国产剧情AV麻豆香蕉精品,国产女人A级毛片18视频,人妻丰满熟人熟妇av无码,久久99国产精品9床震网站

Structural design knowledge: What are the advantages and disadvantages of steel structures?

Structural design knowledge: What are the advantages and disadvantages of steel structures?

What are the advantages and disadvantages of steel structures?
Steel features:
(1) high intensity, high weight ratio; good ductility, toughness;
(2) Material uniform, consistent mechanics assumptions, security high reliability;
(3) industrial production, a high degree of industrialization, the construction speed;
Cons: not fire-resistant steel heat; easy to rust, corrosion resistance is poor.