Elasto-plastic behavior of tall buildings in vortex-induced oscillations

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Recently tall buildings are designed within elasticity for the wind of the 500 years return expectation. In case that the vortex-induced oscillation occurs under stronger wind, it is important to evaluate the structual elasto-plastic stability of a tall building. Structual characteristics should be investigated for wind resistance design. A change of the natural period of the buildings and hysteresis damping have much effect on the aerodynamic forces, so we take the dangerous vibrations of tall buildings into account. The behaviors of the rectangular cylinder in vortex-induced oscillations and unstable oscillations are recorded on VTR.The process of growing vibrating response and the difference between elastic response and elasto-plastic response are investigated. The validity of the simulations is confirmed through the comparison of wind tunnel tests. As a result we understand the elasto-plastic behavior of a tall building in vortex-induced oscillations.