考虑混凝土收缩徐变和钢筋松弛时预应力损失和起拱的计算

本文从、林南薰等提出的混凝土的线性徐变定律出发,较精确地计算由混凝土收缩、徐变和预应力筋松弛的相互影响所引起的预应力混凝土构件的预应力损失。文中给出了先张和后张预应力双向板的预应力损失和起拱的计算公式,并编制成电算程序。文中计算了先张梁的预应力损失,与Apy的结果进行了比较,还计算了后张预应力杆件的预应力损失,并与实验结果相比较,表明本文提出的方法具有较高的精度。

Calculation of Time-Dependent Prestress Loss and Camber of Prestressed Concrete Member

Using linear creep law of concrete proposed by and Lin, the authors of this paper derive a formula for computing time-dependent prestress loss and camber of two-way prestressed concrete slab taken into account the interactions of concrete shrinkage, creep and steel relaxation.Through analyses and computations, some conclusions have been drawn. Results obtained from formula presented in this paper agree well with both the precise solution given in reference 10] and the experimental results in reference 17].