Research on In Situ Stress Measurements in Reinforced Concrete Beams Based on the Core-Drilling Method

Table 4

Experimental measurements collected from the second beam.

Drilling depth (mm)	50 mm diameter front borehole (front 2-1)		Drilling depth (mm)	50 mm diameter side borehole (side 2-1)	Drilling depth (mm)	50 mm diameter side borehole (side 2-2)
	20AA strain (με)	10AA strain (με)		10AA strain (με)		20AA strain (με)
0	−70	−78	0	−37	0	−41
5	−57	−62	5	−28	8	−40
10	−31	−29	11	−13	15	−21
15	−12	−15	17	−6	21	−6
19	−8	−9	23	−1	27	−3
25	−1	−5	30	0	31	2
31	−1	3	36	0	40	2
35	2	3	40	0
40	1	1