Architect and Builder Magazine South Africa Dec 2017 / Jan 2018 - Page 48

required the introduction of significant seismic lateral ‘stiffening’. The optimal structural solution engineered by Sutherland primarily incorporated a new central, reinforced concrete core (to also accommodate lifts and services) constructed up to the full height, tied in at each floor and anchored into the bedrock below, beneath the sea level. To construct this new core, the central part of the existing building, including a maze of 30 concrete rectangular storage bins on the lower floors, needed to be demolished and the building supported laterally against wind loads by means of a temporary steel bracing system for a considerable time until the new core was completed. Construction sequencing throughout was of critical importance. Mechanical Engineering Arup’s mechanical team provided international best practice design to deliver precise environmental control to the museum to enable loans from 48 international art institutions. The design placed emphasis on energy efficiency to reduce power consumption and the buildings demand on municipal infrastructure. Using a two stage environ- mental control, a single system is dedicated to filtering and purifying the outside air, and multiple smaller systems are dedicated to conditioning each gallery space. The galleries are a mixture of ASHRAE Class A, B & C types of environmental control, with Class A being the highest level. The cooling and heating requirements of the glazed pillows were carefully analysed with computational fluid dynamics to make sure hotel guests remain comfortable all year round without an excessive burden on the environment and without reducing access to natural daylight and views. The faceted nature of the façade helped reduce instantaneous heat gain to the space. All heating and cooling for the building is provided by the ɥЁ͕݅ѕȁЁݥѠ)Ё ɥȁ̸)i5