群桩式海上风电基础的力学性能分析

发布时间：2018-10-21 08:14

【摘要】：随着人们对环保的重视和能源需求的不断增长，海上风能作为一种丰富的新型清洁能源得到大力发展。由于海上风力发电基础结构造价昂贵，施工困难，且长期工作在恶劣的海洋环境下，因此对海上风电基础结构的力学问题分析研究是十分重要的。本文对一群桩式海上风电基础结构的强度、疲劳寿命和耐撞性能进行了研究，主要工作如下：首先，采用有限元软件ANSYS建立了风电基础结构的有限元模型，计算了极限工况下的风机载荷和基础上的波浪载荷，根据经验公式计算了桩腿的嵌固点，计算了极限工况下基础的应力和变形，按照DNV规范对基础各结构进行了校核。其次，采用ANSYS软件基于疲劳载荷等效的方法对海上风电基础的混凝土结构进行了疲劳的仿真，基于DNV规范和GL规范对风电基础的仿真结果进行了疲劳分析与评估，同时对这两种规范的疲劳分析方法进行了分析与比较。最后，通过有限元软件ANSYS/LS-DYNA对橡胶护舷和靠船结构组成的防撞结构及1000DWT撞击船建立了碰撞模型。在一定撞击标准下，对不同潮位下的碰撞模型进行了仿真，得到了各潮位下的应力应变、撞击速度-时间曲线和撞击力-时间曲线，对基础防撞结构的耐撞性能进行了研究，并与规范公式计算结果进行了比较。在国内风机规范缺乏的情况下，本文较为系统的对海上群桩式风电基础结构的力学性能进行了研究，，所研究的成果可为海上风电基础结构的设计提供一定的参考。
[Abstract]:With the increasing attention to environmental protection and energy demand offshore wind energy as a rich new clean energy has been vigorously developed. Because the offshore wind power infrastructure is expensive, difficult to construct, and works in a bad marine environment for a long time, it is very important to analyze and study the mechanical problems of offshore wind power infrastructure. In this paper, the strength, fatigue life and crashworthiness of a group of pile offshore wind power infrastructure are studied. The main work is as follows: firstly, the finite element model of wind power infrastructure is established by using finite element software ANSYS. The fan load and the wave load on the foundation are calculated under the limit condition, the fixed point of the pile leg is calculated according to the empirical formula, the stress and deformation of the foundation under the limit condition are calculated, and the structure of the foundation is checked according to the DNV code. Secondly, the fatigue simulation of offshore wind power foundation concrete structure is carried out by using ANSYS software based on the method of fatigue load equivalence, and the fatigue analysis and evaluation of wind power foundation simulation results are carried out based on DNV code and GL code. At the same time, the fatigue analysis methods of these two codes are analyzed and compared. Finally, the collision model of the rubber fender and the anti-collision structure and the 1000DWT impingement ship are established by the finite element software ANSYS/LS-DYNA. Under certain impact standards, the impact models at different tidal levels are simulated, and the stress-strain, impact velocity-time curves and impact force-time curves are obtained. The crashworthiness of the foundation anti-collision structures is studied. The results are compared with those calculated by the standard formula. In the absence of domestic fan specifications, this paper systematically studies the mechanical properties of offshore pile-group wind power infrastructure, and the results can provide a certain reference for the design of offshore wind power infrastructure.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU476

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