【提要】  根据预应力筋孔道和预应力筋的匹配要求，计算确定常用预应力筋重心偏移孔道中心的距离。在此基础上，对一孔布置6股钢绞线和12股钢绞线的两种情况，分别计算考虑和不考虑预应力筋重心偏移时预应力筋的等效荷载、综合弯矩、各跨跨中的预应力摩擦损失和总损失以及预应力引起的柱上弯矩。对计算结果进行比较分析，建议在设计有粘结预应力结构时，尤其是超长结构和宽扁结构，要考虑预应力筋重心偏移的影响。【关键词】  预应力筋偏移  等效荷载  综合弯矩  柱上弯矩
Study on the Influence of Prestressed Strands' Deviation for the Prestressed Structrure/
Wu Xueshu1，Xiong Xueyu1，2，Shen Tufu3(1 Research Institute of Prestress,Tongji University, Shanghai  200092,China; 2  Key Laboratory of Advanced Civil Engineering Materials,Tongji University,Shanghai 200092,China；3  Tongji Prestressing Engineering Co., Ltd., Shanghai  200092,China)
Abstract:According to the matching demand of prestressing duct's size and prestressed
strands' area, deviation distances of prestressed strands are calculated. On this basis, equivalent load, resultant moment, friction loss and total loss at the middle of the span and column moment caused by prestressed strands are calculated for prestressed strands' geometry considering deviation or not. The computation is done in two cases,which are 6 strands in one duct and 12 strands in one duct. Through comparison and analysis, it is suggested that influence of prestressed strands' deviation should be considered for bonded prestressed structure, especially for bonded prestressed externallong structure and bonded prestressed wide flat structure.
Keywords:prestressed strands' deviation; equivalent load; resultant load; column moment
1)同济大学预应力研究所，上海，200092；2)同济大学先进土木工程材料教育部重点实验室
，上海，200092；3)上海同吉预应力工程有限公司，上海，200092。
*上海市《预应力混凝土结构设计规程》（修订）研究项目；上海市建设技术发展基金（B05043）资助项目。