+ Punching Shear Reinforcement

Punching shear reinforcement DE+DKD

The efficient solution for increasing the punching shear resistance of reinforced concrete slabs
DE DKD web scaled

Punching shear elements DE increase the punching shear resistance of slabs supported directly by columns. If higher punching shear resistance is required, the punching shear elements DE are combined with double-headed studs DKD.

Punching shear reinforcement DE+DKD

Benefits

  • Easy installation without time-consuming inserting
  • Dual function as punching shear reinforcement and spacer
  • Common element heights readily available in stock
  • Certificates and registration in Austria and the Czech Republic
  • Design is based on EN 1992-1-1
  • Increase of the punching shear resistance of slabs
  • For slab heights from 200 to 450 mm
  • Increase of punching shear resistance up to 1.96·VRd,c
  • ALLPLAN and Revit elements for simple and efficient planning

Punching shear reinforcement DE+DKD

Application

Rendering DEDKD

Punching shear reinforcement DE+DKD

Composition

DE dimensions en
Punching shear elements DE are V-shaped mesh-like or ladderlike reinforcing elements, which are produced industrially by electric resistance welding similar to the production of reinforcing wire fabrics. The wire used for both the chords and the vertical bars is reinforcing steel B500A according to ÖNORM B 4707. These elements are manufactured in various heights and leg lengths. The vertical bars of punching shear elements DE are arranged at a small distance and provide some sort of “close stitches” to the slab section subject to punching. As a result, high shear forces in the loading area can be distributed to a very high number of thin vertical bars and, at the same time, the area subject to punching will be increased. The vertical bars are anchored in the tension and compression zone of the slab by two welding points at the double chords on top and at bottom. Transfer of forces to the flexural reinforcement is ensured by the double chords, as well.
DKD dimensions en
If required, double-headed studs provide strengthening in the area subject to the highest punching shear stress (approx. up to 1.5 × d from the edge of support). They are made of reinforcing steel B500 and due to their forged heads, they are anchored very well at the level of the flexural reinforcement layers.

Punching shear reinforcement DE+DKD

Types

Punching shear elements DE come in heights from 100 to 320 mm. They can be used to increase the bearing capacity of reinforced concrete members with an overall depth of 200 to 450 mm.

TypeHeightChordsVertical BarsElements
hDEØØDistanceLeg Length lWeight
mmmmmmmmmmkg
DE 1001006,06,0506001,60
DE 1201206,06,0506001,71
DE 1401406,06,0506001,81
DE 1601606,06,0507002,24
DE 1801806,06,0507002,36
DE 2002006,06,0507002,49
DE 2202206,06,0508503,17
DE 2402406,06,0508503,32
DE 2602606,06,0508503,47
DE 2802806,06,05010004,26
DE 3003006,06,05010004,44
DE 3203206,06,05010004,62

Weight and dimensional tolerances as per ÖNORM B 4707

 

Double-headed studs DKD come in heights from 140 to 360 mm. Like punching shear elements DE, they can be used to increase the bearing capacity of reinforced concrete members with an overall depth of 200 to 450 mm.

TypeHeightFlat barDouble-headed Stud Pair
h DKDlShaft ØHead ØDistance e DKD
mmmmmmmmmm
DKD – P 1401401651030105
DKD – P 1601601801030120
DKD – P 1801801951030135
DKD – P 2002002101030150
DKD – P 2202202251030165
DKD – P 2402402401030180
DKD – P 2602602551030195
DKD – P 2802802701030210
DKD – P 3003002851030225
DKD – P 3203203001030240
DKD – P 3403403151030255
DKD – P 3603603301030270

Weight and dimensional tolerances as per ÖNORM B 4707

Punching shear reinforcement DE+DKD

Installation / Placement

Punching shear elements DE are placed between the lower and upper layers of flexural reinforcement and thus, they also serve as spacers. Usually, at least eight elements each with an opening angle of 22.5° are placed in the column head area in a rotationally symmetrical arrangement. The type of punching shear element DE depends on the slab thickness.

Punching shear resistance of DE with K ≤ 1.65

cross section slab de 2
If it is sufficient to increase the punching shear resistance VRd,c of a slab by not more than 65% (Kmax) = 1.65), only punching shear elements DE are used as reinforcement.
plan view de 1

Punching shear resistance of DE+DKD with 1.65 < K ≤ 1.96

cross section slab de dkd 1
A combination of punching shear elements DE and double-headed studs DKD will be used if the applied loads require a higher load resistance (K > 1.65). The double-headed studs DKD, in the form of double-headed stud pairs, are inserted into the slab from above after completion of the reinforcement. The upper edge of the stud head is flush with the outer edge of the top reinforcement layer.
plan view de dkd 1

Punching shear reinforcement DE+DKD

Gallery

DE scaled
BNL2302 2 scaled
Baustelle DE scaled
Baustelle 2 scaled
Baustelle 3 scaled
BNL2489 scaled

Punching Shear Reinforcement DE+DKD

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