国外基于位移的抗震设计

The conceptual basis of the spectral acceleration-based design method currently used in seismic codes is reviewed and its limi- tions are discussed. An alternative method that uses displacements as the basis for the design procedure is then presented. Its nceptual basis for elastic and inelastic seismic design and its application to single-degree-of-freedom and multi-degree-of-freedom ructures are reviewed. The effects of torsion are considered. The advantages of this method over the spectral acceleration-based sign method are also discussed. To the authors’ knowledge, this and the accompanying paper mark the first application of the splacement-based procedure to the seismic design of (steel) buildings.  1999 Elsevier Science Ltd. All rights reserved.