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This material is copyright - all rights reserved. Reproduced under licence from The Steel Construction Institute on 12/2/2007 To buy a hardcopy version of this document call 01344 872775 or go to http://shop.steelbiz.org/ Steel Designers' Manual - 6th Edition (2003) 206 Other structural applications of steel orientates the building occupants. In common with all aspects of building design, there are a number of design considerations which come into play in the creation of an atrium space. These broad design requirements generate specific technical requirements for the design of the structure. These need to be taken into consideration at the developmental stages to ensure that an elegant design, consistent with all of the technical criteria, can be achieved. The following design issues are common to the design of an atrium space: • Structural form • Type of cladding • Tolerance and deflection • Finishes and detailing • Erection of structure, cladding and fit out • Procurement • Maintenance of the cladding, structure and fit out • Internal and external cleaning • Acoustic performance of the space • Cost • Fire safety of the atrium and surrounding spaces • Provision of heating and cooling to achieve required environmental conditions. The following sections look at some of the technical implications for the structural design and specification imposed by these design issues. 5.5.2 Structural aspects 5.5.2.1 Structural form For a new building there will be significant choice in the types of structural systems that can be adopted, as the perimeter supports can be designed accordingly. Where an enclosure is being added to an existing building, available support will depend on the capabilities of the existing structure and may determine the appropriate options. The structures in Figs 5.36 to 5.40 illustrate a series of solutions in which there is a generally decreasing reliance on the perimeter structure. As a group the arch, the beam and the dome are potentially the most structurally efficient solutions but rely totally on the support provided by the perimeter structure. In the case of an existing building, the following should be considered: • The strength and integrity of the existing structure if this is to be used for support. • The percentage increase in vertical load imposed on the existing structure by the new.This will be smaller where new loads are introduced towards the lower levels of existing walls and columns than at the top.
This material is copyright - all rights reserved. Reproduced under licence from The Steel Construction Institute on 12/2/2007 To buy a hardcopy version of this document call 01344 872775 or go to http://shop.steelbiz.org/ Steel Designers' Manual - 6th Edition (2003) mechanical extraction or natural smoke ventilation in wind suction area mechanical smoke extraction in lieu of fire — resistant glazing in elevations low— level arch gives overall fire— resistant glazing Fig. 5.36 Arch simple profile makes addition of cleaning gantry straightforward low—level roof avoids costs of additional fire safety provisions at high level Fig. 5.37 Beam or truss F thrust from arch resolved into columns and floor, horizontal forces go into wall or perimeter roof diaphragm shear wall additional columns ore more in scale for low option Atria 207
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