本文介绍在低松弛钢和应力消除钢中,直接计算传递之后松弛损失的公式。这个公式是用一个表达混凝土塑性应变的时间函数,反复应用纯松弛公式而推导得出来的。这个公式被化成可与现行规范中公式相比较的形式。 张拉到接近其屈服极限的预应力钢筋,会产生随时间而发展的应力损失。当钢绞线或钢丝被张拉在两锚具之间的恒定长度上,这种应力损失即为纯松弛损失。对于应力消除钢可以直接用马 This article describes the formulas for directly calculating the relaxation loss after transfer in low relaxation steel and stress relief steels. This formula is derived using a time function that expresses the plastic strain of a concrete and repeatedly applies the purely relaxation formula. This formula is formulated to be comparable to the formula in the current specification. Tensioning prestressing tendons close to their yield point produces stress losses that develop over time. When the strand or wire is stretched at a constant length between the two anchors, this loss of stress is the net loss of relaxation. For stress relief steel can be used directly horse