Civil Engineering Reference
In-Depth Information
Earth
connection
point
C
B
D
Electric
potential
point
Electric
potential
point
140
60
60
140
(a)
Loading
point
A
C
E
Support
pressure
point
Support
pressure
point
50
150
150
50
(b)
4.6
Comparison of loading boundary conditions between electric and
force fi elds: (a) model of the electric fi eld, (b) model of the force fi eld.
4.4.2 Relationship between strain and FCR
(Self-diagnosing of strain)
Figures 4.9-4.12 illustrate the relationship between FCR and the strain of
IGNA (
ε
2
) in concrete beams. The effects of various conductive admixtures
on these relationships can be also observed. It may be seen that the rela-
tionship between the FCR and the strain of IGNA corresponds well with
the First Order Exponential Decay function, which may be expressed by:
(
)
Ym
=
exp
−
Xnp
+
[4.4]
where
m
,
n
and
p
are constant parameters corresponding to the type and
amount of the electric conductive phase and the variable
X
is the strain of
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