- 摘 要
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（同濟大學預應(yīng)力研究所 上海 200092； 先進土木工程材料教育部重點實驗室（同濟大學） 上海 200092）
【提要】 闡述了預應(yīng)力次軸力的本質(zhì)，分析了影響次軸力的因素。公式推導與算例分析說明，將約束引起的預應(yīng)力次軸力考慮為預應(yīng)力損失進行設(shè)計時，會使有粘結(jié)預應(yīng)力結(jié)構(gòu)的設(shè)計偏于不安全，而在無粘結(jié)預應(yīng)力結(jié)構(gòu)設(shè)計中則偏于保守。因此，設(shè)計預應(yīng)力框架結(jié)構(gòu)時，應(yīng)將側(cè)向約束考慮為作用在截面重心的次軸力，而不是預應(yīng)力損失。
【關(guān)鍵詞】 預應(yīng)力結(jié)構(gòu) 次軸力 承載能力極限狀態(tài) 使用極限狀態(tài)
Study on Lateral Restraint in Prestressed Structure/Xiong Xueyu， Zhang Caihong，Wu Xueshu(Prestressed Institute，Tongji University, Shanghai 200092,China; Key Laboratory of Advanced Civil Engineering Materials，Tongji University, Shanghai 200092, China）
Abstract:The essence of secondary axial force and influential factor is presented. Throug
h equation deduction and numerical example, it is proved that if secondary axial force is considered as prestress loss, the design may be unsafe for bonded PC structure while be conservative for unbonded PC structure. Thus the secondary axial force should be considered as force axially acting on sectional centroid instead of prestress loss in the design procedure.
Keywords:prestressed structure; secondary axial force; ultimate capacity state; ultim
ate service state
