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According to the requirements of YUEJIANKEHAN [2001] No.389 of the Department of Construction of Guangdong Province and the engineering practice characteristics of Guangdong Province, the Specification is compiled on the basis of extensive consultation of opinions and reference to the domestic and foreign scientific research achievements on the testing of tension and shear behavior of post-installed fastenings used in concrete.
The main contents of the Specification include the testing conditions, instruments and equipment, testing methods, data analysis and assessment, testing reports, institutions and personnel of tension and shear behavior of post-installed fastenings used in concrete.
Guangzhou Institute of Building Science is in charge of the explanation of the Specification. In the process of implementation, if any modification or supplement is found, please send your comments and relevant materials to Guangzhou Institute of Building Science in time (mailing address: 8th Floor, No.4 Guangwei Road, Guangzhou, postal code: 510030).
Contents
1 General principles 1
2 Terms and symbols 1
2.1 Terms 1
2.2 Symbols 4
3 Basic requirements 6
3.1 General requirements 6
3.2 Testing conditions 6
3.3 On-site testing 7
3.4 Expanded testing 9
4 Instruments and equipment 10
4.1 General requirements 10
4.2 Test devices 11
5 Test methods 14
5.1 Loading method and displacement measurement 14
5.2 Conditions of terminating loading 15
5.3 Failure modes 15
6 Analysis and assessment of test data 17
6.1 Data analysis 17
6.2 Results assessment 20
7 Testing reports, institutions and personnel 21
7.1 Testing report 21
7.2 Testing institutions and testing personnel 22
Annex A Data normalization processing method 23
Annex B Project overview table 24
Annex C Description of the words and expressions of the Specification 25
Technical specification for testing of tension and shear behavior of post-installed fastenings used in concrete
1 General principles
1.0.1 The Specification is formulated in order to unify the testing methods of tension and shear behavior of post-installed fastenings used in concrete in Guangdong Province, achieve the goal of advanced technology, accurate data and reliable assessment, and ensure the engineering quality of post-installed fastenings used in concrete.
1.0.2 The Specification is applicable to the testing of tension and shear behavior of post-installed fastenings used in concrete by static test method. The post-installed fastenings used in concrete include mechanical anchors, bonded anchors, reinforced bar and bonded belt rods.
1.0.3 The Specification stipulates the testing conditions, instruments and equipment, testing methods, data analysis and assessment, testing reports, institutions and personnel of tension and shear behavior of post-installed fastenings used in concrete.
1.0.4 The testing of tension and shear behavior of post-installed fastenings used in concrete shall comply with the Specification and the current relevant standards, codes and specifications of the state and Guangdong province at the same time.
2 Terms and symbols
2.1 Terms
2.1.1
post-installed fastenings
anchorage components installed by drilling holes on hardened concrete according to the specified process
2.1.2
base
base used to install the post-installed fastenings and bear the load transmitted by the post-installed fastenings. It refers to concrete members in the Specification
2.1.3
anchors
anchors assembly for anchoring a fastener to a concrete base
2.1.4
mechanical anchors
anchors anchored by the mechanical action between anchors and the drilling hole wall on the base, which can be divided into expansion anchors and undercut anchors
2.1.5
expansion anchors
anchors generating the anchoring effect by squeezing the anchorage hole wall with expansion pieces
2.1.6
undercut anchors
anchors generating the anchoring effect by the locking keys between the undercuts at the bottom of anchor holes and the anchor expansion pieces
2.1.7
bonded anchors
anchors generating the anchoring effect by curing the binder in the anchor hole
2.1.8
reinforced bar
steel bar generating the anchoring effect by curing the anchor adhesive in the anchor hole
2.1.9
bonded belt rods
rods generating the anchoring effect by curing the anchor adhesive in the anchor hole
2.1.10
anchor plate
steel plate directly connected with anchors and transmitting force to base
2.1.11
single anchor
anchors working independently
2.1.12
anchor group
multiple anchors working together
2.1.13
tension test
test of applying an axial tension load along the axis of the post-installed fastenings
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2.1.14
shear test
test of applying a load perpendicular to the axis of the post-installed fastenings
2.1.15
steel failure
steel of the post-installed fastenings is broken, sheared or subjected to compound stress
2.1.16
pull-out failure
failure mode that the post-installed fastenings integrally slip to the surface of the base, and are finally pulled out (which can cause locally concrete failure) under the action of tensile force
2.1.17
pull-through failure
failure mode that the expansion cone of anchor is pulled out from the expansion sleeve, while the expansion tube remains in the anchor hole under the action of tensile force
2.1.18
concrete cone failure
failure mode that the base of anchorage zone is in the form of inverted cone with anchor as the center under the action of tensile force
2.1.19
concrete splitting failure
failure mode that cracks form in the base through the axis of the post-installed fastenings or the connecting line along the axis of post-installed fastenings
2.1.20
concrete pryout failure
failure mode that the base is damaged by the lever of the post-installed fastenings when the post-installed fastenings bear the shear force
2.1.21
concrete cuneiform failure
cuneiform failure mode of the base when the post-installed fastenings bear the shear force
2.1.22
concrete edge failure
cuneiform failure mode of the base, with the anchor axis as the apex, when the post-installed fastenings bear the shear force
2.1.23
interface failure
failure mode of the interface between base and binder or anchor adhesive or the interface between steel and binder or anchor adhesive under the action of tensile force
2.2 Symbols
2.2.1 Effect and resistance
F——test load;
Fmax——maximum test load;
R——bearing capacity;
N——axial force;
V——shear force;
RRd——design value of bearing capacity;
RRk——standard value of bearing capacity;
NRd——design value of tensile bearing capacity;
VRd——design value of shear bearing capacity;
NRk——standard value of tensile bearing capacity;
VRk——standard value of shear bearing capacity;
Ru,m——average value of ultimate bearing capacity;
Ru,i——ultimate bearing capacity of the ith sample.
2.2.2 Material strength
fyk——standard value of threaded rod or reinforcement strength;
fstk——ultimate tensile strength of threaded rod or reinforcement;
fcu——compressive strength of concrete cube;
fcu,t——actually-measured compressive strength of concrete.
2.2.3 Geometric characteristic value
As——cross-sectional area of threaded rod or reinforcement;
dnom——diameter of threaded rod or reinforcement;
d0—— drilling diameter;
hef——effective anchorage depth;
hb——base thickness;
c1——criticality edge distance of base edge failure when the post-installed fastenings are under the action of shear force;
smin——the minimum distance from the fulcrum of the loading frame to the axis of the post-installed fastenings.
2.2.4 Partial coefficient and calculation coefficient
γu ——anchorage importance coefficient;
γR——partial coefficient of bearing capacity;
γ3——correction coefficient considering sample deviation;
δ——variation coefficient;
S——standard deviation of test sample;
n——tested quantity;
k——probability statistics coefficient.
2.2.5 Displacement and deformation
△——displacement of post-installed fastenings;
△vi——vertical displacement of tension test of anchor or reinforced bar under grade i test load;
△hi——horizontal displacement of anchor bolt shear test under grade i test load;
α1i, α2i——read value of No.1 and No.2 displacement sensors or dial indicators under grade i test load;
α10, α20——initial read value of No.1 and No.2 displacement sensors or dial indicators at the beginning of the test.
3 Basic requirements
3.1 General requirements
3.1.1 In the project of post-installed fastenings used in concrete, it is necessary to carry out on-site sampling testing for the tension and shear behavior of post-installed fastenings used in concrete in order to determine the tension and shear behavior of the post-installed fastenings under the ultimate state of bearing capacity and ultimate state of normal use, and ensure the construction quality of the post-installed fastenings used in concrete and the safe use of related buildings.
3.1.2 The safety grade of anchorage connection shall meet the following requirements:
According to the severity of the anchorage-connection damage, the connection by post-installed fastenings is divided into two safety grades. The design of connection by post-installed fastenings shall adopt the corresponding safety grade according to the requirements in Table 3.1.2, but it shall not be lower than the safety grade of the connected members.
1 General principles
2 Terms and symbols
2.1 Terms
2.2 Symbols
3 Basic requirements
3.1 General requirements
3.2 Testing conditions
3.3 On-site testing
4 Instruments and equipment
4.1 General requirements
4.2 Test devices
5 Test method
5.2 Conditions of terminating loading
5.3 Failure modes
6 Analysis and evaluation of test data
6.1 Data analysis
6.2 Results evaluation
7 Testing reports, institutions and personnel
7.1 Testing report
7.2 Testing institutions and testing personnel
Appendix A data normalization processing method
Appendix B project overview table
Appendix C description of the words and expressions of the Specification
