JGJ 85-1992 Technical specification for application of anchors, clamps and connectors for prestressed tendons JGJ85-92
Some standard content:
Engineering Construction Standard Full-text Information System
Industry Standard of the People's Republic of China
Technical Specification for Application of Anchors, Clamps and Connectors for Prestressed Reinforcement
1992 Beijing
Engineering Construction Standard Full-text Information System
. Engineering Construction Standard Full-text Information System
Industry Standard of the People's Republic of China
Technical Specification for Application of Anchors, Clamps and Connectors for Prestressed Reinforcement
IGI8592
Editor: China Academy of Building ResearchApproval Department: Ministry of Construction of the People's Republic of ChinaEffective Date: May 1, 1993
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Notice on the Release of the Industry Standard "Technical Specification for the Application of Anchors, Clamps and Connectors for Prestressed Reinforcements" Construction Standard [No. 19927643]
Construction Committees (Construction Departments) of all provinces, autonomous regions, and municipalities directly under the Central Government, Construction Committees of cities with independent planning status, and relevant departments of the State Council:
According to the requirements of the former Ministry of Urban and Rural Construction and Environmental Protection (83) Chengkezi No. 224, the "Technical Specification for the Application of Anchors, Clamps and Connectors for Prestressed Reinforcements" compiled by the China Academy of Building Research has been reviewed and approved as an industry standard, with the number JGJ85-92, and will be implemented from May 1, 1993. The China Academy of Building Research, the technical unit for construction engineering standards of the Ministry of Construction, is responsible for the management of this standard, and the China Academy of Building Research is responsible for its interpretation. The Ministry of Construction's Standards and Norms Research Institute organizes its publication.
Ministry of Construction of the People's Republic of China
September 23, 1992
Engineering Construction Standards Full-text Information System
Engineering Construction Standards Full-text Information System
Measured ultimate tensile force Fepu of prestressed pin assembly
The sum of the calculated ultimate tensile force of each prestressed steel in the prestressed tendon anchor assembly;
Measured ultimate tensile force of prestressed tendon clamp assembly; The sum of the calculated ultimate tensile force of each prestressed steel in the prestressed tendon clamp assembly,
The total strain of the prestressed tendon anchor assembly when the measured ultimate tensile force is reached;
The total cross-sectional area of each prestressed steel in the prestressed tendon anchor and clamp assembly;
The average yield strength of the specimens extracted from the prestressed steel at a residual strain of 0.2%, the average ultimate tensile strength of the specimens extracted from the prestressed steel Mean value;
the average strain value of the specimens extracted from the prestressed steel when the stress reaches the yield strength;
the average ultimate strain value of the specimens extracted from the prestressed steel when the stress reaches the ultimate tensile strength; the cross-sectional area and average value of the specimens extracted from the prestressed steel - the average yield strength ratio of the specimens extracted from the prestressed steel; S - the standard deviation of the ultimate strain of the specimens extracted from the prestressed steel;
the coefficient of variation of the ultimate strain of the specimens extracted from the prestressed steel;
Engineering Construction Standard Full-text Information System
bzsoso.cmEngineering Construction Standard Full-text Information System
-the anchor efficiency coefficient measured by the static load test of the prestressed tendon anchor assembly;
-the clamp efficiency coefficient measured by the static load test of the prestressed tendon clamp assemblyngbzxZ.net
-the efficiency coefficient of the prestressed tendon.
Engineering Construction Standard Full-text Information System
.Engineering Construction Standard Full-text Information System
Chapter 4
Chapter 5
Chapter 6
Performance requirements
000950550500000000000000000060095505000090000000000000000Selection of anchors, clamps and connectors
On-site acceptance
Static load anchoring performance test
Usage requirements
Terminology explanation
Prestressed Calculation of efficiency coefficient of reinforcement
Explanation of terms used in this code.
Additional explanation
Engineering Construction Standard Full Text Information System
+6066000666666
.........+++.+..............17
bzsoso,cmEngineering Construction Standard Full Text Information System
Chapter 1 General
Article 1.0.1 This code is formulated in order to correctly design and reasonably apply prestressed screens, fixtures and connectors in prestressed concrete structure engineering and unify their technical requirements.
Article 1.0.2 This code applies to anchors, clamps and connectors for prestressed cut reinforcement used in prestressed concrete structure engineering. For projects with special requirements, relevant special regulations should be observed.
Article 1.0.3 In addition to complying with the requirements of this code, anchors, clamps and connectors for prestressed tendons in prestressed concrete structural engineering shall also comply with the current standards "Concrete Structure Engineering Construction and Acceptance Code", "Anchors, Clamps and Connectors for Prestressed Reinforcements" and other relevant standards. Engineering Construction Standards Full-text Information System
Engineering Construction Standards Full-text Information System
Chapter 2 Performance Requirements
Article 2.0.1 The performance of anchors, clamps and connectors for prestressed tendons shall comply with the provisions of the current national standard "Anchors, Clamps and Connectors for Prestressed Reinforcements". Article 2.0.2 The static load anchoring performance of the anchor shall be determined by the staggered anchor efficiency coefficient measured by the static load test of the prestressed anchor assembly and the total strain epu when the measured ultimate tensile force is reached. The efficiency coefficient n of the stud should be calculated according to the following formula: ma
npFapu
the measured ultimate tensile force of the prestressed tendon anchor assembly; Fapu
the sum of the calculated ultimate tensile forces of each prestressed steel in the prestressed tendon stud assembly,
%——the efficiency coefficient of the prestressed tendon.
Article 2.0.3 Under the condition that the strength grade of prestressed tendons has been determined, the static load anchoring performance of anchors shall meet the following requirements at the same time: Class I anchors
Class II anchors
eapu≥2.0%
eapu≥1.7%
Article 2.0.4 The efficiency coefficient % of prestressed tendons shall be taken in accordance with the following provisions: 1. For anchors used in important prestressed concrete structural projects, their on-site acceptance shall be calculated in accordance with Appendix 2 of this code; 2. For anchors used in general prestressed concrete structural projects, their on-site acceptance, when the prestressed tendons are steel wires, steel strands or heat-treated steel bars, % shall be taken as Engineering Construction Standard Full-text Information System
bzsoso.cm Engineering Construction Standard Full-text Information System
0.97; when the prestressed tendons are cold-drawn Grade Ⅱ, Ⅲ, and IV steel bars, % shall be taken as 1.00. Article 2.0.5 The sum of the calculated ultimate tensile forces Fpu of each prestressed steel in the prestressed tendon anchor assembly shall be calculated as follows: Fpu = fpmAp
(2. 0. 5)
The average ultimate tensile strength of the specimens extracted from the prestressed steel;
The total cross-sectional area of each prestressed steel in the prestressed tendon anchor assembly.
Article 2.0.6 In addition to meeting the static load anchoring performance, the prestressed tendon anchor assembly of Class I anchors must also meet the fatigue performance test with a cycle number of 2 million times. In earthquake-resistant structures, they must also meet the low-cycle repeated load test with a cycle number of 50 times.
Class I anchors only need to meet the requirements of static load anchoring performance. Article 2.0.7 The anchor shall also comply with the following provisions: 1. When the prestressed tendon anchor assembly reaches the measured ultimate tension Fapu, except for those allowed by the anchor design, all parts shall not have visible cracks or damage,
, shall meet the requirements of the tensioning process such as Fen-level tensioning and supplementary tensioning, and shall have the ability to relax the prestressed tendons;
3. Grouting holes shall be set on the anchor or its accessories, and the grouting holes shall have sufficient cross-sectional area to ensure the smooth flow of slurry; 4. The shrinkage of the prestressed arrow during paving shall comply with the provisions of the current national standard "Concrete Structure Engineering Construction and Acceptance Code". Article 2.0.8 The static load anchoring performance of the clamp shall be determined by the clamp efficiency coefficient % measured by the static load test of the prestressed tendon clamp assembly. The efficiency coefficient of the fixture is calculated as follows:
npFgpu
wherein Fspu is the measured ultimate tensile force of the prestressed tendon fixture assembly; Engineering Construction Standard Full Text Information System
(2. 0. 8)
bzSos, COm Engineering Construction Standard Full Text Information System
Fopu is the sum of the calculated ultimate tensile forces of each prestressed steel in the prestressed tendon fixture assembly;
m is the efficiency coefficient of the prestressed tendon, which shall be adopted in accordance with the provisions of the second paragraph of Article 2.0.4 of this Code.
Article 2.0.9 The static load anchoring performance of the fixture shall meet the following requirements: ng>0.95
Article 2.0.10 The clamp shall also have the following properties: 1. When the prestressed tendon clamp assembly reaches the actual ultimate tensile force, all parts shall not have visible cracks and damage; 2. Have good self-anchoring performance; 3. Have good loosening performance; 4. Can be reused many times.
Note: Clamps that require strong knocking to loosen can only be used when it is proven that they have no effect on the anchorage of the prestressed tendons and do not pose a danger to the safety of operators. Article 2.0.11 Prestressed tendon connectors used in the post-tensioning method must meet the anchorage performance requirements of T-type anchors; prestressed tendon connectors used in the pre-tensioning method must meet the anchorage performance requirements of the clamp.
Engineering Construction Standard Full Text Information System
.Engineering Construction Standard Full Text Information System
Chapter 3 Selection of Anchors, Clamps and Connectors Article 3.0.1 Anchors, clamps and connectors for prestressed tendons can be divided into four types according to different fixing methods: sheet type (multi-hole sheet anchors, IM paving, etc.), support type (sensitive head anchors, screw end rod anchors, etc.), cone plug type (steel cone anchors, groove pin anchors, etc.) and grip type (embossed anchors, extruded anchors, etc.). Article 3.0.2 The model of anchors, clamps and connectors is represented by two Chinese phonetic letters. The first letter is the prestressed system code, which is selected by the research and development unit. If there is no research and development unit, it can be omitted; the first letter is the anchor, clamp or connector code, see Table 3.0.2-1.
Connector
For anchorage codes of anchors, clamps and connectors, see Table 3.0.2-2Table 3.0.2-2
Anchorage method
Clip type
Article 3.0.3
Support type
Cone plug type
Grip type
The marking of prestressed anchors, clamps and connectors consists of four parts: model, prestressed steel diameter, number of prestressed steel roots and anchorage code:
Work Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Prestressed
Anchor, Clamp
Or Long Tool
Prestressed
Prestressed Material Diameter (mm)
Prestressed
Anchoring Method
Odd Method
For example: The head anchor for anchoring 21 steel wires with a diameter of 5mm for prestressed concrete is marked as M5-21D.
Article 3.0.4 The selection of anchors shall be determined by the engineering design unit according to the requirements of Table 3.0.4 based on the different types of prestressed tendons and anchoring locations. Selection of anchors
Types of prestressed tendons
Steel strands and strand bundles
High-strength steel wire
High-strength steel wire bundles
Hot-rolled cold-drawn steel bar bundles with a diameter of 2mm
Hot-rolled cold-drawn steel bars with a diameter of ≥18mm
Finely rolled threaded steel bars
Tensile end
Clip anchors
Stitching tools
Forged anchors
Clip staggered anchors
Forged anchors
Cone plug anchors
Clip anchors
Selection of staggering tools and staggering locations
Non-tensioning end||tt| |Clip anchor
Clip staggered fixture
Upset anchor
Clip anchor
Forged anchor
Cone plug anchor
Clip anchor
Screw end rod anchor
Screw end rod anchor
Bonding end
Embossed pot fixture
Extruded anchor
Forged fixture
Extruded anchor
Upset anchor
Aotou anchor
Article 3.0.5, the type of anchor shall be selected by the engineering design unit according to the following provisions based on the anchoring performance of the anchor and the stress conditions of the structure. For prestressed concrete structures subjected to dynamic and static loads, Class 1 anchor shall be selected,
Engineering Construction Standard Full Text Information System
m
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.