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为什么说屈服点、抗拉强度和伸长率是建筑工程用钢的重要性能指标?

问答题
2022-04-02 17:18
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正确答案
屈服点σs——表示钢材在正常工作时承受应力不超过该值,是结构设计时取值的依据 。屈服点与抗拉强度的比值σsb 称为屈强比,反映钢材的利用率和使用中的安全可靠程度。伸长率δ——表示钢材的塑性变形能力。钢材在使用中,为避免正常受力时在缺陷处产生应力集中发生脆断,要求其塑性良好,即具有一定的伸长率,可以使缺陷处应力超过σs时,随着发生塑性变形使应力重新分布,以避免结构物的破坏。

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