Adventures in architectural aerodynamics

Abstract

This paper presents the results of a series of wind engineering studies, including high-frequency force balance boundary-layer wind tunnel tests conducted to assess the wind effects relevant to the structural and serviceability design of a proposed 400+ m high-rise scheme in the Middle East. The development of the architectural scheme allowed the design team to explore different levels of porosity for the façade of the building over the top third of the structure. The primary aim of these studies was to optimise the building design, minimising the overall dynamic structural wind loading and wind-induced accelerations. Details of the structural lateral-stability system employed in the design and key considerations on the potential use of alternative devices are given. A detailed comparison of the wind-induced structural response for a nominally sealed scheme – taking into account the contribution of additional damping – against the benefits arising from the employment of a permeable solution is presented. The technical challenges are illustrated from both a structural and cladding design viewpoint – the latter being related to the use of a porous skin over the architectural feature at the top of the tower. A brief description of the planned next phase of wind engineering work – aimed to assess the overall wind loading applicable to the design of the porous envelope as well as the potential for wind-induced noise and vibration of its elements to occur – is also given.