Abstract
Since structure-borne noise is generated by vibration of members of the structure, it is demanded to reduce the vibration and noise around the railway viaducts. To develop a countermeasure to reduce the vibration and noise effectively, it is necessary to predict them based on the analysis for the mechanism of them. We have therefore developed a new method of vibration analysis based on a flexural vibration analysis extended to the whole of structure, and a method to calculate the structure-borne noise by using the solution given by the vibration analysis as above mentioned. As the result of the calculation and measurement of the noise near the floor slab of a concrete viaduct constructed on Shinkansen line, it was revealed that the developed method has an acceptable accuracy. Then, we tried to evaluate the effect of two representative countermeasures to reduce the structure-borne noise, one is to apply an elastically supporting system, and the other is to modify the specification of floor slab by the developed analysis method, and revealed the effects of them quantitatively.
