The Hole-drilling Technique For The Stresses
Measurements In Brick Masonries
Author(s)
S. Sánchez-Beitia
Abstract
This paper deals with the application of the hole-drilling technique for the
measurement of the stresses in the structural elements of cultural heritage
constructions. The method involves glued strain gages at the surface of a piece of
masonry. The drilling device is a diamond crown extracting a cylinder of
material in a concentric way with the circumference (12 cm diameter) of the
strain gages position. At least three strain gages are placed in the area under
consideration. The strain gages record the strains originated by stress relaxation
after extracting a round of 3.6 cm diameter and 4.8 cm in depth. The stresses
before drilling can be deduced with an appropriate mathematical scheme. This
experimental procedure has been called Donostia Method by the author in
previous works being an ASTM technique. Brick masonry has been built and
loaded at the laboratory in order to check the method before actual works on site
take place. This constructive element is widely used in cultural heritage
constructions. A known stress has been applied to the masonry in order to
compare it with the results obtained by means of the hole-drilling technique. The
results obtained are very close to what is expected. The technique is harmless for
the material and allows the deduction of the principal stresses and their
directions for a bi-dimensional state of stresses on the surface. In addition, the
method allows for the measurement of tensile stresses. Thus the hole-drilling
technique is a minor-destructive method of testing giving more information than
the flat jacks technique. The deduction of the stresses is strongly influenced by
the constants that relate them with strains measured after drilling. This paper
analyzes two different methods to deduce such constants.
Keywords: architectural heritage, structural analysis, the Donostia Method,
hole-drilling technique.
Keywords
architectural heritage, structural analysis, the Donostia Method,
hole-drilling technique.
Related Book
Other papers in this volume
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