2.5.3. Advantages of a bucket foundation
        2.5.4. Disadvantages of a bucket foundation
CHAPTER 3 FUNDAMENTAL THEORIES OF THE MACRO-ELEMENTMETHOD
    3.1. Outline of the chapter
    3.2. Bearing capacity formulation for a bucket foundation
        3.2.1. Vertical bearing capacity for caisson in clay
        3.2.2. Vertical bearing capacity of a caisson partially installed in sandwithout suction
        3.2.3. Vertical bearing capacity parameters
    3.3. Macro-element formulation
        3.3.1. Introduction
        3.3.2. Evolution of the macro-element formulation
        3.3.3. Presentation of the macro-element model
        3.3.4. Conventional plasticity models for shallow foundation for offshorestructures
        3.3.5. Elasto-plastic macro-element response
        3.3.6. Uplift model for soil-structure interaction
CHAPTER 4 PARAMETRIC ANALYSIS. EXAMPLE AND VERIFICATION
    4.1. Introduction
    4.2. Constitutive parameters of the macro-element plasticity model
        4.2.1. Nova and Montrasio model (NMM) constitutive parameters
        4.2.2. Nguyen-Villalobos formulation parameters
    4.3. Calculation procedure for the tensile bearing capacity Vt
        4.3.1. Tensile bearing capacity for sand
        4.3.2. Tensile bearing capacity for clay
    4.4. Calculation of the tension parameter
    4.5. Calculation of the elasto-plastic response of a caisson under a monotonicloading system
    4.6. Determination of the point of rotation and approximate design of bucketfoundation
CHAPTER 5 CONCLUSION
REFERENCES
Appendix A MATLAB Script of the model caisson analysis in clay
Appendix B MATLAB Script of the model caisson analysis in sand
ACKNOWLEDGEMENTS



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