Pressure Acting on Underside of Bridge Deck

Pressure acting on a bridge superstructure with a π-shaped and a rectangular cross-sections are measured. The characteristics of the pressure acting on the underside of the bridge deck are investigated. The pressure caused by air compression on the underside of the bridge deck is also discussed. The author shows that the pressure at the landward corner inside the bridge superstructure with the π-shaped cross-section was caused by the air compression. The author also shows that the pressure acting on the seaward point on the underside of the model bridge deck with the π-shaped cross-section was smaller than that acting on the landward point on the underside under just breaking and non-breaking wave conditions.