分批张拉预应力损失的空间简化计算方法

A Simplified Spatial Method to Calculate the Prestressing Loss Caused by Batched Tension Process

预应力混凝土多主梁结构的预应力钢筋分批张拉损失计算,按照空间结构理论计算将非常繁琐。结合荷载横向分布系数概念,将竖平面内的预应力钢筋分批张拉损失计算式进行推广,推导了具有普遍适用性的分批张拉损失空间简化计算公式。算例分析表明:该公式能方便地进行桥梁结构中常见的预应力混凝土整体式多主梁或采用体外预应力加固的混凝土装配式多主梁的分批张拉损失计算,是一种有效的空间实用方法。

Calculation of the prestressing loss caused by batched tension process is very complicated in calculation using spatial structural theory. Based on the concept of load lateral distribution coefficient, the expression used to calculate the prestressing loss caused by batched tension process applied in vertical plane, is extended to a simplified spatial formula which has general applicability. The formula is effective and convenient to calculate the prestressing loss caused by batched tension, especially for integral prestressing concrete multi -beam and assembly concrete beam strengthened by external prestressing, which are commonly used in bridge engineering. All those are verified in the paper by analysis of an example.