CA2261729A1 - Reinforcement shear control system - Google Patents
Reinforcement shear control system Download PDFInfo
- Publication number
- CA2261729A1 CA2261729A1 CA002261729A CA2261729A CA2261729A1 CA 2261729 A1 CA2261729 A1 CA 2261729A1 CA 002261729 A CA002261729 A CA 002261729A CA 2261729 A CA2261729 A CA 2261729A CA 2261729 A1 CA2261729 A1 CA 2261729A1
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- CA
- Canada
- Prior art keywords
- shear
- reinforcement
- control
- hereof
- shear control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
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
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Reinforcement Elements For Buildings (AREA)
- Working Measures On Existing Buildindgs (AREA)
Abstract
A system of shear control reinforcement for use in a reinforced concrete structure comprising one or more shear control members (3) bent into a substantially rectangular wave formation; the shear control member (3) being unitary and continuous for at least 1.5 wave cycles and being adapted to restrain conventional main tension control reinforcement elements (2) placed substantially transversely thereto and against the shear control member (3) adjacent a point of maximum amplitude but within the wave configuration.
Description
W O 98/04792 PCTtAU97/00479 REINFO~CF.M~IT SHEAR CONTROL SYSTEM
The invention relates to a shear control system for reinforced concrete ~llu~w~,s and to a method of pla~-m~nt of ~ci"rOr~-"~ t in order to achieve desired shear control.
With any rcinrorec~l.enl system in concrete structures there are the main rchlrorcclllcnl clr "P .li which control the tension forces and to a lesser extent the COIlllJl'eS~;Oll forces There is also often need to control shear forces occu"ii~g within the structure. These forces are controlled by shear r~,h~forcclllelll elo ~.e~ Shear le;llru~;c~l~e~lt el~ -.e ~1~ are typically placed subs~ y perpendicular to the main rci.lrorcement cle,-,e--l.e with a view to p,~,.c,.lin~, these main rthlrolce~e.ll clf. ..ç~; moving away from each other under the influence of shear forces in the structure.
FY;~;ng ~l~gf-~..CntS of l~;nrurce.l-ent and the shear elements in structures has, to a large extent, been an add on feature after the main ~chlrolec..le.,l has been ~igned and placed in position. This has had the effect of adding a large number of individual items needing to be fixed in the construction process.
Accordingly the objective of the present invention is to provide a rei.-rolcc..,e.~l shear control system adapted to reduce the number of ele-..f ~ comprising the rcinfolcc~enl structure whilst providing err~live shear control or at least to provide the market with an alttl,.al;~e.
Accoldh.g to the present invention there is ~i~rlosed a shear l~,h~rorce.n~.lt system for a r~h~l~d concrete structure cc,...~,.;sing one or more shear control r..c...~e.~ bent into a Q~l,st~ ;slly l~ g~ll9r wave formation; the shear control .--e b~ ~ being unitary and cr~ntinllolls for at least 15 wave cycles and being ~'spted to restrain conv~ ~;o--~l main tension control leil~rol~...eut ele..le..~s placed s~lbstqnti~lly ~ r~l~ely thereto and against the shear control reinrol~n.elll adjacent a point of ;.. ,. qmrlihlde but within the wave confi~-ration A number of embo~ ofthe present invention will now be des~,l;l)ed with I.,~ ,nce to the nr ~ s ...r~ ;ng dla~lv;n~s in which Figures la, lb and lc are secti~nql views of co"~
l~i. ro.~,in~, s~;.t~.-.s;
Figures ld and le are sectionql views of the r~;l~r~...e.ll shear control system in accordance with the present invention;
Figures 2a and 2c are se~i~ ns through alt~-q-te Coll~ ;onql she. r tS~t~ll-S, SUBSTlTU~ SHEET (~ule 26) - r Figures 2b and 2d are sectinn~l views through ~,h~rol~.lle.lt shear control ~ te.lls in accord~ ce with the present h~ iGn;
Figure 3a is a section IlllUL~ a convention~l shear r~in~or~.lle.lt system in a cnn~in--Q~ls run situ~tion such as a wall or flat slab;
Figure 3b is a section through shear control l.,mfo,.,enlc.lt in accoldal~ce with the present inve~lion applied to a continllQl~ run such as a wall or flat slab;
Figure 4a is a pe.~,e~ e view of mllltiple parallel rows of shear eillro.~.,.enl in 8~C du~ce with the present invention and ~e~ ed main tension control re.llror~.ll~,nl as would be used in r~lalion to a convçntinn~l slab;
Figure 4b is a side el~aliol of one row of shear reinrulce~
from the grid of figure 4a;
Figure S is a top plan view of a shear control system in accordance with the present il~vt;~lioll with a series of shear control elements and main tension control reinfolce.l,cnt all running at right angles to each other;
SUBSTITUTE SHE~T (n~ule 26) Figure Sa is a section through A-A' of figure 5 and figure 5b is a section through B-B' of figure S.
In the emhod;.. e~ depic,ted in the various figures h~,r~ h the con~/e~l;o~ shear le;~ ,.llellt ek ..~ are inAie~ted by the reÇe.~nce numerals l with the main leil~l.,~,l,e.lt A~1arted to control tension in the leh~,~ed concrete structure being indeYed by the numerals 2 and the wave pattern shear control l~inrorce."t;lll ~IP.",. .~1S in ~cco-ddl ce with the present invention being ind~yed by numerals 3.
It will be noted that thro~-~hnut the ~ wings the shear reh~l~,l*l~l 3 in accordance with the present invention takes the form of a lecl~u~ qr wave pattern A~ u~h the wavê length is not l-e~,ssq ily con ~ 1 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 dirr~
;~par;l~, th_n that spacing bcl~ e~l each element of main tension control steel and its adjacent r1c ..P .~ As will be evident from figure 2b it may be desirable that the wave length of the shear control system in accordallce with the present h~ ,-ltiOll may not be ~n~ti~ Figure 2b depicts a s;lualion where the wave length of every other half wave is twice as long as the pr~eding wave length It will be appreciated from figure 3b that the p1aC~m~nt of top steel 2a and bottom steel 2b is not exactly as would be the case in the SUBSTITUTE S~ T (Rule 26) r - -convçnticn~l a~l .r~g~",r..~1 d~r cted in figure 3a. This is due to the fact that in order to work in the best possible manner the main tension control steel ~le...~ ..1c are placed against the internal corners of the square wave function shaped shear ~.nfo~e.l.e.~t in sccoldallce with the present invention. This results in the top steel 2a not being directly above the co..~s~,o~ g bottom steel ele.- ~ 2b as is clear from figure 2b. Top steel ~ 2a are actually staggered with respect to bottom steel e,l~,.l.e..ls 2b in the PmbodimPnt of the present invention dPpicted in figure 3b.
With reft;lence to figure 5 there is depicted a ~ g~ t grid of steel reil~rcc;..,~ elpmentc in acco,dd lce with the present invention. It will be noted that only the tops of the shear control cle ~- ~nlc in f ~ ., O -dallCe with the present invention are depi~,led in solid lines with the top 2a and bottom 2b linear main tension control steel ~k.. .~ being de,ricted in broken lines. As both the main tension control steel ek ..~ (top and bottom) are placed in a series of rows and coh~mnc at right angles to each other in the con~e a;~ l fashion (except that they are ~ .red as hereinbefore desclibed) the regular square wave form shear control mci..be.~ 3 in a~crdal1ce with the present invention are likewise placed in a series of parallel rows and parallel columns (the columnC being at ninety degrees to the rows). The heights of the various steel ele~..e ~
with respect to each other are readily appa,~nl from figures 5a and 5b. It will be noted from figures Sa and 5b that the shear control steel in SUBSITIU~ S~EET (Rule 26) accordance with the present invention never protrudes much more than one ~ met~r of ,~,.,~rced steel bar above the outerrnost main tension control l~h~lcill~ bar.
It -will be appreciated by those skilled in the art that placement of the shear leinfo,.,cn,c"l in acco,dallce with the present invention should occur prior to pl~cemPnt of the main tension control reinrolce".ent in any given structure in order that the main shear control steel may be placed in the most adv~nt~geous position with respect to the shear control lehlror.,e.llel,l. This most adv~nt~geous position is the internal corners of the fec~ g,.l~r wave structure of the shear control reillîorc~.nelll in accoldallce with the present hl~ ;oll.
The dlawh~gs h~.,..~iLh depict shear lc;~ ~lllcllL in accordance with the present invention being utilised in respect of planer articles. It should be appreciated that conca~/~, convex or even circular articles may be formed ili~in~ shear re,n~r~,elllent in accordance with the present invention and in such cases the im~n~ry axis along which the rect~n~ r wave form ofthe shear reinÇolcelllent would proceed would no longer be linear but would itself be curved.
It will ful ~h~,. ,llore be apl,l ecialed that the co~tin.lo~s nature of the square wave form shear control Ich~ol cell.en~ of the present invention results in ~ I ... . ..
The invention relates to a shear control system for reinforced concrete ~llu~w~,s and to a method of pla~-m~nt of ~ci"rOr~-"~ t in order to achieve desired shear control.
With any rcinrorec~l.enl system in concrete structures there are the main rchlrorcclllcnl clr "P .li which control the tension forces and to a lesser extent the COIlllJl'eS~;Oll forces There is also often need to control shear forces occu"ii~g within the structure. These forces are controlled by shear r~,h~forcclllelll elo ~.e~ Shear le;llru~;c~l~e~lt el~ -.e ~1~ are typically placed subs~ y perpendicular to the main rci.lrorcement cle,-,e--l.e with a view to p,~,.c,.lin~, these main rthlrolce~e.ll clf. ..ç~; moving away from each other under the influence of shear forces in the structure.
FY;~;ng ~l~gf-~..CntS of l~;nrurce.l-ent and the shear elements in structures has, to a large extent, been an add on feature after the main ~chlrolec..le.,l has been ~igned and placed in position. This has had the effect of adding a large number of individual items needing to be fixed in the construction process.
Accordingly the objective of the present invention is to provide a rei.-rolcc..,e.~l shear control system adapted to reduce the number of ele-..f ~ comprising the rcinfolcc~enl structure whilst providing err~live shear control or at least to provide the market with an alttl,.al;~e.
Accoldh.g to the present invention there is ~i~rlosed a shear l~,h~rorce.n~.lt system for a r~h~l~d concrete structure cc,...~,.;sing one or more shear control r..c...~e.~ bent into a Q~l,st~ ;slly l~ g~ll9r wave formation; the shear control .--e b~ ~ being unitary and cr~ntinllolls for at least 15 wave cycles and being ~'spted to restrain conv~ ~;o--~l main tension control leil~rol~...eut ele..le..~s placed s~lbstqnti~lly ~ r~l~ely thereto and against the shear control reinrol~n.elll adjacent a point of ;.. ,. qmrlihlde but within the wave confi~-ration A number of embo~ ofthe present invention will now be des~,l;l)ed with I.,~ ,nce to the nr ~ s ...r~ ;ng dla~lv;n~s in which Figures la, lb and lc are secti~nql views of co"~
l~i. ro.~,in~, s~;.t~.-.s;
Figures ld and le are sectionql views of the r~;l~r~...e.ll shear control system in accordance with the present invention;
Figures 2a and 2c are se~i~ ns through alt~-q-te Coll~ ;onql she. r tS~t~ll-S, SUBSTlTU~ SHEET (~ule 26) - r Figures 2b and 2d are sectinn~l views through ~,h~rol~.lle.lt shear control ~ te.lls in accord~ ce with the present h~ iGn;
Figure 3a is a section IlllUL~ a convention~l shear r~in~or~.lle.lt system in a cnn~in--Q~ls run situ~tion such as a wall or flat slab;
Figure 3b is a section through shear control l.,mfo,.,enlc.lt in accoldal~ce with the present inve~lion applied to a continllQl~ run such as a wall or flat slab;
Figure 4a is a pe.~,e~ e view of mllltiple parallel rows of shear eillro.~.,.enl in 8~C du~ce with the present invention and ~e~ ed main tension control re.llror~.ll~,nl as would be used in r~lalion to a convçntinn~l slab;
Figure 4b is a side el~aliol of one row of shear reinrulce~
from the grid of figure 4a;
Figure S is a top plan view of a shear control system in accordance with the present il~vt;~lioll with a series of shear control elements and main tension control reinfolce.l,cnt all running at right angles to each other;
SUBSTITUTE SHE~T (n~ule 26) Figure Sa is a section through A-A' of figure 5 and figure 5b is a section through B-B' of figure S.
In the emhod;.. e~ depic,ted in the various figures h~,r~ h the con~/e~l;o~ shear le;~ ,.llellt ek ..~ are inAie~ted by the reÇe.~nce numerals l with the main leil~l.,~,l,e.lt A~1arted to control tension in the leh~,~ed concrete structure being indeYed by the numerals 2 and the wave pattern shear control l~inrorce."t;lll ~IP.",. .~1S in ~cco-ddl ce with the present invention being ind~yed by numerals 3.
It will be noted that thro~-~hnut the ~ wings the shear reh~l~,l*l~l 3 in accordance with the present invention takes the form of a lecl~u~ qr wave pattern A~ u~h the wavê length is not l-e~,ssq ily con ~ 1 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 dirr~
;~par;l~, th_n that spacing bcl~ e~l each element of main tension control steel and its adjacent r1c ..P .~ As will be evident from figure 2b it may be desirable that the wave length of the shear control system in accordallce with the present h~ ,-ltiOll may not be ~n~ti~ Figure 2b depicts a s;lualion where the wave length of every other half wave is twice as long as the pr~eding wave length It will be appreciated from figure 3b that the p1aC~m~nt of top steel 2a and bottom steel 2b is not exactly as would be the case in the SUBSTITUTE S~ T (Rule 26) r - -convçnticn~l a~l .r~g~",r..~1 d~r cted in figure 3a. This is due to the fact that in order to work in the best possible manner the main tension control steel ~le...~ ..1c are placed against the internal corners of the square wave function shaped shear ~.nfo~e.l.e.~t in sccoldallce with the present invention. This results in the top steel 2a not being directly above the co..~s~,o~ g bottom steel ele.- ~ 2b as is clear from figure 2b. Top steel ~ 2a are actually staggered with respect to bottom steel e,l~,.l.e..ls 2b in the PmbodimPnt of the present invention dPpicted in figure 3b.
With reft;lence to figure 5 there is depicted a ~ g~ t grid of steel reil~rcc;..,~ elpmentc in acco,dd lce with the present invention. It will be noted that only the tops of the shear control cle ~- ~nlc in f ~ ., O -dallCe with the present invention are depi~,led in solid lines with the top 2a and bottom 2b linear main tension control steel ~k.. .~ being de,ricted in broken lines. As both the main tension control steel ek ..~ (top and bottom) are placed in a series of rows and coh~mnc at right angles to each other in the con~e a;~ l fashion (except that they are ~ .red as hereinbefore desclibed) the regular square wave form shear control mci..be.~ 3 in a~crdal1ce with the present invention are likewise placed in a series of parallel rows and parallel columns (the columnC being at ninety degrees to the rows). The heights of the various steel ele~..e ~
with respect to each other are readily appa,~nl from figures 5a and 5b. It will be noted from figures Sa and 5b that the shear control steel in SUBSITIU~ S~EET (Rule 26) accordance with the present invention never protrudes much more than one ~ met~r of ,~,.,~rced steel bar above the outerrnost main tension control l~h~lcill~ bar.
It -will be appreciated by those skilled in the art that placement of the shear leinfo,.,cn,c"l in acco,dallce with the present invention should occur prior to pl~cemPnt of the main tension control reinrolce".ent in any given structure in order that the main shear control steel may be placed in the most adv~nt~geous position with respect to the shear control lehlror.,e.llel,l. This most adv~nt~geous position is the internal corners of the fec~ g,.l~r wave structure of the shear control reillîorc~.nelll in accoldallce with the present hl~ ;oll.
The dlawh~gs h~.,..~iLh depict shear lc;~ ~lllcllL in accordance with the present invention being utilised in respect of planer articles. It should be appreciated that conca~/~, convex or even circular articles may be formed ili~in~ shear re,n~r~,elllent in accordance with the present invention and in such cases the im~n~ry axis along which the rect~n~ r wave form ofthe shear reinÇolcelllent would proceed would no longer be linear but would itself be curved.
It will ful ~h~,. ,llore be apl,l ecialed that the co~tin.lo~s nature of the square wave form shear control Ich~ol cell.en~ of the present invention results in ~ I ... . ..
easy h~n~ling and 8 vast red~ ion in the number of shear control el~....~." i le~luiled particularly in relation to large structures such as slabs.
Claims (11)
1. A system of shear control reinforcement for use in a reinforced concrete structure comprising one or more shear control members bent into a substantially rectangular wave formation; the shear control member being unitary and continuous for at least 1.5 wave cycles and being adapted to restrain two or more conventional main tension control reinforcement elements placed substantially transversely thereto; at least a first main tension control reinforcement element lying against the shear control reinforcement adjacent a point of maximum amplitude and at least a second such tension control reinforcement element lying against a point of minimum amplitude; at least the first and second main tension control reinforcement elements lying within the wave configuration.
2. A shear control reinforcement system in accordance with claim 1 hereof wherein the main tension control reinforcement elements are placed against the shear reinforcement element or elements at the internal corners defined by the square wave configuration of the shear reinforcement pattern.
3. A shear control reinforcement system in accordance with claim 1 hereof wherein there are two or more substantially parallel shear control elements each being unitary and continuous for at least 2.0 wave cycles and being in register such that conventional tension control reinforcement elements may pass transversely through both shear control elements abutting each shear control element in a like position with respect to the square wave pattern.
4. A shear control reinforcement system in accordance with claim 3 hereof wherein there are two sets of shear reinforcement; one as described with reference to claim 3 hereof and another like set placed perpendicular thereto with the uprights of each set of shear reinforcement abutting each other and the configuration in plan view being such that the tops of the waves form rectangles; the tops of the waves of one set of shear reinforcement being slightly above those of the other set so as to accommodate placement of both top and bottom main tension control reinforcement elements in a conventional rectangular grid-type configuration.
5. A method of placement of shear control reinforcement of the type disclosed in claim 1 hereof wherein the shear control reinforcement is located in position prior to the placement of the main tension control reinforcement.
6. A shear control reinforcement system in accordance with claim 3 hereof wherein the wave length of the shear reinforcement member is constant.
7. A shear control reinforcement system in accordance with claim 3 hereof wherein the wave length of the shear reinforcement member alternates between two different wave lengths.
8. A shear control reinforcement system in accordance with claim 3 hereof wherein the wave length of the shear reinforcement member is variable.
9. A shear control reinforcement system in accordance with any one of claims 1 to 5 hereof wherein the shear reinforcement is fabricated from conventional steel bar.
10. A shear control reinforcement system in accordance with claim 3 hereof wherein the shear control members have a rectangular wave form which proceeds along a substantially linear axis.
11. A shear control reinforcement system in accordance with claim 3 hereof wherein the shear control members have a rectangular wave form which proceeds along a curved axis.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AUPO1269 | 1996-07-29 | ||
| AUPO1269A AUPO126996A0 (en) | 1996-07-29 | 1996-07-29 | Reinforcement shear control system |
| PCT/AU1997/000479 WO1998004792A1 (en) | 1996-07-29 | 1997-07-29 | Reinforcement shear control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2261729A1 true CA2261729A1 (en) | 1998-02-05 |
Family
ID=3795584
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002261729A Abandoned CA2261729A1 (en) | 1996-07-29 | 1997-07-29 | Reinforcement shear control system |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0917611A4 (en) |
| JP (1) | JP2000514513A (en) |
| AU (1) | AUPO126996A0 (en) |
| CA (1) | CA2261729A1 (en) |
| WO (1) | WO1998004792A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10001839C2 (en) * | 1999-09-10 | 2002-03-07 | Co Baustahl Gmbh & Co Kg | Structural steel construction, concrete slab element with integrated heating or cooling function and manufacturing process |
| IT1398543B1 (en) * | 2010-03-05 | 2013-03-01 | Pigazzi Reti S R L | PUNCHING-CUTTING REINFORCEMENT ELEMENTS FOR REINFORCED CONCRETE PLATES. |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB292267A (en) * | 1927-03-22 | 1928-06-21 | John Thomas Mcnay | Improvements in top and bottom reinforcements for concrete road foundations and the like |
| GB1209221A (en) * | 1968-03-29 | 1970-10-21 | Spencer Wire Co Steel Ltd | Improvements in or relating to reinforcing material for concrete roads and the like |
| DE2703068A1 (en) * | 1977-01-26 | 1978-07-27 | Siegfried Dr Ing Krug | Concrete slab reinforcing grille - consists of upper and lower sets of bars joined by wave-form transverse elements |
| DE3331276A1 (en) * | 1983-08-30 | 1985-03-14 | Gleit- Und Lagertechnik Nell Gmbh, 5620 Velbert | Shear reinforcement |
| DE4104298C2 (en) * | 1991-02-13 | 2002-05-29 | Roesler Draht Ag | Profile reinforcement mat |
-
1996
- 1996-07-29 AU AUPO1269A patent/AUPO126996A0/en not_active Abandoned
-
1997
- 1997-07-29 EP EP97931590A patent/EP0917611A4/en not_active Withdrawn
- 1997-07-29 JP JP09541234A patent/JP2000514513A/en active Pending
- 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
Also Published As
| Publication number | Publication date |
|---|---|
| EP0917611A1 (en) | 1999-05-26 |
| WO1998004792A1 (en) | 1998-02-05 |
| JP2000514513A (en) | 2000-10-31 |
| AUPO126996A0 (en) | 1996-08-22 |
| EP0917611A4 (en) | 1999-07-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |