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We analyse the action of fire, causing degradation in a concrete cantilever beam using dynamic testing. The structure is instrumented with two fibre Bragg gratings (FBG) sensors. One of them is used to measure vibration and another one is used to measure temperature inside of the cantilever beam, while the beam is exposed to fire. The temperature in the cantilever beam increased until 1 50 °C and a reduction in the strength of concrete can be observed through the modal analysis. A fibre Bragg grating interrogation system, based on tuneable filter method, is used for the static and dynamic measurements during the experiments. That system has low cost and it is easy to assemble and maintain when compared to other available instruments.