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

Table 5

Experimental measurements collected from the third beam.

Drilling depth (mm)	100 mm diameter front borehole (front 3-1)
	20AA strain (με)	50AA strain (με)
0	−70	−76
6	−64	−71
11	−49	−53
15	−44	−46
20	−35	−40
27	−31	−28
32	−13	−18
36	−10	−14
42	−8	−8
47	−3	−5
52	5	0
56	7	4
62	4	4
70	5	3