复杂荷载下近海风电大直径灌浆套管承载力性状研究

Large-diameter grouted connection is a significant part of the support structure in offshore wind turbines, and the connection has strict requirements on bearing capacity and deformation control. To date, there is still lack of a mature and reliable analysis method on the large-diameter grouted connection. Firstly, experimental analysis on mechanical properties of high strength grouting material is carried out. Brittle Cracking model and Concrete Damage Plasticity model for high strength grouting material are proposed, and a numerical simulation technology is developed for the large-diameter grouted connections under complex loadings. Secondly, the bearing mechanism between high strength grouting material and steel sleeves with shear keys is studied. An analytical model for grouted connections under axial loads is proposed, and the size effect and influence law of large-diameter on grouted connections is analyzed. Furthermore, the calculating method of the ultimate bearing capacity of large-diameter grouted connections is proposed by experimental study on the bearing capacity and deformation property of large-diameter grouted connections under static loads. Finally, the fatigue damage mechanism and developing process of grouted connections is investigated by the experiment of grouted connections under cyclic loadings, and a analysis method is proposed to predict the fatigue life of the large-diameter grouted connections. The research results are innovative and have important value in the bearing mechanism of the large-diameter grouted connections, the long-term performance and the computational method of large-diameter grouted connections. Moreover, the research results have positive meaning in promoting the structural technology of offshore wind energy.

大直径灌浆套管是近海风电支撑结构的关键节点，其承载力和变形控制要求严格，目前尚缺乏成熟可靠的计算分析方法。开展高强灌浆材料的力学特性实验研究，开发高强灌浆材料的脆性开裂本构和塑性累积损伤本构，形成一套复杂荷载下大直径灌浆套管的数值模拟技术。研究带剪力键的钢套管与高强灌浆体之间的界面承载机理，提出轴向荷载下灌浆套管的力学分析模型，掌握大直径灌浆套管的尺寸效应及其影响规律。通过实验研究掌握单调静力荷载下大直径灌浆套管的承载力及变形特性，提出大直径灌浆套管的极限承载力计算方法。开展循环荷载下灌浆套管实验，掌握灌浆套管的疲劳损伤机制及发展过程，提出大直径灌浆套管的疲劳评价和剩余寿命预测方法。研究成果在大直径灌浆套管的承载机制、长期服役性状及其计算分析方法方面具有创新性，有助于推动海上风电结构的技术进步，具有重要的科学意义和研究价值。

大直径灌浆套管是近海风电支撑结构的关键节点，其承载力和变形控制要求严格，目前尚缺乏成熟可靠的计算分析方法。开展高强灌浆材料的力学特性实验研究，开发高强灌浆材料的脆性开裂模型和损伤塑性模型，形成一套复杂荷载下大直径灌浆套管的数值模拟技术。研究带剪力键的钢套管与高强灌浆体之间的界面承载机理，提出轴向荷载下灌浆套管的力学分析模型，掌握大直径灌浆套管的尺寸效应及其影响规律。通过实验研究掌握单调静力荷载下大直径灌浆套管的承载力及变形特性，提出大直径灌浆套管的极限承载力计算方法。开展循环荷载下灌浆套管实验，掌握灌浆套管的疲劳损伤机制及发展过程，提出大直径灌浆套管的疲劳评价和剩余寿命预测方法。研究成果在大直径灌浆套管的承载机制、疲劳性状及其计算分析方法方面具有一定创新性，有助于推动海上风电结构的技术进步，具有科学意义和研究价值。