圆形扩展风机基础温度场和温度应力仿真分析

Simulation Analysis of Temperature Field and Temperature Stress for Circular Expansion Wind Turbine Foundation

在我国大规模建设风电场的背景下,风机基础混凝土的温度裂缝问题逐渐被重视。为探究圆形扩展风机基础温度场和应力场的变化规律,根据高邮某风电场实际施工条件,并基于ANSYS的UPFs二次开发对圆形扩展风机基础的温度场和温度应力进行仿真模拟计算。计算结果表明:圆形扩展风机基础最高温度和最大应力均出现在中心部位;基础各部位温度降至准稳定后,温度场和温度应力场将随气温呈现周期性变化;表面应力虽然数值较小,但表面最大应力发生在混凝土未完全发育的早期,基础表面依旧存在开裂的可能。通过分析得出以下结论:表面部位的内外温差和温度梯度是产生表面应力的原因;中心部位的温降值决定基础最大温度应力。故可通过控制内外温差、温度梯度和温降值来进行圆形扩展风机基础的温控,为风机基础的温控防裂提供参考。

Under the background of large-scale wind power plant construction in China,the temperature crack of wind turbine foundation concrete has been paid a lot attention. To explore the change law of the basic temperature field and stress field of the circular expansion wind turbine foundation,this paper simulates the temperature field and temperature stress of the circular expansion wind turbine foundation based on the actual construction conditions of a wind farm in Gaoyou based on the secondary development of ANSYS UPFs. The calculation results show that the maximum temperature and maximum stress of the circular expansion wind turbine foundation appear in the central part. After the temperature of each part of the foundation drops to quasi-stable,the temperature field and temperature stress field will change periodically with the temperature. Although the surface stress has a small value,the maximum surface stress occurs in the early stage when the concrete is not fully developed,and there is still the possibility of cracking on the surface of the foundation. Through analysis,it is found that the internal and external temperature difference and temperature gradient of the surface part are the reasons for the surface stress. The temperature drop value of the central part determines the maximum temperature stress of the foundation. Therefore,the temperature control of the circular expansion wind turbine foundation can be performed by controlling the temperature difference between the inside and the outside,the temperature gradient and the temperature drop value,which provides a reference for the temperature control and crack prevention of the wind turbine foundation.