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Abstract ▼ AI-Helper

The excessive wind-induced motion of tall buildings most frequently results from vortex shedding induced across-wind oscillations. This form of excitation is most pronounced for relatively flexible, lightweight and lightly damped structure, e.g. super high-rise building This paper discusses the eff...

The excessive wind-induced motion of tall buildings most frequently results from vortex shedding induced across-wind oscillations. This form of excitation is most pronounced for relatively flexible, lightweight and lightly damped structure, e.g. super high-rise building This paper discusses the effective elevation and roof shapes for mitigating the across-wind vortex shedding induced in such situations Emphasis is on the change of the building cross section to design the building with a cutting flat roof surfaces which provide pressure equalization and tend to reduce the effectiveness of across-wind forces by reducing their magnitudes and disrupting their spatial correlation. Wind tunnel test have been carried out at Kumoh National University of Technology using rigid models for twelve kinds of a changing roof shape and three kinds of a square cylinder shape which have aspect ratio of 4, 6 and 8. The measured aerodynamic excitations and displacements for cutting roof models had been compared to those of square cylinder model with respect to the aspect ratio, the roof shape and the cutting ratio to estimate the effectiveness of culling of roof surface for wind-induced oscillations.