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This is aggravating:
 
97 UBC seismic analysis for a 100' prestressed concrete pole (2' dia. @ bottom, 1' dia. @ top) with  light fixtures at top.
 
Clearly we are dealing with a nonbuilding structure, however... Does section 1634.3 Rigid Structures imply that only rigid nonbuilding structures may be designed under section 1634 ?
 
If the structure is considered flexible, should design then be per section 1634.5 Other Nonbuilding Structures  or would a flexible nonbuilding structure be designed per section 1630.2.1 ?
 
Thanks in advance for your comments.
 
Mark