期刊名称：IOP Conference Series: Earth and Environmental Science
印刷版ISSN：1755-1307
电子版ISSN：1755-1315
出版年度：2019
卷号：304
期号：4
页码：1-18
DOI：10.1088/1755-1315/304/4/042025
出版社：IOP Publishing
摘要：At present, the behavior deterioration trend of friction pendulum bearings (FPBs) widely used in offshore bridges under marine environment isn't still clear. In this study, periodic-salt-spray and wetting–drying cycle accelerated corrosion tests were used to simulate the corrosion circumstances of FPBs in the splash and atmospheric zones, respectively. Eight sets of FPBs with a vertical bearing capacity of 35 t were designed as test samples. The environmental factors that affect the bearing behavior deterioration were analyzed; the test accelerated ratios of the factors were discussed; two kinds of test schemes were designed for the FPBs; and the macroscopic appearances of the FPBs at different corrosion times were observed. The trends of the initial static and dynamic friction coefficients with corrosion time were extensively analyzed, and the behavior deterioration trends of the mechanical properties of the FPBs were analyzed. The results show that in both the splash and atmospheric zones, the initial static and dynamic friction coefficients with corrosion time show an increasing periodic curve, but the behavior deterioration trend and period of FPBs in different locations are different. The vertical and horizontal stiffness of FPBs almost did not change with the corrosion time. The trends of equivalent damping ratio with the corrosion time are consistent with the dynamic friction coefficient. Based on the experimental results, the behavior deterioration trends of the initial static and dynamic friction coefficients of FPBs with corrosion time were obtained, which provides a basis for the seismic performance evaluations of offshore isolated bridges in their entire service lifetime.
