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GB/T 1499.3-2022 English PDF (GBT1499.3-2022)

GB/T 1499.3-2022 English PDF (GBT1499.3-2022)

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GB/T 1499.3-2022: Steel for the reinforcement of concrete - Part 3: Welded fabric

This document specifies the classification and labeling, order content, technical requirements, test methods, inspection rules, packaging, marking and quality certificates of welded fabric for the reinforcement of concrete. This document applies to welded fabrics (hereinafter referred to as the welded fabric) made of cold-rolled ribbed steel bars or (and) hot-rolled round steel bars and hot-rolled ribbed steel bars by resistance welding. Welded fabrics welded with other types of bars can use this document as reference.
GB/T 1499.3-2022
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 77.140.60
CCS H 44
Replacing GB/T 1499.3-2010
Steel for the reinforcement of concrete - Part 3: Welded
fabric
ISSUED ON: OCTOBER 12, 2022
IMPLEMENTED ON: MAY 01, 2023
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword ... 3
Introduction ... 5
1 Scope ... 6
2 Normative references ... 6
3 Terms and definitions ... 6
4 Classification and labeling ... 8
5 Order contents ... 9
6 Technical requirements ... 9
7 Test methods ... 11
8 Inspection rules ... 14
9 Packaging, marking and quality certificate ... 17
Annex A (normative) Shaped welded fabric model ... 18
Annex B (informative) Standard welded fabric models for bridge decks and buildings ... 20
Steel for the reinforcement of concrete - Part 3: Welded
fabric
1 Scope
This document specifies the classification and labeling, order content, technical requirements, test methods, inspection rules, packaging, marking and quality certificates of welded fabric for the reinforcement of concrete.
This document applies to welded fabrics (hereinafter referred to as the welded fabric) made of cold-rolled ribbed steel bars or (and) hot-rolled round steel bars and hot-rolled ribbed steel bars by resistance welding. Welded fabrics welded with other types of bars can use this document as reference.
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 1499.1, Steel for the reinforcement of concrete - Part 1: Hot rolled plain bars GB/T 1499.2, Steel for the reinforcement of concrete - Part 2: Hot rolled ribbed bars GB/T 13788, Cold rolled ribbed steel bars
GB/T 17505, Steel and steel products - General technical delivery requirements GB/T 33365, Weld steel fabric for the reinforcement of concrete - Test methods YB/T 081, Rule for rounding off of numerical values and judgement of testing values for technical standards of metallurgy
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply. 3.1 welded fabric
A fabric in which the longitudinal bars and transverse bars are arranged at a certain interval and at right angles to each other, and all intersection points are welded together 4.2.2 The model of shaped welded fabric is in accordance with Annex A.
4.2.3 The shaped welded fabric shall be marked in the following order of content: Welded fabric model - steel designation in length direction ?? steel designation in width direction - length of fabric (mm) ?? width of fabric (mm)
Example: A10-CRB550??CRB550-4800mm??2400mm.
4.2.4 See Annex B for standard welded fabric models for bridge decks and buildings. 4.3 Customized welded fabric and labeling
The bars and their lengths and spacings used in the customized welded fabric shall be determined by negotiation between the supplier and the buyer according to the requirements of the buyer. They shall be represented by design drawings. 5 Order contents
The contract for ordering according to this document shall at least include the followings:
a) Reference to this document;
b) Product name;
c) Product category and mark (or with design drawing);
d) Weight (or quantity);
e) Special requirements.
6 Technical requirements
6.1 Bars
6.1.1 The welded fabric shall be made of CRB550 cold-rolled ribbed steel bars in accordance with GB/T 13788, CRB600H high-ductility cold-rolled ribbed steel bars, hot-rolled round steel bars specified in GB/T 1499.1, hot-rolled ribbed steel bars specified in GB/T 1499.2. When hot-rolled ribbed steel bars are used, steel bars without longitudinal ribs shall be used. After the agreement between the supplier and the buyer, and it is indicated in the contract, other designations of bars can also be used. 6.1.2 Bars with a nominal diameter of 5mm~18mm shall be used for the welded fabric. After the agreement between the supplier and the buyer, and it is indicated in the contract, the bars with other nominal diameters can also be used.
6.1.3 When the welded fabric is a single bar in both directions, the nominal diameter of the thinner bar shall not be less than 0.6 times the nominal diameter of the thicker bar. When longitudinal bars are used, the nominal diameter of longitudinal bar shall not be less than 0.7 times the nominal diameter of transverse bar. It is not more than 1.25 times the nominal diameter of the transverse bar.
After negotiation between the supplier and the buyer, and it is indicated in the contract, the welded fabric whose nominal diameter ratio exceeds the above-mentioned provisions can be supplied.
6.2 Manufacturing
6.2.1 The welded fabric shall be mechanically manufactured. The intersections of the bars in both directions are welded by resistance welding.
6.2.2 The number of welding points of welded fabric shall not exceed 1% of the total number of intersection points of the entire fabric. The welding points on any bar shall not exceed half of the total number of intersections on that bar.
The intersections on the outermost bars of the welded fabric shall not be welded. 6.3 Fabric size and allowable deviation
6.3.1 The longitudinal bar spacing of the welded fabric shall be an integral multiple of 50mm. The spacing of transverse bar shall be an integral multiple of 25mm. The minimum spacing shall be 100mm. The allowable deviation of the spacing takes the larger value of ??10mm and ??5% of the specified spacing.
6.3.2 The overhang of the bar shall not be less than 25mm.
6.3.3 The allowable deviation of the length and width of the fabric shall take the larger value of ??25mm and ??0.5% of the specified length and width.
6.3.4 The allowable deviation of the diagonal difference of the welded fabric (the difference between the two outermost diagonal welding points of the welded fabric) shall be ??0.5% of the specified diagonal.
6.3.5 The transverse rib height of welded fabric ribbed bar shall not be lower than 85% of the value specified in the corresponding product standard.
6.4 Weight and allowable deviation
6.4.1 The welded fabric shall be delivered by actual weight. It can also be delivered by theoretical weight.
6.4.2 The theoretical weight of the welded fabric is calculated according to the nominal diameter and specified size of the constituent bars. When calculating, the density of steel is 7.85g/cm3. The allowable deviation between the actual weight of the welded fabric and the theoretical weight shall be ??4%.
6.5 Performance requirements
6.5.1 The mechanical and technological properties of welded fabric bars shall comply with the provisions of the corresponding designations of the bars in the corresponding standards.
6.5.2 The shear resistance of the welded joints of the welded fabric shall not be less than 0.3 times the specified yield force value of the tensile bar of the specimen. 6.6 Surface quality
6.6.1 The surface of the welded fabric shall not have defects that affect the use. When the properties meet the requirements, rust on the surface of the bar and slight damage to the surface of the bar due to straightening shall not be used as a reason for rejection. 6.6.2 The welded fabric is allowed to have local vacancies due to sampling. 7 Test methods
7.1 Sampling method
7.1.1 Welded fabric specimens shall be taken from the finished fabric. However, the intersections contained in the specimen shall not be welded. Except for the removal of excess parts, the specimen shall not be subjected to other processing.
7.1.2 The schematic diagram of the specimen used in the tensile test is shown in Figure 3. One specimen shall be taken along both directions of the welded fabric. Each specimen has at least one intersection. The length of the specimen shall be sufficient to ensure that the distance between the clamps is not less than 20 times the nominal diameter of the sample (d) or 180mm (whichever is greater). For twin bars, the non- tensile bars shall be cut at about 20mm from the cross-welding point.
The transverse bars on the specimen for tensile test shall be cut off at a distance of about 25mm from the intersection.
quantity, conformity assessment criteria. They shall be indicated in the contract. 8.2 Routine inspection
8.2.1 Batching rules
The welded fabric shall be inspected and accepted in batches. Each batch shall consist of welded fabric of the same model, the same source of raw materials, the same production equipment and manufactured in the same continuous period of time. The weight is not more than 60t.
8.2 Inspection items
In addition to checking the number of welded joints, each batch of welded fabric shall be tested according to the items specified in Chapter 7.
8.2.3 Reinspection
If the tensile, bending and shear test results of welded fabric are rejected, double specimens shall be taken from the batch of welded fabric for inspection of rejected items. When the reinspection results are all accepted, the batch of welded fabric shall be accepted.
8.3 Inspection of eigenvalues
8.3.1 Inspection of applicability
The inspection of eigenvalues is suitable for the following situations: a) Supplier's inspection of product quality control;
b) Inspection required by the buyer and agreed upon by both parties;
c) Third-party product certification and arbitration inspection.
8.3.2 Evaluation of test results
8.3.2.1 Parameter inspection
To check the specified properties, such as the characteristic parameter specified plastic elongation strength (Rp0.2), tensile strength (Rm), elongation at break (A) or total elongation at maximum force (Agt), the following parameters shall be determined: a) All individual values Xi (i=1, 2, ?€?, n, n=15) for 15 specimens;
b) Average m15 (n=15);
c) Standard deviation S15 (n=15).

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