摘要
本文采用能量法对后张有粘结预应力连续梁中预应力次弯矩是否变化的问题进行了深入的研究，并与普通钢筋混凝土连续梁进行对比，基本上回答了有关次弯矩是否变化的问题。研究结果表明，在用增量法解预应力连续梁时，可以不必考虑初始次弯矩是否变化的问题，而将其作为一不变的量对待。因为随着外荷载的作用，次弯矩的独立概念已不复存在。其对加载过程的影响可以通过连续梁的刚度变化体现出来。
In this paper, energy method is used to study the change of the secondary moment of prestressed concrete continuous beams during loading. In the same time, comparison is made with the non-prestressed concrete continuous beams. The question whether the secondary moment is changing while loading is answered. It shows that the secondary moment is unaltered when increment method is adopted to study the beams. With further increase of load, the effect of the secondary moment begins to emerge. It is reflected in the change of the stiffness of the beam sections.
出处
《工程力学》
EI
CSCD
北大核心
2000年第5期92-99,共8页
Engineering Mechanics
基金
国家自然科学基金!(59338130)
关键词
预应力连续梁
次弯矩
能量法
prestressed concrete beams
secondary moment
energy method
