327 Faulty Details

Numerous structural failures have occurred because of the structural arrangement shown in Figure 32.19. The beam (or truss) is continuous over the top of the column. The critical components are: column in compression, compression in the bottom flange of the beam or chord of the truss, and no bottom flange bracing at point a and possibly point b. The sway at the top of the column shown in Sect B-B can result in a K-factor much greater than 2.0. The bottom flange of the beam can possibly provide bracing to the

Compression flange

Joist

FIGURE 32.19 Structural detail with probable instability.

Sect B-B

Girt

- Siding

7k-7k lg lc

In-plane

FIGURE 32.20 Inadequate torsional bracing detail.

Out-of-plane

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