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Fatigue test of metal rubber bridge bearings |
ZHANG Heng1, XIA Xiushen1, QIAO Xin1, ZHU Zhijie1, DAI Shengyong2 |
1.School of Civil Engineering, Lanzhou Jiaotong University,Lanzhou 730070,China;
2.China Railway Eryuan Engineering Group Co., Ltd., Chengdu 610031, China |
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Abstract With a highway bridge as the engineering background, two full-scale metal-rubber bridge bearing specimens were designed and fabricated, and 2 million times of vertical fatigue tests were carried out to explore the change of mechanical properties of the bearings before and after fatigue. During the fatigue test, a compression test was conducted every 200,000 cycles, and a set of vertical compression hysteresis curves of the bearings were obtained. The horizontal shear hysteresis curves were obtained from the bearing compression shear test before and after the fatigue test. The fatigue damage factor was introduced to quantitatively characterize the fatigue damage of the metal-rubber bridge bearings. The results showed that the fatigue damage of the metal-rubber bridge bearing was mainly manifested by the wear between the internal metal wires, local broken wires and lost wires. The fatigue damage will significantly reduce the horizontal bearing capacity, post-yield stiffness and equivalent shear stiffness of one side of the bearing, and make the horizontal shear hysteresis curve of the bearing become obviously asymmetric, but will increase the overall energy dissipation capacity of the bearing. The shear equivalent stiffness, vertical equivalent stiffness and vertical equivalent damping ratio after 2 million fatigue cycles are less than 0.3, and the bearing has good fatigue performance.
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Received: 17 July 2023
Published: 28 March 2024
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