Experimental research on the time-varying law of performance for natural rubber laminated bearings subjected to seawater dry-wet cycles
Experimental research on the time-varying law of performance for natural rubber laminated bearings subjected to seawater dry-wet cycles
复制标题
海水干湿循环下天然橡胶层压支座性能时变规律的试验研究
DOI：
10.1016/j.engstruct.2019.05.101
复制
发表时间：
2019-09-15
影响因子：
5.5
通讯作者：
Zhou, Fulin
中科院分区：
文献类型：
--
作者：
Ma, Yuhong;Li, Yanmin;Zhou, Fulin
由于沿海地区的气候条件、风、浪等因素的影响，跨海或海上桥梁中的天然橡胶叠层支座(NRBs)极易受到海水干湿循环的影响。为了研究海水干湿循环对NRB基本性能的影响，对20个NRB和63个橡胶板材进行了为期60天的海水干湿循环试验。通过海水干湿循环试验，得到了NRBs水平刚度和竖向刚度的变化规律。此外，利用所提出的橡胶材料本构参数，建立了橡胶支座的有限元模型，对支座的性能和时变规律进行了仿真分析。并将试验结果与拟合和模拟结果进行了比较。最后，在60天试验结果外推的基础上，对NRB在120年寿命内的性能劣化规律进行了预测，并对NRB在120年寿命内的性能进行了有限元分析，验证了预测结果的可靠性。60d的试验结果表明，经过60d的试验，NRBs的水平和竖向刚度分别提高了23%和7%，并且水平和竖向刚度随着海水干湿循环试验时间的增加而线性增加。本文的研究成果为进一步研究NRBS的性能奠定了基础，对研究海水干湿循环作用下跨海桥梁等结构的抗震性能和全寿命周期性能具有重要意义。
Natural rubber laminated bearings (NRBs) in sea-crossing or offshore bridges are extremely vulnerable to seawater dry-wet cycles due to weather conditions, wind, waves, and other factors in coastal areas. Seawater dry-wet cycles test was conducted on 20 NRBs and 63 rubber sheets for 60 days to investigate the influence of seawater dry-wet cycles on basic NRB performance. The change laws that govern the NRBs' horizontal and vertical stiffness were obtained via seawater dry-wet cycles test. In addition, the proposed constitutive parameters of the rubber material were used to establish a finite-element model of the NRBs to simulate and analyze the bearings' performance and time-varying law. The test results were then compared with the fitted and simulated results. Finally, the performance deterioration law of the NRBs was predicted over a 120-year lifespan based on the extrapolation of the 60-day test results, and the finite element analysis of the performance for NRB within 120-year service life was done to verify the reliable of the prediction result. The 60 days test results show that the NRBs' horizontal and vertical stiffness increased by 23% and 7%, respectively, after test for 60 days, and horizontal and vertical stiffness increased linearly as the seawater dry-wet cycles test time increased. The findings presented in this paper lay a foundation for further research on the performance of NRBs and will play an important role in the study of the seismic resistance and life-cycle performance of sea-crossing bridges and other structures subjected to seawater dry-wet cycles.