换算截面A0和净截面A0的意义是什么?为什么计算施工阶段的混凝土应力时,先张法构件用A0,后张法构件用净截面An?而计算外荷载引起的截面应力时,为什么先张法和后张法构件都用A0?

换算截面A0和净截面A0的意义是什么?为什么计算施工阶段的混凝土应力时,先张法构件用A0,后张法构件用净截面An?而计算外荷载引起的截面应力时,为什么先张法和后张法构件都用A0


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问答题换算截面A0和净截面A0的意义是什么?为什么计算施工阶段的混凝土应力时,先张法构件用A0,后张法构件用净截面An?而计算外荷载引起的截面应力时,为什么先张法和后张法构件都用A0?

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