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参考混凝土结构设计规范与路桥规范(JTG D62—2004)中的预应力损失计算公式,对内蒙古红庆河煤矿筒仓中预应力钢绞线预加应力进行了长期监测并计算了长期预应力损失计算,得出预应力长期损失的理论值与实验值。通过理论值与实验值对比的方法,得出两种规范中公式适用于筒仓且偏安全。在损失中,混凝土收缩徐变与预应力筋应力松弛是主要影响因素且在早期损失快,同时依据实测数据可以分析出长期损失在总损失中所占比例。
With reference to the calculation formula of prestress loss in concrete structure design code and road and bridge code (JTG D62-2004), the prestressing stress of prestressing steel strand in silo of Hongqinghe Coal Mine in Inner Mongolia was monitored for a long time and the long-term prestress loss Calculated to obtain the theoretical value and experimental value of long-term loss of prestressed. By comparing the theoretical value with the experimental value, it is concluded that the formulas in the two kinds of norms are suitable for silos and partial safety. In the loss, shrinkage and shrinkage of concrete and stress relaxation of prestress tendons are the main influencing factors and the loss is fast in the early stage. At the same time, the proportion of long-term losses in the total loss can be analyzed based on the measured data.