摘要
考虑到设置于跨海大桥位置较低处的隔震支座可能会遭受海水侵蚀和老化的循环作用,开展了高阻尼橡胶隔震支座橡胶材料海蚀-老化循环作用试验,研究了橡胶的硬度、定伸应力、拉伸强度及扯断伸长率随劣化时间和劣化深度的变化规律。结果表明,老化-海蚀循环作用对橡胶性能影响较大。随着老化-海蚀循环作用时间的延长,橡胶的硬度、定伸应力呈增长趋势,试验150 d后分别增长了21.05%和128.87%~244.95%;拉伸强度和扯断伸长率则呈减小趋势,试验150 d后分别下降了55.86%和76.52%,这对高阻尼橡胶隔震支座的极限变形能力和抗拉能力极为不利。经历150 d老化-海蚀循环作用后,硬度和定伸应力主要在劣化深度20 mm范围内增大,表层橡胶分别增长19.3%和87.04%~100.77%;拉伸强度和扯断伸长率在劣化深度10 mm范围内下降,表层橡胶分别减小44%和57.9%,说明橡胶材料性能劣化主要发生在距离表面较近的部分,内部橡胶性能变化较小。
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.
作者
刘荣
马玉宏
赵桂峰
王康康
LIU Rong;MA Yuhong;ZHAO Guifeng;WANG Kangkang(Earthquake Engineering Research&Test Center,Guangzhou University,Guangzhou 510405,China;Guangdong Key Laboratory of Earthquake Engineering&Applied Technique,Key Laboratory of Earthquake Resistance Earthquake Mitigation and Structural Safety Ministry of Education,Guangzhou 510405,China;School of Civil Engineering,Guangzhou University,Guangzhou 510006,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2020年第4期166-173,共8页
Materials Reports
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)
广东省自然科学基金项目(2017A030313298)
广州市科技计划项目(201707010295)~~
关键词
老化-海蚀循环
高阻尼橡胶
隔震支座
性能劣化
aging-marine erosion cycle
high damping rubber
isolation bearing
property deterioration
