[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}~of}h/  
engineer has been the effective peak ground acceleration. This number is comparatively <JE-#i  
insignificant in displacement-based or performance-based seismic design, where the key data are TIbqUR  
peak spectral response displacement, and the “corner” period at which this occurs. There appears 77
- Jx`C  
to be a disagreement between seismologists on opposite sides of the Atlantic about these data, 7u]0dHj  
which the structural engineer views with concern, since ductile structural response will often be in ]q DhGt  
this region of the corner period. Dependable information on the reduction of displacement [6Y6{
.%~  
response with damping or ductility is also needed for design approaches utilizing secant stiffness B5>h@p-UV  
characterization. Other areas needing clarification include the issue of how to develop beFVjVVHq  
accelerograms for time-history analysis compatible with the design seismicity using an acceptably oR>o/$z$)g  
small number of accelerograms, and how to reconcile the statistical nature of seismicity ,.tv#j|A  
characterization with the structural engineer’s preference for deterministic analysis. There is some "Zd4e2>{M\  
evidence that a consequence of this is invalid averaging of response characteristics by structural `JyTS~v$  
engineers.