海上风机灌浆连接段应力评价方法探析  

A Stress Evaluation Method for Grouted Connections of Offshore Wind Turbines

作　　者：陈涛[1] 姚政韬 王衔 陈珂 元国凯 CHEN Tao;YAO Zhengtao;WANG Xian;CHEN Ke;YUAN Guokai(Department of Structural Engineering,Tongji University,Shanghai 200092,China;China Energy Engineering Group Guangdong Electric Power Design Institute Co.,Ltd.,Guangzhou 510663,China)

机构地区：[1]同济大学建筑工程系,上海200092 [2]中国能源建设集团广东省电力设计研究院有限公司,广州510663

出　　处：《南方能源建设》2020年第1期33-39,共7页Southern Energy Construction

基　　金：广东省促进经济发展专项基金“基于大数据的海上风电场支撑结构强度与疲劳实时评估研究”(粤自然资源合[2019]019)。

摘　　要：[目的]灌浆连接段被广泛应用于海上风机支撑结构与基础的连接,其力学性能对整个风机的可靠性至关重要。为了探寻对灌浆连接段合适的应力评价方法,文章进行了有限元模拟分析。[方法]通过建立数值模型来探究灌浆连接段在给定的压弯荷载下的应力分布情况,提出用名义平均应力和应力相关系数的概念来评价其总体应力水平,最后研究了各种参数对连接段力学性能的影响,并确定了在各参数变化条件下应力相关系数的范围。[结果]参数分析的结果显示剪力键的位置对灌浆连接段钢管的Mises应力和浆体的Tresca应力有较大的影响。并且钢管的厚度与最大应力具有负相关性。同时发现,灌浆层的最大Tresca应力仅对自身厚度的变化较为敏感,而对钢管厚度变化不敏感。最后,根据参数分析确定的应力相关系数在3到6之间。[结论]参数分析结果可以为灌浆连接段设计提供参考,而应力相关系数能够被应用于初步评估灌浆连接段在联合荷载作用下的力学性能。[Introduction]Grouted connections are widely used to connect the support structure and the foundation of offshore wind turbines.Therefore,their mechanical properties are very important to the reliability of the whole structure.In order to find a proper method to evaluate the stresses of grouted connections,numerical simulations were conducted.[Method]Numerical models were established to investigate the stress distribution of a grouted connection under given compression and bending loads.The conceptions of nominal average stress and stress correlation coefficient were then proposed,which were used to evaluate the overall stress level of the grouted connection.Moreover,parameter studies were carried out,and the range of stress correlation coefficients were determined.[Result]It was found that both the Mises stresses of steel tubes and Tresca stresses of the grout were dominated by the locations of shear keys in the grouted connection.And there was an inverse negative correlation between the thickness of steel pipes and the maximum stresses of them.At the same time,the maximum Tresca stresses of the grout were only sensitive to the change of its thickness rather than the change of the thickness of steel tubes.Finally,the stress correlation coefficients all fell between 3 to 6 according to the parametric studies.[Conclusion]The result of parametric studies can partly guide the preliminary designs of grouted connection,and the stress correlation coefficients can be used to approximately evaluate the mechanical properties of grouted connections under combined loads.

关 键 词：灌浆连接段 压弯荷载 参数分析 名义平均应力 

分 类 号：TM614[电气工程—电力系统及自动化] TK83[动力工程及工程热物理—流体机械及工程]