Fiber Optic Strain Gages For Stress Analysis By
Means Of The Hole Drilling Technique
Author(s)
S. Sánchez-Beitia, I. Lombillo & L. Villegas
Abstract
The article deals with the application of the hole drilling technique on structural
elements of architectural heritage constructions by using eight fiber optic strain
gages. The objective of the research is the on site deduction of the stress state on
stone masonry of architectural heritage constructions. The hole drilling method is
a Minor Destructive Testing (MDT) giving information about the Principal
Stresses of the local stress state around the measured zone and, in consequence,
it favours the estimation of the stresses associated with a certain direction, for
example the vertical stress of a stone masonry element. Fiber optic technology
allows the storage of the strains in the strain gages even when the unit of
measure is temporarily not connected. Thus it will be able to monitor the stress
measurements as a time function.
The tests carried out have compared the applied loads in a laboratory machine
with the results obtained by the hole drilling technique through fiber optic strain
gages. Until now only resistive strain gages have been used. In this sense the
contribution is innovative with an evident advance towards the complete
structural characterisation of stone masonry structural elements.
Keywords: hole drilling, stress measurements, cultural heritage, masonry
1 Introduction
The hole drilling technique has been widely applied in previous works to obtain
the existent stresses in the structural elements in constructions of cultural
heritage [1–5]. The method is based on the strains caught by resistive strain
gages (RSG) glued over the element. These kinds of strain gages (made of
Keywords
hole drilling, stress measurements, cultural heritage, masonry
Related Book
Other papers in this volume
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