邬喆华¹   卫纪德²   唐锦春¹   郑文忠²   楼文娟¹
    （1 浙江大学建筑工程学院  杭州 310027；  2 哈尔滨工业大学土木工程学院  150090）

[提要]  预应力混凝土多层框架结构的施工多采用“逐层浇筑，逐层张拉”或“数层浇筑，数层张拉”的施工方案，而现行设计方法是按“整体浇筑，整体张拉”的假定施工方案进行设计计算。显然设计的计算模型与实际施工方案不吻合。由于在“逐层浇筑，逐层张拉”时，下层张拉对上层末建结构内力无影响，因此结构内力的设计值与实际值将出现偏离。根据结构力学原理建立了现行设计法中预应力综合弯矩和次弯矩偏离实际值大小的相对差公式；结合施工的具体情况对预应力混凝土框架柱进行了计算分析。按文中所给的数据对框架柱控制截面处内力进行修正，可以满足设计的要求。
[关键词]  预应力混凝土  框架  施工工艺  荷载平衡

Multi-story prestressed concrete frames( MPCF) are widely used in practice. Construction process of MPCF should be noted in structural analysis because the sequence of steel tension and concrete pouring directly affects on building mechanical model.  But in general it is not considered during designing MPCF so that the correction of analysis solution is influenced upon. Applying the principle of structural mechanics, the formula for estimating the relative deviation of internal force from the normal design to the reality according to construction process is provided. The simple method for designing is put forward to satisfy requirement of columns in MPCF.
Keywords:  prestressed concrete; frame; construction technique; equivalent load