Method and a device for optimizing safety monitoring indexes of a concrete beam bridge

Abstract

The invention relates to a concrete beam bridge safety monitoring index optimization method and device, and the method comprises the steps: S1, receiving a collected bridge structure strain signal, and carrying out the analysis and reconstruction of the strain signal through employing multi-resolution wavelet analysis, so as to eliminate the environment temperature and data noise; S2, on the basisof the set threshold interval, extracting a peak value and a valley value, exceeding the threshold interval, caused by the same live load to form a binary array, and obtaining a strain response amplitude caused by single vehicle excitation; And S3, calculating a corresponding neutral axis height according to strain response amplitudes at different heights of the monitored cross section, carryingout data integration on the neutral axis safety index within one day, and calculating a statistical property including probability distribution as an optimized safety monitoring index. Compared with the prior art, the method adopts a statistical tool to analyze and evaluate the statistical characteristics of the neutral axis distribution, and is more suitable for long-term monitoring of the bridgestructure.

Description

technical field [0001] The invention relates to the field of structural safety monitoring, in particular to a method and device for optimizing safety monitoring indicators of concrete girder bridges. Background technique [0002] Beam bridges occupy an unshakable main position in highway bridges. With the increase of bridge service life, a large number of newly built bridges are gradually entering the "aging" stage, and various forms of structural degradation inevitably occur. It can be seen that it is urgent to carry out research on safety monitoring of girder bridges under operating conditions. By selecting reasonable and common safety indicators for long-term monitoring, the structural degradation process of the target bridge can be effectively grasped, so as to judge the safety reserve of the target bridge and carry out preventive maintenance. [0003] The neutral axis is considered as a potential safety indicator that can be used for long-term monitoring of bridges. ...

AI Technical Summary

Problems solved by technology

At low strain amplitudes, the uncertainty of various parameters and the lack of measurement accuracy will significantly weaken the safety indication performance of the neutral axis

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