Punching of high strength concrete flat slabs without shear reinforcement

Inácio, Micael M.G.; Almeida, André; Faria, Duarte M.V.; Lúcio, Válter José da Guia; Ramos, Aura

doi:10.1016/j.engstruct.2015.09.010

Cited by 44 publications

(24 citation statements)

References 3 publications

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“…Experimental studies by Ref. [20] demonstrate that the use of High Strength Concretes (about 130 MPa) in flat slabs increases the punching capacity, but with a consistent decrease of ductility with respect to analogous slabs in Normal Strength Concretes. Similar results are obtained by other authors [23,24,33] in the case of High Strength Concretes characterized by a strength of about 90 MPa.…”

Section: Introductionmentioning

confidence: 96%

Punching shear behavior of lightweight fiber reinforced concrete slabs

Caratelli

Imperatore

Meda

et al. 2016

Composites Part B: Engineering

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Section: Introductionmentioning

confidence: 96%

Punching shear behavior of lightweight fiber reinforced concrete slabs

Caratelli

Imperatore

Meda

et al. 2016

Composites Part B: Engineering

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“…The use of highstrength concrete with a low reinforcement ratio resulted in bending controlled failure (flexural punching), whereas the use of normal-strength concrete for the same ρ resulted in brittle punching without reaching the flexural strength (Hallgren, 1996). Inacio et al (2013) showed that an increase in concrete strength (from 35 MPa to 125 MPa) resulted in the development of higher brittleness. One of the key parameters in increasing the punching shear strength is the thickness of the slab.…”

Section: Parameters Governing Punching Shear Strengthmentioning

confidence: 99%

“…Figures 9(b) and 9(c) plot the relationship between the flexural characteristics of the slab and the ultimate strength (in normalised values) of normal-strength concrete (Kinnunen and Nylander, 1960) and high-strength concrete (Inacio et al, 2013). Variation of the reinforcement ratio from low to high (0·54% to 2·10% and 0·94% to 1·49% respectively) reveals excellent agreement between the predicted and reported Equation 14 Equation 13 Equation 14 Equation 13 Equation 13 Equation 13 Equation 13 Equation 14 Equation 14 Equation 13 The influence of the slenderness of the slab is best captured by Equation 13 (Figure 9(d)), which closely predicts the ultimate punching strength from the tests reported by Tomaszewicz (1993).…”

Section: Parametric Comparisonsmentioning

confidence: 99%

“…The method is applicable to the assessment of the punching shear strength of flat slabs connected to interior columns with circular or rectangular cross-sections without shear reinforcement. The method proposed was validated with 209 tests on isolated specimens reported in the literature (suspended slabs and footings) (Al-Yousif and Regan, 2003;Bazant and Cao, 1987;Bernaert and Puech, 1966;Beutel, 2002;Birkle and Digler, 2008;Bompa and Oneţ, 2011;Broms, 1990;Caldentey et al, 2013;Elstner and Hognestad, 1956;Ghannoum, 1998;Guandalini et al, 2009;Gosav et al, 2013;Guidotti, 2010;Hallgren, 1996;Hegger et al, 2009;Heinzmann et al, 2012;Inacio et al, 2013;Kevin, 2000;Kinnunen and Nylander, 1960;Krueger, 1999;Ladner, 1998;Ladner et al, 1977;Marzouk and Hussein, 1991;McHarg, 1997;Menetrey, 2002;Moe, 1961;Mongi, 1990;Moreno, 2013;Muttoni, 2008;Muttoni and Fernandez Ruiz, 2012;Oliveira et al, 2004;Pralong, 1982;Ramadane, 1996;Regan, 1986;Rizk et al, 2011;Sagaseta et al, 2011;Schaefers, 1984;Swamy and Ali, 1982;Tomaszewicz, 1993;Urba...…”

Section: Ultimate Punching Shear Strengthmentioning

confidence: 99%

See 1 more Smart Citation

Punching shear strength of RC flat slabs at interior connections to columns

Bompa

Onet

2016

Magazine of Concrete Research

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A method to evaluate the punching shear strength of reinforced concrete (RC) flat slabs without shear reinforcement at the connection to interior columns is proposed. The method is based on the assumption that the punching shear strength is controlled by the inclination of a unique punching shear crack that produces a conical failure surface.The inclination angle of the crack is variable. It follows that the location of the critical section is not established in advance, but changes with crack angle. Its location depends on the reinforcement ratio, material strengths and effective depth. According to the proposed method, the punching shear strength is a function of the inclination angle of the governing crack that controls the amount of shear carried by the compression zone and the flexural reinforcement crossing the potential punching cone by accounting for its slenderness and concrete size effect. The method describes the behaviour observed in tests and numerical and analytical investigations. The novel premise that the punching shear strength of flat slabs at connections to interior columns is controlled by the inclination of the failure surface shows remarkable agreement with the results of 209 tests on isolated specimens reported in the literature. This paper also assesses the adequacy of strength predictions obtained using the proposed method and the methods adopted in the codified provisions.

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“…The residual strength after the impact was sufficient to carry the static load of impact test. MICAEL INACIO, et.al, [5] An experimental research was conducted to investigate the punching behaviour of high strength concrete (HSC) flat slabs, presenting a compressive concrete strength of 130 MPa. All specimens exhibited a decrease of stiffness when the flexure cracks start to form and develop.…”

Section: Andreas Andresson [4]mentioning

confidence: 99%