Main indicators for health monitoring of casting crane bridge structure

The structural health monitoring of the casting crane is to evaluate the safety degree or health status of the metal structure as a whole and key parts by means of on-site inspection and testing or by means of installing sensors to remotely transmit test signals. It is a safety assessment of the structural bearing capacity, and also includes the risk assessment and estimation of the service life of structural members after long-term use of strength damage accumulation, The analysis results will prompt the user to know the safe service life or update time point of the equipment. The main indicators of structural health monitoring are shown in the table.

Indicator TypeIndex contentDetection meansSignificance
Strength evaluationMaximum stress of main beam, maximum shear stress of main beamField test or remote monitoringStress increases at the end of service life
Stiffness evaluationUpper camber, horizontal bending and lower deflection of main beamOn site inspectionObvious attenuation in late life
Dynamic stiffness evaluationDynamic stiffness of the whole machineField test or remote monitoringObvious attenuation in late life
Stability evaluationWeb waviness, vertical deflection and horizontal deflection of upper cover plateOn site inspectionLong term stability of indicators before structural failure
Fatigue evaluationFatigue life estimation of main beamField test or remote monitoringMonitoring the change of stress spectrum
Metal crackingWelds and base metal of main beam, end beam and wheel seatNDT or visual inspection under strong lightRegularly burst in groups at the end of life

Among the main indicators of structural health monitoring, the change of dynamic stiffness index is a data that is easy to be ignored. Current engineering examples show that the change of dynamic stiffness index is related to structural risk, and the decline of dynamic stiffness indicates the rise of structural risk.

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