Page 356 - Structural Steel Designers Handbook AISC, AASHTO, AISI, ASTM, and ASCE-07 Design Standards

Brockenbrough_Ch08.qxd 9/29/05 5:21 PM Page 8.10

LATERAL-FORCE DESIGN

8.10 CHAPTER EIGHT

and

S D1 = 2 S M1 (8.10b)
3
The coefficient R in Eq. (8.7) reduces the seismic design forces in recognition of the ductility
achieved by the structural system during a major earthquake. A measure of the ductility and inelastic

FIGURE 8.5 Typical configurations of eccentric braced frames. See also
Fig. 8.15.

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