Alcan Structural Engineering

Biaxial bending

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The effects of biaxial bending may be checked using Expression (5.39), which was first developed by Breslaer.

where

MEdz,y = Design moment in the respective direction including second order effects in a slender column MRdzy = Moment of resistance in the respective direction a = 2 for circular and elliptical sections; refer to Table 5 for rectangular sections

Continues page 41

Figure 9a

Column design chart for rectangular columns d2 /h = 0.05

M/bh fck

M/bh fck

Figure 9b

Column design chart for rectangular columns d2 /h = 0.10

Figure 9b

Column design chart for rectangular columns d2 /h = 0.10

Figure 9c

Column design chart for rectangular columns d2 /h = 0.15

^ As/yk/bhfck

0.05

0.10

0.15

0.20

M/bh fCk

0.25

0.30

0.35

0.40

Figure 9d

Column design chart for rectangular columns d2 /h = 0.20

Figure 9d

Column design chart for rectangular columns d2 /h = 0.20

Figure 9e

Column design chart for rectangular columns d2 /h = 0.25

1.3 1.2 1.1 1.0 0.9 0.8 0.7 2: 0.6 0.5 0.4 0.3 0.2 0.1 0

/ AJyk/bhfck

0.05

0.10

0.15

M/bhhfck

0.20

0.25

0.30

0 0