New approaches to seismic design of steel framed buildings

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The majority of the international seismic design provisions, including the National Building Code of Canada (2005), employ the principles of capacity design to obtain structures capable of withstanding seismic solicitations. Although the main design objectives are usually achieved using this approach, the method presents several intrinsic inconsistencies. For instance, the procedures used to predict design values of displacements and deformations are not transparent and rely on somewhat artificial rules which fail to reflect the complex interactions that exist in actual structures. For certain structural systems, this can result in an important increase of structural mass without significantly improving the seismic behaviour.