钢筋工程基础问题汇编.rar

9-1  材料
9-1-1 钢筋品种与规格
混凝土结构用的普通钢筋，可分为两类：热轧钢筋和冷加工钢筋（冷轧带肋钢筋、冷轧扭钢筋、冷拔螺旋钢筋）。冷拉钢筋与冷拔低碳钢丝已逐渐淘汰。余热处理钢筋属于热轧钢筋一类。
热轧钢筋的强度等级由原来的I级、II级、III级和IV级更改为按照屈服强度（MPa）分为235级、335级、400级、500级。
《混凝土结构设计规范》（GB50010-2002）第4.2.1条规定：普通钢筋宜采用热轧带肋钢筋HRB400级和HRB335，也可采用热轧光圆钢筋HPB235和余热处理钢筋RRB400级；并在条文说明中提倡用HRB400级（即新III级）钢筋作为我国钢筋混凝土结构的主力钢筋。该设计规范尚未列入HRB500级钢筋。冷轧带肋钢筋和冷轧扭钢筋因已有专门规程《冷轧带肋钢筋混凝土结构技术规程》（JGJ95-1995）和《冷轧扭钢筋混凝土构件技术规程》（JGJ115-1997）可供参考。
9-1-1-1 热轧钢筋
热轧钢筋是经热轧成型并自然冷却的成品钢筋，分为热轧光圆钢筋和热轧带肋钢筋两种。热轧光圆钢筋应符合国家标准《钢筋混凝土用热轧光圆钢筋》（GB13013-1991）的规定。热轧带肋钢筋应符合国家标准《钢筋混凝土用热轧带肋钢筋》（GB1499-1998）的规定。
1．尺寸、外形和重量
热轧钢筋的直径、横截面面积和重量，见表9-1。热轧带肋钢筋的外形，见图9-1。
热轧钢筋的直径、横截面面积和重量  表9-1
9-1 Materials
9-1-1 steel varieties and specifications
Used in reinforced concrete structures can be divided into two categories: hot-rolled steel and cold-finished steel (cold rolled ribbed steel bars, cold twisted bars, cold drawn steel screw). Cold-drawn steel bars and cold drawn low carbon steel wire has been phased out. Heat treatment of steel is hot rolled steel category.
The strength of hot-rolled steel grade from the I level, II level, III and IV grade level change in accordance with the yield strength (MPa) divided into 235, 335, 400, 500.
"Design of concrete structures" (GB50010-2002) section 4.2.1 provides that: ordinary steel hot-rolled ribbed steel bar should be adopted and HRB400 grade HRB335, also can use hot-rolled round bar HPB235 and heat treatment of steel RRB400 level; and provisions to promote the use HRB400 level description (the new class III) steel as the main force of China's steel reinforced concrete structure. The design specifications are not included in HRB500 grade steel. Cold-rolled and cold-rolled ribbed steel twisted bars, because of their special order "cold-rolled ribbed steel bar concrete structure with a point of order" (JGJ95-1995) and "Cold Rolled Technical Specification for Reinforced Concrete" (JGJ115-1997) for reference .
9-1-1-1 hot rolled steel
Hot-rolled steel is formed by hot rolling and cooling of the finished steel, divided into hot-rolled round bar and hot-rolled ribbed bar two. Hot rolled round bar should be consistent with national standards, "the reinforcement of concrete rolled round bar" (GB13013-1991) requirements. Hot rolled ribbed steel bar should be consistent with national standards, "the reinforcement of concrete rolled ribbed steel" (GB1499-1998) requirements.
1. Size, shape and weight
Diameter hot-rolled steel bars, cross-sectional area and weight, see Table 9-1. Hot rolled ribbed bar shape, shown in Figure 9-1.
Diameter hot-rolled steel bars, cross-sectional area and weight tables 9-1