体外预应力混凝土体外筋应力增量的变形能解法

Using strain energy method to calculate the increment of stress in external stressing girder

利用最小变形能原理推导出计算体外预应力混凝土体外筋应力增量的计算公式,计算了简支梁在均布荷载下体外筋的应力增量,与力法的计算结果比较,两者结果基本一致。变形能法的计算过程与力法计算过程相比更为简单方便,并可以推广到更复杂的结构计算。

The increment of stress is calculated by using strain energy method, of which ＂U＂ should be calculated in strain energy method. Its process of calculation is easier than that of force way, especially in complicated or large structure. Its calculated result is compared with that of force way, and the rationality of energy method is testified.