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JGJ 85-2010

Chinese Standard: 'JGJ 85-2010'
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Detail Information of JGJ 85-2010; JGJ85-2010
Description (Translated English): Technical specification for application of anchorage, grip and coupler for prestressing tendons
Sector / Industry: Building & Construction Industry Standard
Classification of Chinese Standard: P25
Classification of International Standard: 91.080.40
Word Count Estimation: 70,745
Date of Issue: 2010-04-17
Date of Implementation: 2010-10-01
Older Standard (superseded by this standard): JGJ 85-2002
Quoted Standard: GB 3836.1-2000; GB 3836.2-2000; GB 3836.3-2000; GB/T 17288-2009; GB/T 17612-1998; JJF 1001-1998; JJF 1004-2004; JB/T 9242-1999; JB/T 10564 -2006; OIML R120-1996
Drafting Organization: China Academy of Building Research
Administrative Organization: ?Ministry of Housing and Urban-Rural Development
Regulation (derived from): Bulletin of the Ministry of Housing and Urban No. 549
Summary: This standard applies to prestressed concrete structures, building prestressing steel, rock anchors and anchor tendons and other projects in the anchorage, clamp and connector applications.

UDC
Record No.. J 1006-2010
PROFESSIONAL STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
Technical Specification for Application of
Anchorage, Grip and Coupler for
Prestressing Tendons
预应力筋用锚具, 夹具和连接器应用技术规程
Issue on April 17, 2010 Implemented on October 1, 2010
Issued by. Ministry of Housing and Urban-Rural Development of the
People's Republic of China
JGJ
Table of Contents
1 General Provisions ... 1 
2 Terms and Symbols ... 2 
2.1 Terms ... 2 
2.2 Symbols ... 3 
3 Performance Requirements ... 5 
4 Design Selection ... 8 
5 Site Acceptance ... 11 
6 Operating Requirements ... 14 
Appendix A Test Methods and Inspection Requirements of Anchorage Zone Load Transfer
... 16 
Appendix B Test Methods and Inspection Requirements of Static Load Anchoring
Performance ... 20 
Appendix C Test Methods for Anchorage Draw-in Value ... 23 
Appendix D Test Method of Prestress Loss Due to Friction at Anchorage Device ... 25 
Appendix E Test Methods and Inspection Requirements of Anchor Plate Performance ... 27 
Appendix F Test Methods and Inspection Requirements of Low-Temperature Anchoring
Performance Test for Anchorage ... 29 
Appendix G Test Method of Prestress Loss Due to Friction at Deviated Device ... 32 
Explanation of Wording in this Specification ... 33 
List of Quoted Standards ... 34 

1 General Provisions
1.0.1 This specification is formulated with a view to reasonably applying the anchorage,
grip and coupler for prestressing tendons in the prestressed structure engineering, ensuring the
safety and reliability of anchorage zone and anchorage joint, and ensuring quality.
1.0.2 This specification is applicable to the application of anchorage, grip and coupler for
prestressing tendons in such engineering as prestressed concrete structure, building
prestressed steel structure, rock anchor and ground anchor.
1.0.3 Application of anchorage, grip and coupler in the prestressed structure engineering
shall not only meet the requirements of this specification, but also comply with those in the
current relevant ones of the nation.

2 Terms and Symbols
2.1 Terms
2.1.1 Anchorage
It refers to the permanent anchor device used to maintain the tensile force of prestressing
tendon and transfer it to the structure in the post-tensioning structural member.
2.1.2 Grip
In the production process of pre-tensioning prestressed concrete member, it refers to the
instrumental anchor device used to maintain the tensile force of prestressing tendon and fix it
on the production pedestal (or equipment); in the prestressing tendon tensioning process of
post-tensioning structure or member, it refers to the instrumental anchor device used to clamp
the prestressing tendon on the tensioning jack or equipment.
2.1.3 Coupler
It refers to the device used to connect the prestressing tendon.
2.1.4 Prestressing tendon
It is the general term of single or bundled steel wire, steel strand or prestressed twisted
reinforcement (referring to fine rolling twisted reinforcement) used to establish prestress in
the prestress works.
2.1.5 Prestressing tendon-anchorage (grip) assembly
It refers to the load carrying unit assembled with prestressing tendon and anchorage (grip)
at the end, hereinafter referred to as anchorage (grip) assembly.
2.1.6 Prestressing tendon-coupler assembly
It refers to the load carrying unit assembled with prestressing tendon and coupler,
hereinafter referred to as coupler assembly.
2.1.7 Ultimate tensile force of tendon-anchorage (grip, coupler) assembly
It refers to the maximum tensile force reached by the tendon-anchorage (grip, coupler)
assembly in the process of static load anchoring performance test.
2.1.8 Efficiency factor of prestressing tendon
It refers to the factor subject to such factors as influence of number, test device and
initial stress adjustment of prestressing tendon, in consideration of the uneven tensile stress of
prestressing tendon.
2.1.9 Draw-in
It refers to the retraction phenomenon of prestressing tendon due to the relative
displacement between parts of anchorage or between anchorage and prestressing tendon in the
anchoring process of prestressing tendon. Draw-in includes anchorage deformation, clip
displacement and prestressing tendon retraction.
2.1.10 Bearing plate
It refers to the component used to bear the pre-applied force transferred by the anchorage
and transfer it to the concrete in the post-tensioning prestressed concrete structural member.
Bearing plate may be divided into ordinary bearing plate and casting bearing plate.

ᇞb——Relative displacement between parts of anchorage (or grip and coupler);
ᇞl——Theoretical elongation value of prestressing tendon between working anchorage
at the tensioning end and jack tool anchorage under the tensioning control force;
εapu——Total strain of prestressing tendon where the prestressing tendon-anchorage
assembly reaches the ultimate tensile force;
ηn——Efficiency factor of anchorage determined in the static load anchoring
performance test of prestressing tendon-anchorage assembly;
ηg——Efficiency factor of grip determined in the static load anchoring performance test
of prestressing tendon-grip assembly;
ηp——Efficiency factor of prestressing tendon.

3 Performance Requirements
3.0.1 Basic performance of the anchorage, grip and coupler for prestressing tendons shall
meet the requirements of the current national standard "Anchorage, Grip and Coupler for
Prestressing Tendons" GB/T 14370.
3.0.2 The static load anchoring performance of anchorage shall be determined
according to the efficiency factor (ηa) of anchorage measured through the static load test
of prestressing tendon-anchorage assembly and the total strain (εapu) of the prestressing
tendon in the assembly when reaching the ultimate tensile force. Efficiency factor (ηa) of
anchorage shall not be less than 0.95; total strain (εapu) of prestressing tendon shall not
be less than 2.0%. Efficiency factor of anchorage shall be determined according to the
test results and calculated according to the following formula.
pmp
apu
a F
 
(3.0.2)
Where, ηa——Efficiency factor of anchorage determined in the static load test of
prestressing tendon-anchorage assembly;
Fapu——Ultimate tensile force of prestressing tendon-anchorage assembly (N);
Fpm——Average ultimate tensile force of prestressing tendon(N), calculated and
determined by breaking force mean of prestressing tendon specimen;
ηp——Efficiency factor of prestressing tendon, which shall be taken according to
the following requirements. if prestressing tendon in the prestressing tendon-anchorage
assembly is 1~5, ηp=1. 6~12, ηp=0.99; 13~19, ηp=0.98; 20 and above, ηp=0.97.
Failure mode of prestressing tendon-anchorage assembly shall be prestressing
tendon fracture, and anchorage parts shall not be fractured. Clip of clip-type anchorage
shall not appear fissure if the tensile stress of prestressing tendon does not exceed 0.8fptk.
3.0.3 Where prestressing tendon - anchorage (or coupler) assembly is damaged, clip of
clip-type anchorage may appear fine fissure or one longitudinal fissure.
3.0.4 Anchor plate of clip-type anchorage shall be possessed of sufficient rigidity and
bearing capacity, and the performance of anchor plate shall be determined by the load test of
anchor plate. Where the anchor plate is loaded to 0.95 Fptk and then unloaded, measured
central residual deflection of anchor plate shall not be greater than 1/600 of the upper opening
diameter of correspon......
Related standard:   JGJ 92-2016  JGJ 95-2011
   
 
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