风机基础三维有限元分析及加固方法研究
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摘要
针对陆上风机基础存在的承台裂缝、防水破坏、基础环溢浆等问题,利用传统二维有限元对基础应力分析过于简化。采用三维有限元方法并考虑了钢筋与混凝土的耦合作用,对风机基础的受力情况进行分析。结合有限元方法模拟的结果及风机基础破坏资料,得出风机基础破坏的原因主要是在基础环和混凝土连接的底部及表面环内连接区域产生应力集中区,应力集中区混凝土产生损伤破坏进而产生表层的承台裂缝、防水破坏。在受力分析的基础上对防止基础破坏提出了有针对性的加固方法。
In view of the problems existing in the wind turbine foundation, such as cracks in the cap, water-proof failure and overflow of foundation ring, the predigested 2D FEM can not reveal the stress distribution completely. The 3D FEM was adopted to simulate the stress distribution of the wind turbine foundation, considering the coupling effect between steel and concrete. Based on the results of FEM simulation and the detection data of damage of the wind turbine foundation, it is concluded that the main reason for the damage of the wind turbine foundation is the stress concentration zone at the bottom of the foundation ring and the connecting area of the surface ring, and the damage of the concrete in the stress concentration zone leads to the crack and waterproof. On the basis of result data, the pertinent reinforcement method is put forward to prevent foundation damage.
In view of the problems existing in the wind turbine foundation, such as cracks in the cap, water-proof failure and overflow of foundation ring, the predigested 2D FEM can not reveal the stress distribution completely. The 3D FEM was adopted to simulate the stress distribution of the wind turbine foundation, considering the coupling effect between steel and concrete. Based on the results of FEM simulation and the detection data of damage of the wind turbine foundation, it is concluded that the main reason for the damage of the wind turbine foundation is the stress concentration zone at the bottom of the foundation ring and the connecting area of the surface ring, and the damage of the concrete in the stress concentration zone leads to the crack and waterproof. On the basis of result data, the pertinent reinforcement method is put forward to prevent foundation damage.
引文
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[3]王民浩,陈观福.我国风力发电机组地基基础设计[J].水力发电, 2008, 34(11):88-91.
[4]康明虎,徐慧,黄鑫.基础环形式风机基础局部损伤分析[J].太阳能学报, 2014(4):583-588.
[5]李大钧,黄竹也,高海飞,等.基础环埋深和法兰宽度对风机基础承载性状的影响[J].施工技术, 2016, 34(5):719-724.
[6]徐世杰.风机扩展基础力学性能分析及结构优化探究[D].哈尔滨:哈尔滨工业大学, 2013.
[7]张立英.风机基础结构数值模拟及优化设计研究[D].天津:天津大学, 2009.
[8]田静,许新勇,刘宪亮.风力发电机基础接触问题研究[J].水电能源科学, 2010(12):154-156.
[9]练继建,刘喜珠,张立英,等.风机基础钢混组合结构细部损伤分析研究[J].水利水电技术, 2011(1):48-53.