风电机组基础混凝土温控防裂影响因素研究

Influence Factors on Temperature Control Crack Prevention of Wind Turbine Foundation Concrete

随着风电场的大规模建设,大型风电机组基础混凝土的温度裂缝问题逐渐显著。为探究各影响因素对基础混凝土温控防裂的影响规律,研究以圆形扩展式风机基础为模型,基于ANSYS及其提供的UPFs用户可编程特性进行二次开发,对温度应力场进行仿真模拟计算,并通过敏感性分析判断不同因素对混凝土温度裂缝产生的影响。计算结果表明,风机基础表面和中心部位易产生温度裂缝;基础最高温度对绝热温升最为敏感;表面和内部最大应力对绝热温升、弹性模量和线膨胀系数较为敏感。因此,可通过改变上述3个混凝土的参数取值来控制基础的温度应力场,以减少表面和内部裂缝的产生。

With the large-scale construction of wind farms,the problem of temperature cracks in the foundation concrete has become increasingly prominent.In order to explore the influence of various factors on the temperature stress field of foundation concrete,the circular expansion wind turbine base is used as a model in this study,and the secondary development is carried out based on ANSYS and the user-programmable characteristics of UPFs provided by it.Simultaneously,the temperature stress field is simulated and calculated,and the influence of different factors on concrete temperature cracks is judged by sensitivity analysis.The calculation results show that temperature cracks are prone to occur on the surface and center of the foundation;the maximum temperature is most sensitive to adiabatic temperature rise;the surface and internal maximum stress is more sensitive to adiabatic temperature rise,elastic modulus and linear expansion coefficient.Therefore,the temperature stress field can be controlled by changing the values of the above three concrete parameters to reduce the generation of surface and internal cracks.