| Title |
Influence of Aging of Lead Rubber Bearing on Seismic Performance of Bridges |
| Authors |
박성규(Park, Seong-Kyu) ; 오주(Oh, Ju) |
| DOI |
https://doi.org/10.12652/Ksce.2012.32.2A.109 |
| Keywords |
납고무받침;격리장치;열 노화;내진성능 lead rubber bearing;isolator;thermal aging;seismic performance |
| Abstract |
The dynamic properties of lead rubber bearings, which are used as isolator, are dependent on the main rubber's dynamic behaviors and nonlinear qualities. Rubber materials tend to undergo an aging process under the influence of mechanical or environmental factors, so they can end up inevitably facing damage. A main cause of such aging is known to be oxidization, which occurs through the heat of reaction at high temperatures. Accordingly, in this study an accelerated thermal aging test was carried out in order to compare the characteristic values of the bearings with each other before and after thermal aging occurs. As a result of this experiment, it was found that a thermal aging phenomenon could have an effect on shear stiffness, energy absorption, and equivalent damping coefficients. Furthermore, a decline in the dynamic properties of the lead rubber bearings by means of the thermal aging process was applied to an actual bridge and the effects of such thermal aging on the seismic performance of the bridge were also compared and analyzed based on numerical analysis. As a result of this analysis, it was found that the changes in the basic properties of the lead rubber bearings have a minor effect on the seismic performance of bridges. |