The aim of this work was to develop and validate an experimental methodology suitable for analysing on-site the behaviour of fibre-reinforced wooden structures. The proposed measurement method is based on the application of fibre Bragg grating (FBG) strain sensors. An analysis of adhesive behaviour was performed preliminarily, which provided indications for choosing the type of adhesive and for the fibre bonding length in accordance with the volume of measurement. The first series of tests was carried out on wood samples to verify the coupling between the measuring sensor and the wood support when the latter is subject to mechanical stresses. The second investigation was done on site to test the behaviour of a historical wood floor before and after reinforcement by means of a series of tests performed using optical fibres with the Bragg grating. The optical fibre system measurements were compared to those obtained using a laser vibrometer, a measurement system of proven stability and precision. The comparison makes it possible to confirm the validity of the results and the reliability of the system for the monitoring of historic wooden structures.
A study of the behavior under shear of existing wooden floors reinforced with different materials and techniques has been carried out. The purpose of this study was to perform an experimental and numerical analysis of the shear properties of existing and reinforced wood beam floors. The wooden floors were reinforced using composite materials, reinforced concrete flat plate and wood planks. The experimental results show a significant increase in shear strength and stiffness of reinforced floors compared to those unreinforced. Numerical applications regarding the shear behavior of un-reinforced and reinforced wood floor are also presented. The comparison between the experimentally and theoretically determined shear stiffness also provided useful information for practical applications.
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