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有效预应力分布对预应力结构的侧限影响分析

Analysis on Lateral Restraint of Prestressed Concrete Frame Structure
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摘要 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。 The influence of lateral restraints on the prestressed concrete structure has been discussed 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 of effective 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 computation formulas is proposed.
出处 《建筑结构》 CSCD 北大核心 2006年第11期91-93,96,共4页 Building Structure
基金 <建筑结构体外预应力加固技术规程> 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。
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 prestressed concrete structure lateral restraint axial deflection restraint effect effective prestressed
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