海水干湿循环作用下天然橡胶支座橡胶材料性能劣化试验

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振动与冲击 ›› 2019, Vol. 38 ›› Issue (14) : 146-152.

论文

李艳敏1，马玉宏1，赵桂峰2，周福霖2

作者信息 +

Experimental study on the property deterioration of rubber material used as natural rubber bearing under seawater wet-dry cycles

LI Yanmin1，MA Yuhong1，ZHAO Guifeng2，ZHOU Fulin2

Author information +

文章历史 +

摘要

考虑到近海桥梁极易遭受晴雨交替变化天气、高湿高温及海风海浪交替作用等产生的海水干湿循环作用，针对天然橡胶隔震支座所使用的橡胶材料开展了同时同步的试验研究。重点探讨橡胶材料各项力学性能随海水干湿循环作用时间的变化规律。结果表明：海水干湿循环作用对橡胶材料的力学性能影响较大。经过了长达60天海水干湿循环试验后，橡胶材料的硬度和定伸应力均呈现增大的趋势，前者增大了约22%，后者增大了58.2%至118%，且大变形情况下的增长幅度更大；拉伸强度及扯断伸长率均呈降低趋势，分别降低了65.7%、51.53%，可能对橡胶支座的拉伸性能和极限剪切性能产生不利影响。以上研究成果可为橡胶材料的本构关系变化规律、橡胶隔震支座性能劣化规律研究，以及隔震结构全寿命性能评估和设计打下坚实的基础。

Abstract

Considering that offshore bridges are highly vulnerable to seawater wet-dry cycles caused by the weather of sunny or rainy, high humidity, high temperature, sea breeze et al., seawater wet-dry cycles tests were carried out on a natural rubber bearing and its rubber material for 60 days to investigate the mechanical properties deterioration of rubber material with the test time.The results show: the seawater wet-dry cycles have a greater influence on the mechanical property of rubber material.After testing for 60 days, the hardness of rubber material increases by about 22%, the strain stress under given elongation increases from 58.2%—118% and the rate of increase is even greater in large deformation.The tensile strength and elongation at break reduce by 65.7% and 51.53% respectively, which may affect the tensile property and ultimate shear property of the rubber bearing.The study can lay a solid foundation for the research on the variation of the constitutive relationship for rubber material, the performance deterioration of rubber bearings, the evaluation of life cycle performance and the design of isolation projects.

导出引用

李艳敏1，马玉宏1，赵桂峰2，周福霖2. 海水干湿循环作用下天然橡胶支座橡胶材料性能劣化试验[J]. 振动与冲击, 2019, 38(14): 146-152

LI Yanmin1，MA Yuhong1，ZHAO Guifeng2，ZHOU Fulin2. Experimental study on the property deterioration of rubber material used as natural rubber bearing under seawater wet-dry cycles[J]. Journal of Vibration and Shock, 2019, 38(14): 146-152

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