Experimental Research on Longitudinal Steel Bar Bond Properties in Modified Recycled Aggregate Concrete Beam-Column Interior Joint under Cyclic Loading

Table 4

Bond stress on longitudinal steel bar crossing joint in each of the loading stages.

Specimen	Steel bar number and diameter	Loading direction	Full-section crack stage		Ultimate stage		Failure stage
			/MPa		/MPa		/MPa
ZJ-1	No. 1 D18	Positive	4.491	0.149	3.255	0.108	2.148	0.071
		Negative	8.066	0.267	8.510	0.282	5.839	0.199
	No. 2 D18	Positive	6.104	0.202	6.978	0.231	5.786	0.192
		Negative	12.387	0.410	13.029	0.431	8.232	0.273
	No. 3 D18	Positive	5.874	0.195	1.734	0.057	0.126	0.004
		Negative	7.891	0.261	8.087	0.268	5.931	0.196
	No. 4 D18	Positive	6.299	0.206	6.519	0.216	4.102	0.136
		Negative	4.719	0.156	3.980	0.132	3.872	0.128
ZJ-2	No. 1 D16	Positive	6.968	0.231	7.210	0.239	4.983	0.165
		Negative	6.932	0.230	7.220	0.239	4.532	0.150
	No. 2 D16	Positive	7.909	0.262	8.646	0.286	4.565	0.151
		Negative	8.149	0.270	9.342	0.309	6.235	0.206
	No. 3 D16	Positive	7.751	0.257	7.506	0.249	3.230	0.107
		Negative	5.208	0.172	6.010	0.199	1.342	0.044
	No. 4 D16	Positive	8.472	0.281	8.735	0.289	2.987	0.099
		Negative	6.554	0.217	4.843	0.160	3.373	0.112
ZJ-3	No. 1 D18	Positive	8.004	0.249	9.073	0.282	7.014	0.218
		Negative	3.101	0.096	1.776	0.055	0.538	0.017
	No. 2 D18	Positive	8.478	0.263	10.224	0.318	7.642	0.237
		Negative	6.206	0.193	7.345	0.228	1.029	0.032
	No. 3 D18	Positive	8.085	0.251	8.471	0.263	4.081	0.127
		Negative	7.893	0.245	7.935	0.246	2.022	0.063
	No. 4 D18	Positive	6.420	0.199	1.482	0.046	0.654	0.020
		Negative	6.759	0.210	8.934	0.277	6.800	0.211