GB/T 33363-2016 PDF in English
GB/T 33363-2016 (GB/T33363-2016, GBT 33363-2016, GBT33363-2016)
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Hot-dip galvanized steel strand for prestress
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Standards related to (historical): GB/T 33363-2016
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GB/T 33363-2016: PDF in English (GBT 33363-2016) GB/T 33363-2016
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.65
H 49
Hot-Dip Galvanized Steel Strand for Prestress
ISSUED ON: DECEMBER 30, 2016
IMPLEMENTED ON: SEPTEMBER 01, 2017
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Terms and Definitions ... 4
4 Classification and Sign ... 5
5 Ordering Contents ... 5
6 Size, Weight and Permissible Deviation ... 6
7 Technical Requirements ... 6
8 Test Methods ... 9
9 Inspection Rules ... 11
10 Package, Marking and Quality Certificate ... 12
Hot-Dip Galvanized Steel Strand for Prestress
1 Scope
This Standard specifies the terms and definitions, classification and sign, ordering
contents, size, weight and permissible deviation, technical requirements, test methods,
inspection rules, package, marking, and quality certificate, etc. of hot-dip galvanized
steel strand for prestress.
This Standard is applicable to the low-relaxation prepressed steel strands (hereinafter
referred to as “steel strands”) consisting of seven hot-dip galvanized round steel wires,
with diameters of 12.7mm, 15.2mm, 15.7mm, 17.8mm, and strength levels of
1770MPa, 1860MPa, 1960MPa, used for bridge cables, anchoring tensile members,
buildings for lifting or fixing tensile members, and other prestressed structures not
directly in contact with the concrete mortar.
2 Normative References
The following documents are essential to the application of this document. For the
dated documents, only the versions with the dates indicated are applicable to this
document; for the undated documents, only the latest version (including all the
amendments) are applicable to this document.
GB/T 470 Zinc Ingots
GB/T 1839 Test Method for Gravimetric Determination of Mass per Unit Area of
Galvanized Coatings Steel Products
GB/T 2972 Test Method for Uniformity of Zinc Coating on Zinc-Coated Steel Wire
by the Copper Sulphate Dip
GB/T 2976 Metallic materials - Wire - Wrapping test
GB/T 21839 Steel for Prestressed Concrete - Test Methods
GB/T 24238 Hot-rolled wire rod for prestressed steel wire and strand
3 Terms and Definitions
For the purposes of this document, the following terms and definitions apply.
7.2.3 Requirements for relaxation test
Use 70% of the nominal breaking force of the hot-dip galvanized steel strand as the
initial force of the relaxation test. The duration of the relaxation test shall be 1000h. On
the basis of ensuring the 1000h relaxation qualified, the test value of the shorter period
of at least 120h may also be used to estimate the relaxation value of 1000h.
7.2.4 Other special requirements
After the negotiation between the supplier and the purchaser, the galvanized steel
strands with other special requirements can be supplied.
7.2.5 Slanting tension coefficient
For the hot-dip galvanized steel strand used for general purpose, its slanting tension
coefficient shall be no greater than 28%.
For the hot-dip galvanized steel strand used for cables, its slanting tension coefficient
shall be no greater than 20%.
7.2.6 Fatigue performance
7.2.6.1 The hot-dip galvanized steel strand for general purpose shall not break after
being applied a load of 2 million times 0.7Fm~(0.7Fm~2ΔFa). The fatigue stress
amplitude shall be calculated as per the Formula (1):
Where:
Sn – nominal cross-sectional area of the hot-dip galvanized steel strand, in mm2;
2ΔFa – load value of the fluctuating stress amplitude, in N.
7.2.6.2 The hot-dip galvanized steel strand for cables shall not break after being
applied a load of 2 million times 0.45Fm~(0.45Fm~2ΔFa). The fatigue stress amplitude
shall be calculated as per the Formula (2):
Where:
Sn – nominal cross-sectional area of the hot-dip galvanized steel strand, in mm2;
2ΔFa – load value of the fluctuating stress amplitude, in N.
test is invalid, and shall take samples again to do the test.
8.1.2 Maximum force total elongation
8.1.2.1 Determination of maximum force total elongation, Agt, shall be carried out as
per GB/T 21839; the gauge length is no less than 500mm.
8.1.2.2 The actual measurement may be performed by adding 1% of the yield
elongation plus the percentage between elongation of the jaw spacing and the new
spacing of the clamps.
8.1.3 Specified non-proportional extension force
8.1.3.1 Determination of the specified non-proportional extension force shall be carried
out as per the provisions of GB/T 21839; the applied force, Fp0.2, when the non-
proportional extension using the gauge length of the extensometer to reach the 0.2%
gauge-length of the extensometer.
8.1.3.2 When the supplier performs the production inspection, the load, Ft1, may be
measured, if the total extension reaches 1% original gauge length; if such value
conforms to the provision of Table 2, the product can be delivered; however, the Fp0.2
shall be measured during arbitration.
8.1.4 Elastic modulus
Measurement of elastic modulus shall be carried out as per the provisions of GB/T
21839.
8.2 Relaxation test
8.2.1 The stress relaxation test of the steel strand shall be carried out as per the
provisions of GB/T 21839.
8.2.2 The galvanized layer on the sample surface at the clamping part of the anchorage
shall be cleaned with dilute acid before test; and corrosion of the steel base shall be
avoided.
8.3 Slanting tension test
The slanting tension test shall be carried out as per the provisions of GB/T 21839.
8.4 Fluctuating tensile fatigue test
The fluctuating tensile fatigue test shall be carried out as pe the provisions of GB/T
21839.
8.5 Zinc layer weight
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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