Structure having a strengthening element made of high-strength concrete for increasing punching shear strength

1. A structure comprising:

a plate having a strengthening element of high-strength concrete for increasing punching shear strength with said high-strength concrete having a compressive strength of at least 55 N/mm 2 ;

said strengthening element being arranged in said plate and being configured to have an annular shape and to define an opening;

said strengthening element including a plurality of prefabricated individual segments arranged annularly about said opening; and,

each two mutually adjacent ones of said plurality of prefabricated individual segments conjointly defining a distance (c) therebetween and being bonded to each other by casting material.

2. The structure of claim 1 , wherein said casting material has a strength less than said high-strength concrete of said strengthening element.

3. The structure of claim 2 , wherein said distance (c) is at most 10 cm at said opening.

4. The structure of claim 2 , wherein mutually adjacent ones of said plurality of prefabricated individual segments define gaps therebetween; and, said strengthening element having reinforcing elements projecting into said gaps.

5. The structure of claim 1 , wherein at least two of said plurality of prefabricated individual segments are configured identically.

6. The structure of claim 1 , wherein said plate includes a punching shear reinforcement.

7. The structure of claim 6 , wherein said punching shear reinforcement includes a reinforcing element; at least one of said plurality of prefabricated individual segments has a groove; and, said reinforcing element of said punching shear reinforcement projects into said groove.

8. The structure of claim 7 , wherein said reinforcing element of said punching shear reinforcement is fixed in said groove with a material having a strength less than that of said high-strength concrete of said strengthening element.

9. The structure of claim 6 , wherein said punching shear reinforcement has at least one reinforcing element; and, said at least one of said reinforcing elements is arranged outside of said strengthening element.

10. The structure of claim 7 further comprising:

a pillar;

said groove having an end facing said pillar; and,

said end of said groove facing said pillar being closed.

11. The structure of claim 1 , wherein said plate has a lower reinforcement running above said strengthening element.

12. The structure of claim 11 , wherein said strengthening element has an edge region; and, said lower reinforcement of said plate has an upward offset portion disposed adjacent to said edge region.

13. The structure of claim 1 , wherein said strengthening element has a beveled edge region.

14. The structure of claim 1 further comprising a pillar connected to said plate and arranged in a region of said opening.

15. The structure of claim 1 , wherein said plate is a flat slab.

16. The structure of claim 1 , wherein said casting material is cast-in-place concrete or grouting mortar.

17. A structure comprising:

a plate having a strengthening element of high-strength concrete for increasing punching shear strength with said high-strength concrete having a compressive strength of at least 55 N/mm 2 ;

said strengthening element being configured to have an annular shape and to define an opening;

said strengthening element including a plurality of prefabricated segments arranged annularly about said opening;

said plate including a punching shear reinforcement;

said punching shear reinforcement including a reinforcing element;

at least one of said plurality of prefabricated segments having a groove;

said reinforcing element of said punching shear reinforcement projecting into said groove;

said reinforcing element of said punching shear reinforcement being fixed in said groove with a material having a strength less than that of said high-strength concrete of said strengthening element; and,

said material being cast-in-place concrete.