GB/T 1499.3:2022 Steel for the reinforcement of concrete—Part 3:Welded fabric
1 Scope
This document specifies the classification and marking, order contents, technical requirements, test methods, test rules, packaging, marking and quality certificate of welded fabric for the reinforcement of concrete.
This document is applicable to the welded fabric made of cold rolled ribbed bars or (and) hot rolled plain bars and hot rolled ribbed bars by resistance welding (hereafter referred to as welded fabric), and may be referenced by the welded fabric made of other types of ribbed bars.
2 Normative references
The following documents contain requirements which, through reference in this text, constitute indispensable requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition (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 numberical values and judgment of testing values for technical standards of metallurgy
3 Terms and definitions
For the purpose of this document, the following terms and definitions apply.
3.1
welded fabric
fabric where the longitudinal bars and transverse bars are arranged at a certain distance and at right angles to each other, and all the intersection points are welded together by resistance spot welding. The shape of the welded fabric is shown in Figure 1.
Key:
b1——spacing between longitudinal bars;
b2——spacing between transverse bars;
u1——overhang of longitudinal bars;
u2——overhang of longitudinal bars;
u3——overhang of transverse bars;
u4——overhang of transverse bars;
B——width of fabric (length of transverse bars);
L——length of fabric (length of longitudinal bars);
Figure 1 Shape of welded fabric
3.2
longitudinal bars
bars arranged in parallel with the manufacturing direction of welded fabric
3.3
transverse bars
bars arranged vertical to the manufacturing direction of welded fabric
3.4
twin bars
two steel bars of the same type and the same nominal diameter that are closely tied together in welded fabric
Note: twin bars are only applicable to longitudinal bars.
3.5
spacing
distance between the center lines of adjacent bars in the same direction in the welded fabric. For twin bars, the center line is the common tangent of the contact points of two bars.
Note: See b1 and b2 in Figure 1 and b in Figure 2.
3.6
overhang
length of the longitudinal and transverse bars beyond the center line of the outermost transverse and longitudinal bars of the welded fabric
Note: See u1, u2, u3 and u4 in Figure 1 and u in Figure 2.
Figure 2 Spacing (b) and overhang (u)
3.7
length of fabric
length of the long side of the welded fabric plane (regardless of the manufacturing direction)
3.8
width of fabric
length of the short side of the welded fabric plane (regardless of the manufacturing direction)
Foreword I
Introduction II
1 Scope
2 Normative references
3 Terms and definitions
4 Classification and marking
5 Order content
6 Technical requirements
7 Test methods
8 Inspection rules
9 Packaging, marking and quality certificate
Annex A (Nominative) Model of finalized welded fabric
Annex B (Informative) Model of standard welded fabric for bridge deck and building
