为保证预应力构件的抗拉强度，对于预应力损失的控制是预应力施工中的关键。
In order to ensure tensile strength of prestressed member, the controlling prestress loss in construction is a key.
因此，镇静钢材主要用于低温下承受冲击的构件、焊接结构及其他要求强度较高的构件。
Therefore, the steel is mainly used for low temperature impact of the impact of the components, welding structure and other requirements of higher strength components.
并用改变构件局部截面尺寸法，对构件锈蚀引起的结构强度变化作了简单的探讨。
And the effect of corrosion on structural strength is discussed in brief by changing section thickness.
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