EFFECT OF CORNER-CUT AND TAPERING ON ACROSS-WIND AERODYNAMIC DAMPING OF SQUARE HIGH-RISE BUILDINGS

In order to study the effects of chamfered, slotted, and tapered cross-sections on across-wind aerodynamic damping ratio of super-high-rise building, 10 aeroelastic model tests were conducted in the TJ-1 wind tunnel at Tongji University. The random decrement technique was used to evaluate across-wind aerodynamic damping ratios. The accuracy of the evaluated results was verified through comparison with previous research achievements. Results indicated that modifications of cross-sections are not always effective in suppressing the aerodynamic effects of tall buildings. Chamfer ratios from 5% to 20%, slot ratios from 5% to 10%, and taper ratio of 1% significantly decrease the magnitudes of absolute aerodynamic damping ratios. Slot ratio of 20%, and taper ratios from 3% to 5% increase wind-induced responses through changing the aerodynamic damping ratios. Based on the findings, empirical aerodynamic damping function parameters are fitted for aerodynamic damping ratios of high-rise buildings with aerodynamically modified square cross-sections at low reduced wind velocities.