Dynamic torsional behaviour of tall building under wind loads using CFD approach

Abstract

The dynamic torsional behavior of rectangular tall buildings under wind loads has been investigated using wind tunnel tests. It has been found that one of the main factors influencing the dynamic torsional behavior of tall buildings is the dynamic characteristics of the wind such as turbulence and wake excitation. In addition to that, the dynamic characteristics of the building itself influence the torsional behavior. The Ansys CFX10 has been used to analyze the flow over building model with the wind speed profile and turbulence profile generated from AS 1170.2 for the suburban terrain category. Different aspect ratios of rectangular tall buildings have been studies from square to slab type structure. The dynamic torsional moment has been analyzed from pressure distribution on surrounding surfaces of the rigid models of tall buildings. The torsional moments are normalized in coefficient form with the maximum projected width and the maximum projected area of the building. The numerical results are being comparable with the experimental results from Cheung and Melbourne.