APPLICATION OF A NEW WIND TURBULENCE MODEL IN PREDICTING MOTION STABILITY OF WIND-EXCITED LONG-SPAN BRIDGES

A new mathematical model for wind turbulence is presented herein for t he analysis of motion stability of wind-excited long-span bridges. The new model has a finite mean-square value, and is capable of matching closely an arbitrary spectral density, such as the von-Karman, Dryden or other well-known spectra in the literature. It is shown that the pr esence of turbulence changes the composition of the combined fluid-str uctural mode, and that, under favorable energy interchange conditions, it can stabilize even a single-degree-of-freedom structural motion.