A Prediction Method for the Risk of Corrosion and Fracture of Suspension Rods of Bridges
A prediction method and sling technique, which are applied in prediction, data processing application, calculation, etc., can solve the problems that the accuracy of detection instruments cannot reach more accurate predictions, it is difficult to determine the critical corrosion depth, and the workload of key parameters is large. Reliable quantitative risk results, improving pre-control capabilities and emergency response levels, reducing casualties and property losses
Active Publication Date: 2019-10-18
RES INST OF HIGHWAY MINIST OF TRANSPORT
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[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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[0050] like Figure 1-6 As shown in the present invention, a method for predicting the risk of corrosion and fracture of a bridge pull sling bar comprises the following steps:
[0051] S1. Collect information on the deterioration of the technical condition of bridges in my country's bridge library, archive information on decommissioned bridges, statistical data and case data on the incidents of corrosion and fracture of suspension rods. The case data includes information on the deterioration of technical conditions of 809 bridges and 357 decommissioned bridges Archive information, information on 18 incidents of corrosion and breakage of bridge pull and hanger rods, and information on 53 bridge pull and hanger rod replacements;
[0052] S2. Carry out an inversion study on the breakage event information of the pulling sling rod based on the fault tree, and draw a risk scenario map of the corrosion of the pulling sling rod, as Figure 2-4 As shown, different risk scenario diagram...
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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...
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IPC IPC(8): G06Q10/04G06Q10/06
Inventor 王玉倩毛燕杨昀张科超
Owner RES INST OF HIGHWAY MINIST OF TRANSPORT