Performance-Based Wind Design of Tall Buildings Considering Corner Modification and Inelastic Behavior

• Published in: Journal of structural engineering (New York, N.Y.) N.Y.), 2024-07, Vol.150 (7)
• Main Authors: Alinejad, Hamidreza, Ahn, Byeonguk, Kang, Thomas H.-K.
• Format: Article
• Language: English
• Subjects: Case Studies; Case Study; Chamfering; Corners; Design; Design factors; Performance assessment; Performance evaluation; Tall buildings; Wind effects; Wind engineering; Wind loads; Wind tunnel testing
• ISSN: 0733-9445; 1943-541X
• DOI: 10.1061/JSENDH.STENG-13100

AbstractDesign for wind-induced response is one of the critical factors for the design of tall buildings. Aerodynamic treatments such as corner modifications are among the traditional passive solutions for the reduction of wind-induced effects. Another practical solution is the permission of inelastic behavior under extreme wind load to reduce the resonant component of wind load. This approach has received more attention recently in performance-based wind design (PBWD) as an alternative approach for wind design. Moreover, inelastic wind design using a proper wind load reduction factor can significantly facilitate the initial design and makes PBWD more practical. In this study, the efficiency of aerodynamic modification and permission of inelastic behavior in the reduction of wind load and material cost was compared in detail. Three case study buildings with a square-shaped plan and 160 m height were considered, where one building has sharp corners and the others have chamfered and recessed corners as aerodynamic treatment. RC core walls with perimeter moment frames were considered as the structural system of all buildings, and they were designed based on wind load reduction factors of 1 (elastic design) and 2 (inelastic design). Then, the performance of buildings was evaluated according to ASCE prestandard procedure by performing linear and nonlinear time-history analysis using wind load obtained from wind tunnel tests. The results showed that inelastic wind design can be more effective than corner modification in the reduction of wind load; however, the design reinforcement ratio is less and more similar due to minimum requirement. Performance assessment of the building confirmed the adequacy of designed buildings and showed that the inelastic system has acceptable behavior, and there is a large margin of safety against failure for the inelastic building.