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Punching shear strengthening of flat slabs using

What is Punching Shear? Punching Shear in Flat Slabs

Oct 23,2017 Punching shear strengthening of flat slabs using#0183;Correct Representation of Punching Shear Failure.Punching shear is a phenomenon in flat slabs caused by concentrated support reactions inducing a cone shaped perforation starting from the top surface of the slab.Although generally preceded by flexural failure,punching shear is a brittle failure mode and the risk of progressive collapse requires a higher safety class in structural design.Strengthening of flat slabs against punching shear using A significant number of existing flat slabs currently require strengthening against punching shear for safety reasons (the increase of applied loads and deficiencies during design or construction) or to comply with more stringent code requirements.Available strengthening methods are,however,not completely satisfactory,or they cannot be applied in many cases (depending on the possibilities Strengthening of Flat Slabs Against Punching Shearincrease both on the punching shear resistance (ensuring Title no.107-S43 Strengthening of Flat Slabs Against Punching Shear Using Post-Installed Shear Reinforcement by Miguel Fern Punching shear strengthening of flat slabs using#225;ndez Ruiz,Aurelio Muttoni,and Jakob Kunz Fig.1Collapse of parking garage flat slab at Gretzenbach (Switzerland,2004) (a) view of flat slab after collapse

Strength of Concrete Slabs in Punching Shear Journal of

A theoretical solution for the punching shear strength of a concrete slab is presented.The problem is treated as a threedimensional axisymmetrical one,the material being assumed to be rigidplastic.A failure criterion for the concrete is suggested,in which a seconddegree parabola is used for a CoulombMohr yield envelope.Slabs and Flat Slabs - Concrete Centre Punching shear e.g.flat slabs and pad foundations Shear There are three approaches to designing for shear When shear reinforcement is notrequired e.g.usually slabs When shear reinforcement isrequired e.g.Beams,see Lecture 3 Punching shear requirements e.g.flat slabs The maximum shear strength in the UK should not exceed Shear Strengthening of Interior SlabColumn Connections Sixteen square (670 Punching shear strengthening of flat slabs using#215; 670 mm) slabcolumn connections with different slab thicknesses (55 and 75 mm) and reinforcement ratios (1 and 1.5%) were tested.Twelve specimens were strengthened using CFRP sheets and the remaining four specimens were kept as controls.Without strengthening,all specimens were designed to experience punching shear

Screw Anchors Used as Post-Installed Shear Reinforcement

In paper,the new and modern strengthening system of flat slabs against punching shear using screw anchors is presented.Screw anchors are installed from lower face of the slab into vertically drilled boreholes.After the installation,the screw anchors operate as punching shear reinforcement.STRUCTURE magazine Design of Concrete Flat Slabs to This article presents an alternative method for designing concrete flat slabs subjected to flexure-induced punching.The design method meets the requirements of ACI 318-14,Building Code Requirements for Structural Concrete and Commentary,Canadian Standard CSA A23.3-14,Design of Concrete Structures,and recommendations of ACI 421.1R-08,Guide to Shear Reinforcement for Slabs,and ACI 421.2R STRUCTURE magazine Addressing Punching FailureWith the use of higher strength steels and higher strength concretes,many flat slabs now have Punching shear strengthening of flat slabs usinglt; 1%.The fact that a slab with low can fail at a shear stress less than 4 may seem to create the need for a new equation for V n .

STRENGTHENING OF REINFORCED CONCRETE SLABS

Key words Strengthening,post-tension,bonding,reinforced concrete,flat slabs,punching shear Abstract Strengthening of concrete slabs by means of post-tensioning is a very effective method regarding ultimate and serviceability limit states.Nevertheless the traditional post-tensioning method uses external permanent anchorages that canRelated searches for Punching shear strengthening of flat spunching shear slabslab on grade punching shearpunching shear in concrete slabslab punching shear calculationconcrete punching shearwhat is punching shearpunching shear reinforcementpunching shear footingSome results are removed in response to a notice of local law requirement.For more information,please see here.Previous123456NextImproving the Punching Shear Strength of RC Slabs byet al.[3] studied the punching shear strengthening of RC flat slabs using CFRP sheets located at the tension side of the slabs.They found that the punching shear strength of slabs can be increased by using of CFRP sheets,in addition to steel reinforcing bars,as flexural reinforcement.Stark et al.[4]Related searches for Punching shear strengthening of flat spunching shear slabslab on grade punching shearpunching shear in concrete slabslab punching shear calculationconcrete punching shearwhat is punching shearpunching shear reinforcementpunching shear footingSome results are removed in response to a notice of local law requirement.For more information,please see here.

Punching shear strengthening of flat slabs using

Oct 01,2014 Punching shear strengthening of flat slabs using#0183;Several concepts exist for the strengthening of flat slabs against punching shear such as a widening of the slab support with concrete mushrooms or steel heads ,.In addition,the flexural resistance of the slab can be increased with an external reinforcement made of steel or new materials like fiber-reinforced polymer (FRP) composites [6 Punching shear resistance of strengthened reinforced Ruiz,MF,Muttoni,A,Kunz,J (2010) Strengthening of flat slabs against punching shear using post-installed shear reinforcement.ACI Structural Journal 107 434 442 .Google ScholarPunching of flat slabs Design examplePunching strength without shear reinforcement The punching shear strength of the concrete is not sufficient.Consequently,shear reinforcement is necessary.1642 204 10 367 kN 661kN 1.5 30 0.300 3,0 = = = = v d c ck Rd c b d V f V k Punching strength with shear reinforcement Firstly,one has to check if the design shear

Punching of flat slabs Design example

Punching strength without shear reinforcement The punching shear strength of the concrete is not sufficient.Consequently,shear reinforcement is necessary.1642 204 10 367 kN 661kN 1.5 30 0.300 3,0 = = = = v d c ck Rd c b d V f V k Punching strength with shear reinforcement Firstly,one has to check if the design shear Punching of High Strength Concrete Flat Slabs without punching behavior of high strength concrete (HSC) flat slabs is reported in the present work.Three flat slab specimens were cast using HSC and another one with normal strength concrete (NSC),to be used as a reference slab.The HSC mix presented a compressive strength of about 130 MPa,with a basalt coarse aggregate.The tested specimens were Punching Shear Strengthening of Two-Way Flat Slabs with Apr 02,2014 Punching shear strengthening of flat slabs using#0183;The dominant failure mode for flat slabs strengthened with FRP grids is found to be deboning of FRP grids due to the small slab depth.In addition to the increased shear capacity of the slab up to a reasonable value,this method of strengthening is capable of changing slab failure from the shear mode to the flexure mode.

Punching Shear Strengthening of Two-Way Flat Slabs with

Apr 02,2014 Punching shear strengthening of flat slabs using#0183;The dominant failure mode for flat slabs strengthened with FRP grids is found to be deboning of FRP grids due to the small slab depth.In addition to the increased shear capacity of the slab up to a reasonable value,this method of strengthening is capable of changing slab failure from the shear mode to the flexure mode.Performance of slab-column connections of flat slabs Dec 01,2019 Punching shear strengthening of flat slabs using#0183;The behavior of slab-column connections retrofitted with alternative arrangements of externally attached CFRP was studied.Ten flat slab specimens of size 1200 mm Punching shear strengthening of flat slabs using#215; 1200 mm Punching shear strengthening of flat slabs using#215; 100 mm were prepared with a center stub column connected monolithically to the slab.Two specimens were kept as non-strengthened control specimens and others were strengthened against punching shear usingPeople also askWhat is a punching shear?What is a punching shear?Punching Shear in Flat Slabs.Punching shear is a type of failure of reinforced concrete slabs subjected to high localized forces.In flat slab structures this occurs at column support points.The failure is due to shear.This type of failure is catastrophic because no visible signs are shown prior to failure.What is Punching Shear? Punching Shear in Flat Slabs

PUNCHING OF FLAT SLABS WITH SHEAR

punching shear with transverse reinforcement is summarized in Chapter 2.Currently,none of the resulting theories explains the behavior of the strength of punching shear of flat slabs with transverse reinforcement physically satisfactorily.Improving the Punching Shear Strength of RC Slabs byet al.[3] studied the punching shear strengthening of RC flat slabs using CFRP sheets located at the tension side of the slabs.They found that the punching shear strength of slabs can be increased by using of CFRP sheets,in addition to steel reinforcing bars,as flexural reinforcement.Stark et al.[4]Flat slab strengthening techniques against punching-shear Feb 01,2019 Punching shear strengthening of flat slabs using#0183;Strengthening techniques against punching of R/C flat slabs could be grouped into four types shear strengthening,flexural strengthening,enlargement of the support and post-tensioning systems.Shear strengthening represents one of the first strengthening technique against punching investigated by the researchers,it is performed through the

Flat slab strengthening techniques against punching-shear

Feb 01,2019 Punching shear strengthening of flat slabs using#0183;Strengthening techniques against punching of R/C flat slabs could be grouped into four types shear strengthening,flexural strengthening,enlargement of the support and post-tensioning systems.Shear strengthening represents one of the first strengthening technique against punching investigated by the researchers,it is performed through the FLATSLAB STRENGHTENING TECHNIQUES AGAINSTStrengthening techniques against punching of R/C flatslabs could be grouped into four types shear strengthening,flexural strengthening,enlargement of the support and posttensioning systems.Shear strengthening represents one of the first strengthening technique against punching investigated by the researchers,it is performed through Effect of premature loading on punching resistance of Jun 01,2020 Punching shear strengthening of flat slabs using#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 slab

Designing for Punching Shear in Concrete Slabs

Apr 28,2020 Punching shear strengthening of flat slabs using#0183;Where v Ed = applied punching shear stress ; v Rd,max = maximum concrete shear strength; f ck = is the characteristic concrete strength.; V Ed = applied punching force; is a factor that deals with the eccentricity of the applied loads.Its value is defined in clause 6.4.3 of BS EN 1992-1-1.However,for structures where the lateral stability does not rely on the frame action between the Design Considerations for Shear Bolts in Punching Shear This study addresses design aspects for the punching shear bolt retrofitting system for reinforced concrete flat slabs supported on columns.Shear bolts are an external type of reinforcement installed in existing slabs by first drilling small holes through the slab thickness,installing the bolts into them,and tightening the bolt nuts.Design Considerations for Shear Bolts in Punching Shear This study addresses design aspects for the punching shear bolt retrofitting system for reinforced concrete flat slabs supported on columns.Shear bolts are an external type of reinforcement installed in existing slabs by first drilling small holes through the slab thickness,installing the bolts into them,and tightening the bolt nuts.

Concrete Floors And Slabs - icevirtuallibrary

Jul 07,2015 Punching shear strengthening of flat slabs using#0183;The paper focuses on punching shear design of slabs with openings and supported on rectangular columns.Twenty slab specimens had been tested in the programme and it was found as expected that the stresses in the slabs are concentrated mostly around the shorter ends of the rectangular columns.Concentric Punching Shear Strength of ReinforcedIn this thesis,the available methods for calculating concentric punching shear strength of slabs are reviewed.The analytical basis of previous work by other researchers was used to propose a formula to calculate the punching shear strength of flat plates with good accuracy for a wideCited by 9Publish Year 2019Author Massimo Lapi,Ant Punching shear strengthening of flat slabs using#243;nio Pinho Ramos,Maurizio OrlandoPunching of High Strength Concrete Flat Slabs without In 1996,Ramdane[5] tested 6 circular slabs,125 mm thick and 1700 mm diameter,to study the punching behavior of HSC flat slabs without shear reinforcement.Slabs were made using concrete with a compressive strength between 61 and 102 MPa

Cited by 31Publish Year 2013Author M.Hasan Meisami,Davood Mostofinejad,Hikaru NakamuraStrengthening of Flat Slabs Against Punching Shear Using

A significant number of existing flat slabs currently require strengthening against punching shear for safety reasons (the increase of applied loads and deficiencies during design or construction Cited by 1Publish Year 2019Author Rojin Azizi,Sayed Behzad TalaeitabaPunching shear strengthening of two-way flat slabs using May 01,2013 Punching shear strengthening of flat slabs using#0183;Furthermore,the failure mechanism of punching shear after strengthening is studied and an expression is developed for predicting the punching shear capacity of two-way flat slabs strengthened with CFRP rods.2.Experimental program 2.1.Test specimensCited by 14Publish Year 2014Author Robert Koppitz,Albin Kenel,Thomas KellerPunching shear strengthening of flat slabs with CFRP on Feb 18,2019 Punching shear strengthening of flat slabs using#0183;The main objective of this study is strengthening of flat slabs in punching shear with a new model.For this purpose 15 numerical samples include a control and 14 strengthened defined and nonlinearly analyzed up to failure.The strengthening method is new method of grooving in two orthogonal direction (x and y axes of slab plan) and then mounting the external bars (sticking) in one

Author Shembade Kiran TukaramPublish Year 2017Related searches for Punching shear strengthening of flat s

punching shear slabslab on grade punching shearpunching shear in concrete slabslab punching shear calculationconcrete punching shearwhat is punching shearpunching shear reinforcementpunching shear footingSome results are removed in response to a notice of local law requirement.For more information,please see here.12345NextPunching of High Strength Concrete Flat Slabs without In 1996,Ramdane[5] tested 6 circular slabs,125 mm thick and 1700 mm diameter,to study the punching behavior of HSC flat slabs without shear reinforcement.Slabs were made using concrete with a compressive strength between 61 and 102 MPa(PDF) Repair and Strengthening of R.C Flat Slab Connection Aims Study the repair and strengthening of the flat slab-edge column connections against punching shear.Study Design Parametric study is carried out by varying the repair and strengthening (PDF) Punching shear strength of UHPFRC-RC composite flat A punching shear strength mechanical model for RC flat slabs with and without shear reinforcement,based on a beam shear model previously developed by the authors,is presented.

results for this questionWhat is flat plate punching shear failure?What is flat plate punching shear failure?A typical flat plate punching shear failure is characterized by the slab failing at the intersection point of the column.This results in the column breaking through the portion of the surrounding slab.What is Punching Shear? Punching Shear in Flat Slabs results for this questionWhat is a flat slab failure?What is a flat slab failure?Flat Slab Failure due to Punching shear.A typical flat plate punching shear failure is characterized by the slab failing at the intersection point of the column.This results in the column breaking through the portion of the surrounding slab.What is Punching Shear? Punching Shear in Flat Slabs results for this questionFeedbackStrengthening of flat slabs with FRP fan for punching shear

The main objective of this study is strengthening of flat slabs in punching shear with a new model.For this purpose 15 numerical samples include a control and 14 strengthened defined and

results for this questionCan punching shear be prevented?Can punching shear be prevented?It can be used to develop an analytical model for the punching shear failure analysis of reinforced concrete plates.Furthermore,it has been discovered that punching shear can be prevented by increasing the depth of the concrete floor slabs,or by increasing the diameter of the columns supporting the floor.What is Punching Shear? Punching Shear in Flat Slabs

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