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This page is devoted to frequently asked questions (FAQ) related to Design in SAFE. |
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Why do my punching-shear results differ from hand calculations?
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- For corner columns in models prior to SAFE 2014 v14.1.0, results should differ from ACI and PCA formulation because SAFE incorporates the I23 moment-of-inertia term. Beginning with SAFE v14.1.0, an enhancement has been made to the punching shear check of corner columns for all codes that consider linear elastic shear distribution along the punching perimeter to exclude the effect of the cross moment of inertia, I23. The inclusion of I23 for corner columns was making the checks overly conservative compared to experimental results. See also references 2 and 3 at the end of the page for additional information.
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| *Related Incident:* * {incident:no=47831|comment=Discrepancy between punching shear values reported by program and hand calcs} |
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- Drop objects may be converted into slab objects such that punching is only checked for columns through slab.
- Drop objects connecting to multiple columns may be divided into individual segments centered over each column.
See Also References:
1- Verification examples of punching-shear calculations per various building codes are available within SAFE through Help > Documentation.
2- MacGregor's "Reinforced Concrete Mechanics and Design-Fourth Edition". The underlined sentences explain why ACI 318 Code does not accept equations which include Ixy.
3- "PTI Manual-Fifth Edition". This page shows punching shear equations for corner columns without Ixy.