孟少平  吴  京  吕志涛
    （东南大学 南京 210096）

[提要]  本文提出利用等效荷载法计算主弯矩，进而计算次弯矩的方法。计算了预应力井式梁和双向板的次弯矩，并对其特征进行分析。算例表明，井式梁和双向板的次弯矩在支座间不呈直线分布，而是由于相邻构件的约束呈空间立体形状。次弯矩在方向和数值上也有其独特的特征。
[关键词]  预应力  井式梁 双向板 次弯矩

This article puts forward the equivalent loading method in calcuating the primary moment in prestressed concrete structures, whose results can be used in further calculation of secondary monent. By this method, a cross-beam system and two -way slab have been calculated, and their charac.teristics have been analyzed. The example demonstrates that the secondary moments of cross-beam systems and two -way slabs do not have a linear distribution between the suppprts, however, because of the restraints between nearby elements, they have a special shape. The direction and magnitude of the secondary moments also have their special characteristics.
Keywords: presressed concrete; secondary moment; cross-beam; two -way slab