Allowable Shear Stress

[todd2ny]

I am using an allowable shear stress of .85*2*sqrt(fc) to get allowable shear stress in psi. I noticed that factor changed in the new ACI to .75, but they do allow it in appendix c if you use there load factors. I assume it is ok to use .85 for now. Does anyone have any comments on this?

T.

 

[Taro]

Just be consistent. You can use the higher resistance factors if you use the historically higher ACI load factors (e.g. 1.4D+1.7L). But you must use the lower resistance factors if you use the lower ASCE 7 load factors (e.g. 1.2D+1.6L).

 

[JAE]

I would second what Taro says.