The actual working stress of the concrete structure is one of the important indexes which reflect structure state, and it is one of the important parameters for buildingalteration and strengthened.
而混凝土结构的实际工作应力又是反映其状况的重要的指标之一，是建筑物改造加固的重要参数之一。
2
These savings arise solely from the design of the building fabric itself which should not require replacement or alteration during the whole of its expected 40-year life.
这些节约量是从建筑结构本身的设计单独产生，在其整整40年设计寿命里不再需要替换或改变。
3
The corona will be the most dramatic alteration in the profile of the building in a century.