Civil Engineering Reference
In-Depth Information
Maximum principal stress criterion
Nadal compression criterion
Figure 7.8.
Failure and loading domains in the main stress plane
For the traction domain (pure traction or compression-traction), the failure area
is expressed as follows:
f
f
0,
V
0 and/or
V
!
0
[7.12]
trac
t
c
1
2
where:
2
J
2
2
V
I
/3 and
W
V
[7.13]
oct
1
oct
eq
3
9
e
V
is the Von Mises equivalent stress:
E
1
2
E
a
2
,
b
and
E
f
/
f
[7.14]
c
c
c c
c
21 3 21
E
E
where:
-
t
f
= concrete strength in uniaxial traction;
'
f
= concrete strength in uniaxial compression;
'
-
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