(7) Inspect the results of the analyses.

The following is a summary of the peak response parameters

for the structure on both the loose and very compact

gravel.

Loose Gravel:

Maximum rotation of structure = 36.2deg.

Maximum horizontal displacement of foundation =

10.0 in

Ratio of maximum rotation to overturning angle =

0.70

Very Compact Gravel:

Maximum rotation of structure = 20.1deg.

Maximum horizontal displacement of foundation =

3.80 in

Ratio of maximum rotation to overturning angle =

0.39

Inspection of the above tabulation of the results

indicates that, in both analyses, the structure:

(a) Has reached its peak response

(b) Did not overturn

(c) Did not experience excessive horizontal

(sliding) displacements.

Therefore, the design proceeds to the next step.

(8) Inspection of the results (peak rotations) summarized in

Step 7 indicates that no further modifications of the

foundation dimensions for overturning or sliding are

required; therefore, the design can proceed to the next

step.

(9) Determine the location of the critical section for shear.

*ln = 6.50 ft or 78.0 in

TS = 7.81 ft or 94.0 in

Assume 4 inches for the bottom cover and tension

reinforcement:

d = 94.0 - 4.0

= 90.0 in

*ln/d = 78.0/90.0

= 0.87 < 5.0

According to the provisions of paragraph 2.c. of this

section, the foundation is considered a thick section and

the critical section for shear is 0.15 *ln from the face

of the support:

*lcr = 0.15 *ln

= 0.15(78)

= 11.7 inches from the haunch (see Figure 93)

2.08-320