Page Comparison

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Hand Calculation

Exceptions and Notes

1. In the case of single and double tees, when they are simply supported, uniformly loaded, and when they require little or no shear reinforcing as calculated for A_vcw, and approximately 0.04 in²/ft or less of shear reinforcing as calculated for A_vci, the engineer may omit the leg mesh in the middle 80% (+/-) of the span.

2. For the case of hollow core slabs, if the untopped section depth is <= 12.5 in., then no minimum shear steel is required.  If the untopped depth is > 12.5 in., then minimum shear reinforcement is not required where V_u <= 0.5φV_cw.  Currently, the analysis does not take this provision into account.

3. Note that required shear reinforcement does not include any suspension steel that may be required for ledges.   A separate ledge analysis is required.

4. Critical section for shear.  The critical section for shear is based on the depth of the resisting element, and assumes that the loads on the beam (including self-weight) between the critical section and the support go directly into the support without the mechanism of beam action (acting kind of like a small column).  The depth used to calculate the critical section should be based on the cross section used to resist shear.  If there is an applied concentrated load between the critical section and the support, then the critical section is the face of the support.

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