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.
Mildly Reinforced Members
Concrete shear strength for mildly reinforced members are computed following ACI 318-14 22.5.5.1.
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.
Vci
The combined flexure shear strength, Vci, is computed following 22.5.8.3.1
Vcw
The web tension shear strength, Vcw, is computed following 22.5.8.3.2
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.
Transverse Reinforcement Strength
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.
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?)
Options | Description |
---|---|
Treat as slab | |
Limit shear per ACI 318-14 9.4.3.2 | |
Composite Behavior |
Hand Calculation
Exceptions and Notes
References
(still need to add keywords)