Civil Engineering Reference
In-Depth Information
pair [ , ¦] so determined are the coordinates at a point on the
curve for
a
, and the slope at the point is equal to
a
.
Step 4:
Calculate the value of
D
from Eqn 10.33. There are three cases to
consider:
(a)
If
D
exceeds zero (i.e. Condition 1), the column is in stable
equilibrium; instability failure would occur at a higher
concrete strain
e
c
(i.e. higher
e
c
/
e
cu
ratio).
Repeat the calculations from Step 1 for a larger value of
e
c
/
e
cu
.
(b)
If
D
is less than zero (i.e. Condition 2), it is impossible for the
column to attain equilibrium; instability failure would occur at
lower concrete strain
e
c
(i.e. lower
e
c
/
e
cu
ratio). Repeat the
calculations from Step 1 for a smaller value of
e
c
/
e
cu
.
Figure 10.18
Equivalent-column methodÏeffective column widths
