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do not overlap. As it can be observed, there are not signi
cant differences between
the several f
R3
values. There are not differences in SM between MC2010 and
RILEM but only signi
cant differences between the EHE08 and the other two
Codes. In this test Series, Codes are safer; in fact, as one increases the amount of
transverse reinforcement, SM increases linearly.
LSD intervals are used when the effects are qualitative values, in this case, two
of the three effects are quantitative; therefore, for a comprehensive statistical
analysis, it would be suitable to decompose the quantitative effect in their linear and
quadratic components but, the analysis just done is considered suf
cient to study
these particular cases.
As it can be observed in the ANOVA table, in this Series all interactions were
statistically signi
cant.
In Figs.
8.21
,
8.22
and
8.23
are shown the surface charts for this case; these
graphs show how is affected the dependent variable (SM) for each combination
among the various levels of two simple effects.
2.8
2.1
SM = 1.7
1.9
1.7
1.5
1.3
SM = 1.5
1.1
0.9
1.4
0.7
0.5
0
1.49
3.05
SM = 1.3
f
R3
(MPa)
SM = 1.1
2.8
4.85
0
1.4
0
0
1.49
3.05
4.85
A
sw
/s (cm
2
/m)
f
R3
(MPa)
Fig. 8.21
In
fl
uence of the interaction between f
R3
and A
sw
/s in the SM according to EHE08
2.8
2.1
SM = 1.5
1.9
1.7
1.5
SM = 1.3
1.3
1.1
0.9
1.4
0.7
0.5
0
1.49
3.05
SM = 1.1
f
R3
(MPa)
2.8
0
4.85
1.4
0
1.49
3.05
4.85
0
A
sw
/s ( cm
2
/m)
f
R3
(MPa)
Fig. 8.22
Influence of the interaction between f
R3
and A
sw
/s in the SM according to MC2010
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