Eriksson Beam calculates the horizontal shear requirements automatically for all composite sections. The horizontal shear calculations are performed follow either ACI 318-14 16.4 or by following the method presented in the PCI Design Handbook 8th Edition Section 5.3.5. The user can select which method to use on the Design Criteria tab of the input.
ACI 318-14 16.4
When using the method in ACI318, the user must specify the surface condition of their member. Once the condition is specified the program will compute Av/s requried or check ɸVnh, whichever is applicable. The calculations Eriksson Beam does is summarized below:
Surface Condition | Av/s Requirement | Check Performed |
|---|---|---|
Roughened w/ Reinforcement | If Vuh ≤ ɸ500bd Av/s computed per ACI 318-14 table 16.4.4.2 If Vuh > ɸ500bd Av/s is computed in accordance with ACI 318-14 22.9 | None |
Roughened w/o Reinforcement | None | Vuh ≤ ɸ80bd |
Smooth w/ Reinforcement | Av Minimum | Vuh ≤ ɸ80bd |
In the above equation b is the contact width and d is the depth to the flexure reinforcement. This does not represent an area, like in the one-way shear equations, but are two individual terms.
PCI Design Handbook 8th Edition, Section 5.3.5
When the user selects the PCI Design Handbook, Eriksson Beam both Vuh and ɸVnh.
Vuh is computed by determining the force in topping that needs to be transferred to the precast section. This force is equal to the area of the topping in compression multiplied by 0.85 times the compression strength of the topping. The area in compression is determined by using the average neutral axis depth on the section.
ɸVnh is computed similarly to the ACI method but with one small change, it replaces the d term with the critical length, as defined in the PCI Design Handbook. When these calculations are done, instead of computing the required steel per foot, it computes the total steel required to transfer horizontal shear. Eriksson Beam then divides this by the critical length to give the average value required.