This document specifies the designation, dimensions, shape, weight and permissible deviation, raw materials and properties, test methods, inspection rules, packaging, marking and quality certificate of cold rolled ribbed steel bars (hereinafter referred to as steel bars).
This document is applicable to cold rolled ribbed steel bars for ordinary reinforced concrete, fabricating welded mesh and prestressed concrete.
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions 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 222 Permissible tolerances for chemical composition of steel products
GB/T 2101 General requirement of acceptance, packaging, marking, and certification for section steel
GB/T 2103 General requirements for acceptance, packing, marking and quality certification of steel wire
GB/T 17505 Steel and steel products - General technical delivery requirements
GB/T 21839 Test methods of steel for prestressing concrete
GB/T 28900 Test methods of steel for reinforcement 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 document, the following terms and definitions apply.
3.1
cold rolled ribbed steel bars
steel bar with transverse ribs uniformly distributed along the length on surface of hot-rolled wire rods after cold rolling
3.2
nominal diameter
diameter of circle with equal nominal cross sectional area of steer bar
3.3
specific projected rib area
the ratio of projected area of the rib on the plane vertical to steel bar axes to the product of nominal perimeter and rib spacing of steer bar
3.4
rib spacing
the projected chord length of the discontinuous part of the rib around the steel bar on the plane vertical to steel bar axes.
4 Designation
Foreword II 1 Scope 2 Normative references 3 Terms and definitions 4 Designation 5 Dimension, shape, weight and permissible tolerance 6 Raw materials and properties 7 Test methods 8 Inspection rules 9 Packaging, marking and quality certificate Annex A (Normative) Hot-rolled wire rods for cold rolled ribbed steel bars
GB 13788-2024 Cold rolled ribbed steel bars
1 Scope
This document specifies the designation, dimensions, shape, weight and permissible deviation, raw materials and properties, test methods, inspection rules, packaging, marking and quality certificate of cold rolled ribbed steel bars (hereinafter referred to as steel bars).
This document is applicable to cold rolled ribbed steel bars for ordinary reinforced concrete, fabricating welded mesh and prestressed concrete.
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions 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 222 Permissible tolerances for chemical composition of steel products
GB/T 2101 General requirement of acceptance, packaging, marking, and certification for section steel
GB/T 2103 General requirements for acceptance, packing, marking and quality certification of steel wire
GB/T 17505 Steel and steel products - General technical delivery requirements
GB/T 21839 Test methods of steel for prestressing concrete
GB/T 28900 Test methods of steel for reinforcement 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 document, the following terms and definitions apply.
3.1
cold rolled ribbed steel bars
steel bar with transverse ribs uniformly distributed along the length on surface of hot-rolled wire rods after cold rolling
3.2
nominal diameter
diameter of circle with equal nominal cross sectional area of steer bar
3.3
specific projected rib area
the ratio of projected area of the rib on the plane vertical to steel bar axes to the product of nominal perimeter and rib spacing of steer bar
3.4
rib spacing
the projected chord length of the discontinuous part of the rib around the steel bar on the plane vertical to steel bar axes.
4 Designation
Contents of GB 13788-2024
Foreword II
1 Scope
2 Normative references
3 Terms and definitions
4 Designation
5 Dimension, shape, weight and permissible tolerance
6 Raw materials and properties
7 Test methods
8 Inspection rules
9 Packaging, marking and quality certificate
Annex A (Normative) Hot-rolled wire rods for cold rolled ribbed steel bars
