摘要
海上风电是未来清洁能源发展的一个重要组成部分,风机基础是海上风电场建设的重点之一。海上风机基础多采用灌浆连接,通过在内外钢筒内灌注超高强水泥基灌浆料,使上下两部分形成受力结构。在风机漫长服役期内,灌浆连接段会承受多达109次轴向及弯矩荷载效应,疲劳问题较为突出。而灌浆料作为灌浆连接段重要的组成部分,其疲劳性能是评价灌浆连接段结构承载能力的重要指标。超高强灌浆料与高强混凝土同属于水泥基材料范畴,它们在疲劳损伤机理等方面具有共通之处。单轴等幅疲劳作用荷载下水泥基材料的疲劳损伤、极限破坏机理是该领域研究的热点。而超高强灌浆材料作为新型建筑材料,受制于研发制备水平,疲劳性能试验方面的研究相对较少。近年来,业内材料研发单位开展了旗下相关产品的疲劳强度与疲劳寿命之间作用关系的研究工作,而相关高校基于业内品牌产品相继开展了不同结构形式灌浆连接段静力与疲劳性能研究,也取得了一些成果,但关于超高强灌浆料疲劳性能的影响因素以及损伤机制等尚属空白。针对工程中大量应用的混凝土材料,科研人员开展了比较完整的疲劳性能研究,包括反复荷载作用下的疲劳损伤、极限破坏机理,单轴、多轴受压以及拉伸、弯拉、复合荷载作用的疲劳性能的测试方法以及影响因素与作用机制等。由于受试验设备、条件、环境等因素的影响,结果呈现出多样性和离散性。而在超高强灌浆料方面,研究者侧重于超高强灌浆料不同服役环境下疲劳性能获取、性能预测以及灌浆连接段疲劳性能的研究,并形成海上风电场灌浆料疲劳性能计算的相关规范。本文通过梳理混凝土和灌浆料疲劳性能、损伤机理等方面的相关进展,汲取混凝土疲劳性能研究中的经验,以期对超高强灌浆料疲劳性能研究提供指导�
Offshore wind power is an important part of the development of clean energy in the future,and the wind turbine foundation is one of the key points of offshore wind farm construction.The foundation of offshore fan is mostly connected by grouting,and the upper and lower parts of the foundation are formed into a stress structure by pouring ultra-high strength cement-based grout into the inner and outer steel cylinders.In the long service life of the fan,the grouting connection section will bear up to 100 million times axial and bending moment load effects,and the fatigue problem is more prominent.As an important part of grouting connection,grouting material’s fatigue performance is an important performance index to evaluate the bearing capacity of grouting connection.Ultra-high strength cement-based grouting materials and high strength concrete all belong to the category of cement-based materials,which have common points in fatigue damage mechanism.The fatigue damage and ultimate failure mechanism of water mud based materials under uniaxial constant amplitude fatigue load is a hot topic in this field.However,as a new type of building material,the research on the fatigue performance of ultra-high strength grouting material is relatively less due to the research and development level.In recent years,the units of materials in the industry have carried out the research on the relationship between the fatigue strength and fatigue life of related products.Based on the brand products in the industry,relevant universities have successively carried out the research on the static and fatigue performance of different structural forms of grouting connection sections,and have also made some achievements.However,the influence factors and damage mechanism of ultra-high strength grouting materials are still blank.For concrete materials used in engineering,researchers have carried out a relatively complete study on fatigue performance,including fatigue damage and ultimate failure mechanism under repeated load,fatigue performance u
作者
沙建芳
夏中升
刘建忠
郭飞
徐海源
SHA Jianfang;XIA Zhongsheng;LIU Jianzhong;GUO Fei;XU Haiyuan(State Key Laboratory of High Performance Civil Engineering Materials,Nanjing 210008,China;Jiangsu Sobute New Materials Co.Ltd.,Nanjing 211103,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2021年第11期11013-11026,共14页
Materials Reports
基金
国家自然科学基金面上项目(51978318)。
关键词
海上风电场
灌浆料
受压疲劳
疲劳寿命预测
offshore wind farm
grout material
fatigue property
fatigue life prediction
