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Two-way (punching) Shear Calculations Two-way (punching) shear calculations are performed to ensure that the concrete slab design shear strength,vn,shall be greater than or equal to the factored shear stress,vu.vvn u The combined two-way (punching) shear stress,vu,is calculated as the summation of direct shear alone andTitle No.115-S11 Punching Shear Strength of Slabs and tions for punching shear have not been sufficiently verified for cases of slabs with low reinforcement ratios where flex-ural failure under punching load may occur ahead of the normal punching shear failure.One typical way to treat this lightly reinforced slab case in practice is to calculate the punching strength of the slabTitle No.115-S11 Punching Shear Strength of Slabs and tions for punching shear have not been sufficiently verified for cases of slabs with low reinforcement ratios where flex-ural failure under punching load may occur ahead of the normal punching shear failure.One typical way to treat this lightly reinforced slab case in practice is to calculate the punching strength of the slab

Inspired with the well-established critical shear crack theory,a punching shear mechanical model for LW concrete slabs was developed,validated,and proposed.In addition,using the proposed model,a parametric study was conducted in order to investigate the effect of concrete density,slab depth,flexure reinforcement ratio on the strength Some results are removed in response to a notice of local law requirement.For more information,please see here.Previous123456NextAlternative for Concentric Punching Capacity Evaluation of Alternative for Concentric Punching Capacity Evaluation of Reinforced Concrete Two-Way Slabs.The Tureyen-Frosch one-way shear design rationally accounts for the effect of the longitudinal reinforcement stiffness on the shear strength of rectangular concrete beams without transverse reinforcement.Some results are removed in response to a notice of local law requirement.For more information,please see here.12345NextStrength and ductility of lightweight reinforced concrete Inspired with the well-established critical shear crack theory,a punching shear mechanical model for LW concrete slabs was developed,validated,and proposed.In addition,using the proposed model,a parametric study was conducted in order to investigate the effect of concrete density,slab depth,flexure reinforcement ratio on the strength

Reinforcement Ratio Effect and Interaction Between Shear and FlexurePunching of Slabs with Low Reinforcement Ratios and The Issue of DuctilitySize EffectReferencesThe absence of a term is often cited as a major deficiency by those who claim that the ACI 318 equation does not predict the punching shear capacities of test slabs as accurately as other equations that explicitly include this variable.This claim is,however,unfounded.Alexander and Hawkins (2005) reminded the profession that the ACI 318 equation was never intended to be used as a shear capacity predictor.Instead,it is a design equation aimed at precluding a brittle punching shear faiSee more on structuremag(PDF) Punching Shear Strength of Reinforced Concrete Slabs Jul 01,2008 Concentric Punching Shear Strength of Reinforced#0183;Punching Shear Strength of Reinforced Concrete Slabs without Transverse Reinforcement.July 2008; Aci Structural Journal 105(4) concentric ringsPunching-Shear Strength of Normal and High-Strength Two Dec 06,2013 Concentric Punching Shear Strength of Reinforced#0183;Despite the 60 MPa limit of the Canadian standard punching-shear equation,it yielded good predictions for specimens with concrete strengths of 7175.8 MPa.

Results of several tests indicate that the punching resistance of reinforced concrete flat slabs without shear reinforcement is mainly influenced by the compressive strength of concrete (f c),the tensile flexural reinforcement ratio (),the size and geometry of the column and also the size effect () which is a coefficient that takes into Punching strength of reinforced concrete flat slabs Punching strength of reinforced concrete flat slabs without shear reinforcement formation of bending and shear cracks to divide the slab into seg-ments,and,assuming that the region external to the punching cone presented rigid body rotations around a point away by a distance x (height of the slabs neutral axis) either vertically and horizon-Punching shear strength of reinforced concrete flatPunching shear strength of reinforced concrete at slabs subjected to re on their tension sides Hamed Salem a,*,Heba Issa a,Hatem Gheith b,Ahmed Farahat a a Structural Engineering Dept.,Cairo University,Giza,Egypt b Housing and Building Research Institute,Giza,Egypt Received 12 September 2011; accepted 30 October 2011

Punching shear strength of reinforced concrete at slabs subjected to re on their tension sides Hamed Salem a,*,Heba Issa a,Hatem Gheith b,Ahmed Farahat a a Structural Engineering Dept.,Cairo University,Giza,Egypt b Housing and Building Research Institute,Giza,Egypt Received 12 September 2011; accepted 30 October 2011Punching shear design of RC flat slabs supported on wall Reinforced concrete buildings are typically braced with shear walls positioned around lift shafts and stairs.Vertical transfer of load from slab to walls leads to a concentration of shear stress in the slab at wall ends and corners,which needs to be considered in punching shear design.Punching of High Strength Concrete Flat Slabs without and another one with normal strength concrete (NSC),under concentric and monotonic increasing punching load.The concrete strength used ranged between 35.9 MPa (NSC) and 130.1 MPa (HSC),while the average longitudinal reinforcement ratios varied between 0.94% and 1.48%.The reduced scale specimens measured 1650 x1650 mm2,

Hallgren M.Punching shear capacity of reinforced high strength concrete slabs.Doctoral thesis.Stockholm Royal Institute of Technology; 1996.206 pp.Ramdane KE.Punching shear of high performance concrete slabs.In 4thinternational symposium on utilization of high- strength/high-performance concrete,Paris; 1996.p.101526.Vargas ENZ.Punching of High Strength Concrete Flat Slabs without Hallgren M.Punching shear capacity of reinforced high strength concrete slabs.Doctoral thesis.Stockholm Royal Institute of Technology; 1996.206 pp.Ramdane KE.Punching shear of high performance concrete slabs.In 4thinternational symposium on utilization of high- strength/high-performance concrete,Paris; 1996.p.101526.Vargas ENZ.Punching Shear Capacity of Fibre Reinforced ConcretePunching Shear Capacity of Fibre Reinforced Concrete Slabs with Conventional Reinforcement design value of the flexural strength of the steel fibre reinforced concrete .f .f ctR,u.design value of the post-cracking tensile strength at the ultimate limit state,according to DAfStB .f.cc.

combination of one-way shear and two-way shear.2.Bond Model for concentric punching shear The Bond Model for concentric punching shear [8,9] is a mechanical model for slab-column connections that explains the load transfer between plate and column by combining radial arching action and the concept of a critical shear stress,as used for beamPredicting the Shear Capacity of Reinforced Concretecombination of one-way shear and two-way shear.2.Bond Model for concentric punching shear The Bond Model for concentric punching shear [8,9] is a mechanical model for slab-column connections that explains the load transfer between plate and column by combining radial arching action and the concept of a critical shear stress,as used for beamPerformance of reinforced concrete slabs under punching Jun 23,2020 Concentric Punching Shear Strength of Reinforced#0183;The experimental program of this study consisted of 12 slab specimens.The parameters investigated include ratio of reinforcement in compression and tension,amount of shear reinforcement and arrangement of shear reinforcement.Flexural reinforcement ratio especially in tension had a noticeable effect on the mode of failure and ultimate punching capacity of slabs.

Jun 23,2020 Concentric Punching Shear Strength of Reinforced#0183;The experimental program of this study consisted of 12 slab specimens.The parameters investigated include ratio of reinforcement in compression and tension,amount of shear reinforcement and arrangement of shear reinforcement.Flexural reinforcement ratio especially in tension had a noticeable effect on the mode of failure and ultimate punching capacity of slabs.Improving the Punching Shear Strength of RC Slabs byconcentric.El-Salakawy et al.[2] investigated the effect of shear bars or shear bolts in the punching strength and the deformation capacity of the connections and ductility due to transferring of the failure mode from the punching to flexural.Esfahani et al.[3] studied the punching shear strengthening of RC flat slabs using CFRPEffect of premature loading on punching resistance of Jun 01,2020 Concentric Punching Shear Strength of Reinforced#0183;1.Introduction.The first use of reinforced-concrete flat slabs,supported solely on columns,dates back to the early twentieth century [].Over the years,researchers reported that the significant parameters influencing the punching strength of slabs are primarily the compressive strength of concrete,reinforcement ratio,size and geometry of columns,and effective depth of the

ARCH 331 Note Set 27.2 F2010abn 3 6) Check transfer of load from column to footing ACI 15.8 a) Find load transferred by bearing on concrete in column ACI 10.17 basic P n 0.85 f c A 1 where = 0.65 and A 1 is the area of the column with confinement 1 2 0.85 1 A A P n f c A where 1 2 AConsideration on punching shear strength of steel-fiber A total of 91 shear test data on steel-fiber-reinforced concrete slabcolumn connection were compared to the analysis results,and the proposed model provided a good accuracy on estimating the punching shear strength of the steel-fiber-reinforced concrete flat slabs.Consideration on punching shear strength of steel-fiber A total of 91 shear test data on steel-fiber-reinforced concrete slabcolumn connection were compared to the analysis results,and the proposed model provided a good accuracy on estimating the punching shear strength of the steel-fiber-reinforced concrete flat slabs.

Flat slabs are very popular and economical floor systems in the construction industry.These floor systems,supported directly on columns,are known to be susceptible to punching shear in the vicinity of the slab-column connection.The punching shear provisions of AS 3600-2009,the current Australian Concrete Structures Standard,for the case of concentric loading are based on empirical Concentric Punching Shear Strength of ReinforcedAS 3600-2009 only recognises shearheads as an effective shear reinforcement to increase the concentric punching shear strength of slabs,and it does not cover more practical types of reinforcement such as shear studs and stirrups unlike most ofCited by 13Publish Year 2013Author Mohamed Hassan,Ehab A Ahmed,Brahim BenmokranePunching Shear Strength of Reinforced Concrete Slabs structures,shear and punching shear,fiber-reinforced high-strength concrete,soil-structure interaction,and the conceptual design of bridges.Fig.1Plots of load-rotation curves for tests by Kinnunen and Nylander8 (geometric and mechanical parameters of tests defined in Fig.8).

Abstract The current research aims to study the behavior of thin reinforced concrete (RC) slabs under concentrated loads as well as to investigate the application of Critical Shear Crack Theory (CSCT) to such slabs.For this purpose,four square 100-mm-thick slabs were cast and subjected to concentrated punching monotonic loading.The experimental parameters were the flexural reinforcement Author Aurelio MuttoniReinforced Rectangular Concentric Concrete Footing Design Jul 24,2019 Concentric Punching Shear Strength of Reinforced#0183;Reinforced Rectangular Concentric Concrete Footing Design Spreadsheet General Description Calculates the reinforcement required for a reinforced rectangular or square concrete footing with a rectangular or square columns at the centre of the footing,for flexure and checks 1 way and 2 way shear at the concrete column,using ductility class N Alternative for Concentric Punching Capacity Evaluation of Alternative for Concentric Punching Capacity Evaluation of Reinforced Concrete Two-Way Slabs.The Tureyen-Frosch one-way shear design rationally accounts for the effect of the longitudinal reinforcement stiffness on the shear strength of rectangular concrete beams without transverse reinforcement.

On the other hand,the punching shear strength 82 provision of Eurocode 2,which is based on Model Code 1990 [18],is depended on the 83 flexural reinforcement ratio [17].Formulations to evaluate the punching shear capacity of 84 slabs reinforced with different types of punching shear reinforcement can also be found in 85 codes of practice ACI STRUCTURAL JOURNAL TECHNICAL PAPERin punching shear4,5 is (5) Concentric punching shear capacity with shear reinforcement The CSA and ACI standards4,5 permit the use of closed stirrups or vertical shear studs as shear reinforcement that are positioned prior to casting and are typically located along perimeters that parallel the column periphery (Fig.3).(PDF) Punching Shear Capacity of Interior SFRC SlabThe paper deals with the punching shear behavior and the capacity of interior steel fiber-reinforced concrete (SFRC) slab-column connections.In the experimental study,the effect of the amount of

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