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Structural Concrete - Hassoun

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17.8 Analysis of Two-Way Slabs by the Direct Design Method 647<br />

Example 17.4<br />

Using the direct design method, design an exterior flat-plate panel that has the same dimensions, loads,<br />

and concrete and steel strengths given in Example 17.3. No beams are used along the edges (Fig. 17.21).<br />

Solution<br />

1. Determine the minimum slab thickness using Table 17.1 for flat plates. From Example 17.1, a<br />

9.0-in. slab thickness is adopted.<br />

2. Calculate factored loads: W u = 330 psf. (See Example 17.3.)<br />

3. Check one- and two-way shear (refer to Example 17.3 and Fig. 17.19).<br />

a. Check punching shear at an interior column: V u = 156.7

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