FIELD: construction.
SUBSTANCE: frequency of bridge span free oscillations is measured near a position, in which action of forces at it is balanced with application of a test signal. such as white noise. In this case the value of internal oscillation frequency may be measured with any predetermined accuracy as the maximum of signal spectrum from reaction of the bridge structure to white noise. At the same time the reference signal close to white noise is suggested as the traffic of vehicles or travel of railway echelon through the bridge.
EFFECT: increased accuracy and validity of structure stiffness and strength monitoring.
8 dwg
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