Classifications

• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
  • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
  • E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
  • E04C5/06—Reinforcing elements of metal, e.g. with non-structural coatings of high bending resistance, i.e. of essentially three-dimensional extent, e.g. lattice girders
  • E04C5/0645—Shear reinforcements, e.g. shearheads for floor slabs

Definitions

• the invention relates to a shear control system for reinforced concrete structures and to a method of placement of reinforcement in order to achieve desired shear control.
• shear reinforcement elements are typically placed substantially perpendicular to the main reinforcement elements with a view to preventing these main reinforcement elements moving away from each other under the influence of shear forces in the structure.
• the objective of the present invention is to provide a reinforcement shear control system adapted to reduce the number of elements comprising the reinforcement structure whilst providing effective shear control or at least to provide the market with an alternative.
• a shear reinforcement system for a reinforced concrete structure comprising one or more shear control members bent into a substantially rectangular wave formation; the shear control members being unitary and continuous for at least l.S wave cycles and being adapted to restrain conventional main tension control reinforcement elements placed substantially transversely thereto and against the shear control reinforcement adjacent a point of maximum amplitude but within the wave configuration.
• Figures la, lb and lc are sectional views of conventional reinforcing systems
• FIG. Id and le are sectional views of the reinforcement shear control system in accordance with the present invention.
• Figure 3 a is a section through a conventional shear reinforcement system in a continuous run situation such as a wall or flat slab;
• Figure 3b is a section through shear control reinforcement in accordance with the present invention applied to a continuous run such as a wall or flat slab;
• Figure 4a is a perspective view of multiple parallel rows of shear reinforcement in accordance with the present invention and associated main tension control reinforcement as would be used in relation to a conventional slab;
• Figure 4b is a side elevation of one row of shear reinforcement from the grid of figure 4a;
• Figure 5 is a top plan view of a shear control system in accordance with the present invention with a series of shear control elements and main tension control reinforcement all running at right angles to each other;
• Figure 5a is a section through A-A' of figure 5 and
• figure 5b is a section through B-B' of figure 5.
• the conventional shear reinforcement elements are indicated by the reference numerals 1 with the main reinforcement adapted to control tension in the reinforced concrete structure being indexed by the numerals 2 and the wave pattern shear control reinforcement elements in accordance with the present invention being indexed by numerals 3.
• shear reinforcement 3 in accordance with the present invention takes the form of a rectangular wave pattern although the wave length is not necessarily constant with respect to the amplitude having regard to the fact that the top and bottom main tension control steel in any given structure may have a different spacing than that spacing between each element of main tension control steel and its adjacent element.
• the wave length of the shear control system in accordance with the present invention may not be constant.
• Figure 2b depicts a situation where the wave length of every other half wave is twice as long as the preceding wave length.
• top steel 2a and bottom steel 2b are not exactly as would be the case in the conventional arrangement depicted in figure 3a. This is due to the fact that in order to work in the best possible manner the main tension control steel elements are placed against the internal corners of the square wave function shaped shear reinforcement in accordance with the present invention. This results in the top steel 2a not being directly above the corresponding bottom steel element 2b as is clear from figure 2b. Top steel elements 2a are actually staggered with respect to bottom steel elements 2b in the embodiment of the present invention depicted in figure 3b.
• FIG 5 there is depicted a rectangular grid of steel reinforcement elements in accordance with the present invention.
• the tops of the shear control elements in accordance with the present invention are depicted in solid lines with the top 2a and bottom 2b linear main tension control steel elements being depicted in broken lines.
• the regular square wave form shear control members 3 in accordance with the present invention are likewise placed in a series of parallel rows and parallel columns (the columns being at ninety degrees to the rows).
• placement of the shear reinforcement in accordance with the present invention should occur prior to placement of the main tension control reinforcement in any given structure in order that the main shear control steel may be placed in the most advantageous position with respect to the shear control reinforcement.
• This most advantageous position is the internal corners of the rectangular wave structure of the shear control reinforcement in accordance with the present invention.

Landscapes

• Engineering & Computer Science (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Reinforcement Elements For Buildings (AREA)
• Working Measures On Existing Buildindgs (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=3795584

Family Applications (1)

Country Status (5)

Cited By (2)

Citations (4)

Family Cites Families (2)

• 1996
  • 1996-07-29 AU AUPO1269A patent/AUPO126996A0/en not_active Abandoned
• 1997
  • 1997-07-29 WO PCT/AU1997/000479 patent/WO1998004792A1/en not_active Application Discontinuation
  • 1997-07-29 CA CA002261729A patent/CA2261729A1/en not_active Abandoned
  • 1997-07-29 EP EP97931590A patent/EP0917611A4/en not_active Withdrawn
  • 1997-07-29 JP JP09541234A patent/JP2000514513A/ja active Pending

Patent Citations (6)

Non-Patent Citations (1)

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