Behaviour of punching shear in normal RC slab and waffle slab

Arunkumar, C.; Saketh, K.; Senthil, S. Srinivasa; Jeyashree, T. M.

doi:10.1007/s42107-018-0003-x

Cited by 8 publications

(6 citation statements)

References 2 publications

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“…Providing additional depth and thickness to the ribs for the waffle slabs subjected to eccentric loading improved the stiffness and the punching shear strength [10]. A comprehensive analysis established optimal joist spacing, and the results showed variety in optimum spacing depending on panel dimensions.…”

Section: Geometry Effectmentioning

confidence: 94%

Waffle, Ribbed and Composite Joists Slabs: A Review Study

Al-Issawi,

Alshareef,

Al-Ameeri

2023

Construction Technologies and Architecture

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Due to the importance of the joists slab system as an excellent solution for increasing span demands in different building types, investigating its properties becomes essential for different researchers. The effects of numerous parameters on the structural behaviour of the joists slab system, whether it was a waffle, ripped, or composite sections were reviewed in this paper from past studies. This study aims to determine the most effective parameters for the joist's system loading capacity. The main conclusions were that the slab thickness and joist height were the critical parameters for increasing the load capacity and stiffness of the slab. Furthermore, a small opening in the slab was more efficient in reducing the punching shear effect than larger openings. While providing stiffening rips around the opening was more effective in rose load bearing and reducing deflection than strengthening by carbon fibre sheets.

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Section: Geometry Effectmentioning

confidence: 94%

Waffle, Ribbed and Composite Joists Slabs: A Review Study

Al-Issawi,

Alshareef,

Al-Ameeri

2023

Construction Technologies and Architecture

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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%

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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“…The effectiveness of two configurations of steel plates and four different arrangements of steel bolts were evaluated. Arunkumar et al (2018) presented the behavior of punching shear in waffle slabs at slab – column joints subjected to concentric loading. The comparison of the test results reveals that the waffle slab gives more strength than the conventional slab.…”

Section: Introductionmentioning

confidence: 99%

Behavior of strengthened concrete slab under eccentric compressive load

Bouamra

Taouche-Kheloui

Tahar

2021

WJE

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Purpose The purpose of this study is experimental research of the mechanical behavior of slab reinforced by cork composite patch submitted to an eccentric progressive compressive load applied to on impact rectangle of dimensions 28 × 23 cm2. An analytical model and numerical modeling by finite elements are performed. This study is motivated by the evaluation of the effectiveness of this type of partial reinforcement to improve strength and ductility. The results are given by load-displacement curves, tensile damages cartography and ultimate strength histogram. Design/methodology/approach In experimental protocol, the following two parameters have been considered: the dimensions of the patch and the eccentricity of the load. The sections of the patches are calculated so that the ratio (XP/YP) patch is proportional to the ratio (LD/lD), with a step of 6 cm longitudinally and 4 cm transversely. Several dimensions patches are considered: (6 × 4) cm2, (12 × 8) cm2 and (18 × 12) cm2. The eccentric punching loading test was performed with an eccentricity of the load (1/3) L’ and (2/3) L’ compared to the center of gravity of the slab. Taking into account the eccentricity of the load in estimating the rupture strength, the equations are developed. Thus, numerical simulations are carried, to extract tensile damages cartography. Findings The results show that the rupture begins with the appearance of cracks in the unreinforced area. For an eccentricity of 1/3L’2, whereas for an eccentricity de 2/3L’, the patch (6 × 4) cm2 gives a better resistance. The results highlight the influence of the composite on the ultimate load. The force-displacement relations are little modified in the elastic phase. The experimental results have been compared with the theoretical models showing a good correlation. Originality/value The strength and ductility are depended on the dimensions of the patch and the eccentricity of the load. The use of a patch to cover the most stressed area, in the event of an eccentric axial load is a very economical solution compared to the total reinforcement. The damage field shows that the evolution of cracks depends on dimensions and the position of the patch. Indeed, the eccentricity of the vertical load induces an additional bending moment that will influence the fracture surface. The rupture load and ultimate displacement increase with the surface of the patch.

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Behaviour of punching shear in normal RC slab and waffle slab

Cited by 8 publications

References 2 publications

Waffle, Ribbed and Composite Joists Slabs: A Review Study

Waffle, Ribbed and Composite Joists Slabs: A Review Study

Punching shear strength of waffle flat slabs

Behavior of strengthened concrete slab under eccentric compressive load

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