JavaScript must be enabled in order to use this site.
Please enable JavaScript in your browser and refresh the page.
ACI 318.2, rather than ACI 318.1? Answer: This is because it was initially planned that ACI 318-11 Chapter 22 on plain concrete would become a separate standard: ACI 318.1. The number was reserved for that purpose. It was later decided to place the contents of ACI 318-11 Chapter 22 in ACI 318-14 Chapter 14. 22 - ACI 318-14 Organization. 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). Crack width calculation is one of the serviceability require. Strong influence on the crack spacing. Gilbert and Nejadi 14. Corresponding to a limiting crack width of 0.41 mm.
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
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.