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If this option is selected then the stiffness of the haunches (if any) are incorporated into the structural model at the top and bottom of the exterior walls. This will cause a redistribution of the wall moments mid-height to the top and bottom of the walls.
Critical Sections:
Consider Haunches
Select this option to have haunches considered in the selection of the location of the critical section. If haunches are specified and this is checked then the program will design the member using moment and shear values beyond the face of support in accordance with whether or not the user has selected to extend the critical section (see below). If this is not checked then the program will design the member using moment values at the face of the intersecting members and shear values at the dv (or d for STND) from the face of the intersecting members regardless of the specified haunch lengths. This will provide a more conservative design.
Extend Critical Sections
If haunches are specified and this option is checked then the program will position the critical section for shear at a distance of dv(d) beyond the end of the haunch. If left unchecked, then the critical section for shear will be placed at a distance of dv(d) from the face of the intersecting member. For flexure, if this option is selected, then the critical section is located at the intersection of the haunch and the constant depth member (basically the end of the haunch). If unchecked, then the critical section for flexure is taken at the point at which the depth of the slab plus haunch is 1.5 times the depth of the slab.
Note that if this option is selected, the user is assuming that the face of support is located at the end of the haunch. This extension will only be applied to haunches that form an angle of less than 45 degrees to the supporting faceCritical Section Locations
The following options for critical section locations are given:
Flexure Critical Section Locations
Face of support
1.5 * depth of slab (this is the location where the depth of the slab + haunch equals 1.5 * depth of slab)
End of haunch
Shear Critical Section Locations
Face of support
dv beyond support
End of haunch
dv beyond haunch
Include Haunch Depth
You have the option in include haunch depth for all critical sections, no critical sections, or only flexure/shear critical sections. This will add the depth of the haunch to ds and dv, which can also effect the shear critical section locations.
Use Max Moment with Max Shear
The shear analysis will either use the maximum moment or the corresponding moment. If checked, the maximum moment at the face of the wall will be used in the interaction between Vu and Mu to calculate the shear capacity of the member. If unchecked, the moment at the critical section for shear will be used instead.
Use Haunches for Flexure and Shear
By default the haunch is only used to position the critical section, although the haunch may also be used to stiffen the corners of the structural model. By selecting this option, the user may also direct the program to use the haunches in the calculation of the flexural and shear resistance.
Flexure:
Use Eq. 12.10.4.2.4a-1
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