416 Seismic Design

Special provisions (AISC 2002) apply for the design of steel structures to withstand earthquake loading. To ensure sufficient ductility, more stringent limiting width-thickness ratios than those shown in Table 4.8 for compression elements are required. These seismic limiting width thickness ratios are shown in Table 4.21.

TABLE 4.21 Seismic Limiting Width-Thickness Ratios for Compression Elements

Component element

Width-thickness ratio"

Limiting value", 1p

Flanges of I-shaped rolled, hybrid, or

b/t

0.30P(£/Fy)

welded beams, columns (in SMF

0 0

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