针对基础环式风电机组基础常见的开裂、冒浆现象,提出采用环氧树脂灌浆料修补T型法兰附近区域裂缝并填补磨空区。采用有限元软件ABAQUS建立未损坏基础和环氧树脂灌浆料加固后基础最不利截面处局部有限元模型,通过往复加载研究了基础的耗能性能,分析结果表明,环氧树脂材料加固后基础的耗能性能较加固前有大幅的提升。建立环氧树脂和水泥基两种不同灌浆材料加固后基础整体有限元模型,通过单调加载研究基础在极限荷载标准值和设计值下的应力应变分布,分析结果表明,和水泥基灌浆材料加固后的基础相比,环氧树脂材料灌浆加固后T型法兰和基础混凝土接触面的压应力分布更均匀,应力集中现象明显缓解,T型法兰上方混凝土塑性区范围明显减小。
Abstract
In order to solve the common cracking and slurry emitting problems in the embedded-ring foundation, the epoxy resin grouting material is proposed to repair the cracks and fill the cavities near the T-flange. The local finite element models at the weakest section of the undamaged foundation and the reinforced foundation by epoxy resin grouting material are developed by the finite element software ABAQUS. The energy dissipation capacity of the models under the reciprocating loading are studied . Numerical results show that the energy dissipation capacity is significantly improved after reinforcement. Then, two overall finite element models are established for the reinforced foundations grouted by epoxy-resin and cement-based materials, respectively. The stress and strain distribution of the foundations are investigated under monotone loading of the standard value and design value of ultimate load. Results show that the distribution of compressive stress on the interface between the T-flange and the foundation concrete for the foundation reinforced by epoxy resin material is more uniform. The stress concentration phenomenon is obviously alleviated and the plastic zone of concrete above the T-flange is obviously reduced.
关键词
风电机组 /
基础 /
有限元分析 /
环氧树脂 /
加固
Key words
wind turbines /
foundations /
finite element analysis /
epoxy resins /
strengthening
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