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I think materials based on IBC2006 will still be sufficient since IBC2009 also refers to the same ASCE 7-05. Two major changes in IBC 2009 I like to point out are: Seismic Design of Wood Structures in IBC2009 refers to NDS/SDPWS 2008 (which can be downloaded free) and Concrete Structure Design refers to ACI 318-08 not ACI 318-05 (pay attention to the chapter 21 in 08, which is quite different in section organization compared to that in 05). But fundamental stuffs are still same. Pretty much you will get the same answers based on either IBC2006 or IBC2009.Sometime I think they refresh the codes so often just to sell the books . They could just release the updates with some supplements.
I think materials based on IBC2006 will still be sufficient since IBC2009 also refers to the same ASCE 7-05. Two major changes in IBC 2009 I like to point out are: Seismic Design of Wood Structures in IBC2009 refers to NDS/SDPWS 2008 (which can be downloaded free) and Concrete Structure Design refers to ACI 318-08 not ACI 318-05 (pay attention to the chapter 21 in 08, which is quite different in section organization compared to that in 05). But fundamental stuffs are still same. Pretty much you will get the same answers based on either IBC2006 or IBC2009.
Sometime I think they refresh the codes so often just to sell the books . They could just release the updates with some supplements.