FLUCTUATING PRESSURE CHARACTERISTICS THAT CAUSE LARGE HORIZONTAL RESPONSE OF A CANTILEVER BRIDGE MODEL IN THE WAKE OF A CONICAL HILL

Abstract

The cause of large horizontal response of a simplified cantilever bridge model in the wake of a conical hill was tried to be clarified. The fluctuating wind velocity and pressure as well as the bridge model response were measured simultaneously. The data were conditionally sampled based on the large horizontal response so that general fluctuating velocity and pressure characteristics that cause the response can be studied. Fluctuating wind velocity and pressure that cause the large horizontal responses are thought to act on the model along a line that is inclined about 40 degrees from perpendicular to the mean flow direction; this corresponds to previous response measurements and flow visualization results. Also the fluctuating pressure distribution with more uniform pattern was clarified to be dominant for the model with wind yaw angle of 40 degrees. Also possible flow pattern that causes the large response was implied by this study, but detail flow and pressure characteristics have to be clarified in further studies.