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Response Modification (R) for Structural Aluminum

Response Modification (R) for Structural Aluminum

Response Modification (R) for Structural Aluminum

(OP)
I'm reviewing an aluminum bleacher design (low seismic area) and they are using R>3.  Whoa!  So I look at ASCE 7-05 and cannot find any reference to aluminum except for mechanical piping.  I also looked at the aluminum design manual and it references ASCE 7.  I want to say nonbuilding structures per Table 15.4-2 under All other self-supporting structures, tanks, or vessels not
covered above or by reference standards that are
similar to buildings for R=1.25.  Any thoughts?

TIA

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