Reinforced concrete ribbed slabs with wide-beam

Sacramento, Paulo; Picanço, Marcelo S.; Oliveira, Dênio Ramam Carvalho de

doi:10.1590/s1983-41952018000500005

Cited by 5 publications

(3 citation statements)

References 5 publications

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“…Experimental studies such as those by Al-Bayati et al [1], [2], Arunkumar et al [3] and Sacramento et al [4] showed that the reduction of the solid area in waffle flat slabs can reduce their ultimate strength, leading to the punching shear cone extending beyond the solid area. There is a rule of thumb among designers to use the length of the solid area to be at least equal to 15% of the clear span between columns, but there is no scientific basis for this rule.…”

Section: Justificationmentioning

confidence: 99%

“…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%

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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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Section: Justificationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Punching shear strength of waffle flat slabs

Silva

Oliveira

Albuquerque

et al. 2021

Rev. IBRACON Estrut. Mater.

View full text Add to dashboard Cite

show abstract

“…Ribbed and waffle slab types have many advantages. Due to the presence of voids in these slabs, the dead weight will decrease; consequently, the concrete below the neutral axis will also decrease [17]. Yet, both of these slab types have disadvantages when employed in seismic areas since they exhibit low rigidity and ductility [18].…”

Section: Introductionmentioning

confidence: 99%

Effects of Slab Types on the Seismic Behavior and Construction Cost of RC Buildings

Tunç

AZİZİ

TANFENER³

2023

Politeknik Dergisi

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Key effects on the structural behavior of fiber-reinforced lightweight concrete-ribbed slabs: A review

Yahya,

Galeb

2024

Open Engineering

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A concrete slab is one of the chief structural members in buildings, considered the most prominent member consuming concrete. Structural engineers are challenged to work on the new trend introduced using different slabs. One-way ribbed slabs are commonly used in construction due to their efficiency in spanning long distances while maintaining a low overall depth and giving the least possible number of columns. The main limitation of slab design in the construction of a reinforced concrete structure is the span between columns; a greater span between columns necessitates more supported beams or increased slab thickness; these requirements lead to an increase in the structure weight due to other concrete and steel which make the structure more costly. On the other hand, any increase in the structure’s self-weight limits the horizontal slab’s span, increases the structure’s stress, and raises the inertia forces that must be resisted. Lightweight aggregate concrete has been effectively utilized for structural applications for a long time. The density of lightweight concrete (LWC) is sometimes more essential than its strength in structural applications. The dead load is reduced for structural design and foundations when the density is lower for the same strength level. Reinforced concrete ribbed slabs have become increasingly popular in industry construction as an alternative to solid slabs in building structures. The incorporation of steel fibers facilitates flexural softening, which takes longer than sudden brittle failure, indicating its ability to increase energy absorption and improve crack behavior. Designing structures requires materials with higher strength-to-weight ratios. Ribs and LWCs are two leading sustainable assets. The world is moving toward sustainability by reducing the amount of concrete used and the overall weight of the unit. Studies have shown that the drop in compressive strength was about 4.85–65.55%. The structural performance of lightweight fiber-reinforced concrete slabs is influenced by the concrete mix ratio, fiber type and content, reinforcement detail, and rib geometry. The study provides valuable insights into the properties and performance of key effects on the structural behavior of fiber-reinforced LWC-ribbed slabs. It provides recommendations for future research and advancement of sustainable building methods.

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Reinforced concrete ribbed slabs with wide-beam

Cited by 5 publications

References 5 publications

Punching shear strength of waffle flat slabs

Punching shear strength of waffle flat slabs

Effects of Slab Types on the Seismic Behavior and Construction Cost of RC Buildings

Key effects on the structural behavior of fiber-reinforced lightweight concrete-ribbed slabs: A review

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