Method for predicting the risk of corrosion and fracture of cable-stayed bridges

Abstract

The invention discloses a method for predicting the corrosion fracture risk of a bridge tension sling rod, which comprises the following steps of: S1, collecting the corrosion event data of the bridgetension sling rod; S2, the information of the fracture events of the tension sling bar being inversely analyzed based on the fault tree, and the corrosion risk scenario of the tension sling bar beingobtained. S3, selecting the cable replacement life of the cable rod as the classification index; S4 cluster analysis being carried out according to the information of cable rod replacement, and the cable replacement life being divided into the longest, the longest, the middle and the shortest. S5 establishing a simplified Markov matrix model of the deterioration of the annual technical conditionof the bridge, and calculating the probability distribution of the technical condition of the bridge when the average service life is reached; S6, calculating the degenerated Markov matrix parametersof each type of cable rod with different cable replacement years; 7, obtaining a risk occurrence probability model; S8, establishing a risk loss probability model; S9 obtaining the risk occurrence probability and risk loss probability of the cable-stayed bridge which need to be predicted, and calculating the death number and economic loss of the people who have lost all kinds of risk.

Description

technical field [0001] The invention relates to the technical field of bridges, in particular to a method for predicting the risk of corrosion and fracture of a suspension cable rod of a bridge. Background technique [0002] Corrosion of steel wire is the most frequent disease in the inspection of the sling rod, and it is also the most direct cause of failure of the sling rod; the corrosion of the steel wire of the sling rod is mainly caused by the contact of the steel wire with the corrosive medium, such as entering the interior of the cable body Rainwater, moist air, and even the intrusion of microorganisms may cause the corrosion of steel wires; in addition, there are gaps between steel wires whether it is parallel steel wires or steel strands. Moisture in the air will condense, which will cause water accumulation inside the steel wire in the cable, and accelerate the corrosion of the steel wire; because the protective structure of the pulling sling rod has a certain degr...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the existing methods for assessing the risk of corrosion of the bridge pull and sling in the prior art, either it is difficult to determine the key parameter of the critical corrosion depth and the workload is large, or it is limited by the accuracy of the detection instrument and cannot achieve a more accurate Prediction, or need to open the protective layer for testing, it is difficult for the owner to accept the above shortcomings, to provide a method for predicting the risk of corrosion and fracture of the bridge pull hanger bar

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