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PREFACE:

The intent of the document is to provide a performance-based approach for seismic design and analysis of tall buildings with predictable and safe performance when subjected to earthquake ground motions. These provisions result in more accurate identification of relevant demands on tall buildings. As such, the application of the procedure contained in this document is expected to result in buildings that effectively and reliably resist earthquake forces. Seismic design of buildings in accordance with these guidelines can offer a number of advantages including:

 •  More reliable attainment of intended seismic performance 

•  Reduced construction cost 

•  Elimination of some code prescriptive design requirements 

•  Accommodation of architectural features that may not otherwise be attainable 

•  Use of innovative structural systems and materials Notwithstanding these potential advantages, engineers contemplating a building design using this document shall give due consideration to the fact that appropriate implementation of these recommendations requires an in-depth understanding of ground shaking hazards, structural materials behavior and nonlinear dynamic structural response.

Appropriate implementation of these procedures requires proficiency in structural and earthquake engineering including knowledge of:

 •  seismic hazard analysis and selection and scaling of ground motions

 •  nonlinear dynamic behavior of structures and foundation systems including construction of mathematical models capable of reliable prediction of such behavior using appropriate software tools

 •  capacity design principles

•  detailing of elements to resist cyclic inelastic demands, and assessment of element strength, deformation and deterioration characteristics under cyclic inelastic loading.