Trend of Property Deterioration for Rubber Material Used in High Damping Rubber Isolation Bearing Under Aging-Marine Erosion Cycle
LIU Rong1,2, MA Yuhong1,2, ZHAO Guifeng2,3, WANG Kangkang1,2
1 Earthquake Engineering Research & Test Center, Guangzhou University, Guangzhou 510405, China; 2 Guangdong Key Laboratory of Earthquake Engineering & Applied Technique, Key Laboratory of Earthquake Resistance Earthquake Mitigation and Structural Safety Ministry of Education, Guangzhou 510405, China; 3 School of Civil Engineering, Guangzhou University, Guangzhou 510006, China
Abstract: Considering the isolation bearing setting at the lower position of the cross-sea bridge may suffer from circulatory action of aging and marine erosion, the experiment of the aging-marine erosion cycle for high damping rubber used in high damping rubber isolation bearings was carried out. The change rule of hardness, stress in definite strain, tensile strength and elongation at break of rubber were studied. The results indicated that aging-marine erosion cycles had a greater influence on property of rubber. The hardness and stress in definite strain of rubber showed an increasing trend with the change of aging-marine erosion cycle time, which increased by 21.05% and 128.87% to 244.95% respectively after 150 d of test. The tensile strength and elongation at break showed a decreasing trend. They decreased by 55.86% and 76.52% respectively after 150 d of the test, which are extremely unfavorable to the ultimate deformation capacity and tensile capacity of the high damping rubber isolation bearing. After 150 d, hardness and stress in definite strain increased when the deterioration depth is less than 20 mm,and the growth of surface rubber were 19.3% and 87.04% to 100.77% respectively. While tensile strength and elongation at break decreased in the range of deterioration depth of 10 mm, and the decreases of surface rubber were 44% and 57.9% respectively. These showed that the deterioration of rubber material properties mainly occured in the part close to the surface, and the internal rubber performance changed little.
刘荣, 马玉宏, 赵桂峰, 王康康. 老化-海蚀循环作用下高阻尼橡胶隔震支座橡胶材料性能劣化规律[J]. 材料导报, 2020, 34(4): 4166-4173.
LIU Rong, MA Yuhong, ZHAO Guifeng, WANG Kangkang. Trend of Property Deterioration for Rubber Material Used in High Damping Rubber Isolation Bearing Under Aging-Marine Erosion Cycle. Materials Reports, 2020, 34(4): 4166-4173.
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2020, Vol. 34 
