Quantcast Figure 40. Concrete Column Section

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(3) Use an 18- x 18-inch column section with twelve No. 7
reinforcing bars (see Figure 40).
(4) Radius of gyration for rectangular section is equal to 0.3
of depth.
rx = ry = 0.3 x 18
= 5.4 in
From paragraph 4.c(2)(b),
k = 0.9
kL
0.9 x 120
= = 20 < 22
O.K.
r
5.4
(5) Minimum eccentricity in both directions,





 


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