| 风、浪荷载作用下海上风机单桩结构灌浆连接段疲劳性能评价 |
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| 引用本文： | 黎亚舟,王衔,陈涛,顾祥林.风、浪荷载作用下海上风机单桩结构灌浆连接段疲劳性能评价[J].海洋工程,2021,39(4):104-113,162. |
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| 作者姓名： | 黎亚舟 王衔 陈涛 顾祥林 |
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| 作者单位： | 中交第三航务工程局有限公司, 上海 200032;中交第三航务工程局有限公司, 上海 200032;同济大学 工程结构服役性能演化与控制教育部重点实验室, 上海 200092 |
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| 基金项目： | 国家重点研发计划（2017YFC1500704） |
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| 摘 要： | 灌浆连接段的疲劳性能对于海上风机单桩支撑结构至关重要。基于385种工况下的某实际5 MW单桩风机支撑结构在风、浪荷载作用下的动力响应分析,获取了灌浆连接段荷载边界条件时程。建立灌浆连接段精细化有限元子模型,将荷载边界条件转化为应力时程。对于剪力键采用"热点应力"方法进行疲劳性能评价。对于灌浆材料,选取剪力键附近灌浆材料单元积分点处的第三主应力进行疲劳性能评价。采用Palmgren-Miner线性损伤累计准则和雨流计数方法进行疲劳损伤的累计。在某实际灌浆连接段20年的设计寿命周期内,最大剪力键总疲劳损伤为1.35×10~(-10);最大灌浆材料总疲劳损伤为1.54×10~(-3)。由此可见,灌浆连接段的疲劳性能由灌浆材料控制,且损伤值远小于限值1/3,在现有的荷载条件下,灌浆连接段不会发生疲劳破坏。分析产生损伤较大的几种工况可知,风速对现有单桩结构灌浆连接段疲劳的损伤起控制作用。
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| 关 键 词： | 风浪荷载 海上风机 单桩结构 灌浆连接段 疲劳性能评价 |
| 收稿时间： | 2020/8/7 0:00:00 |
Fatigue evaluations of grouted connections in monopile structures for offshore wind turbines under wind and wave loadings |
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| LI Yazhou,WANG Xian,CHEN Tao,GU Xianglin.Fatigue evaluations of grouted connections in monopile structures for offshore wind turbines under wind and wave loadings[J].Ocean Engineering,2021,39(4):104-113,162. |
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| Authors: | LI Yazhou WANG Xian CHEN Tao GU Xianglin |
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| Institution: | China Communication Construction Corporation Third Harbor Engineering Corporation Limited, Shanghai 200032, China;China Communication Construction Corporation Third Harbor Engineering Corporation Limited, Shanghai 200032, China;Key Laboratory of Performance Evolution and Control for Engineering Structures of Ministry of Education, Tongji University, Shanghai 200092, China |
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| Abstract: | The fatigue behavior of grouted connections (GCs) is critical to monopile structures for offshore wind turbines. Based the time domain dynamic analysis for a real 5MW monopile structures under 385 kinds of combined wind and wave loading conditions, the extraction of load boundaries of GCs was carried out. The refined finite element sub-models for GCs were established to transfer the load boundaries of GCs into stress time serials. The fatigue behavior of welded shear keys was evaluated by hot-spot stress method. As to grout material, the third principal stresses of element integration points near shear key regions were extracted. Fatigue evaluations were carried out based on the extracted third principal stresses. Palmgren-Miner linear damage accumulation criterion and rain-flow counting method were used. In 20 years service life of the real GC, the largest damage index of welded shear keys was found to be 1.35×10-10. The largest damage factor for grout material was 1.54×10-3. The fatigue behavior of grout material dominated the fatigue life of a GC. Meanwhile, the calculation results were far less than the critical value of 1/3, which indicated that fatigue damage would not happen in GC under existing loading conditions. Furthermore, after analysis of the ocean conditions to cause severe damages, it was found that the wind velocity dominated the fatigue damage of GCs in this monopile structure. |
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| Keywords: | wind and wave loadings offshore wind turbines monopile structures grouted connections fatigue evaluations |
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