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六十年代以前各国规范基本上是以最大主应力理论(第Ⅰ强度理论)来判断容器构件中的应力,以容器构件中最大平均主应力作为主要依据,决定构件的尺寸。通常做法是:算出
Before the sixties, national standards basically judged the stress in container components based on the theory of the maximum principal stress (the first strength theory), and decided the size of the components based on the maximum average principal stress in the container components. The usual practice is: calculate