JavaScript must be enabled in order to use this site.
Please enable JavaScript in your browser and refresh the page.
The code recommendations in Section 10.10 of ACI 318 code are related to slenderness effects where flexural deformations govern so they have recommended modifying EI (corresponding to f11 or f22 for shear walls). There is no recommendation about reducing the GA shear. You should, however, note that some of our users use modifiers for f12 also. ACI 318-99 proposed limiting the spacing and removed actually calculating the width and also removed the exposure conditions. For example for beams and one-way slabs s (in) = 540/fs -2.5cc or in other words limiting the fs=0.6fy (For normal structures).
When beam design is done per ACI 318, STAAD will report the moment of inertia of the cracked section at the location where the design is performed. The cracked section properties are calculated in accordance with the equations shown below.
Rectangular Sections
Gross section (A) and cracked transform section (B) for rectangular shapes
Without compression steel
n = EI/Ec
Tee Shaped Sections
Crack Width Calculation As Per Aci 318 14 Online
Gross and cracked transform sections for tee shapes without compression steel
Without compression steel
Crack Width Calculation As Per Aci 318 1400
See D1.F.4.5 Beam Design Output for an example of output including the calculated cracked moment of inertia.
