Shear Database and Study of the Parameters Influencing Shear Behavior - On Shear Behavior of Structural Elements Made of Steel Fiber Reinforced Concrete - page 173

Table 8.24 Constant
variables between the beams
within the same series (Brite
Series 3-II)

Constant variables
Cross-section shape: Doble-T reinforced (no prestressed) beams
No stirrups
3 point test
a/d = 3.5
40 kg/m 3 of bers RC 65/60BN
b w = 200 mm
ρ l (%) = 2.8
h = 500 mm
b f = 500 mm

Table 8.25 Factors and
dependent variable analyzed
in the ANOVA analysis of
Brite Series 3-II

Factors (independent variables)
h f (mm): 100, 150, 230
Codes: EHE08, MC2010, RILEM
Dependent variable
Shear safety margin (SM)

The ANOVA table (Table 8.26 ) shows that both factors are signi cant. Since

both p-values are less than 0.05, these factors have a statistically signi cant shear

on SM on a 95.0 % con dence level.

By means of LSD intervals (Fig. 8.29 ), in this Series 3-II, it can be observed that
there are not signi cant differences in SM between the different levels inside the

same factor. In this particular case, Series 3-II, there are not signi cant differences

between ange depth of 100 and 150 mm, being the Codes unconservative but, the

SM corresponding to h f = 230 mm is clearly different than the other two. There are
not signi

fl

cant differences between EHE and RILEM; only MC2010 is different
than the other two reaching the greatest SM in shear.
In this case, there are not enough degrees of freedom to study interactions so,
only simple effects have been studied.

Table 8.26 Analysis of variance (ANOVA) for SM on shear — type III sums of squares (Series

3-II)
Source of variation Sum of Squares d.f Mean square F-ratio p-value

Main effects
A: h f (mm) 0.417156 2 0.208578 105.46 0.0003

0.0132

B: Code 0.0609556 2 0.0304778 15.41

Residual 0.00791111 4 0.00197778

Total (corrected) 0.486022 8
All F-ratios are based on the residual mean square error