Wind-driven oscillation and dynamic response of a Y-plan shaped tall building under interference

Abstract

This study explores the wind-driven oscillation of the Y-plan shaped tall building by utilizing unsteady Computational Fluid Dynamics (CFD) in conjunction with structural modal analysis. Because tall structures are so near to one another, wind-driven interference effects between buildings have recently gained significant attention in structural engineering for modern cities. This study examines the wind-driven oscillation and dynamic response on a stiff-scale Y-shaped tall structure due to square plan shaped interfering structure placed in close proximity. Wind speed of 50 m/s at 0°and 180° wind incidence angles are taken into consideration while validating and comparing the along and across-wind induced dynamic responses of the building models. Using the finite volume approach, the fluid flow domain is divided into a finite number of small control volumes or components for numerical analysis. Governing equations of fluid flow, such as the Navier-Stokes equations, are then solved numerically over these discrete elements. This involves iterative algorithms to approximate the solutions of these partial differential equations under specified boundary conditions and initial conditions. Using the k-epsilon turbulence model, the unsteady findings were verified against wind tunnel test data. When wind blows perpendicular to the building model's main axis, crosswind vortices can cause the model to undergo considerable aeroelastic effects that can lead to a strong resonance. As a building’s height increases, both along-wind and across-wind forces generally increase due to higher wind speeds and more pronounced aerodynamic effects. The overturning moment in a building increases with height due to the lever arm effect of lateral forces. A comparison and discussion of pressure distribution, forces, moment are conducted on the four distinct models. Furthermore, by designing tall buildings that are less susceptible to wind load and result in more occupant-friendly and energy-efficient cities, urban sustainability can be enhanced with an understanding of wind-induced response. At the end, a research roadmap is presented for this subject.