钢筋混凝土材料的力学性能

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Chapter2: Mechanical Properties of Reinforcement and Concrete
钢筋和混凝土材料的力学性能
第二章
钢筋和混凝土的材料性能
2.1 Reinforcement (or Rebar)(钢 筋 )
Questions: 1. Reinforcement Types? 2. What about the usage for different rebars types? 3. What mechanical properties should we know? 4. How to determine the rebar’s strength for structural design?
2.1 钢筋
第二章
钢筋和混凝土的材料性能
2.1 Steel Reinforcement
一、Steel Type Hot-Rolled, Steel Wire, Steel Strand, Heat Treated, ColdForming
2.1 钢筋
第二章
钢筋和混凝土的材料性能
2.1 钢 筋 Steel Reinforcement
一、钢筋的品种(Type) 热轧(Hot-Rolled)钢筋、中高强钢丝(Steel Wire)和钢绞线 (Steel Strand)、热处理(Heat Treated)钢筋和冷加工(ColdForming)钢筋
2.1 钢筋
第二章
钢筋和混凝土的材料性能
热轧钢筋 Hot Rolled Steel Reinforcing Bar HPB235级、HRB335级、HRB400级、RRB400级 HPB
Bar Plain Hot rolled
热轧光圆钢筋
HRB
Bar Rolled Hot rolled
热轧带肋钢筋
RRB
Bar Ribbed Rolled
余热处理钢筋
Yield strength 屈服强度 fyk
HPB235级： fyk = 235 N/mm2 HRB335级： fyk = 335 N/mm2
（标准值=钢材废品限 值，保证率97.73%）
HRB400级、RRB400级： fyk = 400 N/mm2
2.1 钢 筋
第二章
钢筋和混凝土的材料性能
HPB235 is mostly used as plain bars and generally used for reinforcement of cast in-place concrete slabs. The strength of HRB335 and HRB400 is higher and mainly used as reinforcement of RC members. The strength of RRB400 is too high to used for reinforcement in RC members. It is usually used as prestressed reinforcement.
2.1 钢 筋
第二章
钢筋和混凝土的材料性能
HPB235级(Ⅰ级)钢筋多为光面钢筋（Plain Bar）， 多作为现浇(In-Situ)楼板的受力钢筋和箍筋 HRB335级(Ⅱ级)和 HRB400级(Ⅲ级)钢筋强度较 高，多作为钢筋混凝土构件的受力钢筋，尺寸较大 的构件，也有用Ⅱ级钢筋作箍筋的为增强与混凝土 的粘结（Bond），外形制作成月牙肋或等高肋的变 形钢筋（Deformed Bar）。 Ⅳ级钢筋强度太高，不适宜作为钢筋混凝土构件中 的配筋，一般冷拉后作预应力筋(Prestressed Reinforcement) 延伸率(Elongation Strain)：δ5=25、16、14、 10%，直径8~40。 2.1 钢 筋
第二章
钢筋和混凝土的材料性能
Wire or tendon are all used in prestressed concrete structures. The strength is ranged from 800 to 1860MPa.
Cold working can improve the strength of rebar and save steel.
Heat treated rebar is much higher in strength than ordinary rebar and has a moderate elongation strain.
2.1 钢筋