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GB/T 14370-2015 English PDF (GBT14370-2015)

GB/T 14370-2015 English PDF (GBT14370-2015)

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GB/T 14370-2015: Anchorage, grip and coupler for prestressing tendons

This standard specifies terms and definitions, symbols, product classification, code and marking, general requirements, requirements, test methods, inspection rules and marking, packaging, transport and storage of anchorage, grip and coupler for prestressing tendons. This standard applies to anchorages and couplers used for the anchorage, grip, coupler and cable used in the prestressed structure of internal and external reinforcement with bonding, without bonding, or with slow bonding AND in the special construction process.
GB/T 14370-2015
GB
NATIONAL STANDARD
OF THE PEOPLE REPUBLIC OF CHINA
ICS 91.080.40
Q 73
Replacing GB/T 14370-2007
Anchorage, grip and coupler for prestressing tendons
ISSUED ON. SEPTEMBER 11, 2015
IMPLEMENTED ON. AUGUST 01, 2016
Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of China.
Table of contents
Foreword ... 3
1 Scope ... 6
2 Normative references ... 6
3 Terms and definitions, symbols ... 7
4 Product classification, code and marking ... 11
5 General requirements ... 13
6 Requirements ... 15
7 Test methods ... 18
8 Inspection rules ... 28
9 Marking, packaging, transport and storage ... 32
Appendix A (Normative) Test method for force transmission performance of anchorage zone ... 34
Appendix B (Normative) Test method for low temperature anchoring
performance ... 43
Appendix C (Normative) Draw-in test method ... 48
Appendix D (Normative) Test method for prestress loss due to friction at anchorage device ... 52
Foreword
This standard was drafted in accordance with the rules given in GB/T
1.1-2009.
This standard is the revision of GB/T 14370-2007 ?€?Anchorage, grip and coupler for prestressing tendons?€?; AND as compared with GB/T 14370-2007, the main technical changes are as follows.
- MODIFY the scope (SEE Chapter 1; Chapter 1 of the 2007 version);
- MODIFY the terms and definitions, symbols (SEE Chapter 3; Chapter 3 of the 2007 version);
- MODIFY the product classification, code and markings (see Chapter 4,
Chapter 4 of the 2007 version);
- DELETE the ?€?requirements of use?€? (SEE 5.1 of the 2007 version);
- MODIFY the parts forging blank requirements (SEE 5.12; 5.3.4 of 2007
version);
- ADD the performance requirements for bearing plate material (SEE 5.1.3); - ADD the requirements for rust treatment (SEE 5.2.5);
- MODIFY the requirements and test methods for static load anchorage
performance (SEE 6.1.1 and 7.3; 5.5.1 and 6.2 of 2007 version);
- MODIFY the requirements and test methods for fatigue load performance (SEE 6.12 and 7.4; 5.5.2 and 6.3.1 of 2007 version);
- DELETE the periodic load performance and its test methods and
associated inspection rules (SEE 5.5.3, 6.4 and 7 of 2007 version);
- ADD the requirements and test methods for force transmission
performance in anchorage zones (SEE 6.1.3 and Appendix A);
- ADD the requirements and test methods for low temperature anchorage
performance (SEE 6.1.4 and Appendix B);
- ADD the requirements and test methods for bearing plate strength (SEE 6.1.5 and 7.7);
- MODIFY the requirements and test methods for internal shrinkage (SEE
6.1.6 and Appendix C; 5.5.4.1 and 6.6.1 of 2007 version);
Anchorage, grip and coupler for prestressing tendons
1 Scope
This standard specifies terms and definitions, symbols, product classification, code and marking, general requirements, requirements, test methods,
inspection rules and marking, packaging, transport and storage of anchorage, grip and coupler for prestressing tendons.
This standard applies to anchorages and couplers used for the anchorage, grip, coupler and cable used in the prestressed structure of internal and external reinforcement with bonding, without bonding, or with slow bonding AND in the special construction process.
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 Standard.
GB/T 197 Common thread - Tolerances
GB/T 230.1 Metallic materials - Rockwell hardness test - Part 1. Test
methods (A, B, C, D, E, F, G, H, K, N, T)
GB/T 231.1 Metallic materials - Brinell hardness test - Part 1. Test methods GB/T 1348 Spheroidal graphite iron castings
GB/T 1804 General tolerances - Tolerances for linear and angular
dimensions without individual tolerance indications
GB/T 5223 Steel wire for prestressing of concrete
GB/T 5223.3 Steel bars for prestressed concrete
G/T 5224 Steel strand for prestressed concrete
GB/T 9439 Gray iron castings
GB/T 9969 General principles for preparation of instructions for use of industrial products
GB/T 12361 General specification of steel die forgings
GB/T 15822.1 Non-destructive testing - Magnetic particle testing - Part 1. General principles
GB/T 16825.1 Verification of static uniaxial testing machines - Part 1. Tension/compression testing machines - Verification and calibration of the force-measuring system
GB/T 16923 Normalizing and annealing of steel parts
GB/T 16924 Quenching and tempering of steel parts
GB/T 20065 Screw-thread steel bars for the prestressing of concrete
GB/T 21839 Steel for prestressed concrete - Test methods
GB/T 26743 Fiber reinforced composite bars for civil engineering
JB/T 5000.8 General technical requirements for heavy machinery - Part 8. Forgings
JB/T 5000.9 General technical requirements for heavy machinery - Part 9. Cutting workpieces
JB/T 5000.10 General technical requirements for heavy machinery - Part 10. Assembly
JB/T 5000.13 General technical requirements for heavy machinery - Part 13. Packaging
JB/T 5000.15 General specification for heavy machinery - Part 15.
Nondestructive testing of steel forgings
JG/T 330 Construction of cable
JG/T 351 Fiber reinforced composite standard
3 Terms and definitions, symbols
The following terms and definitions apply to this document.
3.1 terms and definitions
3.1.1
plate for the purposes of improving the concrete cracking resistance and ultimate bearing capacity of the anchorage zone.
3.1.15
Draw-in
It refers to the shrinkage of the prestressing tendon in the anchoring
process of the prestressing tendon due to the relative displacement and the local plastic deformation between different components of the anchorage AND between the anchorage and prestressing tendon.
3.1.16
Prestress loss due to friction at anchorage device
It refers to the prestress loss of the prestressing tendon at the anchorage and the corner of the tensioning end bearing plate flange mouth due to
friction.
3.2 Symbols
The following symbols apply to this document.
Apk - The nominal cross-sectional area of the prestressing tendons, in square millimeters (mm2);
Fpm - The measured mean ultimate tensile strength of a single sample of prestressing tendons, in kilo-Newton (kN);
Fptk - The nominal ultimate tensile strength of prestressing tendons, in kilo-Newton (kN);
FTu - The measured ultimate tensile strength of the assembly of prestressing tendons-anchorage, grip or coupler, in kilo-Newton (kN);
Fu - The measured damage load of the anchorage zone under the force
transmission test, in kilo-Newton (kN);
fck,o - The characteristic compressive strength to be achieved by the concrete member in the case of full preloading being allowed, in Megapascal (MPa); fcm,e - The measured mean compressive strength of the concrete cube as
cured under the same conditions as that of the anchorage zone force
transmission performance test, in Megapascal (MPa);
5 General requirements
5.1 Material
5.1.1 The materials used in the product shall comply with the design
requirements, AND have mechanical properties and chemical composition
certificate, as well as quality assurance. Materials shall be subjected to acceptance test after entering into factory, AND only those passing the test can be used.
5.1.2 Parts forging blanks shall comply with the provisions of GB/T 12361 or JB/T 5000.8.
5.1.3 The material of the bearing plate shall not be less than HT200 when the gray cast iron is used, and shall comply with the provisions of GB/T 9439; AND it shall comply with the provisions of GB/T 1348 when the spheroidal graphite cast iron is used.
5.2 Manufacturing
5.2.1 The product shall be processed in accordance with the requirements of the technical documentation. The cutting parts shall comply with the provisions of JB/T 5000.9.
5.2.2 The unattended grade of the thread shall not be lower than 7H/8g in GB/T 197. Threads with special requirements shall comply with the
requirements of technical documentation.
5.2.3 The tolerance level of the machined parts without tolerance dimension indications shall not be less than the level C in GB/T 1804.
5.2.4 Heat treatment of products shall be carried out in accordance with the technical documentation AND shall comply with the requirements of GB/T
16923 or GB/T 16924.
5.2.5 It is preferable for the surface of the parts of anchorage, grip and coupler ...

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