CFRP局部加固对腐蚀后风电塔筒滞回及屈曲特性影响  

Influence of CFRP local reinforcement on hysteretic and buckling characteristics of corroded wind turbine tower

作　　者：王道永 宋波[1,2] 刁硕 卢晨虎 WANG Daoyong;SONG Bo;DIAO Shuo;LU Chenhu(School of Civil and Resources Engineering,University of Science and Technology Beijing,Beijing 100083,China;Beijing International Cooperation Base for Science and Technology-Aseismic Research of the Rail Transit Engineering in the Strong Motion Area,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学土木与资源工程学院,北京100083 [2]北京科技大学强震区轨道交通工程抗震研究北京市国际科技合作基地,北京100083

出　　处：《哈尔滨工业大学学报》2023年第10期40-48,共9页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金(52078038);科技部国家级外专项目(G2021105009L);北京科技大学科技与文明中外人文交流研究开放课题(2020KFYB012)。

摘　　要：海上风电塔长期服役于海洋腐蚀环境中,塔筒结构在海洋腐蚀环境及风、浪、地震等往复荷载作用下易出现局部屈曲及倒塌破坏。本文提出将碳纤维增强复合材料(carbon fiber reinforced polymer,CFRP)用于腐蚀后风电塔筒的局部加固,开展了CFRP-钢结构单剪实验及数值仿真研究。在单剪实验的基础上,基于ABAQUS软件及Python编程开展了CFRP加固腐蚀风电塔筒的滞回性能研究,对比了4种腐蚀工况及6种加固工况结构的破坏形式及耗能机制。研究结果表明:高温环境会使得CFRP与钢的黏结界面出现软化现象,导致CFRP-钢复合结构承载力下降。但在拉力作用下CFRP-钢复合结构均表现为纤维丝断裂早于胶层破坏,在数值模拟时可以将CFRP与钢的黏结关系简化为绑定关系。在循环荷载作用下遭受腐蚀的风电塔筒结构出现提前屈曲,屈曲后结构刚度退化加速,延性降低,材料塑性耗能比例减小,“屈曲铰”耗能比例增加,整体耗能能力下降;使用CFRP加固后,可以延缓结构屈曲出现的时间,扩大材料塑性区域,增加材料塑性耗能比例,提升结构整体耗能能力。为防止CFRP加固层数较少时结构出现突发破坏的现象,加固时应注重考察结构延性变化情况。The offshore wind turbine tower has been used in the marine corrosive environment for a long time.The tower structure in marine corrosive environment is prone to local buckling and collapse under the impact of wind,wave,earthquake and other reciprocating loads.In this paper,carbon fiber reinforced polymer(CFRP)is proposed for local reinforcement of the corroded wind turbine tower.The single shear test and numerical simulation study of CFRP steel composite structure are carried out.On the basis of simple shear test,the hysteretic performance of corroded wind turbine tower strengthened with CFRP is studied using ABAQUS software and python.Structural damages and energy consumption mechanisms under four corrosion conditions and six reinforcement conditions are compared.Results show that the high temperature environment softens the contact between CFRP and steel,which reduces the bearing capacity of CFRP steel composite structures.The fiber fracture of CFRP steel composite structure occurs earlier than the damage of adhesive layer under tensile force.The contact relationship of CFRP steel can be simplified as the“Tie”in numerical simulation.Under the cyclic load,the corroded tower structure shows early buckling,the proportion of material plastic energy consumption decreases and the proportion of“buckling hinge”energy consumption increases.After CFRP strengthening,the buckling of the structure can be delayed,the plastic region of the material can be expanded and the overall energy dissipation capacity of the structure can be improved.In order to prevent the sudden damage of the structure when the number of CFRP strengthening layers is small,attention should be paid to the structural ductility change during strengthening.

关 键 词：风电塔筒 海洋腐蚀 结构屈曲 CFRP加固 有限元模拟 滞回性能 

分 类 号：TU334[建筑科学—结构工程]