643 コンクリート高架橋の振動解析手法の改良

Abstract

Prediction of structure-borne noise based on an analysis of vibration of structure has been a significant issue for railway viaducts. We have therefore developed a new method of vibration analysis based on a flexural vibration analysis extended to the whole of structure. As the result of the calculation and measurement of the vibration of the floor slab of a concrete viaduct constructed on Shinkansen line, it has been revealed that the developed method has acceptable accuracy. However, the method is a little bit complex because in the method, three layers, namely rail, rail-supporting layer and composite layer composed of the track slab and floor slab are treated as a three layered beam and a property equation of the three layered beam should be solved. In place of that, if each of three layers can be treated as an Euler beam, and only property equation of each beam individually should be solved, the analysis becomes simpler. In this paper, the substituted treatment has been examined and it has been revealed that the difference in accuracy between the solution of three layered model and that of the model in which respective beams are treated individually is substantially small.