1. College of Civil Engineering, Chongqing University, Chongqing 400045, China 2. Key Laboratory of New Technology for Construction of Cities in Mountain Area, Chongqing University, Chongqing 400045, China
Two sets of dual anchors shear test methods (DSTMs) were proposed by considering the shortcomings of single anchor shear test method (SSTM). An auxiliary anchor was provided at the rear end of loading plate. Test results of 90 anchor bolts in six diameters show that the shear capacity obtained from SSTM is lower than that from DSTM, but all of them being larger than the theoretical values expressed in 0.6 times the shaft tensile fracture strength. As a result of tilting of loading plate toward the pull force, measured shear-displacement curves from SSTM had higher stochastic characteristics than those from DSTMs. Positive connection would be reached in the tilting-restraining system by exerting about 2.0 kN pre-tension force in auxiliary anchor, and effective control of loading plate tilting would be reached by virtue of the tensile rigidity of auxiliary anchor, greatly reducing in the scattering of shear-displacement curves from DSTM. Determined consistency exists between test results from both of the two sets of DSTMs system, indicating that the tension history of auxiliary anchor would not adversely affect its shear properties.
Xue-you QUAN,Qian HENG,Xiong-song LI,Lian-jie LIU. Shear test methods of bonded anchor bolts in concrete. Journal of ZheJiang University (Engineering Science), 2020, 54(4): 748-758.
Fig.4Specimen design drawing for anchor shear test
试件编号
锚栓试验组
注：1)括号内标注的是该双锚栓试验组对应的辅助锚栓组，且该辅助锚栓是作为试验组进行设计的.
Block-1
SIN-12
SIN-14
DUA-12 （DUA-14）1)
DUA-14
DUB-12
DUB-14
Block-2
SIN-16
SIN-18
DUA-16 （DUA-18）
DUA-18
DUB-16
DUB-18
Block-3
SIN-20
SIN-22
DUA-20 （DUA-22）
DUA-22
DUB-20
DUB-22
Tab.2Distribution of anchor test groups in concrete specimens
Fig.5Layout of anchors in Block-1
Fig.6Loading plate for single anchor test groups
Fig.7Loading plate for dual anchor test groups
Fig.8Schematic diagram of dual anchors shear test setup
Fig.9Shear failure of SIN-12
Fig.10Impact by cross beam in loading plate of auxiliary anchor DUB-14-4 for DUB-14-3
Fig.11Impact by cross beam in loading plate of auxiliary anchor bolt for DUA-14
锚栓组
锚栓编号
DUB-12
全部锚栓
DUA-14
全部锚栓
DUB-14
DUB-14-4
Tab.3Auxiliary anchors impacted by test anchor fracture
Fig.12Shear-displacement curves of M12 test groups
Fig.13Shear-displacement curves of M14 test groups
Fig.14Shear-displacement curves of M16 test groups
Fig.15Shear-displacement curves of M18 test groups
Fig.16Shear-displacement curves of M20 test groups
Fig.17Shear-displacement curves of M22 test groups
Vmax
M12
M14
M16
M18
5.31
7.81
8.47
11.29
Tab.4Measured maximum tension of auxiliary anchor kN
Fig.18Tension force of auxiliary anchor bolt
锚栓规格
Vu，s / kN
V1 / kN
V2，A / kN
V2，B / kN
V1/V2
M12
59.75
62.77
67.85
68.12
0.92
M14
95.89
98.41
106.12
106.41
0.92
M16
101.25
117.69
123.94
123.14
0.95
M18
149.06
156.14
169.49
164.92
0.93
M20
145.82
142.07
165.33
161.39
0.87
M22
171.67
155.80
202.80
201.31
0.77
Tab.5Measured average shear capacity of test groups
锚栓规格
SIN
DUA
DUB
r
σ
r
σ
r
σ
M12
0.913
3.753
0.942
2.817
0.910
3.913
M14
0.840
6.149
0.975
2.459
0.964
2.877
M16
0.894
6.156
0.977
2.736
0.959
3.798
M18
0.857
10.065
0.962
4.692
0.978
3.900
M20
0.909
7.903
0.979
3.975
0.980
4.147
M22
0.924
9.227
0.961
6.470
0.936
8.548
Tab.6Statistical characteristics of measured shear-displacement data of test groups before shear yielding
Fig.19Plastic deformation at edge of installation hole of anchor bolt in loading plate
Fig.20Stochastic mechanism of shear-displacement curves of single anchor test group
锚栓 规格
KSIN/ （kN·mm-1）
KDUA/ （kN·mm-1）
KDUB/ （kN·mm-1）
KDUB/ KDUA
KDUB/ KSIN
M12
9.788
12.682
21.098
1.66
2.16
M14
12.899
22.669
46.480
2.05
3.60
M16
16.764
38.785
38.387
0.99
2.28
M18
14.786
37.486
40.155
1.07
2.72
M20
13.288
44.774
41.911
0.94
3.15
M22
17.923
74.078
72.990
0.99
4.07
Tab.7Yield shear stiffness of test groups
Fig.21Comparison of shear yield rigidity among test groups
[1]
ROBERTS T M, HAJI-KAZEMI H Strengthening of under-reinforced concrete beams with mechanically attached steel plates[J]. International Journal of Cement Composites and Lightweight Concrete, 1989, 11 (1): 21- 27
doi: 10.1016/0262-5075(89)90032-8
[2]
AHMEDT M, OEHLERS D J, BRADFORD M A Retrofitting reinforced concrete beams by bolting steel plates to their sides. Part 1. behaviour and experiments[J]. Structural Engineering and Mechanics, 2000, 10 (3): 211- 226
doi: 10.12989/sem.2000.10.3.211
[3]
OEHLERS D J, AHMED M, NGUYENT N T, et al Retrofitting reinforced concrete beams by bolting steel plates to their sides. Part 2. transverse interaction and rigid plastic design[J]. Sturctural Engineering and Mechanics, 2000, 10 (3): 227- 243
doi: 10.12989/sem.2000.10.3.227
[4]
李英民, 韩大刚, 林文修 锚栓钢板加固法抗弯性能试验及设计方法[J]. 工程抗震与加固改造, 2006, 28 (5): 68- 71 LI Ying-ming, HAN Da-gang, LIN Wen-xiu Experiment study of flexural strengthening reinforced concrete beams by bolting steel plates and design method[J]. Earthquake Resistant Engineering and Retrofitting, 2006, 28 (5): 68- 71
doi: 10.3969/j.issn.1002-8412.2006.05.015
[5]
SU R K L, SIU W H, SMITH S T Effects of bolt-plate arrangements on steel plate strengthened reinforced concrete beams[J]. Engineering Structures, 2010, 32 (6): 1769- 1778
doi: 10.1016/j.engstruct.2010.02.028
[6]
LI L Z, LO S H, SU R K L Experimental study of moderately reinforced concrete beams strengthened with bolted-side steel plates[J]. Advances in Structural Engineering, 2013, 16 (3): 499- 516
doi: 10.1260/1369-4332.16.3.499
[7]
BARNES R A, BAGLIN P S, MAYS G C, et al External steel plate systems for the shear strengthening of reinforced concrete beams[J]. Engineering Structures, 2001, 23 (9): 1162- 1176
doi: 10.1016/S0141-0296(00)00124-3
[8]
LI L Z, CAI Z W, LU Z D, et al Shear performance of bolted side-plated reinforced concrete beams[J]. Engineering Structures, 2017, 144: 73- 87
doi: 10.1016/j.engstruct.2017.04.043
[9]
OEHLERS D J Development of design rules for retrofitting by adhesive bonding or bolting either FRP or steel plates to RC beams or slabs in bridges and buildings[J]. Composites Part A:Applied Science and Manufacturing, 2001, 32 (9): 1345- 1355
doi: 10.1016/S1359-835X(01)00089-6
[10]
全学友, 邓扬, 刘辉, 等 直接剪切型锚栓钢板加固混凝土梁的抗弯承载力试验研究[J]. 建筑结构, 2018, 48 (18): 88- 92 QUAN Xue-you, DENG Yang, LIU Hui, et al Experimental study on flexural capacity of concrete beams strengthened by direct-shear-bolted steel plate[J]. Building Structure, 2018, 48 (18): 88- 92
[11]
CHENG B, SU R K L Numerical studies of deep concrete coupling beams retrofitted with a laterally restrained steel plate[J]. Advances in Structural Engineering, 2011, 14 (5): 903- 915
doi: 10.1260/1369-4332.14.5.903
[12]
CHENG B, SU R K L, SHI C, et al Laterally restrained steel plate with stiffeners for seismic retrofitting of concrete coupling beams[J]. Advanced Steel Construction, 2016, 12 (2): 194- 210
[13]
SU R K L, ZHU Y Experimental and numerical studies of external steel plate strengthened reinforced concrete coupling beams[J]. Engineering Structures, 2005, 27 (10): 1537- 1550
doi: 10.1016/j.engstruct.2005.04.012
[14]
ZHU Y, SU R K L Behavior of strengthened reinforced concrete coupling beams by bolted steel plates, Part 2: evaluation of theoretical strength[J]. Structural Engineering and Mechanics, 2010, 34 (5): 563- 580
doi: 10.12989/sem.2010.34.5.563
[15]
ZHU Y, SU R K L, ZHOU F L Seismic behavior of strengthened reinforced concrete coupling beams by bolted steel plates, Part 1: experimental study[J]. Structural Engineering and Mechanics, 2007, 27 (2): 149- 172
doi: 10.12989/sem.2007.27.2.149
[16]
AL-SALLOUM Y A, ALRUBAIDI M A, ELSANADEDY H M, et al Strengthening of precast RC beam-column connections for progressive collapse mitigation using bolted steel plates[J]. Engineering Structures, 2018, 161: 146- 160
doi: 10.1016/j.engstruct.2018.02.009
[17]
Guideline for European technical approval of metal anchors for use in concrete: ETAG 001 [Z], 1997.
[18]
Standard test methods for strength of anchors in concrete elements: ASTM E488/E488M-15 [S]. [S.l.]: ASTM, 2015.
[19]
ELIGEHAUSEN R, MALLEE R, SILVA F. Anchorage in concrete construction [M]. [S.1.]: Ernst&Sohn, 2006.
