Abstract
The effects of partial fairings on reducing hydrodynamic forces on bridges during tsunami or flood were studied. Covering the entire sides with fairings is difficult under some circumstances, especially at the bridge ends because of the complexity of the work required. Therefore, this study conducted hydraulic experiments and numerical simulations to determine an effective fairing-covering ratio. The results show that fairings are effective to reduce drag, but have limited effect on reducing lift depending on the wave height. Further, fairings that cover more than half the width of the bridge can reduce drag and lift, and a fairing that covers 75% of the width of a bridge model exhibits a similar reduction as a full width fairing. However, a 25% width fairing results in a low reduction in tsunami-induced forces.
