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60d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%~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。
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.
作者
李艳敏
马玉宏
赵桂峰
周福霖
LI Yanmin;MA Yuhong;ZHAO Guifeng;ZHOU Fulin(Earthquake Engineering Research&Test Center,Guangzhou University,Guangzhou 510405,China;School of Civil Engineering,Guangzhou University,Guangzhou 510006,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2019年第14期146-152,222,共8页
Journal of Vibration and Shock
基金
国家自然科学基金(51578170
51678173)
国家自然科学基金高铁联合基金重点项目(U1334209)
长江学者和创新团队发展计划项目(IRT13057)
广东省自然科学基金(2017A030313298)
广州市科技计划项目(201707010295)
关键词
海水干湿循环
橡胶隔震支座
橡胶材料
力学性能
seawater wet-dry cycles
rubber bearing
rubber material
mechanical property
