筒仓预应力筋长期损失分析  

Analysis on long-term loss of prestressed tendon in silo

作　　者：刘德乾[1] 李小军[1] 高晓思 

机构地区：[1]河北工程大学土木工程学院,河北邯郸056038 [2]中煤建安集团七十三处,河北邯郸056106

出　　处：《煤炭工程》2017年第5期17-19,共3页Coal Engineering

基　　金：河北工程大学与中煤建安集团七十三处校企合作项目(20151012)

摘　　要：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。Through the long-term pre- stress detection and calculation of pre- stressed steel strand in product silo of Hongqinghe Coal Mine, the theoretical value and experimental value were obtained. According to the comparison between theoretical value and experimental value, the formula in both codes is applicable to the silo and tends to be safer; the concrete shrinkage-creep and steel strand stress relaxation are major reasons for the loss, and the loss happens faster in early stage; the proportion of long-term loss in total loss can be analyzed according to the measured data.

关 键 词：大直径筒仓 预应力长期损失 钢绞线应力松弛 收缩与徐变 

分 类 号：TU378[建筑科学—结构工程]