AISC T value for W shapes?

[JAE]

I just noticed that the value of T (depth of beam less the flange thicknesses less the k values) in the Second Edition LRFD Manual is significantly different from the T values given in the new 3rd Edition.

Does anyone know why these changed? They are quite significant.

 

[Taro]

The change was made to reflect AISC's survey of available shapes. For more info, see the AISC's tech bulletin at

http://www.aisc.org/Template.cfm?Se...ID=17&PressReleaseCategoryID=3&ShowArchives=0

 

[JAE]

Thanks Taro....for a minute I thought I was going crazy. Checking an example problem from the second edition, while using shapes from the third edition I found that a W14x99 T distance changed from 11 1/4" to 10" ....quite a large jump based on a survey.