消除钢材的应力
钢材是钢结构的核心载体，材料选型直接决定结构安全、耐久性与经济性。当前主流结构用钢为 Q235B、Q355B、Q355C 及低合金高强钢，高层建筑与大跨场馆优先选用 Q355 及以上级别，低温环境需选用冲击韧性合格的低温钢。https://vk.com/topic-238926703_62897997
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写的真的很不错
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