FIGURE 31.16 A leaning column frame: (a) frame dimension and loads and (b) frame subjected to fictitious lateral loads.

ATSC Load and Resistance Factor Design Method Using Equation 31.102 for column AB

Lwi Method

1. Apply a small lateral force H = 1 kip as shown in Figure 31.16b.

2. Perform a first-order analysis and find D1 = 0.687in. (17.45 mm).

3. Calculate z factors from Equation 31.96.

Since column CD buckles in a single curvature, m =—1,

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