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Bridges are the most useful part in the transportation network.Any disruption of the bridge structures may hamper the whole transportation system.In the last recent tsunamis,numerous number of bridges were structurally damaged by the tsunami waves.Lack of proper provisions of tsunami forces in the design guidelines also contributes to the augmentations of the damage level.Therefore,proper evaluation of the tsunami forces on the bridge girder should be introduced in the design promptly.In this study,laboratory experiments were carried out to reveal the damage mechanism of the bridge girder by assessing the exerted tsunami forces.Both broken and unbroken waves were considered for the analysis.The results showed that measured forces were larger for broken waves than those of unbroken waves.Maximum force of the broken waves was 4.59 times as large as the hydrostatic pressure.Also,waves reached the peak value more rapidly for larger wave heights than those of smaller ones.Additionally,a girder that is placed at a higher position is much vulnerable to tsunami hazard.
Bridges are the most useful part in the transportation network. Any disruption of the bridge structures may hamper the whole transportation system. The last recent tsunamis, numerous number of bridges were structurally damaged by the tsunami waves. Back of of provisions provisions of tsunami forces in the design guidelines also contributes to the augmentations of the damage level.Therefore, proper evaluation of the tsunami forces on the bridge girder should be introduced in the design promptly. In this study, laboratory experiments were carried out to reveal the damage mechanism of the bridge girder by assessing the exerted tsunami forces.Both broken and unbroken waves were considered for the analysis. The results showed that measured forces were larger for broken waves than those of unbroken waves. Maximum power of the broken waves was 4.59 times as large as the hydrostatic pressure.Also, waves reached the peak value more rapidly for larger wave heights than those of smaller ones .Additionally, a gir der that is placed at a higher position is much vulnerable to tsunami hazard.