Experimental Research on Longitudinal Steel Bar Bond Properties in Modified Recycled Aggregate Concrete Beam-Column Interior Joint under Cyclic Loading
Table 5
Statistic results of bond stress on longitudinal steel bar crossing joint in each loading stage.
Specimen
Steel diameter
Average bond strength (MPa)
Variance
Variation coefficient
Relative bond strength
ZJ1 and ZJ2
ZJ1 and ZJ3
Full crack stage
ZJ1
D18
6.979
2.372
0.340
0.231
0.963
1.085
ZJ2
D16
7.243
0.989
0.137
0.240
ZJ3
D18
6.868
1.630
0.237
0.213
Ultimate stage
ZJ1
D18
6.512
3.336
0.512
0.216
0.878
1.010
ZJ2
D16
7.439
1.398
0.188
0.246
ZJ3
D18
6.905
3.148
0.456
0.214
Failure stage
ZJ1
D18
4.505
2.362
0.524
0.150
1.162
1.293
ZJ2
D16
3.906
1.395
0.357
0.129
ZJ3
D18
3.723
2.861
0.769
0.116
is for the mineral fly ash modified RAC and is for the ordinary RAC. is for the steel diameter 18 mm and is for the steel diameter 16 mm.
