基于CDP本构的风电基础混凝土软化特性研究  

CDP constitution-based study on softening characteristics of wind-power turbine foundation concrete

作　　者：许新勇[1,2,3] 许文杰 李强 张建伟 马颖[1,2,3] XU Xinyong;XU Wenjie;LI Qiang;ZHANG Jianwei;MA Ying(North China University of Water Conservancy and Hydropower,Zhengzhou 450046,Henan,China;Collaborative Innovation Center of Water Resources Efficient Utilization and Protection Engineering,Zhengzhou 450045,Henan,China;Henan Provincial Hydraulic Structure Safety Engineering Research Center,Zhengzhou 450046,Henan,China;Guangdong Aogang Water Supply Company,Shenzhen 518018,Guangdong,China)

机构地区：[1]华北水利水电大学,河南郑州450046 [2]水资源高效利用与保障工程河南省协同创新中心,河南郑州450046 [3]河南省水工结构安全工程技术研究中心,河南郑州450046 [4]广东奥港供水有限公司,广东深圳518018

出　　处：《水利水电技术（中英文）》2022年第7期191-198,共8页Water Resources and Hydropower Engineering

基　　金：国家自然科学基金资助项目(51979109);河南省重点研发与推广项目(192102310015);河南省科技创新人才计划(174200510020);河南省高校科技创新团队支持计划(19IRTSTHN030);河南省科技攻关计划项目(162102210074)。

摘　　要：为了研究流固耦合作用下风力发电基础的损伤机理,建立了风力发电机组“叶片-塔筒-基础-地基”耦联系统模型,基于混凝土塑性损伤本构,探讨了不同的混凝土软化特性对基础损伤分布的影响,并揭示了随着风致荷载的增加,基础不同部位损伤的演化过程。结果表明:不同的混凝土软化段特性对基础损伤程度及范围有一定影响,但更多的是影响损伤发展的速率,即混凝土开裂后的承载能力降低的速率;应力最大值均出现在顺风载方向基础环对应下阶的底部,即,混凝土软化曲线越陡,基础应力值越大;在基础应力发展过程中,各工况下基础应力变化趋势基本一致,损伤首先出现在迎风侧方向基础环对应的下阶底部,并逐渐顺钢环边缘向两侧延展最终形成贯穿带,其中工况四损伤最大达到0.878。In order to study the damage mechanism of wind-power turbine foundation under fluid-solid coupling effect, a blade-tower-foundation-groundsill coupling system model for wind-power turbine is established, and then the influences from different softening characteristics of concrete on the distribution of foundation damage are discussed herein based on the constitution of concrete damaged plasticity(CDP), thus the evolution processes of the damages at different positions of the foundation increased with the wind-induced load are revealed. The results show that different characteristics of concrete softening sections have certain influences on the damage degree and scope of the foundation, but they mostly affect the rate of damage development, i.e. the decreased rate of the bearing capacity after concrete cracking, while all the maximum stresses appear at the bottom of the lower order corresponding to the foundation ring along the direction of wind load, i.e. the steeper the concrete softening curve is, the larger the foundation stress value is to be. During the development process of the foundation stress, the changing trends of the foundation stresses under all the working conditions are basically consistent, while damage firstly occurs at the bottom of the lower order corresponding to the foundation ring on the windward side and then gradually extends along the edge of the steel ring to both sides and forms a through-out belt finally, in which the damage under the working condition IV is the largest and reaches to 0.878.

关 键 词：风力发电机 耦联模型 塑性损伤本构 软化特性 损伤演化 

分 类 号：TV3[水利工程—水工结构工程]