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

Table 3

Experimental measurements collected from the first beam.

Drilling depth (mm)	75 mm diameter front borehole (front 1-2)
	30AA strain (με)	20AA strain (με)	10AA strain (με)
0	−66	−68	−49
7	−53	−59	−42
12	−39	−53	−1
17	−33	−40	0
22	−23	−24	39
27	−18	−7	46
33	−15	−9	47
36	−14	4	32
42	−20	4	−6
47	−10	5	0
52	−2	−1	13
60	13	0	1