预应力框架梁中预应力筋索型的优化

在预应力混凝土框架梁中，通常配置抛物线形预应力筋。但有时这种单一的抛物线形配筋不能同时满足梁跨中和支座处的抗裂要求，这时可以通过在梁底增配直线形预应力筋来解决这个问题。还提出了在预应力筋总量最小的情况下，如何使得抛物线形布筋和直线形布筋两者取得最优比例的方法。

OPTIMIZATION OF PRESTRESSED REINFORCEMENT SHAPE IN PRESTRESSED FRAME BEAMS

Parabolic prestressed reinforcements are usually used in pretressed concrete frame beams. But sometimes this singular parabolic prestressed reinforcements can＇ t satisfy the requirement of crack resistance at support abutment and midspan simultaneously, the problem can be solved by arranging linear prestressed reinforcements at the bottom of beams. In this paper, author has also put forward a method of how to obtain the optimal ratio of the amount of two kind of reinforcements under the condition of the least gross amount of prestressed reinforcements.