Seismic Safety Evaluation System on Concrete Bridges in Urban Area using Seismic Ground Motion Obtained from Fault Model

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The responses of concrete structures effected by a particular earthquake loading highly depend on the exact nature of the seismic wave at the structure location. Hence, when the seismic safety of the structure is evaluated using earthquake response analysis, it is necessary to use the seismic wave at the particular location where the structure is standing. The purpose of this study is to make a seismic safety evaluation system for concrete bridges in urban area using seismic ground motion obtained from the fault model.The following studies were conducted in this research :(1) The computer program of dynamic response analysis using finite element method has been developed. The seismic wave at the locations of damaged concrete bridge piers at Sanyo Shinkansen under South Hyogo earthquake obtained using the fault model was used to analytically simulate the dynamic responses and damages of these structures. The analytical results were compared with the actual damages in these structures. By this method, the seismic wave obtained using the fault model as well as the developed analytical method was examined.(2) The seismic acceleration wave at surface of the footing of six concrete bridges in Nagoya City have been obtained from three kinds of fault models which were made from Tonankai Earthquake, Nobi Earthquake, and Expected Tokai Earthquake. The dynamic behaviors of these six bridges under three kinds of earthquakes were analyzed using the developed program of dynamic response analysis. It was found that two of six bridges would have the large damage at all three kinds of earthquakes because the maximum response displacement exceeded the displacement at the failure. In this way the seismic evaluation system on concrete bridges has been conducted.