后张预应力混凝土结构的次轴力

Hyperstatic axial force in post-tensioned concrete structures

次轴力和次弯矩一样 ,是预应力次内力的一项。预应力构件中的次轴力一般体现为拉力 ,无论从抗裂还是从抗弯的角度看 ,次轴力是一种不利的内力 ,在设计时对它的忽略 ,将会产生工程隐患。本文对次轴力产生的原理和分布特点、考虑次轴力的应力验算和抗弯设计方法 ,以及减小次轴力的措施进行了讨论。

Hyperstatic axial force,which is a kind of hyperstatic internal forces just like hyperstatic moment,represents generally as tensile force in post tensioned members.From the aspect of bending or cracking resistance capacity,it would make a disadvantageous effect on the post tensioned concrete structures.In this paper,the computing formulae for bending resistance capacity design and stress check are proposed,while the producing principles of hyperstatic axial force,the characteristics of its distribution and its reducing method are discussed.