有效预应力作用下预应力砼超静定结构的次弯矩计算

Calculation of Secondry Moments Caused by Effective Prestressing Force in Statically Indeterminate Prestressed Concrete Structures

本文提出的约束次弯矩法是直接由主弯矩计算预应力砼超静定结构的次奇矩，省去了常用的等效荷载法［１］［３］计算次弯矩时需计算等效荷载和综合弯矩这两个步骤，并能较准确计算考虑各种预应力损失后的有效预应力作用下的次弯矩，提高工程设计精度。

The method of restraining secondary moments, which can be used for directly calculating the secondary moments in statically indeterminate prestressed concrete structures, was developed in this paper. The mothod is easy to use by avoiding the calculations of equivalent loads and resulting moments when applying the equivalent load method to calculate secondary moments. The secondary moments caused by effective prestressing force with any kind of prestressing losses can be accurately calculated by the method presented here, resulting in improving the precision of the method of design.