SEAOC Vol III amplified story drift

[McEngr]

Can someone please verify that the Cd factor on page 17 of the SEAOC vol iii is not 4.3 and should be 5? This should be a really quick and easy check. Thanks!

 

[sab35263]

Can someone please verify that the Cd factor on page 17 of the SEAOC vol iii is not 4.3 and should be 5? This should be a really quick and easy check. Thanks!

On Page 6,the manual states that Cd = 5. I'm not sure why SEAOC uses ~ 4.3 in the calculation of Design Story Drift. The way I learned it was to get the Cd value from ASCE 7-05 table 12-2.1, and under B-3 the Cd value is 5 for special concentric Braced Steel Frames.

 

[tws]

I agree Cd = 5. It seems they are using a I = 1.15 for this calc, although it is given I = 1.0.

 

[jillhill]

anyone know if they have a 2009 version?