Table 1 Summary of specimen parameters and load‒displacement characteristics.

From: Investigation of the shear performance of multi-key block bonding surfaces without connecting reinforcement for precast elements

Specimen

Type of BS

Confining

Stress (MPa)

Actual class

Compressive strength of BS (MPa)

Vcr (kN)

Dcr (mm)

Vexp (kN)

Dexp (mm)

Vcr/Vexp

Dexp/Dcr

M1-B-40

M1

0.5

C40

40.3

178

0.35

185.5

0.45

0.96

1.29

M1-C-50

M1

1

C50

47.9

259

0.4

259

0.4

1

1

M1-D-50

M1

1.5

C50

47.2

300

0.45

380

0.6

0.79

1.33

M2-30

M2

0

C30

29.3

135.7

0.15

135.7

0.15

1

1

M2-A-40I

M2

0.25

C40

40.3

188.5

0.49

188.5

0.49

1

1

M2-B-40

M2

0.5

C40

40.3

220.4

0.95

220.4

0.95

1

1

M2-B-50

M2

0.5

C50

47.2

232.5

0.2

232.5

0.2

1

1

M2-C-30

M2

1

C30

31.5

309

0.9

309

0.9

1

1

M2-C-50

M2

1

C50

47.2

342.1

0.72

342.1

0.72

1

1

M2-D-20I

M2

1.5

C20

24.1

339.7

1.7

339.7

1.7

1

1

M2-D-40

M2

1.5

C40

37.1

361.1

1.2

361.1

1.2

1

1

M2-D-50

M2

1.5

C50

47.2

388.1

0.84

388.1

0.84

1

1

M2a-B-40

M2

0.5

C40

40.3

200

0.45

219.3

0.5

0.91

1.11

M2b-B-40

M2

0.5

C40

40.3

180

0.2

204.6

0.25

0.88

1.25

M2c-B-40

M2

0.5

C40

40.3

178

0.4

202.4

0.5

0.88

1.25

M2a-C-50

M2

1

C50

47.9

260

0.35

285.8

0.45

0.91

1.29

M2b-C-50

M2

1

C50

47.9

240

0.35

296.1

0.45

0.81

1.29

M2c-C-50

M2

1

C50

47.9

260

0.18

282.5

0.25

0.92

1.39

M2a-D-50

M2

1.5

C50

47.2

300

0.7

378

0.9

0.79

1.29

M2b-D-50

M2

1.5

C50

47.2

340

0.35

373.3

0.5

0.91

1.43

M2c-D-50

M2

1.5

C50

47.2

280

0.35

365

0.6

0.77

1.71

M3-30

M3

0

C30

32.4

198

0.4

198

0.4

1

1

M3-B-20I

M3

0.5

C20

24.1

178.8

0.6

178.8

0.6

1

1

M3-B-50

M3

0.5

C50

47.2

200

0.5

253.7

0.65

0.79

1.3

M3-C-30

M3

1

C30

33.7

320

0.95

348.4

1.05

0.92

1.11

M3-D-40

M3

1.5

C40

37.1

360

0.7

378.5

0.9

0.95

1.29

W-30

W

0

C30

32.4

180.1

0.3

180.1

0.3

1

1

W-A-40I

W

0.25

C40

40.3

243.5

0.575

243.5

0.575

1

1

W-B-50

W

0.5

C50

47.2

240.5

0.4

240.5

0.4

1

1

W-C-30

W

1

C30

31.5

321.4

1.1

321.4

1.1

1

1

W-C-50

W

1

C50

47.9

410

0.6

410

0.6

1

1

W-D-20I

W

1.5

C20

24.1

379.8

1.2

379.8

1.2

1

1

PSP-30

PSP

0

C30

32.4

70.8

0.1

70.8

0.1

1

1

PSP-B-50

PSP

0.5

C50

47.9

140

0.15

140

0.15

1

1

PSP-C-50

PSP

1

C50

47.9

200

0.4

228.2

0.45

0.88

1.13

PSP-D-20I

PSP

1.5

C20

24.1

240

0.39

240

0.39

1

1

CJ-30

CJ

0

C30

32.4

120

0.2

122

0.21

0.98

1.05

CJ-A-40I

CJ

0.25

C40

40.3

141.2

0.07

141.2

0.07

1

1

CJ-B-30

CJ

0.5

C30

33.7

149.9

0.3

149.9

0.3

1

1

CJ-B-50

CJ

0.5

C50

47.2

201.1

0.2

201.1

0.2

1

1

CJ-C-50

CJ

1

C50

47.9

220

0.2

239.5

0.25

0.92

1.25

CJ-D-20I

CJ

1.5

C20

24.1

248

0.8

248

0.8

1

1

CJ-D-40

CJ

1.5

C40

37.1

300

0.9

300

0.9

1

1

T-60

T

0

C60

65.1

105

0.09

105

0.09

1

1

T-B-60

T

0.5

C60

65.1

186.6

0.3

186.6

0.3

1

1

T-C-60

T

1

C60

65.1

321.7

0.56

321.7

0.56

1

1

T-D-60

T

1.5

C60

65.1

418

0.62

418

0.62

1

1

MC-B-50

MC

0.5

C50

49.9

319.6

1.51

319.6

1.51

1

1

  1. M = mold key block, W = water-jet, PSP = as-cast by patterned steel plate form, CJ = chipping with jackhammers, T = triangular groove, MC = monolithic cast-in-place; a, b and c represent defect rates of 20%, 50% and 70%, respectively, for BS key blocks, I = using DIC technology; A = 0.25 MPa, B = 0.5 MPa, C = 1 MPa, D = 1.5 MPa; 20, 30, 40, 50 and 60 represent the actual class of concrete; Vcr and Vexp are the cracking load and experiment shear capacity of the specimen, respectively; Dcr and Dexp are the displacements corresponding to Vcr and Vexp, respectively.
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