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At 12:45 PM 1/20/98 +0800, you wrote:
>We are designing a new 5 level airport in Manila, 188,000 m2.  The type
>of construction is concrete flat plate slab with drop panels.  We are
>using SAP2000 to analyze the structure.  After we perform the analysis
>and get the seismic forces from the response spectra analysis, should we
>apply an IDR to reduce the forces before we compare them with the
>capacity of the elements, or should we compare the d/c ratio to a
>acceptable factor for the type of structure.  
>Or in another case should we follow the UBC and just scale the results
>from the dynamic analysis.
>Thank you
>Best regards,
>Tom Long
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