| Applies To | |||
| Product: | RAM Foundation | ||
| First Affected Version: | 15.04.00 | ||
| Found in Version: | 15.05.00 | ||
| Fixed and Released in Version: | 15.11.* | ||
| Area: | Design | ||
| Issue #: | 721210 |
Problem Description
Moment due to shear is always considered in spread footing design even when that option is turned off in the design criteria.
Reason
In the Foundation module, under Criteria - Design Criteria there is an option to consider the moment due to shear times the footing thickness, for all three footing types.
When the option is turned off, the resultant reaction on a typical braced frame columns is therefore purely vertical, but a larger footing may be designed to resist overturning. Furthermore, the reported soil stress is not uniform, confirming that the foundation is being designed for an overturning moment.
Note, if the option to consider the shear is turned on, the overturning gets even worse (and the foundation gets larger). The moment appears to be double counted in that case.
Note, the load combination forces report indicates the shear force whether the option is turned on or off. In prior versions, the reported shear would have been 0.00 when the option was off. The load combinations report still correctly shows 0.00 for moments when the option is turned off.
Solution
We are working on a fix for this issue for the next release after 15.09.00.18.
