In table 12.3-1 of ASCE 7-05 there are five sections referenced for the type 4 horizontal irregularity (Out-of-Plane Offsets Irregularity). All of the sections referenced are the same as ASCE 7-02 and the source document FEMA 450-1/2003 Edition except section 16.2.2. This section requires that a 3-D mathematical model be created of the structure. Does anyone know the reason that this section was added to ASCE 7-05? I can find no discussion of this requirement, which adds a significant amount of cost/time to the engineering of structures with this horizontal irregularity compared to previous code editions.
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