摘要
为探讨橡胶隔震支座在海洋环境下的性能劣化规律,综合考虑橡胶支座的材料组成、实际使用荷载和所处环境,确定老化、海水腐蚀及使用荷载等影响其性能的主要因素,对多个橡胶支座开展了老化、海蚀及使用荷载试验,并进行了试验前后的对比,详细分析了支座性能的变化规律。最后,在实际工程中引入分项系数来综合考虑支座所处的环境因素及载荷作用,进而对支座力学性能进行预估。结果表明:在多种因素综合作用下,老化的影响最不利;支座生产质量的好坏直接决定其受影响程度,单纯海蚀试验下,质量优良的支座性能受到的影响较小,而质量有缺陷的支座受到的影响极大;海蚀试验、多种荷载作用试验会使支座的刚度变小,说明长期作用可能引起支座竖向变形过大,造成内部损伤,无法保证其在正常使用时的稳定性、舒适性和安全性。
In order to investigate the performance deterioration law of rubber isolators under marin environment,a series of tests were conducted.After a comprehensive consideration of material composition,practical using load and the real environment of rubber bearing,the aging,marine corrosion and normal using load were taken as main influence factors of performance of the isolated bearing for offshore bridge,and aging marine corrosion and using load tests were put forward on several rubber bearings.Change law of bearing performance was analyzed in detail through comparing pre-test and post-test results.At last,partial safety factor considering the effects of environment and load was introduced in real engineering to estimate the mechanics performance of rubber bearing.The results show that the aging is the most unfavorable influence factor of all the factors for rubber bearing.Production quality of the isolated bearing is veryimportant for its mechanics performance.Under the marine corrosion test,good quality rubber bearings are little influenced,but the performances of poor quality bearings will be influenced greatly.The marine corrosion and multiple actual loads would decrease the stiffness of rubber isolator,which means that these long-term effects may increase vertical deformation,causing internal damage of rubber bearings.Also,the stability,comfort and security of rubber bearings cannot be guaranteed during normal use.
出处
《中国公路学报》
EI
CAS
CSCD
北大核心
2016年第2期52-61,共10页
China Journal of Highway and Transport
基金
国家重点基础研究发展计划("九七三"计划)项目(2011CB013606)
国家自然科学基金项目(51578170)
国家自然科学基金高铁联合基金重点项目(U1334209)
教育部长江学者和创新团队发展计划项目(IRT13057)
广州市属高校科技计划项目(1201421152)
关键词
桥梁工程
橡胶隔震支座
老化及海蚀试验
性能劣化
海洋环境
bridge engineering
rubber isolator
aging and marine corrosion test
performance deterioration
marine environment
