### The ductile/brittle transition in concrete beams in ...

01-01-1990 THE DUCTILE/BRITTLE TRANSITION IN CONCRETE BEAMS IN RELATION TO THE SERVOCONTROL SYSTEM OF THE TESTING MACHINE S. CANGIANO and G. TOGNON Central Chemical Laboratory, Italcementi S.p.A., Bergamo, Italy Abstracthe fracture behaviour (mode I) of concrete beams and in particular, their ductile/brittle transition, was studied within the problem of

Get price### The ductile/brittle transition in concrete beams in ...

The fracture behaviour (mode I) of concrete beams and in particular, their ductile/brittle transition, was studied within the problem of the interaction between testing machine and specimen. The tests were carried out by means of a closed loop servocontrolled testing machine. CMOD (crack mouth opening displacement) was chosen as a feedback ...

Get price### Ductile‐to‐brittle transition in fibre‐reinforced concrete ...

This ductile-to-brittle transition can be described by a dimensionless parameter called brittleness number, NP. This parameter is a function of the toughness of the matrix, of the yielding or slippage limit of the fibre-reinforcement, of the fibre volume fraction of the

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to-brittle transition is found for each beam scale, as predicted by N P. As a conse-quence, the minimum fibre volume fraction can be defined according to this model, providing an effective structural bearing capacity of FRC structural members. KEYWORDS bridged crack model, constitutive laws, ductile-to-brittle transition, fibre-reinforced

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Semantic Scholar extracted view of "Ductile‐to‐brittle transition in fibre‐reinforced concrete beams: Scale and fibre volume fraction effects" by F. Accornero et al.

Get price### The Ductile to Brittle Transition - K Street Studio

Ductile to Brittle Transition: The ductile to brittle transition is characterized by a sudden and dramatic drop in the energy absorbed by a metal subjected to impact loading. This transition is practically unknown in fcc metals but is well known in bcc metals. As temperature decreases, a

Get price### Double brittle-to-ductile transition in bending of fibre ...

Double brittle-to-ductile transition in bending of ﬁbre reinforced concrete beams with rebars Alberto Carpinterin,y, Giuseppe Ferro and Giulio Ventura Department of Structural and Geotechnical Engineering, Politecnico di Torino, C.so Duca degli Abruzzi 24-10129 Torino, Italy SUMMARY

Get price### Dimensional analysis of over-reinforced concrete beams in ...

In all these cases a transition from ductile to softening, or even snap-back, failure is evidenced by decreasing the brittleness number. In the present paper, Dimensional Analysis is applied to the model proposed by Carpinteri et al. [12,13], for the assessment of the rotational capacity of reinforced concrete beams in bending. In

Get price### (PDF) DIFFERENT COLLAPSE MODES IN RC BEAMS: A UNIFIED ...

A reinforced concrete beam section with a through-thickness edge crack in the stretched part is considered. ... as well as a ductile to brittle transition in the constitutive relationship, ...

Get price### Design of Reinforced Concrete Beams per ACI 318-02

A) Flexural Strength of Reinforced Concrete Beams and Slabs 1. Introduction The design of reinforced concrete structural members may be done by two different methods. One, called working stress design (WSD), is based on the straight-line distribution of compressive stress in the concrete (Fig. 1), covered in Appendix B by ACI 318.

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Ductile‐to‐brittle transition in fibre‐reinforced concrete beams: Scale and fibre volume fraction effects January 2020 Material Design Processing Communications 2(6)

Get price### Fiber volume fraction and ductility index of concrete beams

Abstract. The mechanical response of fiber-reinforced concrete (FRC) beams depends on the amount of fibers, and the transition from brittle to ductile behavior in bending is related to a critical value of fiber volume fraction. Such quantity, which is mechanically equivalent to the minimum amount of steel rebars in reinforced concrete beams ...

Get price### Dimensional analysis of over-reinforced concrete beams in ...

In all these cases a transition from ductile to softening, or even snap-back, failure is evidenced by decreasing the brittleness number. In the present paper, Dimensional Analysis is applied to the model proposed by Carpinteri et al. [12,13], for the assessment of the rotational capacity of reinforced concrete beams in bending. In

Get price### Ductile-brittle transition and minimum reinforcement ratio ...

The American Concrete Institute. Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design ...

Get price### Failure mode transitions in RC beams: A cohesive ...

Keywords Reinforced concrete beams Ductile-to-brittle transitions Size-scale effects Structural instability Cohesive crack 1 Introduction The failure mode of RC beams in ﬂexure is affected by nonlinearities of the constituent materials such as concrete tensile cracking, concrete compressive crush-ing and steel yielding and/or slippage.

Get price### (PDF) Scale Effects and Transitional Failure Phenomena of ...

To study the brittle/ductile transition (i.e., the minimum reinforcement), the flexural behavior of concrete beams containing low amounts of rebar, fibers, or a combination, is predicted through ...

Get price### Scale‐dependent maximum reinforcement percentage in ...

Upper bound ductile-to-brittle transition in RC beams In Table 2 , the β parameters and the ultimate strain of concrete, ε c , provided by different international codes of practice are reported. It is possible to observe that all the considered provisions are rather similar, except for IS456:2000 45 , which provides a smaller equivalent stress-block at Ultimate Limit State.

Get price### Ductile Failures in Reinforced Concrete Beams Strengthened ...

Ductile Failures in Reinforced Concrete Beams Strengthened using FRP’s, Haywood 2006 2 the concrete to fail in compression, at a higher load, whilst maintaining the ductile characteristics that give early indication of failure. 2. DUCTILITY a. What is RC Beam Ductility?

Get price### Scale Effects and Transitional Failure Phenomena of ...

01-01-1999 In particular, the beam C200-12 shows a less brittle response than the beam B200-12, characterized by the same reinforcement ratio and slenderness. For slenderness 18 , ductile behaviour is shown only by the beams with reinforcement ratios equal to 0.50% and 1.00%. Download : Download full-size image; Figure 19.

Get price### Design of Reinforced Concrete Beams per ACI 318-02

A) Flexural Strength of Reinforced Concrete Beams and Slabs 1. Introduction The design of reinforced concrete structural members may be done by two different methods. One, called working stress design (WSD), is based on the straight-line distribution of compressive stress in the concrete (Fig. 1), covered in Appendix B by ACI 318.

Get price### Ductile-brittle transition for reinforced concrete beams ...

Ductile-brittle transition for reinforced concrete beams : experimental and numerical investigation. Ecf11 Poitiers 1996, 2013. Crescentino Bosco. Giuseppe Ferro. Crescentino Bosco. Giuseppe Ferro. Download PDF. Download Full PDF Package. This paper. A short summary of this paper.

Get price### Fiber volume fraction and ductility index of concrete beams

Abstract. The mechanical response of fiber-reinforced concrete (FRC) beams depends on the amount of fibers, and the transition from brittle to ductile behavior in bending is related to a critical value of fiber volume fraction. Such quantity, which is mechanically equivalent to the minimum amount of steel rebars in reinforced concrete beams ...

Get price### Dimensional analysis of over-reinforced concrete beams in ...

In all these cases a transition from ductile to softening, or even snap-back, failure is evidenced by decreasing the brittleness number. In the present paper, Dimensional Analysis is applied to the model proposed by Carpinteri et al. [12,13], for the assessment of the rotational capacity of reinforced concrete beams in bending. In

Get price### Failure mode transitions in RC beams: A cohesive ...

Keywords Reinforced concrete beams Ductile-to-brittle transitions Size-scale effects Structural instability Cohesive crack 1 Introduction The failure mode of RC beams in ﬂexure is affected by nonlinearities of the constituent materials such as concrete tensile cracking, concrete compressive crush-ing and steel yielding and/or slippage.

Get price### New Model for the Analysis of Size-Scale Effects on the ...

In particular, the most suitable model for concrete was ﬁrst pro-posed by Hillerborg et al. 1976 with the name of ﬁctitious crack model. Afterward, Carpinteri 1985, 1989 , proposed an updated algorithm referred to as cohesive crack model for the study of ductile-brittle transition and snap-back instability in concrete ele-ments in bending ...

Get price### Ductile Failures in Reinforced Concrete Beams Strengthened ...

Ductile Failures in Reinforced Concrete Beams Strengthened using FRP’s, Haywood 2006 2 the concrete to fail in compression, at a higher load, whilst maintaining the ductile characteristics that give early indication of failure. 2. DUCTILITY a. What is RC Beam Ductility?

Get price### Methods to Improve Ductility of RCC Beams with FRP Bars

In buildings where non-magnetic properties are needed, fibers can be used to achieve that purpose. It is claimed by Jeong and Namman that, the utilization of fibers in otherwise brittle concrete beams produce ductility indices which are between 2.9 and 5.45 and fracture energy ratios ranging from 3.7 to 9.2.

Get price### Fiber volume fraction and ductility index in fiber ...

01-01-2016 Since DI is proportional to the difference between ultimate and effective cracking loads, the brittle/ductile transition corresponds to DI equal to zero. ... Fiber volume fraction and ductility index of concrete beams. Cement and Concrete Composites, 65 (2016), pp. 139-149. Article Download PDF View Record in Scopus Google Scholar.

Get price### Design of Reinforced Concrete Beams per ACI 318-02

A) Flexural Strength of Reinforced Concrete Beams and Slabs 1. Introduction The design of reinforced concrete structural members may be done by two different methods. One, called working stress design (WSD), is based on the straight-line distribution of compressive stress in the concrete (Fig. 1), covered in Appendix B by ACI 318.

Get price### Difference Between Ductile Material and Brittle Material

Similarities and differences between ductile material and brittle material are provided in this article. At a particular temperature, a ductile material exhibits substantial plastic deformation under external loading, while a brittle material breaks with negligible plastic deformation under tensile stress.

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