Influence of Steel Reinforcement on In-Situ Stress Evaluation in Concrete Structures by the Core-Drilling Method

The core-drilling method is an emerging technique for evaluating in-situ stress in a concrete structure. A small hole is drilled into the structure, and the deformations in the vicinity of the hole are measured and related via elasticity theory to the stress. The method is similar to the ASTM hole-d...

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Bibliographic Details
Main Authors: McGinnis, M. J., Pessiki, S.
Format: Conference Proceeding
Language:English
Subjects:
CONCRETES
DEFORMATION
DRILLING
EVALUATION
MACHINING
MATERIALS SCIENCE
NONDESTRUCTIVE TESTING
STEELS
STRAIN GAGES
STRAINS
STRESS ANALYSIS
STRESSES
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Summary:The core-drilling method is an emerging technique for evaluating in-situ stress in a concrete structure. A small hole is drilled into the structure, and the deformations in the vicinity of the hole are measured and related via elasticity theory to the stress. The method is similar to the ASTM hole-drilling strain-gauge method excepting that displacements rather than strains are the measured quantities. The technique may be considered nondestructive since the ability of the structure to perform its function is unaffected, and the hole is easily repaired. Displacement measurements in the current work are performed using 3D digital image correlation and industrial photogrammetry. The current paper addresses perturbations in the method caused by steel reinforcement within the concrete. The reinforcement is significantly stiffer than the surrounding concrete, altering the expected displacement field. A numerical investigation performed indicates an under-prediction of stress by as much as 18 percent in a heavily reinforced structure, although the effect is significantly smaller for more common amounts of reinforcement.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.2184682