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김재민,이중건 여수대학교 1998 論文集 Vol.13 No.2
This paper presents results of dynamic analysis for a bridge in intersection part of two tunnels subjected to moving vehicle loadings. Since such a bridge system is very unusual due to the fact that it is located in tunnel, the dynamic characteristics of the structure can not be assumed as conventional one. The structure investigated in this study is a reinforced concrete bridge in the intersection part of Namsan Tunnel-1 and Tunnel-2 in Seoul. It is supported by temporary steel structure which shall be constructed during the period of replacing lining in Tunnel-2. Dynamic analysis was carried out for the system using a finite element model constructed by general purpose FE program SAP2000. For this purpose, the structure, lining of tunnels, and surrounding rock were represented bey finite elements, while the rock region is truncated and on its outer boundary viscous dampers were placed to simulate radiation of elastic waves generated in tunnels. Several types of vehicles with various driving velocities were considered in this analysis. The FE model including vehicle loadings was verified by comparing calculated peak particle velocity with the measured one. From the analysis, the impact factor for the bridge was estimated as 0.20. Therefore it has been concluded that the use of upper bound for the impact factor specified in design code is expected to be conservative for this kind of bridge system.