Analysis, Design & Performance
343276 - Comprehensive Systematic Tall Building Wind Design
Friday, April 20
3:30 PM - 5:00 PM
Due to the complexity and case-sensitivity in testing and design, tall building wind studies have been performed on a project-by-project basis, heavily relying on wind tunnel testing. This paper addresses comprehensive, up-to-date methods for tall building wind design, focused on developing systematic approaches for main wind design components. The advanced issues in tall building wind design addressed in this paper include aerodynamic damping due to vortex-shedding, secondary mode effects, and the effect of supplemental damping such as tuned mass dampers (TMD) or tuned liquid sloshing dampers (TLSD) in reducing wind induced vibrations. This paper introduces a new systematic approach to wind tunnel measurements of building aerodynamic damping based on generalized aerodynamic damping forces, which allows results to be applied to different structural properties without additional tests. Secondary mode effects on slender buildings will also be investigated based on pressure integration measurements, in comparison to the conventional approach utilizing only a single vibration mode in each direction. The secondary mode effects to the damper design will also be addressed, which has been raised as an issue for slender buildings. Supplemental damping systems, including TMD and TLSD, will be compared in terms of required space and efficiency for their application to serviceability design and performance-based design. As an example, a real-life building with 100 stories and a building slenderness ratio of 15 is analyzed. The example introduces new free-vibration motion-induced aerodynamic damping measurements, secondary mode pressure integration testing, and a parametric study on supplemental damping systems including TMD. This paper will provide structural engineers, tall building developers, and researchers with up-to-date information on tall building wind design focused on systematic approaches and aid in the search for economical building dampening solutions.