Investigation of Multiple Damage Mechanisms in Pin Rods of Short Suspenders on a Long-Span Suspension Bridge
Publication: Journal of Bridge Engineering
Volume 27, Issue 5
Abstract
Pin joints are widely used connections for hanger assembly in suspension bridges. Significant rotary motions have been observed between pin rods and the connected members for long-span bridges subjected to traffic and environmental vibrations. Besides, the pin rods are under complex loading conditions and harsh environments, so they are prone to multitype damages. According to the investigations on the pin rods of suspenders at the midspan of the Jiangyin Yangtze Bridge, three main damaging mechanisms were found in the most damaged section covered by the lubricating bushing. It is observed that the half of the pin rod tightly contacted with the gusset plate was severely worn due to the galling seizure, while pitting corrosion was the predominant damage in the other half of the pin rod. Between the two zones, a small transition area was found damaged in the form of oxidational wear, indicating that it is affected by both friction and corrosion. It was found that the shear stress and bending stress are not threatening to the safety of the pin rods due to the appropriate material selection and sufficient load-bearing capability. However, stress concentration increased significantly due to the sharp step planes at the joint of the fork socket and the gusset plate, which is potentially risky to promote fracture of the pin rod.
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Acknowledgments
The financial support from the Natural Science Foundation of China (Grant No. 51978156), the China Postdoctoral Science Foundation (Grant No. 2020M681460), and the Natural Science Foundation of Jiangsu Province (Grant No. BK20210255) are gratefully acknowledged.
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Published In
Journal of Bridge Engineering
Volume 27 • Issue 5 • May 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Aug 19, 2021
Accepted: Jan 13, 2022
Published online: Mar 11, 2022
Published in print: May 1, 2022
Discussion open until: Aug 11, 2022
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