Abstract
Recent efforts to codify Direct Displacement-based Seismic Design (DDBD) as an alternative to current force-based (FBD) code approaches are discussed. First, the reasons why the change from a force-based to a displacement-based philosophy is necessary are presented, together with a brief summary of the DDBD procedure. Currently DDBD is generally utilized by compliance with codes that permit design verification by non-linear time history analysis (NTHA). While this is appropriate for important structures it is excessively demanding for routine structures. As a consequence, codification exercises have been undertaken to provide codified DDBD procedures for a number of seismic design codes. This work is on-going, and is briefly outlined in this chapter.KeywordsDesign codesDisplacementDrift limitsForceLimit statesSeismic designStrain limits
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