Damage Evolution and Fatigue Life of Steel Wire with Double Corrosion Pits for Suspension Bridge under Wind- and Traffic-loads

doi:10.11902/1005.4537.2022.380

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (6): 1358-1366 DOI: 10.11902/1005.4537.2022.380

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Damage Evolution and Fatigue Life of Steel Wire with Double Corrosion Pits for Suspension Bridge under Wind- and Traffic-loads

HE Xun¹, WU Mengxue¹(

), YIN Li¹, ZHU Jin²

^1.School of Civil Engineering and Geomatics, Southwest Petroleum University, Chengdu 610500, China
^2.Department of Bridge Engineering, Southwest Jiaotong University, Chengdu 610031, China

Cite this article:

HE Xun, WU Mengxue, YIN Li, ZHU Jin. Damage Evolution and Fatigue Life of Steel Wire with Double Corrosion Pits for Suspension Bridge under Wind- and Traffic-loads. Journal of Chinese Society for Corrosion and protection, 2023, 43(6): 1358-1366.

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Abstract

To investigate the course of fatigue damage evolution and fatigue life of the corroded steel wire with double corrosion pits for suspension bridges, a model of high-strength steel wire with double corrosion pits was established through finite element software ANSYS. Based on continuum damage mechanics combined with the time-history data of sling stress of suspenders acquired from the wind-traffic-bridge coupling vibration analysis, the course of fatigue damage evolution for the high-strength steel wire with double corrosion pits under different operation conditions was studied. Meanwhile, the influence of wind speed, traffic load, suspender position, shape of corrosion pit and shape of asymmetric double corrosion pits on the course of damage evolution and fatigue life of the high-strength steel wire with double corrosion pits was discussed respectively. The results show that the corrosion fatigue life of the steel wire with double corrosion pits is more sensitive to high wind speed rather than low wind speed. Moreover, the corrosion fatigue life of steel wire decreases with the increase of the traffic flow under the same wind speed. When the wind and traffic flow are coupled, the corrosion fatigue life of high-strength steel wire with double corrosion pits is obviously lower than that without traffic flow. The short suspender at the bridge mid-span has shorter corrosion fatigue life than that of the longest ground suspender and suspender located at 1/4 span. Furthermore, it is found that the greater the depth-width ratio of the corrosion pit, the sharper shape the corrosion pit, thus the shorter the corrosion fatigue life of the steel wire with double corrosion pits. When the shape of double corrosion pits is asymmetric, the corrosion fatigue life of suspender steel wire is mainly determined by the pits with larger depth-width ratio.

Key words: corrosion fatigue damage evolution fatigue life high-strength steel wire double corrosion pits

Received: 05 December 2022 32134.14.1005.4537.2022.380

ZTFLH:

TU313

Fund: National Natural Science Foundation of China(51708470);Young Scientific and Technological Innovation Team of Bridge Safety Assessment of Southwest Petroleum University(2018CXTD07);Science and Technology Plan Project of Sichuan Provincial Department of Science and Technology(2020YJ0080);Special Support from China Postdoctoral Science Foundation(2019TQ0271)

Corresponding Authors: WU Mengxue, E-mail: mx_swpu@126.com

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https://www.jcscp.org/EN/10.11902/1005.4537.2022.380 OR https://www.jcscp.org/EN/Y2023/V43/I6/1358

Fig.1 Schematic diagram of side elevation of the suspension bridge and suspenders at key positions (Unit: m)

Fig.2 Stress response time histories of three typical suspenders S1 (a), S19 (b) and S36 (c) under combined load of wind and traffic flow

Table 1 Stress data of the suspenders S1, S19 and S36 under different wind speed and traffic flow conditions in one day^[19]

Fig.3 Schematic diagram of a steel wire with a single semi-ellipsoidal pit

Fig.4 Sectional view (a) and top view (b) of the steel wire with double semi-ellipsoidal pits

Mesh accuracy mm	Maximum nodal stress MPa	Maximum element stress MPa	$S N / S E$
0.1	808.79	812.52	99.54%
0.2	800.63	810.75	98.75%
0.3	789.99	814.45	97.00%
0.4	764.50	841.50	90.85%

Table 2 Calculation results of

S N

and

S E

under the conditions of four grid sizes

Fig.5 Mesh division of finite element model for the steel wire with double corrosion pits

Fig.6 Relationship between load cycle and block cycle

Fig.7 Von Mises stress contours nearby the double corrosion pits after operation for 17.5 a (a), 25.0 a (b), 30.0 a (c) and 38.5 a (d)

Fig.8 Damage of sling wire at different time points

Fig.9 Von Mises stress distribution nearby the double corrosion pits along z-axis (a) and x-axis (b)

Fig.10 Damage degrees of suspender steel wire at different wind speeds

Fig.11 Damage degrees (a) and corrosion fatigue life (b) of suspender steel wire under different traffic flow conditions

Fig.12 Damage degrees of suspender steel wire at different positions

Fig.13 Damage degrees of suspender steel wire under different shape parameters

Fig.14 Damage degrees of suspender steel wire with asymmetrical pits

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