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IMO, you must check & verify your design through manual calculations. Following links provide procedure and examples, for designing of strap footings manually: 1. Strap Footing- Shallow Foundations.pdf 2. Special Footings and Beams on Elastic Foundations.pdf 3. Strap Footing Design.pdf Regards.

Although bottom levels of the strap and the two connected footings are generally not the same, and strap bottom level is a bit higher than the bottom face of the footings, the strap beam has to be cast monolithic with the footings. For further clarification, please see Example 16.4 (especially the last paragraph) related to the design of a strap footing according to ACI 318, at the following link http://www.chegg.com/homework-help/complete-design-strap-footing-example-164-determine-dimensio-chapter-16-problem-6p-solution-9780073293493-exc?adobe_reloaded=true:

The reinforcement is given in Av/s (in2/ft) in my case. I use the formula Ab / (Av/s) x12 = spacing in inches. Ab = area of stirrup bar x no; of legs