Standards for reinforcement

Standards relating to concrete reinforcing and prestressing are:

EN 10138 - Prestressing Steel

Prestressing steels is in four parts:

  • EN 10138-1. Prestressing steels. General requirements
  • EN 10138-2. Prestressing steels. Wire
  • EN 10138-3. Prestressing steels. Strand
  • EN 10138-4. Prestressing steels. Bars

These parts are currently under development.

EN 10080: Steel for the reinforcement of concrete, weldable, ribbed reinforcing steel

BS EN 10080:2005

Weldable steel for the reinforcement of concrete has become subject to the European Standard, BS EN 10080. This standard went back and forth over many years seeking a pragmatic agreement amongst Europeans on how to standardise reinforcement. In other words, it has taken a long time to move from being a mandated standard (one that the European Commission asked CEN to prepare) to being a harmonised standard. In 2008 it had to be withdrawn as a harmonized standard because some countries legal requirements for additional properties of reinforcement were not met. However, it was implemented in the UK in late 2005 and its subsequent withdrawal has no effect on BS 4449 etc.

BS EN 10080:2005 gives no actual specification or figures; that is left to the National Standards.

Requires that technical classes should be specified by values of:

  • Re, yield strength;
  • Rm/ Re, Ratio of tensile strength/Yield strength,
  • Agt, Percentage total elongation at maximum force,
  • Re,act/ Re,nom(where appropriate), Ratio of actual to specified value of yield strength,
  • fatigue strength,
  • bend performance,
  • weldability,
  • bond strength,
  • tolerances and
  • dimensions.

It contains an informative Annex ZA, which describes how the standard may be used for the purposes of CE marking. Please note that the CE mark isnota quality mark. It merely identifies the product as complying with the essential requirement laid down by the European Commission in their 'mandate' to CEN. CE marking is not a requirement of BS 4449:2005 and reinforcement cannot be CE marked as the harmonised standard has been withdrawn.

BS EN ISO 17660: Welding of Reinforcing Steel

This standard has two parts:

  • BS EN ISO 17660-1:2006. Welding. Welding of reinforcing steel - Load-bearing welded joints
  • BS EN ISO 17660-2:2006. Welding. Welding of reinforcing steel - Non load-bearing welded joints

BS 4449: 2005 Steel for the reinforcement of concrete weldable reinforcing steel, bar, coil and decoiled product

This was a full revision of the standard and defines three grades of reinforcement conforming to the now withdrawn BS EN 10080: B500A, B500B and B500C. The characteristic yield strength is set at 500 MPa and the tensile properties and ductility of the three grades are described in Table 1.

Characteristic tensile properties

Grade

Yield Strength

Re

MPa

Tensile/yield strength ratio

Rm/ Re

Total elongation at maximum force, Agt

%

B500A

500

1.05a

2.5b

B500B

500

1.08

5.0

B500C

500

1.15, < 1.35

7.5

aRm/ Rc特点是1.02尺寸8毫米以下

bAgtcharacteristic is 1.0% for sizes below 8 mm

Values of Rcspecified are characteristic withp= 0.95

Values of Rm/ Rc和gtspecified are characteristic withp= 0.90

Calculate the values of Rm和rcusing the nominal cross sectional area

屈服强度的绝对最大允许值为650 MPa。

这三个等级符合BS 1992-1-1：2004（Eurocode 2）的三个建议的延展性类别。应该注意的是，直径低于8mm，将钢加固至BS 4449不符合BS EN 1992-1-1相对于延展性。这不是BS 4449：2005必须考虑到BS EN 1992-1-1的要求的唯一场合。例如，Eurocode 2的范围仅限于肋骨加固，其强度在400至600 MPa之间。因此，平原圆条（250级）从BS 4449中删除（无论如何它在结构应用中的使用情况都处于严重下降：它通常更昂贵，并且在链接中弯曲半径等不再具有任何优势）。

BS 4449:2005 uses the term 'bar' for ribbed reinforcing steel. The terms 'rod' and 'wire' should be restricted to describe reinforcing steel in coil, or wire in reinforced concrete products.

BS 4482: 2005 Steel wire for the reinforcement of concrete products - Specification

This standard incorporates plain, indented and ribbed wire, coiled or decoiled. Grade 250 has been incorporated. The characteristic strength of the high yield steel has been set at 500 MPa and the ductility aligned with B500A in BS 4449:2005, but no fatigue performance is specified.

Most wire to BS 4482 is unlikely to comply with BS EN 1992-1-1. To avoid any confusion, any design to BS EN 1992-1-1:2004 should have reinforcement specified to BS 4449:2005. Similarly any fabric used for structural purposes should be manufactured to BS 4483 using material specified to BS 4449:2005.

BS 4483: 2005 Steel fabric for the reinforcement of concrete - Specification

Apart from wrapping fabrics D49 and D98, fabric will be made from and evaluated as BS 4449:2005 material. A requirement for the strength of welded joints in BS EN 1992-1-1 has necessitated the withdrawal of A98 and B196 and has increased the diameter of transverse bars in some other designated fabric types.

BS 5896:2012 High tensile steel wire and strand for the prestressing of concrete.

该标准提供了未涂层的高拉伸强度钢丝和链链的要求，用于预应力混凝土。可以使用EN10138标准进行准备时使用它。

BS 8666: 2005 Specification for scheduling, dimensioning, bending and cutting of steel reinforcement for concrete

The 2005 revision of this code was produced in order to comply with the anticipated implementation of EN 10800, and this revision incorporates:

  • Shape codes available under BS EN ISO 3766:2003.
  • Revised notation in accordance with BS4449:2005 and BS EN 10080:2005.
  • Revisions to BS4449:2005 (including the omission of grade 250 reinforcement), BS4482:2005 and BS4483:2005.
  • EN 1992-1-1的规定（包括将电线排除在BS 4482：2005用于结构目的）。
  • Measurement of properties of decoiled material
  • Inspection frequencies of component dimensions.

BS 7123：用亚博会员vip6于混凝土钢筋的钢金属电弧焊接规范

This standard has been withdrawn and reference should be made to BS EN ISO 17660.