[图书馆]SEISMOLOGICAL INFORMATION FOR DISPLACEMENT-BASED DESIGN [复制链接]

With conventional force-based seismic design, the most important information for the structural q'9}Hz  
engineer has been the effective peak ground acceleration. This number is comparatively ?7|6jTIs  
insignificant in displacement-based or performance-based seismic design, where the key data are .$]%gjIBCl  
peak spectral response displacement, and the “corner” period at which this occurs. There appears ~tM+!  
to be a disagreement between seismologists on opposite sides of the Atlantic about these data, u6#FG9W7  
which the structural engineer views with concern, since ductile structural response will often be in %pd-{KR  
this region of the corner period. Dependable information on the reduction of displacement $>*TO1gb+  
response with damping or ductility is also needed for design approaches utilizing secant stiffness @a]O(S>Ub  
characterization. Other areas needing clarification include the issue of how to develop Gm1[PAj  
accelerograms for time-history analysis compatible with the design seismicity using an acceptably 2N/4.  
small number of accelerograms, and how to reconcile the statistical nature of seismicity y/9aI/O'
  
characterization with the structural engineer’s preference for deterministic analysis. There is some 5,~Ju>y*  
evidence that a consequence of this is invalid averaging of response characteristics by structural c|hT\1XR,  
engineers.