Shear Database and Study of the Parameters Influencing Shear Behavior - On Shear Behavior of Structural Elements Made of Steel Fiber Reinforced Concrete - page 142

Chapter 8
Shear Database and Study
of the Parameters In fl uencing
Shear Behavior

8.1 Introduction

After thorough review of the literature on structural elements with shear failure, and
after conducting several experimental programs whose values were compared later
with the theoretical values obtained with the three selected Design Codes to cal-
culate shear in elements reinforced with

bers, it was found that it would be useful
and also necessary to build a large database of elements failing in shear in order to
have a large number of cases that allow to better evaluate resisting phenomena and
the validity of building Codes. For this reason, this chapter shows the analysis of
that database.
The structure of this chapter is the following: Sect. 8.2 explains how the data
have been selected. Data are analyzed separately in four cases: Case 1 encompasses
the concrete beams with any shear reinforcement (neither bers nor stirrups); Case

2 concerns beams with only stirrups (no bers); Case 3 refers to beams with only

bers (no stirrups) and Case 4 concerns beams with bers and stirrups. In each of

these four cases the in fl uence of the following parameters is analyzed: d, a/d, f cm ,

f R3 , bers and stirrups.

In Sect. 8.7 particular cases, that are subsets of the entire database, have been
analyzed. The subsets have been organized to study the in

ρ , ˃ c , and amount of

uence of single factors
but also double interactions (interaction between 2 parameters). For each subset, an
analysis of variance (ANOVA) has been performed and, to analyze the in

fl

uence of
each level of parameter in the SM, LSD have been determined. On the other hand,
interaction graphs have been done to analyze the interaction between two different
parameters into the SM.
Section 8.8 describes the conclusions of the in

fl

fl uence of each parameter (d, a/d,

etc.) in the safety margin (SM).
Finally, in Sect. 8.9 are listed some suggestions or modi cations to the selected

Codes according to the results and trends observed in this chapter.