(广州大学工程抗震研究中心， 广州 510405)

［摘要］综合考虑冻融、海蚀和老化条件下GFRP隔震支座的材料组成和所处环境的情况，确定橡胶片性能变化是GFRP隔震支座力学性能变化的主要因素之一。对32个GFRP隔震支座分别开展海水腐蚀、高温老化和水冻水融试验，并分析试验前后橡胶片力学性能的变化规律。结果表明：在冻融、海蚀和老化条件下，橡胶片硬度、定伸应力和拉伸强度随着时间推移而增大，橡胶片拉断伸长率随着时间推移而下降。橡胶片在试验中力学性能变化率有所不同，考察时间、温度和水分因素对橡胶片力学性能影响，分析比较得出对于橡胶片力学性能劣化，温度影响显著，水分影响次之，时间影响甚微。

［关键词］橡胶片；隔震支座；冻融；海蚀；老化；性能劣化

中图分类号：TU352-1+2文献标识码：A文章编号：1002-848X(2021)08-0021-05

Experimental study on deterioration performance  of rubber sheet of GFRP isolation bearing under freeze-thaw，sea erosion and aging conditions

YUAN Pu, TAN Ping

(Earthquake Engineering Research Test & Center, Guangzhou University, Guangzhou 510405, China)

Abstract:Considering the material composition and environment of GFRP isolation bearing under freeze-thaw，sea erosion and aging conditions, it is determined that the change of rubber sheet performance is one of the main factors of GFRP isolation bearing performance change. The seawater corrosion, high temperature aging and water freezing and water thawing tests were carried out on 32 GFRP seismic isolation bearings, and the variation law of mechanical properties of rubber sheet before and after the tests were analyzed. The results show that the hardness, constant tensile stress and tensile strength of the rubber sheet increase with the passage of time，and the elongation at break of the rubber sheet decreases with the passage of time under freeze-thaw，sea erosion and aging conditions. The change rate of mechanical properties of the rubber sheet varied in the test, and the effects of time, temperature and water on the mechanical properties of the rubber sheet were investigated. The analysis and comparison shows that for the deterioration of the mechanical properties of the rubber sheet, the effect of temperature is significant, followed by the effect of water, and the effect of time is very little.

Keywords:rubber sheet;isolation bearing;freeze-thaw;sea erosion;aging;performance deterioration

作者简介：袁谱，博士，高级工程师，Email：yuan_pu @yeah.net；

通信作者：谭平，博士，研究员，博士生导师，Email：ptan@gzhu.edu.cn。