Method for identifying damage state of hinge joint of plate girder bridge

Abstract

A statistical evaluation method for hinge joint damage identification by using plate girder vibration acceleration monitoring data generated by passing vehicle is characterized by comprising the following steps: step 1, performing preprocessing, such as multi-point time synchronization, sample interception, low-pass filtering, screening and the like, on monitoring data of measuring points matched with the number of assembled plate girders under a normal vehicle, and generating an effective analysis sample set [S]; s2, calculating a signal energy set [E] of the effective analysis sample, and calculating a slab bridge vibration energy transverse transmissibility set [D]; s3, calculating a hinge joint damage state index crk, and generating a hinge joint damage state vector {CR}; and S4, calculating a hinge joint damage state statistical evaluation index Fstj through {CR}, and performing hinge joint damage state statistical evaluation according to Fstj. The method is easy to operate in practice, traffic is not interrupted, state evaluation criterion indexes are easy to express, calculation is easy, significance is clear, and the reliability of the evaluation conclusion based on statistics is high.

Description

technical field [0001] This application relates to the field of girder bridge safety monitoring. Background technique [0002] Simply supported slab girder bridges are generally referred to as slab girder bridges. Due to the advantages of low construction cost and easy maintenance, they are the main structural form of a large number of small and medium-sized bridges. , to form a horizontally integrated structural form of the bridge. Under the combined effects of material aging, long-term action of overloaded vehicles, and uneven settlement of the foundation, the failure and damage of cast-in-place hinge joints is prominent. The traditional evaluation of hinge joint status mainly depends on manual inspection, and there are also some methods based on measurement equipment. Evaluation of detection methods, but these existing methods basically rely on the measurement of static indicators such as displacement or strain, and none of the existing methods mentions the evaluation co...

AI Technical Summary

Problems solved by technology

Under the combined effects of material aging, long-term action of overloaded vehicles, and uneven settlement of the foundation, the failure and damage of cast-in-place hinge joints is prominent. The traditional evaluation of hinge joint status mainly depends on manual inspection, and there are also some methods based on measurement equipment. Evaluation of detection methods, but these existing methods basically rely on the measurement of static indicators such as displacement or strain, and none of the existing methods mentions the evaluation conclusions introduced by problems such as single measurement errors (or errors) As for the solution to unreasonable problems, there is no hinge joint evaluation method based on the analysis of bridge vibration acceleration monitoring data caused by driving, nor is there any evaluation criterion from the perspective of large sample statistical analysis

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