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本文通过两批模型试验和若干工程的实践，说明了混合配筋的预应力混凝土框架扁梁长期挠曲（即反拱和挠度）变形的规律性不同于传统的观念。文中提供了任意受力状态下，混合配筋截面的构件长期挠曲系数σ（t，τ）的计算方法；并用该系数反映长期挠曲的变化规律。通常θ（t，τ）＝＋3～－3．5。这种特殊的规律性（即长期反拱可增长、持平或下降的规律性）在框架扁梁楼盖结构形式中显示得更加敏感和突出，应当引起注意。
In this paper, through the practice of two batches of model tests and several projects, it is shown that the long-term flexural (ie, reversed arch and deflection) deformation of pre-stressed concrete frame flat beams with mixed reinforcement is different from the traditional concept. The method for calculating the long-term flexural coefficient σ (t, τ) of members with mixed reinforcement cross-sections under any force is provided, and the variation law of long-term deflection is reflected by this coefficient. Usually θ(t, τ) = +3 to -3.5. This special regularity (that is, the regularity of long-term inversion of arches that can be grown, held flat, or falling) is more sensitive and prominent in the structural form of the flat girder floor, and should attract attention.