response modification 9r0 for structural aluminum
 

response modification (r) for structural aluminum
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