Lifecycle Evaluation of Base-Isolated Rubber Bearings Considering Environmental Deterioration

摘要

The heat acceleration deterioration test was carried out so that the heat deterioration characteristics of NR and HDR were investigated. In this test, time, temperature and the "depth" dependency of the heat deterioration were evaluated. As the results of the test, there were different deterioration characteristics between NR and HDR. At the beginning of the deterioration, M25 of HDR increased to almost 20% on surface, but one of NR rarely changed. After the long-term deterioration, material properties of NR changed larger than those of HDR. Moreover, material properties of NR distributed along to the depth more straightly than those of HDR. The reason for this tendency is that the compound included in HDR has a role of burrier which protects the material from the heat. It was thought that HDR is more available for long-term usage than NR.