(Solved): 13.6 and 13.7SOLVE THESE TWO QUESTIONS.ONLY FOLLOW BOOK CHAPTER 13 Structural Concrete Theory and ...

13.6 Design a rectangular combined footing to support the two columns shown in Fig. 13.28. The center of the exterior column is $1\mathrm{ft}$ away from the property line and $14\mathrm{ft}$ from the center of the interior column. The exterior column is square with 18 -in. sides, is reinforced with no. 8 bars, and carries an axial dead load of $160\mathrm{K}$ and a live load of $140\mathrm{K}$. The interior column is square with 20-in. sides, is reinforced with no. 9 bars, and carries an axial dead load of $240\mathrm{K}$ and a live load of $150\mathrm{K}$. The bottom of the footing is $5\mathrm{ft}$ below final grade. Use $f_c^{?}=4\mathrm{ksi},f_y=60\mathrm{ksi}$, and an allowable soil pressure of $5\mathrm{ksf}$. 13.7 Determine the footing areas required for a balanced footing design (equal settlement approach) if the usual load is $25\%$ for all footings. The allowable soil pressure is $5\mathrm{ksi}$ and the dead and live loads are given in Table 13.3. Figure 13.28 Problem 13.6. Table 13.3 Problem 13.7