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S. Fujisawa, Y. Yamaguchi, S. Yotsui, Y. Satofuka, K. Izuno , "Numerical Analysis of Truss Bridge Subjected to Earthquake and Flood", in B.H.V. Topping, J. Kruis, (Editors), "Proceedings of the Fourteenth International Conference on Computational Structures Technology", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 3, Paper 12.5, 2022, doi:10.4203/ccc.3.12.5

Keywords: earthquake damage, bridge hydraulics, flash flood, numerical simulation, truss bridge, bridge bearing.

Abstract

Although damage of bridges due to the shaking of earthquakes has been reduced these days, the safety of bridges against multi-hazards must be improved to protect human life. This paper discussed the safety measures of the Nishize Bridge as an example of the bridge suffered both a large earthquake and a flood. First, the earthquake response during the 2016 Kumamoto Earthquake was evaluated. During the Kumamoto Earthquake, the maximum force acted on the fixed bearing, which is larger than the estimated strength from the design specification at the time of construction. However, the root mean square value of the reaction force was small, which resulted in no damage during the earthquake. Second, the hydrodynamic force due to the 2020 flood was calculated using the one-dimensional analysis of riverbed variation. The drag was larger than the estimated bearing strength for more than 3 hours, and consequently the Nishize Bridge was washed away by the excessive drag. The maximum value of drag is smaller than the value of bearing strength required by the current design specification, which suggests that strengthening of the bearings to satisfy the current seismic design specification is an effective measure against not only earthquakes but flooding.

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Front Page Browse CCC CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Conferences ISSN 2753-3239 CCC: 3 PROCEEDINGS OF THE FOURTEENTH INTERNATIONAL CONFERENCE ON COMPUTATIONAL STRUCTURES TECHNOLOGY Edited by: B.H.V. Topping and J. Kruis Paper 12.5 Numerical Analysis of Truss Bridge Subjected to Earthquake and Flood S. Fujisawa, Y. Yamaguchi, S. Yotsui, Y. Satofuka and K. Izuno Civil and Environmental Engineering, Ritsumeikan University, Shiga, Japan doi:10.4203/ccc.3.12.5 Full Bibliographic Reference for this paper S. Fujisawa, Y. Yamaguchi, S. Yotsui, Y. Satofuka, K. Izuno , "Numerical Analysis of Truss Bridge Subjected to Earthquake and Flood", in B.H.V. Topping, J. Kruis, (Editors), "Proceedings of the Fourteenth International Conference on Computational Structures Technology", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 3, Paper 12.5, 2022, doi:10.4203/ccc.3.12.5 Keywords: earthquake damage, bridge hydraulics, flash flood, numerical simulation, truss bridge, bridge bearing. Abstract Although damage of bridges due to the shaking of earthquakes has been reduced these days, the safety of bridges against multi-hazards must be improved to protect human life. This paper discussed the safety measures of the Nishize Bridge as an example of the bridge suffered both a large earthquake and a flood. First, the earthquake response during the 2016 Kumamoto Earthquake was evaluated. During the Kumamoto Earthquake, the maximum force acted on the fixed bearing, which is larger than the estimated strength from the design specification at the time of construction. However, the root mean square value of the reaction force was small, which resulted in no damage during the earthquake. Second, the hydrodynamic force due to the 2020 flood was calculated using the one-dimensional analysis of riverbed variation. The drag was larger than the estimated bearing strength for more than 3 hours, and consequently the Nishize Bridge was washed away by the excessive drag. The maximum value of drag is smaller than the value of bearing strength required by the current design specification, which suggests that strengthening of the bearings to satisfy the current seismic design specification is an effective measure against not only earthquakes but flooding. download the full-text of this paper (PDF, 6 pages, 521 Kb) go to the previous paper go to the next paper return to the table of contents return to the volume description
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