This standard specifies the terms and definitions, classification, code and marking, order contents, dimension, shape, weight and permissible deviation, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of steel bars for the prestressing of concrete.
This standard is applicable to the plain bar, helical grooved bar, helical ribbed bar, and ribbed bar for the prestressing of concrete.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 229 Metallic materials—Charpy pendulum impact test method
GB/T 2101-2008 General requirement of acceptance packaging, marking and certification for section steel
GB/T 2103-2008 General requirement of acceptance packaging, marking and certification for section steel
GB/T 14981-2009 Dimensions, shape, mass and tolerances for hot-rolled round wire rod
GB/T 21839 Steel for prestressed concrete—Test methods
GB/T 24587 Hot-rolled wire rods for prestressing steel bars of concrete
YB/T 081 Rule for rounding off of numerical values and judgment of testing values for technical standards of metallurgy
3 Terms and definitions
For the purposes of this standard, the following terms and definitions apply.
3.1
quenched & tempered bar
steel bar that is obtained in the process of the wire rod is heated to austenitizing temperature and then rapidly cooled, and then heated and tempered below the intersection temperature.
3.2
relaxation
phenomenon that stress decreases with time at a constant length.
3.3
plain bar
steel bar with a circular cross section.
3.4
helical grooved bar
steel bar with a continuous helical groove at regular intervals along the longitudinal direction of the surface [see Figure 1a), and Figure 1b)].
3.5
helical ribbed bar
steel bar with a continuous helical rib at regular intervals along the longitudinal direction of the surface (see Figure 2).
3.6
ribbed bar
steel bar with a generally circular cross section and a ribbed surface [see Figure 3a), and Figure 3b)].
3.7
longitudinal rib
uniform continuous rib parallel to the axis of the steel bar.
3.8
transverse rib
other ribs that are not parallel to the axis of the steel bar.
GB/T 5223.3-2017 The following standards are cited：
