WIT Press

Fiber Optic Strain Gages For Stress Analysis By Means Of The Hole Drilling Technique


Free (open access)





Page Range

489 - 495




564 kb

Paper DOI



WIT Press


S. Sánchez-Beitia, I. Lombillo & L. Villegas


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


hole drilling, stress measurements, cultural heritage, masonry