Concentric Punching Shear of Waffle Slab

Al-Bayati, Ahmed Faleh; Leong, Lau Teck; Clark, Leslie

doi:10.14359/51687906

Cited by 15 publications

(7 citation statements)

References 12 publications

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“…The Brazilian code, for example, proposes that ribbed slabs are checked, or solid slabs are considered, or beams based on the limits of spacing between the ribs are considered. Nevertheless, studies by Al-Bayati [10] have shown that checks suggested for the system, based on the concepts of a solid slab, are not fully applicable since the dimensions of the wide-beam directly imply the type of slab failure. In fact, a failure may occur in some cases by punching shear in wide-beam-column connection.…”

Section: Justificationmentioning

confidence: 99%

Reinforced concrete ribbed slabs with wide-beam

Sacramento

Picanço

Oliveira

2018

Rev. IBRACON Estrut. Mater.

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Ribbed slabs have been widely used in buildings due to their many advantages, especially the decrease of concrete below the neutral line. This paper presents an experimental and computational study on ribbed slabs with wide-beam, two one-way slabs and two two-way slabs, with variable depths were tested to evaluate their resistance to punching and shear strength of slabs. Experimental and computational results showed that the wide-beam ribs connection is a critical point in the design of the slabs due to the difference in stiffness in the transition zone. Best results for the ultimate load estimates for ribs were provided by EC 2 (2004), while estimates of ACI 318 (2008) and NBR 6118 (2014) were respectively conservative and unsafe. Test results on slabs also revealed that the Brazilian alternative to analysis ribbed slabs as solid ones failed to give satisfactory results.

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Section: Justificationmentioning

confidence: 99%

Reinforced concrete ribbed slabs with wide-beam

Sacramento

Picanço

Oliveira

2018

Rev. IBRACON Estrut. Mater.

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“…[11][12][13][14][15] Prefabricated monolithic slab consists of beams placed close to each other, molding blocks filling the space between the beams, and monolithic concrete, poured above the fabricated construction at the construction site (Fig.1).…”

Section: Slabs «Marko» Which Made From Beams With Metal Molded Sectionmentioning

confidence: 99%

Fire resistance of prefabricated monolithic slab

et al. 2017

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Abstract.A prefabricated monolithic slab (PMS) has a number of valuable advantages, they allow to significantly decrease the weight of construction keeping the necessary structural-load capacity, to speed up and cheapen work conduction, to increase the heat isolating properties of an enclosure structure [1]. In order to create a design method of prefabricated monolithic slab fire-resistance, it's necessary to perform a series of PMS testing, one of which is being described in this article. Subjected to the test is a fragment of prefabricated monolithic slab with polystyrene concrete inserts along the beams with bent metal profile 250 mm thick, with a 2.7 m span loaded with evenly spread load equal to 600 kg/m2. After 3 hour testing for fire-resistance [2] no signs of construction ultimate behavior were detected.

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“…Al-Bayati et al [1], [2], Arunkumar et al [3] and Sacramento et al [4] observed that some tested waffle slabs had their strength reduced when the punching shear cone reached the ribbed region. That is, in order to avoid a bearing capacity reduction of the slab, it is of fundamental importance that the punching shear cone is located within the solid area of the slab.…”

Section: Introductionmentioning

confidence: 99%

Punching shear strength of waffle flat slabs

Silva

Oliveira

Albuquerque

et al. 2021

Rev. IBRACON Estrut. Mater.

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This research aimed to compare the ultimate load of 10 waffle flat slabs with different sizes of solid area and spacing between ribs. For this, a non-linear computational simulation of the slabs was carried out until their failure using the engineering software ANSYS. The failure modes and loads were analyzed, and the results showed that the models with less solid area presented less bearing capacity in comparison to the models with greater solid area when the failure mode was shearing of the ribs. The slabs with the largest solid regions experienced punching shear and behaved in a similar way as solid flat slabs, indicating compliance with the codes in relation to their punching shear strength provisions, especially with the NBR 6118. The results show that a square solid area whose length is 15% of the span is reasonable and that the ACI, Eurocode 2 and NBR 6118 provisions underestimate the shear strength of the ribs.

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Concentric Punching Shear of Waffle Slab

Cited by 15 publications

References 12 publications

Reinforced concrete ribbed slabs with wide-beam

Reinforced concrete ribbed slabs with wide-beam

Fire resistance of prefabricated monolithic slab

Punching shear strength of waffle flat slabs

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