Punching shear tests on steel-fibre-reinforced micro-concrete slabs

Narayanan, R.; Darwish, I. Y. S.

doi:10.1680/macr.1987.39.138.42

Cited by 67 publications

(54 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The experimental data is used to assess the strength predictions according to the models proposed by Narayanan and Darwish [6], Harajli et al [8] and Higashiyama et al [16], and the results obtained are shown in Fig. 11.…”

Section: Comparison To Other Prediction Modelsmentioning

confidence: 99%

“…(B.1) presents the simplified expression developed by Narayanan and Darwish [6] to estimate the ultimate punching shear strength of FCR slabs. where k s is the size effect factor that depends on the slab depth h; …”

Section: B1 Model By Narayanan and Darwish [6]mentioning

confidence: 99%

“…The design equation considers the fibre pull-out strength v b and the perimeter of the basic critical section b 0 empirically modified by the fibre factor F, as proposed by Narayanan and Darwish [6]. …”

Section: B2 Model By Harajli Et Al [8]mentioning

confidence: 99%

“…More recently, the use of fibre reinforced concrete (FRC) for increasing the punching shear capacity has been studied (e.g. [5][6][7][8][9][10]). These studies have confirmed an increase in the punching shear strength of FRC slabs as well as an increase in their deformational capacity and this enhancement is mostly due to the bridging action of the fibres after the cracking of the concrete matrix (shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

“…To this end, several specific models for punching shear of FRC slab-column connections have been proposed over the last decades. Narayanan and Darwish [6] provided a design equation for the punching shear capacity of SFRC slab considering the strength of the compressive zone above the top of the inclined cracks, the pull-out shear forces on the fibres along the inclined cracks and the shear forces carried by dowel and membrane actions. Harajli et al [8] proposed an empirical design equation for the punching shear capacity of SFRC slab-column connections based on a best fit linear regression of the coupled contribution of concrete and fibres.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Punching shear strength of steel fibre reinforced concrete slabs

Maya

Ruiz

Muttoni

et al. 2012

Engineering Structures

118

View full text Add to dashboard Cite

Section: Comparison To Other Prediction Modelsmentioning

confidence: 99%

Section: B1 Model By Narayanan and Darwish [6]mentioning

confidence: 99%

Section: B2 Model By Harajli Et Al [8]mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Punching shear strength of steel fibre reinforced concrete slabs

Maya

Ruiz

Muttoni

et al. 2012

Engineering Structures

118

View full text Add to dashboard Cite

Experimental and theoretical evaluation of punching strength of steel fiber reinforced concrete slabs

Gouveia

Lapi

Orlando

et al. 2017

Structural Concrete

View full text Add to dashboard Cite

This paper deals with the experimental and theoretical evaluation of punching shear capacity of steel fiber reinforced concrete (SFRC) slab-column connections. Five experimental specimens with a thickness of 160 mm, different fiber volume contents (0, 1.0, and 1.5%) and different flexural reinforcement ratios (0.75 and 1.5%) have been tested. The experimental results were evaluated using a physicalmechanical model based on the critical shear crack theory (CSCT). The model has given a good approximation of experimental punching shear strengths. In general, tests have highlighted a significant increase in load and deformation capacity of fiber reinforced concrete slab-column connections in comparison with reinforced concrete connections.Punching failure mechanism has been the issue of several studies since the early twentieth century until today. In the early 1960s, Kinnunen and Nylander 1 developed a landmark mechanical model for subsequent theories. This model is based on the assumption that punching shear strength is attained at a given critical rotation of the slab. In 1989, Shehata and Regan, 2 starting from Kinnunen and Nylander approach, proposed a new model where they hypothesized three different types of failure. In 1990, Broms 3 improved Kinnunen and Nylander model, including unsymmetrical punching and size effect.In 1991, Muttoni and Schwartz 4 presented the basis of a new mechanical model, whose first draft was published in 2003 5 ; finally, in 2008, the final version of the critical shear crack theory (CSCT) was published. 6 CSCT describes the relationship between punching strength and the width of the critical shear crack accounting for its roughness. Two curves are defined, the first curve describing the failure criterion, and the second representing the load-rotation relationship of the flat slab. The critical state is set at the intersection between these two curves (Figure 1).The CSCT, thanks to its versatility and consistency, can be used in many different cases, like flat slabs with shear reinforcement 7,8 , SFRC slabs 9,10 , and prestressed concrete slabs. [11][12][13][14] Furthermore, CSCT can be applied to slabs strengthened using different techniques, like externally glued fiber reinforced polymers 15 or post-installed shear reinforcement. [16][17][18] For this reason, CSCT has been included in codes of practice and it is the basis for fib Model Code 2010 19 punching design and verification.When fibers are added to concrete, the mechanical properties of concrete change. The post-cracking tensile behavior improves, as fibers delay crack propagation. The behavior of the composite material (SFRC) is highly affected by the fiber reinforcement ratio. The softening behavior, typical of uniaxial test, can be significantly modified by the presence of fibers (Figure 2).

show abstract

Shear behavior of high‐performance basalt fiber concrete—Part II: Laboratory punching shear tests on small slabs with macrofibers without bars

Mohaghegh

Silfwerbrand

Årskog

2018

Structural Concrete

View full text Add to dashboard Cite

This paper presents findings from a study on punching shear capacity of highperformance concrete slabs reinforced with macrobasalt fibers. The punching shear failure is simulated through a simple method introduced by Hassan et al. The test specimens comprised 14 small-scale slabs with circular notches. To investigate the effect of fiber content, 5 different fiber volume fractions of 43 mm macrobasalt fibers have been studied. The results show that the punching shear capacity and the ductility of the slabs were slightly improved with increasing the fiber content. Furthermore, the results also indicate that the outcome of the experimental method is valid when the rotation of the slabs is negligible.

show abstract

Punching shear tests on steel-fibre-reinforced micro-concrete slabs

Cited by 67 publications

References 2 publications

Punching shear strength of steel fibre reinforced concrete slabs

Punching shear strength of steel fibre reinforced concrete slabs

Experimental and theoretical evaluation of punching strength of steel fiber reinforced concrete slabs

Shear behavior of high‐performance basalt fiber concrete—Part II: Laboratory punching shear tests on small slabs with macrofibers without bars

Contact Info

Product

Resources

About