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

Table 2

Stress data from boreholes of different diameters determined using different strain gauges.

	100 mm diameter front borehole		75 mm diameter front borehole			50 mm diameter front borehole		50 mm diameter side borehole
Gauge specification	50AA	20AA	30AA	20AA	10AA	20AA	10AA	20AA	10AA
Stress (MPa)	−2.33	−2.37	−2.32	−2.35	−2.4	−2.25	−2.28	−1.27	−1.32