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Code References

ACI 318-14

Definition

Basic Equation

Critical Sections

Calculation of Vc

Shear Area

Mild Reinforced (non-prestressed) Members

Prestressed Members

Calculation of Vs

Required Shear Reinforcement

One way shear capacity is calculated at every analysis point in the member. At each point Eriksson Beam computes either the required area of steel, or checks the provided area of steel against the calculated amount. When comparing a provided amount against required, this is assuming all steel being provided is to be used for shear and is taking torsion into account. The combined effects are taken into account in the combined shear and torsion section.

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Concrete shear strength for mildly reinforced members are computed following ACI 318-14 22.5.5.1.

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Prestressed Members

Concrete shear strength for prestressed members are computed following ACI 318-14 22.5.8.3. This section states the Vc shall be the lesser of Vci and Vcw.

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In the above equation, fpc is the stress at the centroid of the section from all non composite loading.

Shear Area

In the equation above, Eriksson Beam uses a shear area in place of the bd term. The software computes the area of the concrete used in shear above d. This means sections with drafts are more accurately handled when computing shear. The figure below shows the section, in red, being used to compute the shear capacity.

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The strength of the provided transverse reinforcement, when applicable, is computed by summing all of the zones the location overlaps with. Eriksson Beam computes the total transverse provided based on the transverse inputs and use in ACI 318-14 Eq. 22.5.10.5.3.

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Maximum Spacing Requirements

Cross Section Limits

The cross section limits are checking against ACI 318-14 22.5.1.2. If the limits fail and error will be displayed in the analysis report.

Shear Options (show here or in program operation?)

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Exceptions and Notes

References

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