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| Experimental Research on the Apparent Corrosion Law of the Suspension Bridge Main Cable Steel Wire under Status of Holding Force |
| HONG Hua1,2, CAO Su-gong1,2,3, FU Jun-lei1,3, TIAN Hao1,3 |
1. Zhejiang Scientific Research Institute of Transport, Hangzhou Zhejiang, 311305, China;
2. Department of Bridge Engineering, Tongji University, Shanghai 200092, China;
3. Zhejiang Provincial Engineering Research Center for Intelligent Operation and Maintenance Technology of Highway Bridge and Tunnel, Hangzhou Zhejiang 310023, China |
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Abstract Aiming at the problem of the corrosion law of the suspension bridge main cable steel wire under status of holding force, a set of electrolytic accelerated corrosion test device with preload was designed. The electrolytic accelerated corrosion test of the main cable steel wire of the suspension bridge in the state of holding force suspension bridge main cable steel wire under status of holding force was carried out. A total of 60 steel wires with diameter 5.25mm were selected under four working conditions of 0, 1000, 2000 and 3000με. The quality and diameter of steel wire after 0-4 days of electrolysis accelerated corrosion were measured. Also the change law of the average mass loss rate and cross-sectional loss rate of the main cable steel wire with strain and time growth was discussed. The results of the tests showed that with the increase of strain level and corrosion time, the corrosion of steel wire under the stress state is more obvious, the fluctuation of local characterization is more intense, and the corrosion presents a nonlinear growth trend. The mass loss of the steel wire with 3000 με after four days of accelerated electrolytic corrosion is similar to the 420 days test result of natural corrosion, and the change trend is consistent. Under accelerated corrosion conditions, the average mass loss rate of steel wire with 3000 με after four days of accelerated electrolytic corrosion is 6.40 times that of one day. At the same time, the average mass loss rate of steel wire with 3 000 με after one to four days of accelerated electrolytic corrosion are 1.17 times, 1.22 times, 2.27 times and 3.02 times than 2000 με respectively. The maximum section loss rate increases with the increase of strain and time, and it has a good correlation with the two variables. Therefore, the maximum section loss rate can be considered as the core intermediate variable to measure the corrosion grade of main cable steel wire.
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Received: 18 August 2021
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| Fund:Supported by the Key Research and Development Program of Zhejiang Province (No.2021C01106); the Independent Research and Development Projects of Zhejiang Scientific Research Institute of Transport (No.ZK202301) |
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2022, Vol. 16 
