水平加腋预应力混凝土梁设计方法的探讨

Conferring about Design Methods for Prestressed Concrete Beam with Horizontal Haunches

针对水平加腋预应力混凝土梁的线型为空间曲线的特点,结合实际工程,对是、否考虑曲线空间效应的2种计算方法进行了比较,并对不同线型的预应力损失进行了分析和计算。计算表明,空间线型预应力筋水平投影的曲率不宜太大,线型不宜太复杂,应尽量选择单波形曲线。同时,计算预应力损失时,应考虑空间效应,若仅按照竖直平面内投影曲线计算预应力损失,则误差较大。

In accordance with the fact that the curve mode of the prestressed concrete beam with horizontal hunches are space curves, and in combination with the practical project, the authors made a comparison between two methods of including and excluding space effect of the curve, analyzed and calculated the loss of prestress for different curves. The results show that it is inadvisable to select a large curvature of horizontal projection and a complicated space curve, while the use of single waved curve would be better. What＇ s more, the space effect should not be ignored when calculating the loss of prestress, otherwise a great inaccuracy might be occurred.