Ductile materials are good in Tension. So, Steel being a ductile material is also strong in tension. Brittle materials are good in Compression. So, concrete being a brittle material is also strong in compression. So, the place of steel reinforcement depends on the place where tension is generated.
韧性材料在拉力作用下性能良好。因此，作为韧性材料的钢材在拉伸时也很坚固。脆性材料具有良好的抗压性。因此，混凝土作为一种脆性材料也具有很强的抗压性。 因此，钢筋的位置取决于产生拉力的位置。
So in the case of simply supported beam compression occurs at top and tension in the bottom. That’s why we generally provide reinforcement in the bottom. While in the case of the cantilever beam tension occurs at top. That’s why we provide reinforcement on top in order to give strength the structure in tension.
因此，在简支梁的情况下，顶部受压，底部受拉。这就是我们通常在底部进行加固的原因。而悬臂梁的拉力发生在顶部。这就是为什么我们要在顶部加固，以增强结构的抗拉强度。
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