（同济大学预应力研究所上海 200092；?先进土木工程材料教育部重点实验室（同济大学）上海 200092）【提要】  预应力混凝土结构的侧限影响与结构形式、梁柱线刚度和施工方法等因素有关，对于是否与有效预应力的分布有关尚没有相关讨论。改变柱梁的线刚度比、摩擦系数进行计算分析发现，侧向约束影响系数将随着梁柱线刚度比的减小而减小，随着摩擦损失的增大而增大；忽略有效预应力的分布得到的结果与实际情况有
偏差，这种偏差随着梁柱线刚度比的减小而增大，随着摩擦损失的增大而增大，因此预应力作用受侧向约束的影响应考虑有效预应力的分布。建议直接考虑次内力影响进行预应力混凝土结构的设计计算。
【关键词】  预应力混凝土结构  侧向约束  轴向变形  约束影响  有效预应力
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