Detection for corrosion of stayed cable and evaluation method thereof

Abstract

The invention discloses a detection of corrosion of a stayed cable and an evaluation method thereof. The method comprises the following steps: setting up an early warning detection device for corrosion of the stayed cable, using a test cable to simulate a bridge stayed cable; detecting the test cable, when the steel wire of the test cable with median diameter lower than 2.0mm exceeds 2% of total amount of the steel wire in the stayed cable, a profile cable detection is performed to the test cable, detecting the bridge stayed cable; evaluating the residual bearing capacity; and setting up an detection interval of the stayed cable for further. Compared with the present other methods, the detection method of the invention is more accurate, and the failure of the stayed cable caused by the oversized detection interval can be avoided, and the increased maintenance cost due to the undersized detection interval can be avoided either.

Description

technical field [0001] The invention belongs to the field of bridge engineering, and relates to a method for detecting the corrosion degree of stay cables on a cable-stayed bridge, in particular to a method for detecting and evaluating the corrosion degree of stay cables in use. Background technique [0002] Corrosion stay cable evaluation mainly consists of four parts: [0003] 1. Prediction of bridge loads; [0004] 2. Prediction of the corrosion rate of the steel wire in the cable; [0005] 3. Predict the corrosion degree of each steel wire on the section of the cable, and determine the mechanical indicators related to the bearing capacity of the steel wire; [0006] 4. The evaluation method of calculating the bearing capacity of the cable from the bearing capacity of the steel wire. [0007] 1. Bridge Load Forecasting [0008] According to the test results of many bridge cables in China (Xinjiang Kongquehe Bridge slings fail after 70% of the wires are corroded and br...

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Problems solved by technology

[0027] 1 The corrosion degree of the actual steel wire is not considered, but the steel wire is simply divided into two types: corroded steel wire and uncorroded steel wire, and the influence of the corrosion distribution of the steel wire in the actual cable on the cable bearing capacity is not considered;

[0028] 2 The influence of residual deformation on the internal force distribution of the structure after the local steel wire enters the yield or even strengthening stage due to severe corrosion is not considered

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