Punching shear behaviour of shear reinforced concrete slabs

Choi, Kyoung‐Kyu; Truong, Gia Toai; Kim, Seon-Du; Choi, In-Rak

doi:10.1680/stbu.14.00062

Cited by 7 publications

(3 citation statements)

References 21 publications

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“…Choi vd. [6] yaptıkları deneysel çalışmada betonarme döşemelerde metalik (çelik veya amorf metal) fiber kullanımının etriye ve kayma çivisi kullanımına göre zımbalama dayanımı ve maksimum yer değiştirmeleri daha yüksek oranda arttırdığını bulmuşlardır. Barros vd.…”

Section: Gi̇ri̇ş (Introduction)unclassified

Çelik fiber katkısının farklı boyuna donatı oranına sahip betonarme döşemelerin zımbalama davranışı üzerinde etkileri

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et al. 2018

Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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Eight slabs with two different longitudinal reinforcement ratios and varying steel fiber ratios were tested  Steel fibers increased the ultimate load capacity for all slabs  Contribution of steel fibers to the displacement capacity was more significant for slabs with higher longitudinal reinforcement ratio Addition of steel fibers in concrete mixture is known to increase the punching resistance of slabs. There are numerous studies, both analytical and experimental, in the literature investigating the effects of steel fibers on the punching behavior of steel fiber reinforced concrete slabs. Figure A. Load-displacement curves for slabs Purpose: This study is concentrates on the effects of steel fibers on the punching behavior of reinforced concrete slabs with different longitudinal reinforcement ratios. Experimental studies on the subject were usually performed with either no or constant longitudinal reinforcement. This study aims to investigate the coupling effects of steel fibers with varying longitudinal reinforcement ratios. Theory and Methods: Reinforced concrete slabs in two groups, having 0.004 (D1 series) and 0.002 (D2 series) longitudinal reinforcement ratios in two orthogonal directions, were cast with concrete mixes containing 0%, 0.5%, 1% and 1.5% steel fiber ratios in volume. Slabs were 2150x2150x150 mm in dimensions. Eight slabs were tested in total under static loads applied at their midpoints. An analytical study of the test specimens were also performed using Critical Shear Crack Theory and based on comparisons of experimental and analytical results some improvements in the model were proposed. Results: For slabs without steel fibers, the slab with higher reinforcement ratio showed punching failure before the yielding of longitudinal bars, whereas the slab with lower reinforcement ratio displayed a significantly higher ductility before final punching failure. Addition of steel fibers increased the punching load capacity up to two times. However, although addition of steel fibers also increased the maximum displacements in D1 series slabs, it did not make any significant effect on the maximum displacements of D2 series slabs. Maximum displacements were still controlled by the yielding of longitudinal reinforcement. Increasing the steel fiber ratio increased both the punching capacity and the maximum displacements in D1 series slabs, but it did not make a significant difference in behavior of D2 series beyond 1% fiber ratio (Figure A). Conclusion: Role of steel fibers on the behavior of slabs is dependent on the longitudinal reinforcement ratio. For slabs with low reinforcement ratio, steel fibers increase the load capacity but do not have a significant effect on the displacement capacity since displacement capacity is still controlled by the yielding of the longitudinal reinforcements. For slabs with high reinforcement ratio, which do not show yielding before punching, steel fibers increase both punching capacity and displacement capacity. Increased punching capacity in these slabs allows yielding...

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Section: Gi̇ri̇ş (Introduction)unclassified

Çelik fiber katkısının farklı boyuna donatı oranına sahip betonarme döşemelerin zımbalama davranışı üzerinde etkileri

Saatcı

Yaşayanlar

et al. 2018

Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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“…The authors also proposed a calculation method for the estimation of the composite joint bending moment capacity, whose results were marginally greater than the finite-element simulations. The authors also concluded that their proposed calculation method could be used to estimate the load carrying capacity of partial depth end-plate composite joints.The second paper by Choi et al (2015) presents an investigation of the punching shear behaviour of reinforced concrete slabs with various shear reinforcements. Six slab specimens were tested focusing on the parameters: fibre type, shear reinforcement type and fibre volume fraction.…”

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confidence: 99%

“…The second paper by Choi et al (2015) presents an investigation of the punching shear behaviour of reinforced concrete slabs with various shear reinforcements. Six slab specimens were tested focusing on the parameters: fibre type, shear reinforcement type and fibre volume fraction.…”

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confidence: 99%

Editorial

Vellasco¹

2015

Proceedings of the Institution of Civil Engineers - Structures

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This issue of Structures and Buildings consists of five technical papers and a book review. The first paper, by Hejazi and Azadbakht (2015), examines the structural response of partial depth end-plate with a precast hollowcore slab semi-rigid composite joints. A numerical non-linear finite-element analysis was performed and showed that the partial depth end-plate thickness had a substantial effect on the joint's flexural capacity. The authors also proposed a calculation method for the estimation of the composite joint bending moment capacity, whose results were marginally greater than the finite-element simulations. The authors also concluded that their proposed calculation method could be used to estimate the load carrying capacity of partial depth end-plate composite joints.The second paper by Choi et al. (2015) presents an investigation of the punching shear behaviour of reinforced concrete slabs with various shear reinforcements. Six slab specimens were tested focusing on the parameters: fibre type, shear reinforcement type and fibre volume fraction. The tests utilised conventional steel fibres, amorphous metallic fibres, stirrups and stud rails to be used as shear reinforcement while fibre volume fractions were incorporated into the concrete mixture. The results indicated that, in the case of slabs subjected to direct shear, the adoption of amorphous metallic fibres can enhance the test's ultimate load and associated deflections. These results were also compared to the current design codes predictions and strength models leading to the development of a resistance model for estimating the punching shear capacity of concrete using amorphous metallic fibres.The third paper by Fattah et al. (2015) reports on a case study using finite-element software to investigate the dynamic analysis and structural design of a machine foundation on piles in homogeneous sandy soil. The study concentrated on foundation geometry, dynamic load amplitude and frequency, and damping ratio. The investigation also assessed the effect of pile diameter, spacing between piles, cap thickness and cap length over the pile foundation structural response. Normalised factors were also introduced to provide designers with a distinct view of the settlement and moments induced in the pile cap.The fourth paper by Ho (2015) presents a simple alternative for pattern load analyses of arbitrary multiple-way spanning floor systems. The author claims that the procedure was conceived to work with existing commercial software packages providing more realistic predictions of structural members design loads. The proposed method was based on the influence line concept and simply encompasses additions and multiples of the absolute sum of basic linear static analyses results.The fifth paper by Arya et al. (2015) describes a model for estimating the sustainability of bridges using the indictors of climate change, resource use, waste, biodiversity and heritage, noise, dust, vibration, aesthetics, employment and businesses, construction costs, maintenance costs a...

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