EARTHQUAKE OBSERVATION RECORD OF THE 2018 NORTHERN OSAKA-FU EARTHQUAKE AND EVALUATION OF RESPONSE OF 10 SPANS CONTINUOUS PRESTRESSED CONCRETE BOX GIRDER BRIDGE

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  • 10径間連続PC箱桁橋における2018年大阪府北部地震の地震観測記録と応答特性の評価

Abstract

<p> In 2018, seismic intensity of 3.0 was observed in the Tarumi district northern Osaka-fu earthquake. During the seismic activity, a behavioral reproduction analysis was held by 6 seismographs installed at six places targeting the Myotani bridge. The aim of this study is to estimate the behavior of nonlinear dynamic analysis model, generally used in earthquake resistance analysis, and to explain the factors that produce the discrepancy between the analysis results and the actual behavior. The study was held by comparing the waveform measured in the bridge (the superstructure, the piers and foundations), and the waveform measured in the ground surface which was used as input earthquake motion. Also, in order to perform the analysis, vibration position in the ground’s input motion and the support conditions of the bridge, were used as parameters in the model. From the testing results, it was possible to understand that the vibration characteristics of the bridge were able to be reproduced, despite the acceleration and the displacement were not equal. However, some problems were found in the modeling of the resistance characteristics of the ground and the bearing conditions, when reproducing the actual behavior of the bridge.</p>

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