核电站安全壳混凝土结构长期预应力预测模型初步研究

摘要

基于 ACI209R -92、CEB - FIP（1990）、GL2000收缩与徐变模型基础，充分考虑了混凝土的收缩、徐变和预应力钢筋松弛的耦合作用后推导出安全壳长期预应力预测的计算模型。通过计算分析，其中基于 CEB - FIP（1990）模型的预测值与实测值更为接近。采用3000 h 内的预应力监测值修正模型后，该模型对长期预应力值的预测更为合理。该研究成果为核电站的长寿期运行提供了很好的技术支撑。%It provided a formulas for calculating the pressing value of the containment,which was deduced on considering the influence of concrete dry shrinkage,creep and the relaxation of prestress strand coupling effect basing on ACI209R - 92,the CEB - FIP(1990), GL2000 shrinkage and creep model.Through calculation and analysis,the prestress value calculating based on CEB - FIP(1990)model is more close to the measured values.The model corrected by using prestress strand monitoring value within 3 000 h,and the prestress value predicted of this model is more reasonable.The results are a good technical support for long term operation of the nuclear power plants.