Ancon shearfix punching shear reinforcement system used within a slab to provide additional reinforcement around columns, ancon shearfix provides an ideal solution to the design and construction problems associated with punching shear. Punching shear reinforcement 7 punching shear resistance with doubleheaded anchors 8 design in the area c or 0. The program is able to analyse both plain and reinforced concrete structures. Punching shear how to design against punching shear forces. If punching ratio of column on raft foundation 30 thick is 1. Safe punching shear problem software issues structural. Design example of punching shear in slabs eurocode 2.
Ed, is to be controlled at the critical section, as described in section 2. Design software in etaconform version concrete plant precast. Decon studrails are a proven, costeffective solution to resist punching shear at slabcolumn connections in elevated slabs and foundation mat slabs, as well as bursting stresses in posttension anchorage zones. The filigran punchingshearreinforcement fdb is the second generation of punching shear reinforcement that has been optimised for flat slabs using the filigran construction method. There are many reinforcement solutions available for increasing the punching shear capacity, such as bentup bars, stirrups, double headed shear studs, structural steel shear heads, shear bands. To determine the, the average soil pressure should be determined in the maximum loads stripes. It is mainly used to increase the punching shear capacity of elevated concrete slabs and slabs on grade without increasing their thickness. Punching shear design according to eurocode 2 in rfem. If the maximum punching shear stress calculated does not exceed the allowable value, the section is considered safe. The shear load from the slab is transferred through the.
Let us take a look at a 2500mm thick pile cap supported with 5 numbers of piles in figure 1. Pointdisplacement load assignment is available for support conditions. The calculations are done in accordance with bs en 1992. There are many reinforcement solutions available for increasing the punching shear capacity, such as bentup bars, stirrups, double headed shear. Jul, 2016 two way punching shear concept explained and flat plate example csa a23. Introduction to punching shear reinforcement 4 advantages of the jordahl punching shear reinforcement jda 5 design according to eta6 6 9 summary of proofs 6 round cut guide 6 design load 7 punching shear resistance without punching shear reinforcement 7 punching shear resistance with doubleheaded anchors 8. Optional consideration of minimum moments according to en 1992. Punching shear checks for walls, point loads, and nonconcrete columns.
Basic principles 9 14 pointload supported slabs 9 design concept 10combination of system elements 15 combinations of hdb. Halfen hdb punching shear and shear reinforcement 4 7 hdb punching shear reinforcement 5 hdbs shear reinforcement 6 product overview 8 halfen hdb as punching shear and shear reinforcement 8 calculation. Punching shear reinforcement filigran tragersysteme gmbh. This paper summarizes the results of 39 punching tests and compares the punching shear resistances obtained from the tests with the punching shear capacity of flat slabs without punching shear reinforcement according to aci 31814 and eurocode 2 along with the german annex. Punching strength with shear reinforcement firstly, one has to check if the design shear. 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 structura. The fdb enables punching loads that are more than doubled factor 2. Due to the specially designed shape multi lowslip anchorage points in the concrete a component reinforced with hdbz up to 100 % more load capacity than a foundation without punching shear. There are generally 4 methods used to overcome shear failure in general. Punchingshear faq safe computers and structures, inc. Punching shear resistance with punching shear reinforcement. If necessary, safe designs tie and shear stud punching reinforcement.
If the design of v rd,max was performed successfully, the required punching shear reinforcement is determined in the next step. 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. With better material properties than studs from smooth bars, armata provides more efficient design against punching shear failure in flat slabs peikkos armata is primarily used to increase the punching shear resistance of castinsitu concrete slabs without. Hdbf punching shear reinforcement in element slabs 28 29 tender speci. Punching shear how to design against punching shear. This is a shear stud rail system, sometimes called ssr on drawings. The new halfen hdbz punching shear reinforcement now allows an even more efficient and economic design of foundation slabs and single foundations. Aug 14, 2018 in the safe interface, click the displayshow punching shear design and the punching shear capacity ratios shear reinforcement will be displayed.
Pdf alternative punching shear reinforcement for rc flat. The punching shear capacity in slabs without punching shear reinforcement. This criterion correctly describes punching shear failures. The latest version of ancons shearfix software is 5. This paper summarizes the results of 39 punching tests and compares the punching shear resistances obtained from the tests with the punching shear capacity of flat slabs without punching shear reinforcement according to aci 31814. Punching shear reinforcement jdaftkl jordahl jordahl. For the ystrips, csy4 have maximum shear value in c4. Create punching shear checks tekla structural designer user. Punching program for verification of punching shear resistance of concrete slabs according to en 199211 and en 19922. Design room linkstudpsr specialists in punching shear. Armata punching reinforcement is the first icc approved doubleheaded shear rail system made from deformed reinforced bars. From the above discussion we can see that the providing the shear reinforcement is the best method to solve the problem of punching shear. Punchingshear force vu should be smaller than the column reaction, and similar to the value of column reaction minus column weight and load within the shear perimeter. Structural analysis software rfem and rfpunch pro addon module for punching shear design of reinforced concrete surfaces acc.
With better material properties than studs from smooth bars, armata provides more efficient design against punching shear failure in flat slabs. The problem of punching shear, which is critical for this type of construction, can be resolved cost efficiently and dependably with the reinforcement bar schock bole. Momentrelease and rigidzone options define kinematic relations where vertical and slab systems interconnect. The system consists of doubleheaded studs welded to flat rails, positioned around the column head or base. Dsa punching reinforcement is a shear rail system approved by icc evaluation service. When you apply a punching shear check to a point load, you must manually define the punching shear check z axis orientation. Punching shear capacity in slabs without punching shear reinforcement.
Jul 17, 2014 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. By simplifying slab reinforcement at column locations and eliminating column capitals, stirrup cages, or i beam shear heads. Punching shear strength of reinforced concrete slabs without. Punching shear reinforcement asnzs aunz code issues. Jordahl expert software for punching shear reinforcement. Safe technical knowledge base computers and structures, inc. Pdf alternative punching shear reinforcement for rc flat slabs. A mechanical explanation of the phenomenon of punching shear in slabs without transverse reinforcement is presented on the basis of the opening of a critical shear crack. If the hypothetical maximum punching shear stress exceeds the allowable value by a moderate amount, punching shear reinforcement may be provided to bring the. There are a couple of reasons the results in adaptfloor pro may differ, specifically to the ec2 code. Free software is available from ancon that simplifies the design of punching shear reinforcement.
The jordahl expert punching shear reinforcement jda is used to design flat slabs, ground slabs, precast slabs and footings. Two way punching shear concept explained and flat plate example csa a23. The schock bole is a punching shear reinforcement consisting of doubleheaded studs and anchors with spacing bars to secure correct positioning. Easy to use application for analysis of punching shear of reinforced concrete columnslab connection. The studs are welded to the rail at centres determined by. Another solution, if the concrete shape is not fixed, would be to add a drop panel to the soffit of the beam at the support as you would do for a flat slab but only for the width of the beam, not l3. Punching strength without shear reinforcement the punching shear strength of the concrete is not sufficient. The concrete shear strength in oneway action is defined by the expression. If users introduce additional punching shear reinforcement, the program verifies the behaviour of the reinforcement distribution in accordance with the selected code. Your flexural shear reinforcement will be full width of the beam but you should only consider that which is in the punching zone. Aug 06, 2019 the two axis systems are locked together, so if the column is rotated, the punching check axes also rotate. For the flat slab with the general arrangement as shown below, let us design the punching shear for column b1 given the following design information.
Punching shear reinforcement design program ancon ltd. Structural design of raft foundation pe civil exam. Efficiency of various punching shear reinforcement systems. Punching shear analysis of reinforced concrete flat plates. Used within a slab to provide additional reinforcement around columns, ancon shearfix is the ideal solution to the design and construction problems associated with punching shear. Aside from flexural checks, one of the most important points to consider in the design of the pile cap is the punching shear checks. Punching shear designer, reinforced concrete slabs cads uk. The ancon design program simplifies the specification and ordering of a shearfix system. The linkstudpsr system is the only punching shear reinforcement system. Punching shear in beam structural engineering general. Punching shear safe 2016 tutorial example and practical. 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 punching shear design. Calculate the required asw shear reinforcement for n perimeter check if the punching shear stress at the loaded area face v exceeds 0. It is possible that punching shear failures can occur around walls especially walls with a short length.
Ancon shearfix punching shear reinforcement system used within a slab to provide additional reinforcement around columns, ancon shearfix provides an ideal solution to the design and construction problems associated with punching shear related links. On the other hand, a limited number of analytical work is done using selfdeveloped programs, commercial software, or by utilizing mathematical model. Integration of design software by the halfen shear reinforcement rails producer. A sw area of shear reinforcement in one perimeter around the column subject to a sw,min s r radial spacing of perimeters of shear reinforcement. Max frank offer a punching shear reinforcement customised design program which automatically calculates the most costeffective design solution for.
As far as i can see the only methods referenced in as3600 to increase shear capacity is the use of a shear head with no guidance given, or provide closed ties in. On the other hand, the punching shear strength depends of the column location on the footing, either interior, edge or corner, per the expression. So for effective control of punching shear the design is necessary. Punching stresses generally arises when a concentrated load is applied to a small area of slab. Halfen punching shear reinforcement and shear reinforcement. The latest version of ancons shearfix software is 4. Unbalanced moments mu2 and mu3 should be similar to the column moments at the top of the column times the reduction factor aci 318 gama v. You can do this in the properties window by specifying the point load orientation in relation to the global y axis. Linkstudpsr is the new and definitive solution to the problem of punching shear in concrete structures, providing the ultimate in fast, simple and highly costeffective reinforcement. I have never yet had to deal with punching shear reinforcement as i usually prefer to increase the slab depth or provide a drop panel, but in this particular job it cant be achieved. It leads to the formulation of a new failure criterion for punching shear based on the rotation of a slab.
Punching shear checks in pile caps the structural world. Numerical and graphical display of results 3d, 2d, and in sections punching shear design with or without punching shear reinforcement. Cads punching shear designer is a software application which performs rapid and costeffective design solution of punching shear calculations for reinforced concrete flat slab structures. What are the solutions for punching shear failures in a. The required punching shear reinforcement is calculated according to the adjusted expression 6. Feb 06, 2019 in this video, we investigate how to analyze a slab for punching shear, how to design rebar and stud rails, and some theory, tips and tricks. When using the ec2 code in adaptfloor pro 2009, the punching shear reinforcement appears to be excessive when compared with other thirdparty software, why is this.
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