Advances in Tall Building Design under Strong Winds

摘要

New formulas are derived for dynamic analysis of tall slender buildings with large aspect ratio (slenderness ratio) coupled with tuned-liquid sloshing dampers under strong across-wind vortex-induced vibration in consideration of motion-induced aerodynamic damping and stiffness. A tuned-liquid sloshing damper installed at the top of a building is modeled as an equivalent linear mechanical device coupled with building structure; the frequency-dependent aerodynamic damping and stiffness are represented as constant coefficient matrices for the time-domain analysis. Tall slender buildings with aspect ratios exceeding 10 and building heights close to 300m are analyzed to verify the method. Across-wind base moments based on the code and wind tunnel measurement are used in the examples. The effects of the aerodynamic damping and tuned-liquid sloshing dampers are also discussed in the examples.