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Tilt Up Response Modification Coefiicient

Tilt Up Response Modification Coefiicient

Tilt Up Response Modification Coefiicient

(OP)
I need some input on the appropriate 'R' value to use in concrete tilt-up design.  Under the 2003 IBC we used R=5.5 for special reinforced conc. shearwalls.  Under the new 2006 IBC & ASCE 7-05, Table 12.2-1 lists intermediate precast concrete shearwalls with an R=4 and special reinf. conc. shearwall with R=5.  My understanding is that some building officials are requiring the use of R=4, however, I feel that and R=5 is justified if the walls are detailed as special.  Any input is appreciated.  Thanks.

RE: Tilt Up Response Modification Coefiicient

(OP)
Thank you.  That was very helpful.

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