Large Deformation Finite Element Analysis for Bearing Capaci
发布时间：2021-02-02 21:42
海上浮式风电结构依赖于其可靠的锚固系统以确保海上服役期间的安。吸力锚具有精确安装,重复使用,承载性能较好等特点被广泛应用于各种海上结构,被认为是海上浮式风电结构的一种可用基础形式。但是,目前尚未对南海北部湾地区海上浮式风电结构吸力锚基础进行系统研究。本文在中国南海海域黏土中进行大变形有限元模拟研究吸力锚承载性能。通过大型商用软件ABAQUS/EXPLICIT建立二维轴对称有限元模型（FEM）,研究吸力锚基础在海洋软黏土中不排水条件下承受拉拔荷载的承载性能。采用任意拉格朗日—欧拉（ALE）技术模拟了吸力锚基础拔出过程引起的土体大变形。研究的参数包括竖向荷载上拔速率,荷载作用点,土体参数,吸力锚几何形状和初始应力状态。通过改变土体的摩擦角并获得吸力锚基础的荷载位移曲线研究土体摩擦角对吸力锚基础承载力的影响。研究发现,吸力锚基础的抗拔承载力随着土体摩擦角的增加而呈现增加趋势。通过有限元研究和改进的Abaqus/Explicit分析,发现它可以准确地预测海洋黏土中吸力锚基础抗拔承载性能。这样可以提高设计效率并降低设计成本。虽然,本研究中的数值分析仍具有一定的局限性。但是本文中的研究结果将为中国...
【文章来源】：大连理工大学辽宁省 211工程院校 985工程院校 教育部直属院校
【文章页数】：61 页
【学位级别】：硕士
【文章目录】：
Abstract
摘要
1 Introduction
1.1 Research Background
1.2 Scope of Present Work
1.3 Limitations of Current Study
1.4 Thesis Organization
2 Literature Review
2.1 Suction Caisson
2.2 History and Types of Suction Caisson
2.3 Developments of Suction Caisson
2.4 Applications of Suction Caisson
2.5 Cases of Failures of Platforms/Wind Turbines
2.6 Research Status at China and Abroad
2.6.1 Experimental Study
2.6.2 Prior Work on Suction Caisson Installation
2.6.3 Prior Studies on Pullout Behavior of Suction Caisson in Sand
2.6.4 Numerical Simulation Study
2.6.5 Floating Offshore Wind Turbines
2.6.6 Finite Element Modeling and Simulation of Suction Caisson for Bearing Capacity
2.6.7 Previous Work on Pulling Out Behavior of Suction Caisson in Clay
2.7 Chapter Summary
3 Methodology
3.1 Finite Element Mesh and Boundaries
3.2 Constitutive Model of Marine Clay
3.3 Constitutive Model of Caisson
3.4 Soil-Caisson Interaction:
4 Results and Analysis
4.1 Effect of Soil Friction Angle on the Pullout Capacity of Caisson under Undrained Conditions
4.2 Effect of Soil Cohesion on the Pullout Capacity of Caisson under Undrained Conditions
4.3 Finite Element Analysis Results and Comparison
4.4 Behaviour of Suction Caisson Wall and Soil Interface
4.5 Validation of Numerical Model
5 Conclusions
5.1 Main Findings and Summary
5.2 Future Directions and Recommendations
References
Research Projects and Publications during master study
Acknowledgement
本文编号：3015413
【文章来源】：大连理工大学辽宁省 211工程院校 985工程院校 教育部直属院校
【文章页数】：61 页
【学位级别】：硕士
【文章目录】：
Abstract
摘要
1 Introduction
1.1 Research Background
1.2 Scope of Present Work
1.3 Limitations of Current Study
1.4 Thesis Organization
2 Literature Review
2.1 Suction Caisson
2.2 History and Types of Suction Caisson
2.3 Developments of Suction Caisson
2.4 Applications of Suction Caisson
2.5 Cases of Failures of Platforms/Wind Turbines
2.6 Research Status at China and Abroad
2.6.1 Experimental Study
2.6.2 Prior Work on Suction Caisson Installation
2.6.3 Prior Studies on Pullout Behavior of Suction Caisson in Sand
2.6.4 Numerical Simulation Study
2.6.5 Floating Offshore Wind Turbines
2.6.6 Finite Element Modeling and Simulation of Suction Caisson for Bearing Capacity
2.6.7 Previous Work on Pulling Out Behavior of Suction Caisson in Clay
2.7 Chapter Summary
3 Methodology
3.1 Finite Element Mesh and Boundaries
3.2 Constitutive Model of Marine Clay
3.3 Constitutive Model of Caisson
3.4 Soil-Caisson Interaction:
4 Results and Analysis
4.1 Effect of Soil Friction Angle on the Pullout Capacity of Caisson under Undrained Conditions
4.2 Effect of Soil Cohesion on the Pullout Capacity of Caisson under Undrained Conditions
4.3 Finite Element Analysis Results and Comparison
4.4 Behaviour of Suction Caisson Wall and Soil Interface
4.5 Validation of Numerical Model
5 Conclusions
5.1 Main Findings and Summary
5.2 Future Directions and Recommendations
References
Research Projects and Publications during master study
Acknowledgement
本文编号：3015413
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