Based on the design code of concrete structure (GBJ10-89), the paper gives the nominal tensile stress method of controlling crack width in prestressed concrete structure of punchy bars.

以混凝土结构设计规范(GBJ10—89)为基础。建立了强力钢筋做预应力筋的预应力混凝土结构用名义拉应力控制裂缝宽度的方法。

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So whereas the nominal maximum width in an image is 20km, Pleiades can scan the ground rapidly to effectively build up a much wider swath at any given point.

BBC: Sharp-eyed Pleiades returns first pictures