A method for identifying damage status of hinge joints in slab girder bridges

Abstract

The statistical evaluation method that utilizes the plate girder vibration acceleration monitoring data generated by the running of the vehicle to carry out hinge damage identification, is characterized in that, comprises the following steps: The first step S1: by the monitoring of the measuring points that are adapted to the number of plate girder assembling under the normal vehicle The data is subjected to multi-point time synchronization, sample interception, low-pass filtering, screening and other preprocessing to generate an effective analysis sample set [S]; the second step S2: Calculate the signal energy set [E] of the effective analysis samples, and calculate the vibration of the board and bridge The set of lateral energy transfer rate [D]; the third step S3: Calculate the damage state index cr of the hinge joint k , generate the joint damage state vector {CR}; the fourth step S4: Calculate the statistical evaluation index F of the joint damage state from {CR} stj , according to F stj Statistical assessment of the damage status of hinge joints. The method of the invention is easy to operate in practice, does not interrupt traffic, the expression of the state evaluation criterion index is simple, easy to calculate, and has clear meaning, and the evaluation conclusion based on statistics is highly reliable.

Description

technical field [0001] The present application relates to the field of beam 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 cost and easy maintenance, they are the main structural form of a large number of small and medium-sized bridges. This type of bridge consists of multiple hollow slab girders and then added cast-in-place hinged joint members. , to form the horizontal integral structural form of the bridge. Under the combined action of factors such as material aging, long-term action of overloaded vehicles, and uneven settlement of the base, the problem of failure and damage of cast-in-place hinge joints is prominent. The traditional assessment of hinge joint status is mainly completed by manual inspection, and there are also measures based on measurement equipment. Evaluation and detection methods, but these existing methods basically rely on the ...

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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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