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【提要】  根據(jù)預(yù)應(yīng)力筋孔道和預(yù)應(yīng)力筋的匹配要求，計(jì)算確定常用預(yù)應(yīng)力筋重心偏移孔道中心的距離。在此基礎(chǔ)上，對(duì)一孔布置6股鋼絞線和12股鋼絞線的兩種情況，分別計(jì)算考慮和不考慮預(yù)應(yīng)力筋重心偏移時(shí)預(yù)應(yīng)力筋的等效荷載、綜合彎矩、各跨跨中的預(yù)應(yīng)力摩擦損失和總損失以及預(yù)應(yīng)力引起的柱上彎矩。對(duì)計(jì)算結(jié)果進(jìn)行比較分析，建議在設(shè)計(jì)有粘結(jié)預(yù)應(yīng)力結(jié)構(gòu)時(shí)，尤其是超長結(jié)構(gòu)和寬扁結(jié)構(gòu)，要考慮預(yù)應(yīng)力筋重心偏移的影響。【關(guān)鍵詞】  預(yù)應(yīng)力筋偏移  等效荷載  綜合彎矩  柱上彎矩
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)同濟(jì)大學(xué)預(yù)應(yīng)力研究所，上海，200092；2)同濟(jì)大學(xué)先進(jìn)土木工程材料教育部重點(diǎn)實(shí)驗(yàn)室
，上海，200092；3)上海同吉預(yù)應(yīng)力工程有限公司，上海，200092。
*上海市《預(yù)應(yīng)力混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)程》（修訂）研究項(xiàng)目；上海市建設(shè)技術(shù)發(fā)展基金（B05043）資助項(xiàng)目。