波浪荷载作用下海上风机桩基基础与上部结构的动力响应研究

发布时间：2018-06-14 10:42

本文选题：海上风机 + 波浪荷载　；参考：《重庆交通大学》2014年硕士论文

【摘要】：本文依托教育部博士点基金项目（编号：20125522110004）和重庆市自然科学基金重点项目（编号：cstc2013jjB3002），以江苏省如东县近海及潮间带风电场建设项目为工程背景，采用数值模拟与理论分析相结合的手段，对周期性波浪荷载作用下的海上风机基础与上部结构动力响应进行了系统地研究，，主要研究内容及成果如下：（1）通过对实际工程资料的搜集与整理，包括如东县近海的海洋环境资料、海洋地质资料以及风机设计资料，对海上风机的结构型式与受荷情况获得了深入的了解与认识。（2）从海上波浪的运动特性入手，对目前发展较为成熟的经典波浪理论以及求解波浪力的Morison方程进行了分析和探讨，选用非线性Stokes五阶波理论建立了波浪运动的数值模型，并计算了单桩式海上风机基础所承受的波浪荷载。（3）根据工程区域的地质资料，选用p y曲线法，对海上风机桩基挠曲变形与地基土壤的土抗力的之间关系进行了分析与计算。以此为依据，建立了地基土体的非线弹性本构模型。（4）将海上风机的具体结构与实际受荷情况作了合理的简化，以ANSYS软件为平台，利用其参数化设计语言APDL，建立了单桩式以及三桩式的海上风机基础与上部结构的三维有限元概化模型（FEM）。（5）考虑波浪荷载的周期性作用，计算分析了单桩式以及三桩式海上风机基础与上部结构的模态振型，确定了结构整体的振动特性。进一步对这两种型式的海上风机基础与上部结构进行了瞬态分析，得到了结构关键部位的位移、应力等动力响应时程曲线。并结合拟静力法将波浪荷载简化为静力荷载，对其作了拟静力反应分析。（6）以单桩式海上风机基础与上部结构的模型为基础，对结构关键部位的动刚度进行了分析，得出了结构关键部位的动刚度随波浪荷载频率的变化曲线。并依据动刚度曲线表现的结构特性，对单桩式海上风机的设计提出了一些设计建议。
[Abstract]:This paper relies on the doctorate fund project of the Ministry of Education (No.: 20125522110004) and the key project of Chongqing Natural Science Foundation (No. 10: cstc2013jjB3002C), taking the construction project of wind farm in the coastal and intertidal zone of Rudong County, Jiangsu Province, as the engineering background. The dynamic response of offshore fan foundation and superstructure under periodic wave loads is studied systematically by means of numerical simulation and theoretical analysis. The main research contents and results are as follows: 1) through the collection and collation of practical engineering data, including marine environment data, marine geological data and fan design data of Rudong County, The structure type and loading situation of offshore fan are deeply understood and understood. (2) starting with the motion characteristics of sea wave, The classical wave theory and the Morison equation for wave force are analyzed and discussed. The nonlinear Stokes fifth order wave theory is used to establish the numerical model of wave motion. The wave load on the foundation of single pile offshore fan is calculated. According to the geological data of the engineering area, the p y curve method is selected. The relationship between flexural deformation of offshore fan pile foundation and soil resistance of foundation soil is analyzed and calculated. Based on this, the nonlinear elastic constitutive model of foundation soil is established. (4) the concrete structure of offshore fan and the actual loading condition are reasonably simplified, and the ANSYS software is used as the platform. Using the parametric design language APDL, a three-dimensional finite element generalized model of the foundation and superstructure of offshore fan with single pile and three piles is established. The periodic action of wave load is considered. The modal modes of the foundation and superstructure of single-pile and three-pile offshore fan are calculated and analyzed, and the vibration characteristics of the whole structure are determined. Furthermore, the transient analysis of the foundation and superstructure of the two types of offshore fan is carried out, and the dynamic response time history curves of the key parts of the structure, such as displacement and stress, are obtained. Combined with the pseudo-static method, the wave load is simplified to static load, and the quasi-static response analysis is made. (6) based on the model of the foundation and superstructure of the single pile offshore fan, the dynamic stiffness of the key parts of the structure is analyzed. The dynamic stiffness curves of the key parts of the structure with the wave load frequency are obtained. According to the structural characteristics of the dynamic stiffness curve, some design suggestions for the single pile offshore fan are put forward.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU476;TU311.3

【参考文献】