Architecturally Exposed Structural Steel: Clear Communications for a Better Project

AESS sits squarely at the juncture between architecture and engineering. Of the many structural materials used for larger, non-residential buildings, it is the one that requires the highest level of technical knowledge from the architect and the highest level of design appreciation from the engineer. The fabricator is often caught in the middle, attempting to create steel that is simultaneously correct for aesthetic and stability requirements. In some instances AESS can be priced out of a project because the finish expectations have been placed too high - for the budget or the type of project. This paper will speak to new standards that have been developed by the Canadian Institute for Steel Construction (CISC) for the design and specification of AESS that are centered around a "Matrix" that classifies AESS according to factors that include visibility, fit, finish and form. The paper looks at design for constructability as this affects the ability of the fabricator/erector to deliver the project on time and on budget. Also addressed will be issues arising from the recent influence of 3D modeling software on the generation of buildings that are more easily rendered than fabricated. This would include projects that use curved steel and non-rectilinear forms. New detailing software is discussed that greatly assists with bringing some highly challenging projects to reality.