GB/T 1499.3-2010 (GB/T 1499.3-2022 Newer Version) PDF English
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Steel for the reinforcement of concrete - Part 3: Welded fabric
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| GB/T 1499.3-2010 | English | 85 |
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Steel for the reinforcement of concrete -- Part 3: Welded fabric
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Welded steel fabric for the reinforcement of concrete
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GB/T 1499.3-2010: PDF in English (GBT 1499.3-2010) GB/T 1499.3-2010
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.60
H 44
Replacing GB/T 1499.3-2002
Steel for the Reinforcement of Concrete
- Part 3. Welded Fabric
(ISO 6935-3.1992, NEQ)
ISSUED ON. DECEMBER 23, 2010
IMPLEMENTED ON. SEPTEMBER 1, 2011
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine (AQSIQ);
Standardization Administration (SAC) of the People's
Republic of China.
Table of Contents
1 Scope ... 5
2 Normative References ... 5
3 Terms and Definitions ... 5
4 Classification and Marking ... 7
5 Ordering Information ... 8
6 Technical Requirements ... 8
7 Test Methods ... 10
8 Inspection Rules ... 13
9 Package, Marking and Inspection Certificate ... 15
Appendix A (Normative) Standardized Welded Fabric Type ... 16
Appendix B (Informative) Standard Welded Fabric Used for Bridge Surface and
Buildings... 18
Appendix C (Informative) Sketch map of Recommended Special Fixture for Shear
Test... 20
Foreword
GB/T 1499 is divided into three parts.
— Part 1. Hot Rolled Plain Bars;
— Part 2. Hot Rolled Ribbed Bars;
— Part 3. Welded Fabric.
This Part is Part 3 of GB 1499; it is corresponding to international standard ISO
6935-3.1992 Steel for the Reinforcement of Concrete - Part 3. Welded Fabric. The
consistent degree with ISO 6935-3.1992 is not equivalent.
This Part was drafted according to the rules specified in GB/T 1.1-2009.
This Part replaces GB/T 1499.3-2002 Welded Steel Fabric for the Reinforcement of
Concrete.
Compared with GB/T 1499.3-2002, the main changes in this Part are as follows.
— Change the standard name;
— Diagram of twin bars welded fabric was added in Figure 2;
— Diameter range of bars used for welded fabric was changed to 5mm~18mm;
— The permissible deviation of the actual weight and theoretical weight of welded
fabric was changed to ±4.0%;
— Where cold rolled ribbed steel wires and bars with nominal diameter larger than
or equal to 6mm are used for welding fabric, requirements for the elongation
rate at the maximum force and the yield limit of cold rolled ribbed steel wires and
bars were added;
— Sampling method of weight deviation was modified;
— 7.2.1 inspection items were added;
— Calculation formula of weight deviation was added;
— Eigenvalue test was added;
— The acceptance batch weight was modified;
— Appendix A Type F Series of Standardized Welded Fabric was added;
Steel for the Reinforcement of Concrete
- Part 3. Welded Fabric
1 Scope
This Part of GB/T 1499 specifies the definition, classification and marks, ordering
information, technical requirements, test methods, inspection rules, packing marks
and inspection certificate of welded steel fabric for the reinforcement of concrete.
This Part is applicable to welded fabric manufactured by cold rolled ribbed steel wires
and bars or (and) hot-rolled ribbed bars in a method of resistance welding and may be
referred by welded fabric welded by bars with smooth surface or of other types.
2 Normative References
The following referenced documents are indispensable for the application of this
document. For dated references, only the dated edition is applicable to this document.
For undated references, the latest edition of the normative document (including all the
amendments) referred to applies.
GB/T 228.1 Metallic Materials - Tensile Testing - Part 1. Method of Test at Room
Temperature (GB/T 228.1-2010, ISO 6892-1.2009, MOD)
GB/T 232 Metallic Materials - Bend Test (GB/T 232-1999, eqv ISO 7438.1985 (E))
GB 1499.2 Steel for the Reinforcement of Concrete - Part 2. Hot Rolled Ribbed
Bars
GB 13788 Cold Rolled Ribbed Steel Wires and Bars
GB/T 17505 Steel and Steel Products - General Technical Delivery Requirements
YB/T 081 Rule for Rounding Off of Numerical Values and Judgment of Testing
Values for Technical Standards of Metallurgy
3 Terms and Definitions
The following terms and definitions apply.
3.1 Welded fabric
5 Ordering Information
Order contract in accordance with this Part shall at least include the following content.
a) Serial number of this Part;
b) Product name;
c) Product class and mark (attached with design drawing);
d) Weight (or quantity);
e) Special requirements.
6 Technical Requirements
6.1 Bars
6.1.1 CRB 550 cold rolled ribbed steel wires and bars specified by GB 13788 and
hot-rolled ribbed bars specified by GB 1499.2 shall be adopted for welded fabric.
Where hot-rolled ribbed bars are adopted, they shall be free from vertical ribs.
6.1.2 Bars with nominal diameter of 5mm~18mm shall be adopted for welded fabric.
Bars with other nominal diameter may also be adopted upon the agreement of the
supplier and the purchaser.
6.1.3 Where single bar used for both direction of welded fabric, the nominal
diameter of the thinner bar shall not be 0.6 times less than the thicker one.
Where twin bars are adopted for longitudinal bars, the nominal diameter of
longitudinal bars shall not be 0.7 times less than or 1.25 times less than that of the
transverse bars.
Welded fabric with diameter ratio beyond said specification may be supplied upon the
agreement of the supplier and the purchaser.
6.2 Manufacture
6.2.1 Welded fabric shall be manufactured by machine and the cross point of bars in
two directions shall be welded by electric resistance welding.
6.2.2 The sealing off quantity of welding spot at welded fabric shall not be greater
than 1% of the total cross points on the entire fabric and the sealing off point on any
bar shall not be greater than half of the total cross point on this bar.
Cross point on the outer most bar of welded fabric shall be free from sealing off.
6.3 Dimension and permissible deviation
6.3.1 The longitudinal bars spacing of welded fabric should be integral multiple of
50mm; the transverse bars spacing should be integral multiple of 25mm; the minimum
spacing should be 100mm and the permissible deviation of spacing should be the
larger value of ±10mm and ± 5% of specified spacing.
6.3.2 Overhang of bars should not be less than 25mm.
6.3.3 The permissible deviation of length and width of fabric should be the larger
value of ±25mm and ±0.5% of the specified length.
6.4 Weight and permissible deviation
6.4.1 The welded fabric should be delivered according to actual weight or may be
delivered according to theoretical weight.
6.4.2 Theoretical weight of welded fabric is calculated according to the nominal
diameter and given size of bars and the steel density take 7.85 g/m3 for calculation.
The permissible deviation of the actual weight and theoretical weight of welded fabric
is ±4.0%.
6.5 Performance requirements
6.5.1 The mechanical and processing properties of welded fabric bars shall meet
the requirements of corresponding designation of bars in corresponding standards
respectively. For the cold rolled ribbed steel wires and bars with nominal diameter
larger than or equal to 6mm and used for welded fabric, the total elongation rate (Agt)
at the maximum force shall not be less than 2.5 and the yield limit Rm/Rp0.2 of bars
shall not be less than 1.05.
6.5.2 The shearing resistance of welded fabric welding spot shall not be less than
0.3 times of the yield force specified by tension bar.
6.6 Surface quality
6.6.1 The surface of welded fabric shall be free from any defect that affecting use.
Where the performance meet relevant requirements, floating rust on the bar surface
and negligible injury caused by straightening shall not be regarded as reasons for
rejection.
6.6.2 Partial vacancy caused by sampling is allowed for welded fabric.
shearing resistance of three samples (accurate to 0.1kN).
7.2.5 Weight deviation
Deviation of the actual weight and theoretical weight shall be calculated according to
Formula (1).
%100sample entire the on bar each of weightltheoretica × length Total
sample) entire the on bar each of weightltheoretica×length (total - sample of weightactual Totaldeviation Weight
... (1)
7.3 Rounding off of numerical values
The rounding off of numerical values and judgment of inspection result shall meet the
requirements of YB /T 081.
8 Inspection Rules
8.1 General requirements
The delivery inspection and customer acceptance of welded fabric shall be carried out
according to the requirements of 8.2. Where other plans are required for inspection
and acceptance, the main content of sampling inspection plan shall be determined
upon the negotiation of the supplier and the purchaser according to the requirements
of GB/T 17505, such as batching rules, inspection items, sampling quantity and
conformity assessment criteria which shall be noted in the contract.
8.2 Routine inspection
...
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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