| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1988: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1987: ¥1,300,000 (Direct Cost: ¥1,300,000)
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| Research Abstract |
Recently, demage of concrete bridge deck slabs has become a serious issue in road maintenance. But a practical method to accurately judge the soundness of slabs has not yet been established. Vibration test is one of the inspection methods to measure the structural soundness. In order to develop the vibration inspection method, the vibration measurements of reinforced concrete slabs were conducted on twe simple supported plate-girders. In this study, we discuss the practical technique about how to conduct the vibration measurement of slabs and how to analyze the vibrational characteristics theoretically. The results are as follows:
In the vidratrion inspection, it is useful to measure simultaneously the vibration at several points of slabs and the impulse excitation method is most useful during the excitation methods of slabs.
In the numerical analysis, the plate analysis by fem is useful and it needs to accurately evaluate the effect of haunch, curd and handrail.
Moreover, the effect of asphalt pavement is discussed. It is necessary to consider the mass of asphalt pavement in vibration of bridge girders, but the effect of asphalt pavement can be ignored in vibration of bridge slads.
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