Punching shear strength of reinforced concrete flat slabs subjected to fire on their tension sides

Salem, Hamed; Issa, Heba; Gheith, Hatem; Farahat, Ahmed

doi:10.1016/j.hbrcj.2011.10.001

Cited by 27 publications

(20 citation statements)

References 4 publications

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“…Complexity is introduced into the punching shear behaviour by restrained support conditions causing restrained thermal expansion leading to in-plane forces. There have been some experimental tests of punching shear in fire (Kordina, 1997, Annerel et al, 2011, Salem et al, 2012and Ghoreishi et al, 2013, but none that has looked at restraint conditions. This paper presents experimental results from three types of model slab-column specimens: ambient/simply supported, heated/simply supported and heated/fully restrained.…”

Section: Introductionmentioning

confidence: 99%

Deflection Response of Reinforced Concrete Slabs Tested in Punching Shear in Fire

Smith

Stratford²,

Bisby

2016

ASFE

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Section: Introductionmentioning

confidence: 99%

Deflection Response of Reinforced Concrete Slabs Tested in Punching Shear in Fire

Smith

Stratford²,

Bisby

2016

ASFE

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“…When the temperature reached to 300℃ in the steel reinforcement, the steel yield strength began to decrease causing a decrease in the bending moment and membrane strength. Hamed et al [15] investigated experimentally the effect of fire on punching strength of flat slabs. Fourteen specimens were fired on their tension and then cooled gradually or suddenly by spraying water.…”

Section: Literature Reviewmentioning

confidence: 99%

Steel Fiber Enhancement upon Punching Shear Strength of Concrete Flat Plates Exposed to Fire Flame

Dalaf

Mohammed

2021

Civ Eng J

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In this study, the effect of fire flame on the punching shear strength of steel fiber reinforced concrete flat plates was experimentally investigated using nine half-scale specimens with dimensions of 1500×1500 mm and a total thickness of 100 mm. The main investigated variables comprised the steel fiber volume fraction 0, 1, and 1.5% and the burning steady state temperature 500 and 600 °C. The specimens were divided into three groups, each group consists of three specimens. The specimens in the first group were tested with no fire effect to be the reference specimens, while the others of the second and third groups were tested after being exposed to fire-flame effect. The adopted characteristics of the fire test were; (one hour) burning time duration and 500 and 600 °C steady state temperature with sudden cooling process (water sprinkling directly after burning). The test results proved that exposing to direct fire effect for one hour caused a reduction in the punching shear strength with an increase in the ultimate mid-span deflection. Also, it was noticed that using steel fiber in the concrete mix leads to a significant increase in the punching shear strength for both the unburned and burned specimens. The ultimate punching load increased by about 11 and 16.6% for the unburned specimens with 1.0 and 1.5% steel fiber volume fraction, respectively, and by about 22.4 and 19% for the burned specimens at 500 °C with 1.0 and 1.5% steel fiber volume fraction, respectively. While, it was increased by about 29.2 and 21.5% for the burned specimens at 600 °C with 1.0 and 1.5% steel fiber volume fraction, respectively, as compared with the reference specimen of each group. Doi: 10.28991/cej-2021-03091751 Full Text: PDF

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“…In 2004 following a fire-related collapse of a car park building in Gretzenbach, Switzerland [1], further experimental studies were carried out on punching shear in heated slabs by various researchers. The first of these post-2004 studies was by Salem et al [3], a schematic of the test set-up is shown in Figure 1. The main focus of the work by [3] was the effect of the heating application on the tension side of the slab at the column connection.…”

Section: Introductionmentioning

confidence: 99%

“…The first of these post-2004 studies was by Salem et al [3], a schematic of the test set-up is shown in Figure 1. The main focus of the work by [3] was the effect of the heating application on the tension side of the slab at the column connection. However, this would not normally be the most affected zone in a realfire, as the fire will rise upward.…”

Section: Introductionmentioning

confidence: 99%

Influence of loading ratio on flat slab connections at elevated temperature: A numerical study

Al‐Hamd

Gillie

Mohamad

et al. 2020

Front. Struct. Civ. Eng.

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For reinforced concrete members subjected to high temperature, the degree of in-service loading, commonly expressed as the loading ratio, can be highly influential on the structural behaviour. In particular, the loading ratio may be pivotal in relation to the phenomenon of load-induced thermal strain. Despite its potentially pivotal role, to date, the influence of the loading ratio on both material and structural behaviour has not been explored in detail. In practice, real structures experience variation in imposed loading during their service life and it is important to understand the likely response at elevated temperatures across the loading envelope. In this paper, the effect of the loading ratio is numerically investigated at both material and structural level using a validated finite element model.The model incorporates a proposed constitutive model accounting for load-induced thermal strain and this is shown to outperform the existing Eurocode 2 model in terms of accuracy. Using the validated model, the specific case of flats slabs and the associated connections to supporting columns at various loading ratios are explored. For the cases examined, a marked difference in the structural behaviour including displacement direction was captured from low to high loading ratios consistent with experimental observations.

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Punching shear strength of reinforced concrete flat slabs subjected to fire on their tension sides

Cited by 27 publications

References 4 publications

Deflection Response of Reinforced Concrete Slabs Tested in Punching Shear in Fire

Deflection Response of Reinforced Concrete Slabs Tested in Punching Shear in Fire

Steel Fiber Enhancement upon Punching Shear Strength of Concrete Flat Plates Exposed to Fire Flame

Influence of loading ratio on flat slab connections at elevated temperature: A numerical study

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