GB/T 5224-2023 PDF English
US$320.00 · In stock · Download in 9 secondsGB/T 5224-2023: Steel strand for prestressed concrete Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB/T 5224: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 5224-2023 | English | 320 |
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Steel strand for prestressed concrete
| Valid |
| GB/T 5224-2014 | English | 85 |
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Steel strand for prestressed concrete
| Obsolete |
| GB/T 5224-2003 | English | 719 |
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Steel strand for prestressed concrete [including MODIFICATION 1]
| Obsolete |
| GB/T 5224-1995 | English | 399 |
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3 days
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Steel strand for prestressed concrete
| Obsolete |
| GB 5224-1985 | English | 199 |
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2 days
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Strand for prestressed concrete
| Obsolete |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: GB/T 5224-2023
GB/T 5224-2023: Steel strand for prestressed concrete---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT5224-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.65
CCS H 49
Replacing GB/T 5224-2014
Steel Strand for Prestressed Concrete
(ISO 6934-4.2020, Steel for the Prestressing of Concrete - Part 4.Strand, NEQ)
Issued on. AUGUST 6, 2023
Implemented on. MARCH 1, 2024
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 4
1 Scope... 7
2 Normative References... 7
3 Terms and Definitions... 7
4 Classification, Code and Labeling... 8
4.1 Classification and Code... 8
4.2 Labeling... 8
5 Order Content... 9
6 Dimensions, Cross-sectional Shape, Weight and Allowable Deviations... 10
7 Technical Requirements... 15
7.1 Manufacturing... 15
7.2 Mechanical Properties... 16
7.3 Surface Quality... 21
7.4 Straightness of Steel Strands... 21
7.5 Fatigue Properties, Deflection Tensile Properties and Stress Corrosion Properties... 21
8 Test Methods... 21
8.1 Surface Inspection... 21
8.2 Inspection of Overall Dimensions... 21
8.3 Measurement and Calculation of Enlargement Ratio of Center Steel Wire Diameter of
1 7 Structured Steel Strands... 22
8.4 Tensile Test... 22
8.5 Straightness... 23
8.6 Measurement and Calculation of Nominal Weight Deviation per Meter... 23
8.7 Test of Stress Relaxation Properties... 24
8.8 Fatigue Test... 24
8.9 Deflection Tensile Test... 25
8.10 Stress Corrosion Test... 25
8.11 Numerical Rounding... 25
9 Inspection Rules... 25
9.1 Classification of Inspection... 25
9.2 Delivery Inspection... 26
9.3 Eigenvalue Inspection... 27
10 Packaging, Marking and Quality Certificate... 27
10.1 Packaging... 27
10.2 Marking... 28
10.3 Quality Certificate... 28
Appendix A (normative) Eigenvalue Inspection Rules... 29
A.1 Test Batch... 29
A.2 Sampling and Inspection Quantity per Batch... 29
A.3 Evaluation of Test Results... 29
Bibliography... 31
1 Scope
This document specifies the classification, code and labeling, order content, dimensions, cross-
sectional shape, weight and allowable deviation, technical requirements, test methods,
inspection rules, packaging, marking and quality certificate of steel strand for prestressed
concrete.
This document is applicable to steel strand for prestressed concrete structures twisted from cold-
drawn round steel wires, indented steel wires and helical rib steel wires (hereinafter referred to
as the “steel strand”).
2 Normative References
The contents of the following documents constitute indispensable clauses of this document
through the normative references in the text. In terms of references with a specified date, only
versions with a specified date are applicable to this document. In terms of references without a
specified date, the latest version (including all the modifications) is applicable to this document.
GB/T 5223 Steel Wire for Prestressing of Concrete
GB/T 21839 Test Methods of Steel for Prestressing Concrete
YB/T 081 Rule for Rounding off of Numerical Values and Judgement of Testing Values for
Technical Standards of Metallurgy
3 Terms and Definitions
The following terms and definitions are applicable to this document.
3.1 standard strand
The steel strand twisted from cold-drawn round steel wires.
3.2 indented strand
The steel strand twisted from steel wires containing indentations.
3.3 helical rib strand
The steel strand twisted from steel wires containing helical ribs.
3.4 compact strand
The steel strand that is twisted, and then, cold-compacted.
3.5 nominal diameter
The nominal dimension of the diameter of the circumscribed circle of the steel strand.
3.6 stabilizing treatment
In order to reduce stress relaxation during application, the steel strand is subject to heat
treatment under a certain tension for a short period of time.
4 Classification, Code and Labeling
4.1 Classification and Code
The general structure of the steel strand is classified into the following 9 categories, and the
structure codes are.
4.2 Labeling
The labeling of products delivered in accordance with this document shall include the following
content.
5 Order Content
The order content includes, but is not limited to the following.
a) Serial No. of this document;
b) Product name;
c) Strength level;
d) Structure code;
e) Dimensions, length (or coil diameter) and weight (or quantity or coil weight) of the
steel strands;
f) Purpose.
6 Dimensions, Cross-sectional Shape, Weight and Allowable Deviations
6.1 The dimensions and allowable deviations, nominal cross-sectional area, and theoretical
weight per meter of the 1 2 structured steel strands are shown in Table 1, and the schematic
diagram of the cross-sectional shape is shown in Figure 1.
6.2 The dimensions and allowable deviations, nominal cross-sectional area, and theoretical
weight per meter of the 1 3 structured steel strands are shown in Table 2, and the schematic
diagram of the cross-sectional shape is shown in Figure 2.
6.9 The weight of each coil of the steel strands is not less than 1,000 kg. When there are no less
than 10 coils, 10% of the number of coils of the steel strands is allowed to be less than 1,000
kg, but not less than 300 kg.
7 Technical Requirements
7.1 Manufacturing
7.1.1 The steel strands should be manufactured by wire rods of designations that comply with
the stipulations of GB/T 24238 or GB/T 24242.2 and GB/T 24242.4.Wire rods of other
designations can also be adopted. The manufacturer does not provide the chemical composition.
7.1.2 The steel strands shall be manufactured with wire rods as the raw material, which are
subject to surface treatment and cold-drawing, and then, twisted into steel strands. After
twisting, the steel strands shall undergo continuous stabilizing treatment.
7.1.4 The twist direction of the helical rib steel strands shall be the same as the helical ribs.
7.1.6 There shall be no broken, transverse cracks or intersecting wires in the steel strands.
7.1.7 The twist direction of the steel strands is generally left (S) twist, and right (Z) twist shall
be indicated in the contract.
7.2.5 The elastic modulus of the steel strands is (195 10) GPa, which is not required as a
delivery condition. When required by the demand-side, this range shall be satisfied. If it exceeds
this range, with reference to the stipulations of GB/T 21839, in the stress - strain curve, the
slope value of the straight-line segment within the range of 0.2Fm ~ 0.7Fm can be re-corrected
and select the best fit to obtain it.
7.2.6 In accordance with the agreement between the demand-side and the supply-side, steel
strands with strength levels other than Table 7 ~ Table 10 can be provided.
7.2.7 If there are no special requirements, only the relaxation test with an initial force of 70%
Fma is performed, and the reckoning algorithm is allowed to be used to conduct a 120-h
relaxation test to determine the 1,000-h relaxation rate. There is no requirement for the
relaxation rate of the steel strands used for mine support.
7.3 Surface Quality
7.3.1 Unless the user has special requirements, there shall be no oil, grease and other substances
on the surface of the steel strands.
7.3.2 There shall be no detrimental defects that may affect the performance on the surface of
the steel strands. Axial surface defects are allowed, but their depth shall be less than 4% of the
diameter of a single steel wire.
7.3.4 Tempering color is allowed on the surface of the steel strands.
7.4 Straightness of Steel Strands
The straightness of the steel strands shall not be greater than 25 mm.
7.5 Fatigue Properties, Deflection Tensile Properties and Stress Corrosion Properties
Through negotiation between the demand-side and the supply-side, and statement in the
contract, axial fatigue test, deflection tensile test and stress corrosion test can be carried out.
8 Test Methods
8.1 Surface Inspection
Conduct visual inspection on the surface quality.
8.2 Inspection of Overall Dimensions
8.2.1 The diameter of the steel strands shall be measured with a measuring tool with a division
value of not greater than 0.02 mm. The distance between the measurement position and the end
shall not be less than 300 mm.
8.4 Tensile Test
8.4.1 General requirements
In accordance with the stipulations of GB/T 21839, anchor clamps for prefabricated field-
tensioned steel strands shall not be used for the tensile test on the steel strands.
The design of the clamping device shall ensure that during the test, the load is distributed along
the entire clamping length, and the minimum effective clamping length shall not be less than
one lay length of the steel strands.
8.4.2 Maximum force
The maximum force test of the whole steel strands shall be carried out in accordance with the
stipulations of GB/T 21839.When calculating the tensile strength, take the nominal cross-
sectional area value of the steel strands.
8.4.4 Total elongation of maximum force
The total elongation Agt of the maximum force is determined in accordance with the stipulations
of GB/T 21839.If a computer is used to collect data or an electronic tensile equipment is used,
when measuring the elongation, the elongation caused by the preload on the specimen shall be
added to the total elongation.
8.4.5 Elastic modulus
The elastic modulus is determined in accordance with the stipulations of GB/T 21839.
8.5 Straightness
The straightness measurement of the steel strands shall be carried out in accordance with the
stipulations of GB/T 21839.
8.6 Measurement and Calculation of Nominal Weight Deviation per Meter
8.6.3 The measured unit weight is the average value of three calculated values.
8.6.4 To calculate the nominal weight deviation per meter, the difference between the average
measured unit weight of the specimens and the corresponding nominal weight per meter
provided in this document shall be divided by the corresponding nominal weight per meter. The
percentage of the calculation result is the nominal weight deviation per meter.
8.7 Test of Stress Relaxation Properties
8.7.1 The test of stress relaxation properties of the steel strands shall be carried out in
accordance with the stipulations of GB/T 21839.
8.7.2 The test gauge length shall not be less than 60 times the nominal diameter.
8.8 Fatigue Test
8.8.1 The specimens used for the fatigue test are specimens taken directly from the finished
steel strands. The length of the specimens shall ensure that the distance between the two clamps
is not less than 500 mm or twice the lay length (whichever is the larger value).
8.8.4 The fatigue test shall be carried out in accordance with the stipulations of GB/T 21839.
8.9 Deflection Tensile Test
The deflection tensile coefficient D of the general-purpose steel strands shall be 28%; the
deflection tensile coefficient D of the steel strands used for stay cables shall be 20%. The
deflection tensile test shall be carried out in accordance with the stipulations of GB/T 21839.
8.11 Numerical Rounding
The numerical rounding and judgement of the inspection results shall comply with the
stipulations of YB/T 081.
9 Inspection Rules
9.1 Classification of Inspection
The inspection of the steel strands is classified into delivery inspection and eigenvalue
inspection.
9.2 Delivery Inspection
9.2.1 Inspection and acceptance
The factory inspection of the product is carried out by the supply-side’s quality inspection
department in accordance with Table 12, and the demand-side may conduct inspection and
acceptance in accordance with this document.
9.2.2 Batch rules
The steel strands shall be inspected and accepted in batches. Each batch is composed of steel
strands of the same designation, same diameter and twisted by the same production process.
The weight of each batch shall not exceed 100 t.
9.2.3 Inspection items and sampling size
The requirements for the inspection items and sampling size are as follows.
9.3 Eigenvalue Inspection
9.3.1 The eigenvalue inspection is applicable to the following circumstances.
9.3.2 The eigenvalue inspection shall be performed in accordance with the rules in Appendix A.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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