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（同濟(jì)大學(xué)預(yù)應(yīng)力研究所上海 200092；?先進(jìn)土木工程材料教育部重點(diǎn)實(shí)驗(yàn)室（同濟(jì)大學(xué)）上海 200092）【提要】  預(yù)應(yīng)力混凝土結(jié)構(gòu)的側(cè)限影響與結(jié)構(gòu)形式、梁柱線剛度和施工方法等因素有關(guān)，對(duì)于是否與有效預(yù)應(yīng)力的分布有關(guān)尚沒(méi)有相關(guān)討論。改變柱梁的線剛度比、摩擦系數(shù)進(jìn)行計(jì)算分析發(fā)現(xiàn)，側(cè)向約束影響系數(shù)將隨著梁柱線剛度比的減小而減小，隨著摩擦損失的增大而增大；忽略有效預(yù)應(yīng)力的分布得到的結(jié)果與實(shí)際情況有
偏差，這種偏差隨著梁柱線剛度比的減小而增大，隨著摩擦損失的增大而增大，因此預(yù)應(yīng)力作用受側(cè)向約束的影響應(yīng)考慮有效預(yù)應(yīng)力的分布。建議直接考慮次內(nèi)力影響進(jìn)行預(yù)應(yīng)力混凝土結(jié)構(gòu)的設(shè)計(jì)計(jì)算。
【關(guān)鍵詞】  預(yù)應(yīng)力混凝土結(jié)構(gòu)  側(cè)向約束  軸向變形  約束影響  有效預(yù)應(yīng)力
Analysis on Lateral Restraint of Prestressed Concrete Frame Structure/Xiong Xueyu，Zhang Caihong，Wu Xueshu(Institute of Prestressed Structures，Tongji University,Shanghai  200092,China; Key Laboratory of Advanced Civil Engineering Materials,Tongji University,Shanghai  200092,China)
Abstract:The influence of lateral restraints on the prestressed concrete structure has beendiscussed in many papers and main factors including the style of structures, stiffness ratio of column to beam and method of construction are considered except the distribution ofeffective prestress. Based on the analysis of numerous practical projects, by changing the stiffness ratio of column to beam and the friction coefficient, an interpolation between the results whether considering the distribution of effective prestress or not is found. It is indicated that the modulus of lateral restraint increase with the increase of friction loss, while decrease with the dimish of stiffness ratio of column to beam. So the distribution of effective prestress should be considered in the calculation of lateralrestraint modulus.The suggestion of considering secondary force into the computaton formulas is proposed.
Keywords:prestressed concrete structure;  lateral restraint;  axial deflection; restraint
 effect;  effective prestressed