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SHM of bridges

SHM of bridges is one of the most popular applications. The most obvious is to use deformation sensors of a certain length, e.g. 1 meter long, which measure the changes in length (either elongation or contraction) between the two points. This allows to measure static changes, for example between beam and pillar, state and development of cracks, beams bending etc. It is also possible to use sensors to measure dynamic changes caused by bridge load (for example train passage). There are also used sensors of tilt, displacement sensors, or vibration sensors.