[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 Y-WYQ{  
engineer has been the effective peak ground acceleration. This number is comparatively i XI:yE;  
insignificant in displacement-based or performance-based seismic design, where the key data are fw1g;;E  
peak spectral response displacement, and the “corner” period at which this occurs. There appears }Ik{tUS$  
to be a disagreement between seismologists on opposite sides of the Atlantic about these data, [UHDN:y  
which the structural engineer views with concern, since ductile structural response will often be in hOSkxdi*^  
this region of the corner period. Dependable information on the reduction of displacement xFY;aK  
response with damping or ductility is also needed for design approaches utilizing secant stiffness >2l;KVm%  
characterization. Other areas needing clarification include the issue of how to develop v+|N7  
accelerograms for time-history analysis compatible with the design seismicity using an acceptably T+[N-"N  
small number of accelerograms, and how to reconcile the statistical nature of seismicity O2Mo ~}  
characterization with the structural engineer’s preference for deterministic analysis. There is some 5? s$(Lt~  
evidence that a consequence of this is invalid averaging of response characteristics by structural ^KJIT3J(#  
engineers.