Abstract
We present a non-destructive technique for the determination ofin situ stresses in concrete structures, reterred to as the core-drilling method. The method is similar to the American Society for Testing and Materials (ASTM) hole-drilling strain gage method, except that the core-drilling method is formulated in the current work are performed with traditional photogrammetry, and the more novel (and more accurate) three-dimensional digital image correlation. In this paper we review the background elasticity theory and we discuss the results of verification experiments on steel plates. Calculated normal stresses are within 17% of applied values for photogrammetry, and 7% for three-dimensional digital image correlation.
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Abbreviations
- a :
-
hole radius
- f c :
-
concrete compressive strength
- m :
-
radius of measurement circle
- r :
-
distance of any point to center of hole
- A, B, C, F, H, M, J :
-
material and geometric constants
- E :
-
modulus of elasticity
- U :
-
measured displacement
- ϕ(z), k(z), ψ(z), Φ(z), ψ(z):
-
analytic functions of complex variable
- A n ,a k ,a k :
-
Fourier series coefficients
- σ x , σ y , τ xy :
-
in-plane normal and shear stresses
- K x ,K y :
-
in-plane stress gradients
- α:
-
angle measured counterelockwise from thex-axis to the point of interest
- u, v :
-
radial and tangential relieved displacements
- α i , β, θ ij , θ ji :
-
geometrical parameters (see Fig. 1)
- ϕ:
-
Airy stress function
- μ:
-
modulus of rigidity
- ξ:
-
material constant for plane stress and plain strain
- υ:
-
Poisson's ratio
- dx, dy, θz:
-
rigid body horizontal, vertical and rotational displacements
- γ1, γ2, γ3 :
-
rigid body motion scaling factors
- ℜ:
-
real algebraic operator
References
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McGinnis, M.J., Pessiki, S. & Turker, H. Application of three-dimensional digital image correlation to the core-drilling method. Experimental Mechanics 45, 359–367 (2005). https://doi.org/10.1007/BF02428166
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DOI: https://doi.org/10.1007/BF02428166