TASUKU KINUGAWA
A Study on the Use of Expansion Device for Bridge Monitoring.
TAKESHI MIYASHITA
In Japan, the number of deteriorated bridges has increase remarkably in recent years and, according to reports, this number is expected to increase even more in the near future. Therefore, an appropriate bridge management system is desired.
Additional to aging, there are many other factors that contribute to structures¡Ç deterioration. Among these factors, bridge¡Çs overloading is one of the most common one. In order to develop the desired bridge management system, the acting load in the bridge must be grasp. Bridge-Weigh-In-Motion (BWIM) system has already been used since long time ago for different purposes. However, examples of its application on expansions devices are still scarce.
The aim in this study is to develop a method to measure vehicle¡Çs weight on-site. By developing this method, it is thought that there will be many benefits in the bridge management field. For example, the loading weight can be determined regardless member¡Çs materials. Moreover, it is possible to predict bridge deterioration by using the expansion device.Two response test are conducted to obtain expansion devices response. First, a calibration test using a test vehicle is conducted. This test indicates the relationship between response and loading weight. After this, the expansion devices¡Ç response is measured for free flow traffic test.
The obtained results can be summarized as follows.
a) Based on the calibration test, there is a relationship between expansion devices¡Ç response and loading weight.
b) Using expansion devices¡Ç response, the vehicle weight can be estimated within an error ¡Þ10%. For axle weight, it can be estimated within an error between ¡Þ20-30%.
c) From free flow traffic measurements, it was found that the driving position and highly fatigue-damaged areas can be determined using expansion devices¡Ç response.
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