Unified design method for seismic resistance of braced steel frames

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Current seismic design standards, such as NBCC 2005, are based on the concept of the performance-based design. The principle of the performance-based seismic design is to make sure that a structure can perform in a desired manner under various intensities of earthquake. According to the procedure of the performance-based design, single or multiple performance objectives are selected in the conceptual design phase. Then, the target performance is described in accordance with the considered parameters, which can be force-related or deformation-related parameters. Acceptable limits of these parameters with respect to each level of seismic hazard are quantified. In the conceptual design step, layout of the structure is determined. One important issue in this step is to determine the yielding mechanism of a suitable structural system with appropriate energy dissipation elements (EDEs).