LONG-TERM TEMPERATURE MEASUREMENT OF RUBBER BRIDGE BEARING EXPOSED TO SOLAR RADIATION FOR AGING ESTIMATION
| Autor: | Ohkura, Shinya, Paramashanti, Kitane, Yasuo, Itoh, Yoshito |
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| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: | |
| Popis: | Rubber bridge bearings have been used nationwide in Japan after the Hyogo-ken Nanbu earthquake in 1995. The equivalent shear stiffness of a rubber bridge bearing increases due to aging of rubber. It is currently assumed in the long-term performance prediction of rubber bridge bearings that rubber in the bearing has the same temperature as its surrounding ambient temperature because rubber bridge bearings are usually in the shadow as they are installed between the superstructure and the pier. However, in the actual environment, there are many bearings exposed to solar radiation that causes bearing temperature to increase. Since thermal oxidation is one of the major deterioration factors for rubber, temperature has a significant influence on the deterioration process of rubber in a bridge bearing. To accurately estimate a degree of rubber deterioration, the increase of bearing temperature due to solar radiation is necessary to be evaluated. To understand the solar radiation effect on long-term performance of rubber bridge bearing, internal bearing temperature, external bearing temperature, and global solar radiation were measured for one year for a bearing installed in outside environments in this study. Based on the measured data, an empirical relationship between solar radiation and the internal bearing temperature was obtained. In addition, the long-term increase of the equivalent shear stiffness of a rubber bridge bearing due to aging was estimated by including solar radiation effect on bearing temperature. The difference of 3% in the change of equivalent shear stiffness was found whether or not the effect of solar radiation was included. 4th International Conference on Advances in Experimental Structural Engineering, Ispra, Lombardy, Italy, June 29-30, 2011 |
| Databáze: | OpenAIRE |
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