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JGJ 107-2016 English PDF (JGJ107-2016)

JGJ 107-2016 English PDF (JGJ107-2016)

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JGJ 107-2016: Technical specification for mechanical splicing of steel reinforcing bars

This specification is applicable to the design, construction and acceptance of rebar mechanical connection in reinforced concrete structures of construction projects.
JGJ 107-2016
INDUSTRY STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
UDC
P JGJ 107-2016
Registration No. J 986-2016
Technical specification for mechanical splicing of
steel reinforcing bars
ISSUED ON: FEBRUARY 22, 2016
IMPLEMENTED ON: AUGUST 01, 2016
Issued by: Ministry of Housing and Urban-Rural Development of PRC
Table of Contents
Foreword ... 4
1 General provisions ... 8
2 Terms and symbols ... 9
2.1 Terms ... 9
2.2 Symbols ... 10
3 Performance requirements of splices ... 11
4 Splice applications ... 13
5 Initial type testing of splices ... 15
6 Machining and installing of splices on site ... 17
6.1 General requirements ... 17
6.2 Machining of splices on site ... 17
6.3 Installing of splices on site ... 18
7 Inspecting and accepting of splices on site ... 20
Appendix A -- Test methods for splice samples ... 24
Appendix B -- Test report of initial type testing of splices ... 30
Explanation of wording in this specification ... 36
List of quoted standards ... 37
Descriptions of provisions ... 38
Technical specification for mechanical splicing of
steel reinforcing bars
1 General provisions
1.0.1 In order to standardize the application of rebar mechanical connection in reinforced concrete structural engineering, so as to be safe, applicable, advanced in technology, economical and reasonable, to ensure quality, this specification was formulated.
1.0.2 This specification is applicable to the design, construction and acceptance of rebar mechanical connection in reinforced concrete structures of construction projects.
1.0.3 The steel reinforcing bars used for mechanical connection shall comply with the current national standards ?€?Steel for the reinforcement of concrete - Part 2: Hot rolled ribbed bars?€? GB 1499.2, ?€?Quenching and self-tempering ribbed bars for the reinforcement of concrete?€? GB 13014, ?€?Stainless steel bars for the reinforcement of concrete?€? YB/T 4362, ?€?Steel for the reinforcement of concrete - Part 1: Hot rolled plain bars?€? GB 1499.1.
1.0.4 In addition to this specification, the rebar mechanical connection shall also comply with the relevant national standards.
2 Terms and symbols
2.1 Terms
2.1.1 Rebar mechanical splicing
A connection method for transmitting a force in one reinforcing bar to another reinforcing bar through mechanical occlusion of a reinforcing bar with a connecting member or other intervening material or pressure bearing effect on a reinforcing bar?€?s end face.
2.1.2 Splice
In a complete set of devices of rebar mechanical connection, a shorted name of rebar mechanical connections.
2.1.3 Connectors of mechanical splicing
It connects the various components for reinforcing steel bar, including sleeves and other components.
2.1.4 Coupler or sleeve
A steel sleeve used to transmit the axial tensile or compressive force of a reinforcing steel bar.
2.1.5 Rebar threaded sector
A threaded section at the end of a reinforcing steel bar in a splice.
2.1.6 Length of mechanical splice
The length of the splice?€?s connector plus the length of the segment of the variable cross-section of the reinforcing steel bar at both ends of the connector of mechanical splicing. The exposed threaded head and upset transition
segment of the threaded sector belong to variable cross-sectional segments. 2.1.7 Tensile strength of splice
The maximum tensile stress value of the splice sample during the tensile test. 2.1.8 Residual deformation of splice
After the splice sample is loaded and unloaded according to the specified loading system, the deformation measured within the specified gauge distance. 2.1.9 Total elongation of splice sample at maximum tensile force
4 Splice applications
4.0.1 The selection of splice grades shall meet the following requirements: 1 In the concrete structure, where the strength of the steel reinforcing bar is required to be fully exerted or where high ductility is required, it shall select the grade II or grade I splices; when the area percentage of the steel splices in the same splicing segment is 100%, it shall select grade I splice.
2 In the location of the concrete structure where the steel reinforcing bar has high stress but has low requirements for the ductility, it may select the grade III splices.
4.0.2 The thickness of the concrete protective layer of the connector of mechanical splicing should comply with the provisions of the current national standard ?€?Code for design of concrete structures?€? GB 50010, meanwhile it shall not be less than 0.75 times the minimum protective layer thickness of steel reinforcing bars and 15 mm, whichever is larger. If necessary, it may take anti- rust measures for the connector of mechanical splicing.
4.0.3 The splices of longitudinally stressed steel reinforcing bars in structural members should be staggered from each other. The length of the connecting segment of the rebar mechanical splicing shall be calculated as 35d. When the steel reinforcing bars with different diameters are connected, it should be calculated based on the steel reinforcing bar of smaller diameter. The area percentages of the rebar mechanical splicing located in the same connection segment shall meet the following requirements:
1 The splice should be set at the place where the stress of the structural member's tensile steel reinforcing bar is relatively small. When the splice is set at the high stress part, the percentage of the splice area of the grade III splice in the same connection segment shall not be greater than 25%; the area percentage of the grade II splices shall be not more than 50%. Except for the conditions as listed in item 2 and item 4 in this clause, the splice area percentage of the grade I splices may be not limited otherwise.
2 Splices should avoid the beam-end and column-end stirrup-densified areas of the frame which has seismic fortification requirements; when it cannot be avoided, it shall use the grade II splices and grade I splices. Meanwhile the splice area percentage shall be not greater than 50%.
3 The percentage of splice area can be unrestricted for areas with small tensile stress of tensioned steel reinforcing bars or longitudinally compressed steel reinforcing bars.
4 For structural members that are directly subjected to repeated loads, the 5 Initial type testing of splices
5.0.1 Type testing shall be performed in the following cases:
1 When determining the splice?€?s performance grade;
2 When the sleeve?€?s material, specifications and splice processing technology are changed;
3 When the type testing report is over 4 years.
5.0.2 Splice?€?s type testing samples shall meet the following requirements: 1 For each type, grade, specification, material, and process of rebar mechanical splicing, the number of samples for type testing shall not be less than 12; of which, the number of samples for tensile strength test of the base metal shall be not less than 3; the number of samples for unidirectional tensile test shall be not less than 3; the number of samples for high-stress repeated tension- compression shall be not less than 3; the number of samples for large-
deformation repeated tension-compression shall be not less than 3;
2 The steel reinforcing bars of all samples shall be cut from the same steel reinforcing bar;
3 The splice sample shall be installed in accordance with the requirements of clause 6.3 of this specification;
4 The samples for type testing shall not use the pre-drawn samples.
5.0.3 The type testing of the splices shall be carried out in accordance with the provisions of Appendix A of this specification. When the test results meet the following requirements, they shall be assessed as qualified:
1 Strength testing: The actual measured value of the strength of each splice sample shall meet the strength requirements of the corresponding splice grade in Table 3.0.5 of this specification;
2 Deformation testing: The average value of the measured values of the total deformation of the three samples under the residual deformation and the maximum force shall meet the requirements of Table 3.0.7 of this
specification.
5.0.4 Type testing shall record the parameters of the connectors of mechanical splicing and splices in detail. It should issue a testing report and assessment conclusion according to the format of Appendix B of this specification. 5.0.5 When the splice is used for components that are directly subjected to 6 Machining and installing of splices on site
6.1 General requirements
6.1.1 On-site processing of rebar threaded sector and installation of splices shall be performed according to the processing and installation technical requirements of the providers for splice technology. The operators shall go to work after passing the professional training. The staff shall be stable. 6.1.2 Processing of rebar threaded sector and installation of splices shall be carried out only after passing the technical testing.
6.2 Machining of splices on site
6.2.1 The processing of straight threaded rebar threaded sector shall meet the following requirements:
1 The end of the steel reinforcing bar shall be leveled by a band saw, grinding wheel saw or a special steel reinforcing bar cutting machine with a circular blade;
2 The upsetting head shall not have a transverse crack perpendicular to the axis of the steel reinforcing bar;
3 The length of the rebar threaded sector shall meet the product design requirements; the limit deviation shall be 0 ~ 2.0p;
4 The rebar threaded sector should meet the grade 6f accuracy requirements. It shall use a special straight thread gauge for inspection. The go-gauge shall be able to screw in smoothly and reach the required screw-in length. The screw-in of no-go-gauge must not exceed 3p. The number of self-tests for each specification shall not be less than 10%; the inspection pass rate shall not be less than 95%.
6.2.2 The processing of the conical threaded rebar threaded sector shall meet the following requirements:
1 There must be no local bending at the end of the steel reinforcing bar that affects thread processing;
2 The length of the rebar threaded sector shall meet the product design requirements; the rebar threaded sectors after tightening must not contact each other; the limit deviation of the processing length of the threaded sector shall be -0.5p ~ -1.5p;
7 Inspecting and accepting of splices on site
7.0.1 When splices are used in engineering, the relevant technical data of splices submitted by the splice technology provider shall be reviewed and accepted, which shall include the following:
1 The valid type testing report of splices used in the project;
2 Relevant technical documents for product design of splices, processing and installation of splices;
3 Certificate of qualification of splice products and quality certificate of raw materials for connectors of mechanical splicing.
7.0.2 The splice process testing shall be carried out for the steel reinforcing bars of different production plants. When the steel reinforcing bar plant or splice technology provider is replaced during construction, it shall make additional process testing, which shall meet the following requirements:
1 All types and models of splices shall be subject to process testing, which includes unidirectional tensile ultimate tensile strength and residual
deformation;
2 There shall be not less than 3 samples of each type of steel splices; 3 After measuring the residual deformation of the splice sample, the ultimate tensile strength test can be continued; meanwhile it should carry out the test according to the unidirectional tensile loading system in Table A.1.3 of this specification;
4 The ultimate tensile strength of each sample and the average value of the residual deformation of the 3 splice samples shall meet the requirements of Table 3.0.5 and Table 3.0.7 of this specification;
5 When the process testing fails, it shall adjust the process parameters. After passing the test, it can use the finally determined process parameters the splices can be processed in batches according to the final confirmed process parameters.
7.0.3 The rebar threaded sector?€?s processing shall be subject to self-inspection in accordance with the requirements of clause 6.2 of this specification. When the supervision or quality inspection department disagrees with the processing quality of rebar threaded sector on-site, it may randomly take 3 splice samples for the testing of the ultimate tensile strength and unidirectional tensile residual deformation. If the ultimate tensile strength of one sample or the average value of the residual deformation values of three samples is unsatisfactory, it shall 2 For the sleeve extruded splices, it shall take 10% splices according to the acceptance batch. The diameter of the indentation or the length of the sleeve after extrusion shall meet the requirements of item 3 of clause 6.3.3 of this specification; the depth of the steel reinforcing bar inserted into the sleeve shall meet the product design requirements. When the number of unqualified inspections exceeds 10%, it may take 3 samples from the unqualified splices in appearance inspection in this batch to carry out the ultimate tensile strength test; it is evaluated in accordance with clause 7.0.7 of this
specification.
7.0.7 For each acceptance batch of splices, it shall randomly cut 3 splice samples from the engineering structure for ultimate tensile strength test. It is evaluated according to the splice grade required by the design. When the ultimate tensile strength of the three splice samples meets the strength requirements of the corresponding grades in Table 3.0.5 of this specification, the acceptance batch shall be evaluated as qualified. When the ultimate tensile strength of only 1 sample does not meet the requirements, it shall take another 6 samples for re-inspection. In the re-inspection, if the ultimate tensile strength of one sample still fails to meet the requirements, the acceptance batch shall be rated as unqualified.
7.0.8 For closed ring rebar splices, rebar cage splices, buried sleeve splices for underground diaphragm walls, stainless steel rebar splices, rebar splices between prefabricated structural members, the splices with fatigue
performance requirements, it may perform witnessed sampling. From the
processed and qualified finished products of rebar threaded sectors, randomly cut rebar samples; follow the requirements of clause 6.3 of this specification, assemble them with the mobilized sleeves as randomly taken to form 3 splice samples, to carry out the ultimate tensile strength test. It is evaluated according to the splice grade as required by design. The conformity assessment of the acceptance batch shall comply with the provisions of clause 7.0.7 of this specification.
7.0.9 For the on-site inspection of the same splice type, same model, same grade, same specification, if the one-time qualification rate of the tensile strength tests of the samples from 10 consecutive acceptance batches is 100%, the number of splices in the acceptance batch can be expanded to 1000. When the number of splices in the acceptance batch is less than 200, it may randomly take 2 samples according to the sampling requirements same as those in
clause 7.0.7 or clause 7.0.8 of this specification, to perform the ultimate tensile strength test; when the ultimate tensile strength of the 2 samples meet the strength requirements of clause 3.0.5 of this specification, it shall take another 4 samples for reinspection; if there is still 1 sample fails in the ultimate tensile strength test, this acceptance batch shall be rated as unqualified.
7.0.10 For validly certified splice products, the number of acceptance batches 3 ??2 is the deformation value represented by the distance between the
intersection points of the parallel line of S and the abscissa at an unloading force of 0.5fyk As and a reverse loading force of -0.25fyk As after 4 repeated loading of 2??yk L1;
4 ??3 and ??4 are the deformation value obtained in the same way as ??1 and ??2 after 5??yk L1 is repeatedly loaded 4 times.
A.1.4 The load stress rate when measuring the residual deformation of the splice sample should be 2N/mm2??s-1, which shall not exceed 10N/mm2??s-1. When measuring the total elongation or ultimate tensile strength of the splice sample under the maximum force, the separation rate of the tester chuck should be 0.05Lc per minute, wherein Lc is distance between the chucks of the tester. The relative error of the speed should not be greater than ?? 20%.
A.1.5 The numerical rounding off and judgment of the test results shall comply with the provisions of the current national standard ?€?Rules of rounding off for numerical values and expression and judgement of limiting values?€? GB/T 8170. A.2 On-site inspection
A.2.1 The instrument layout, measurement gauge distance and loading rate of splice deformation test for residual deformation inspection during on-site process inspection shall meet the requirements of clauses A.1.1 and A.1.4 of this specification. In the field process inspection, when the residual deformation inspection of the splice is carried out according to the loading system in clause A.1.3 of this specification, it may use a tensile force of not more than 0.012Asfyk as the nominal zero load.
A.2.2 The ultimate tensile strength test of spot checked splice sample shall adopt a one-time loading system from zero to failure.
A.3 Fatigue testing
A.3.1 The splice sample used for fatigue test shall be manufactured and installed according to the relevant technical requirements of the splice technology supplier. The bending angle of the sample after assembly shall not exceed 1??; the length of the tested segment of the sample should not be less than 400 mm.
A.3.2 The fatigue performance test of splice sample should be performed by the use of a low frequency test machine; the stress cycle frequency should be selected from 5Hz to 15Hz. When a high frequency fatigue test machine is used for fatigue tests, the stress amplitude or test results should be corrected. During the test, when the temperature of the sample exceeds 40 ??C, it shall take cooling measures. When the rebar splice is used in high and low temperature environments, the splice?€?s fatigue test shall be performed under the
Table of Contents
1 General -------------------------------------------------------------------------------------- 42 2 Terms and symbols ---------------------------------------------------------------------- 43 2.1 Terms ------------------------------------------------------------------------------------------ 43 2.2 Symbols -------------------------------------------------------------------------------------- 44 3 Performance requirements of splices --------------------------------------------- 45 4 Splice applications ---------------------------------------------------------------------- 49 5 Initial type testing of splices --------------------------------------------------------- 51 6 Machining and installing of splices on site ------------------------------------- 53 6.1 General requirements ------------------------------------------------------------------- 53 6.2 Machining of splices on site ---------------------------------------------------------- 53 6.3 Installing of splices on site ------------------------------------------------------------ 54 7 Inspecting and accepting of splices on site ------------------------------------ 56 Appendix A -- Test method for splice sample...

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