简  斌  吴春华  （重庆大学土木工程学院  重庆 400045）

[提要]  在研究多层预应力混凝土框架侧向约束对梁轴压力的影响规律时，重点考虑了施工方法、跨数和梁柱线刚度比等对预应力框架梁轴压力的影响。采用通用有限元法分析结果表明，当采用“全部浇筑，一次张拉”的施工方法时，可只考虑第一层梁中的次轴力影响，对上部各层梁中的次轴力影响可忽略。当采用“逐层浇筑，逐层张拉”的施工方法时，最大次轴力发生在顶层，其次为底层，其它各层次轴力可忽略。
[关键词]  预应力混凝土框架  侧向约束  次轴力

The influence of lateral restraints on axial force of beam in multi-story prestressed concrete frame is discussed and main factors including method of construction, span number and stiffness ratio of column to beam are considered. Finite element software is used in analysis and some results are reached. When prestressing bar is strentched after every story is constructed, the secondary axial force in the first floor should be considered only. When the prestressing bar is strentched after all storys are constructed, the largest secondary axial force occurs in the top floor and then in the first floor.
Keywords:  prestressed concrete frame; lateral restraints; secondary axial force

    参  考  文  献
1．张德峰，吕志涛．侧向约束对预应力混凝土框架压力的影响．建筑结构，2001，31(5)