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where

LRktB LRktB

+ LRktA

LRktA

1 + EtISiA

ERktA/

ERkffi/

L / RktARktB

where R^tA, RktB are tangent stiffnesses of connections A and B, respectively, S;i, Sj are generalized stability functions, and S|, Sj are modified stability functions that account for the presence of end connections. The tangent stiffness (RktA, RktB) accounts for the different types of semirigid connections (see Equation 5.8).

TABLE 5.3 Empirical Equations for Shape Parameter n

Connection type n

Single web-angle connection Double web-angle connection Top- and seat-angle connection

Top- and seat-angle connection with double web angle

0.695 for log10 00 5 -3.073

0.573 for log10 00 5 -2.582

0.302 for log10 00 5 -2.880

0.827 for log10 00 5 -2.721

Source: From Kishi, N., Goto, Y., Chen, W.F., and Matsuoka, K.G. 1993. Eng. J., AISC, pp. 90-107. With permission.

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