EP2683889A1 - Pillar for building constructions - Google Patents
Pillar for building constructionsInfo
- Publication number
- EP2683889A1 EP2683889A1 EP12713289.2A EP12713289A EP2683889A1 EP 2683889 A1 EP2683889 A1 EP 2683889A1 EP 12713289 A EP12713289 A EP 12713289A EP 2683889 A1 EP2683889 A1 EP 2683889A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pillar
- concrete
- cast
- dissipator
- separator element
- 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.)
- Granted
Links
- 238000009435 building construction Methods 0.000 title claims abstract description 6
- 239000004567 concrete Substances 0.000 claims abstract description 44
- 230000002787 reinforcement Effects 0.000 claims abstract description 32
- 239000002184 metal Substances 0.000 claims abstract description 9
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 6
- 239000010959 steel Substances 0.000 claims abstract description 6
- 238000004873 anchoring Methods 0.000 claims description 14
- 230000010355 oscillation Effects 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims description 8
- 230000001464 adherent effect Effects 0.000 claims description 5
- 229920001084 poly(chloroprene) Polymers 0.000 claims description 3
- 238000000034 method Methods 0.000 claims 7
- 239000004568 cement Substances 0.000 claims 1
- 230000006355 external stress Effects 0.000 claims 1
- 230000003534 oscillatory effect Effects 0.000 claims 1
- 239000011150 reinforced concrete Substances 0.000 abstract 2
- 239000000203 mixture Substances 0.000 abstract 1
- 230000006378 damage Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 235000001674 Agaricus brunnescens Nutrition 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
- E04H9/022—Bearing, supporting or connecting constructions specially adapted for such buildings and comprising laminated structures of alternating elastomeric and rigid layers
-
- 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
- E04C5/0604—Prismatic or cylindrical reinforcement cages composed of longitudinal bars and open or closed stirrup rods
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/20—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of concrete, e.g. reinforced concrete, or other stonelike material
- E04B1/21—Connections specially adapted therefor
- E04B1/215—Connections specially adapted therefor comprising metallic plates or parts
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/024—Structures with steel columns and beams
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/025—Structures with concrete columns
Definitions
- the present invention concerns a pillar made of steel and concrete which can be applied to bearing structures of single story or multistory buildings and which can be used in zones with an earthquake risk.
- joints we mean the zones of interconnection between the pillars and the bearing beams of the floors.
- Purpose of the present invention is to increase the deformation capacity of the critical zone of the pillars without substantial increase in stresses and therefore preventing the collapse and breakages or damages which can cause the structure to be unfit for use.
- the Applicant has devised, tested and embodied the present invention to overcome the shortcomings of the state of the art and to obtain these and other purposes and advantages.
- a pillar for buildings comprises a metal reinforcement with a substantially vertical development and hence longitudinal to the pillar drowned in a cast of concrete.
- the pillar can be provided with an external circling ring, or jacket, while the section can be various.
- the pillar in a position corresponding to, that is, near a joint, or in an intermediate position along the pillar itself, the pillar comprises at least a separator element of the plate type which extends substantially for the entire cross section of the pillar.
- the separator element is passed through by the reinforcement with the function of dissipating energy and/or by first energy dissipating elements, also made of metal, distinct and autonomous with respect to other parts of the reinforcement and of the pillar.
- the at least one separator element has a deformability which is greater than that of the concrete so as to be able to deform in the event of stresses due to an earthquake.
- the function of dissipator element can be carried out by the first dissipator elements and/or by second dissipator elements which are the rods of the reinforcement.
- each energy dissipator element has a coefficient of elasticity greater than that of the cast of concrete.
- the dissipator elements are firmly anchored, by means of anchoring means, to the cast of concrete on opposite sides with respect to the separator element.
- the anchoring means can comprise at least one support element which, as understood here, can be a bearing plate, also solid to the part of the cast of concrete adjacent to the separator element, or the cast of concrete itself in which the reinforcement is drowned, or a foundation or other solid element suitable to adequately support the pillar and to constitute a stable anchorage for the reinforcement rods and/or for the dissipator elements other than the reinforcement.
- the separator element is at least partly elastic, for example of a material similar or comparable or equal to the material commercially known such as neoprene, even if the use of other materials having similar deformability to that of neoprene is not excluded.
- the separator element is any material or device able to achieve a structural type discontinuity along the extension of the pillar. According to the invention, during a seismic event, because of the effect of lateral forces, a fissure with a triangular section or similar is created between the upper part and the supporting base of the separator element, which puts the dissipator elements in traction and generates a dissipation of the seismic energy.
- the calculation of the dissipator elements in the dissipation zone can provide a sizing suitable to the allowed lengthening, possibly extending the non-adherent zone between dissipator elements and concrete, or increasing the thickness of the separator element, or providing to insert elements to coat the dissipator elements to make them at least partly non-adherent to the concrete.
- the structure is not damaged.
- the separator element has a thickness adequate for the design specifications and to the load it has to bear, as well as to the type of constituent material.
- the thickness of the separator element can be comprised between 0.8 mm and 5.0 mm, advantageously between 1.0 mm and 1.5 mm.
- the thickness of the separator element will be comprised between 10 mm and 50 mm, advantageously between 25 mm and 35 mm.
- the thickness of the separator element can vary from 0.8 mm to 150 mm and more.
- a variant of the invention makes at least part of the pillar work around a median axis to the cross section of the pillar.
- - fig. la is a section view of a pillar for building constructions according to the present invention.
- - fig. lb is a section view of a pillar for building constructions in a second form of embodiment
- - fig. 2 is a section view of fig.1 along the line II;
- - fig. 3 is a first variant of fig. 1 ;
- - fig. 4 is a second variant of fig. 1 ;
- - fig. 5 is a view of a detail in fig. 1 according to some forms of embodiment
- - fig. 7 is a variant of fig. lb;
- - fig. 8 is a variant of a detail of fig. 3;
- - fig. 9 shows a separator element without the central part, of a toroidal shape in the case shown
- - fig. 10 shows a separator element with a differentiated section and with an oscillation pin within the internal area of the pillar
- - fig. 1 1 shows a pillar with a separator element and two bearing plates with respective dissipator elements
- - fig. 12 is a variant of fig. 4.
- a pillar for building constructions which can be the normal type with internal reinforcement, or the mixed steel-concrete type, or the only encircled type, is indicated in its entirety by the reference number 10, and comprises a metal reinforcement 14, consisting of reinforcement rods joined to each other in a cage in a known manner, the reinforcement 14 being immersed in a cast of concrete 16.
- a separator element 12 substantially of the plate type, is disposed in a substantially orthogonal direction with respect to the axis of the pillar 10, while the reinforcement 14 has the rods which pass through it (figs, lb, 3, 4 and 7).
- the separator element 12 has a differentiated section. Furthermore, in association with the differentiated section it is provided that the oscillation of the mobile part of the pillar 10 occurs in a cradle shape which carries the oscillation inside the section of the pillar, preventing concentrated loads, advantageously near the central zone.
- the separator element 12 can be applied near an interconnection joint 20 as shown in fig. la, or in an intermediate position of the longitudinal extension of the pillar 10 as shown in fig. lb, or again (fig. 4), in proximity to the connection of the pillar 10 to the base plate of the foundations 30.
- the separator element 12 (figs. 1-3) can cooperate with bearing plates or structures 22, suitable to position and support beams 17 of a floor, in which case the bearing plates 22 can have compartments for the transit of the connection rods 18.
- the pillar 10 can comprise an external jacket 13 which may have only a containing function or it may cooperate in supporting the load; when the concrete is cast, the jacket 13 may act as a form work to make the finished pillar 10.
- the pillar 10 may comprise a second plate 24, disposed in contact against a surface of the separator element 12, the function of which is to distribute equally the load supported by the pillar 10.
- the second plate 24 can completely cover the whole cross section of the pillar 10, and the end of the external jacket 13 can be welded to it.
- the rods of the reinforcement 14 may be made solid both with the bearing plate and with the second plate 24, or they may be made solid only with the second plate 24, taking away, or at least reducing, their deforming capacity.
- the second plate 24 is disposed in contact against a surface of the separator element 12, opposite the contact surface with the bearing plate 22.
- the second plate 24 is provided with through holes made near the points where first dissipator elements 15 pass through, which in turn pass through the second plate 24 without anchoring to it, since they anchor to the bearing plate 22.
- the separator element 12 is passed through by the rods of the reinforcement 14, and disposed between a first cast of concrete 16a and a second cast of concrete 16b.
- the pillar 10 comprises two second plates 24 disposed on the two opposite surfaces of the separator element 12 and extending for the whole cross section of the pillar 10.
- the external jacket 13 is interrupted transversely near the two second plates 24, leaving the rods of the reinforcement 14 with the possibility of deforming in the event of seismic phenomena.
- the second plate 24 disposed under the separator element 12 functions as a support element for the separator element 12.
- dissipator elements 15 consisting for example of steel round pieces or bars, may be disposed through the second plates 24, and are made solid with at least one of them.
- the rods of the reinforcement 14, on the lower part and the upper part of the pillar 10, terminate and anchor respectively in correspondence with the bearing plate 22 and the second plate 24, not passing through the separator element 12.
- Figs. 3 and 4 show a pillar 10 without the external steel jacket 13.
- the section of the pillar 10 can be any shape whatsoever depending on design specifications.
- rods of the reinforcement 14 can be anchored to the bearing plate 22, but also the first dissipator elements 15, which extend into the cast of concrete 16 and pass through the separator element 12.
- the first dissipator elements 15 can be made solid with the bearing plate 22 in any way whatsoever.
- the free ends, which extend into the concrete, of the first dissipator elements 15 are provided with anchoring means 23, in this case mushroom shaped, and in the event of an earthquake, prevent the first dissipator elements 15 from coming out of the cast of concrete 16.
- the first dissipator elements 15 and possibly the rods of the reinforcement 14 are made solid with the bearing plate 22 in correspondence with an upper anchoring plane 27 (fig. 1) or a lower anchoring plane 31 or on both planes of the bearing plate 22.
- the separator element 12 and the first dissipator elements 15 may be disposed, as described above, also on the bearing plate 22 opposite the one described with reference to fig. 1, that is, on one side of the bearing plate opposite the one described in previous forms of embodiment.
- An example of this application is shown in fig. 12 where the bearing plate 22 is disposed in contact against the lower surface of a floor 36 and anchoring rods 37 provide to keep the pillar 10 anchored to the base of the floor.
- the separator element 12, in this form of embodiment, is disposed at the top of the pillar 10.
- the rods of the reinforcement 14 and/or the first dissipator elements 15 are suitable to absorb, to the extent desired by the designer, the stresses that occur in conditions of flexion and/or flexion-torsion.
- the separator element 12 can be provided in proximity to the bearing plate 22 of the pillar 10, that is, in the connection zone with the foundations 30 by means of reinforcement rods 32.
- the separator element 12 can be disposed under the bearing plate 22.
- Fig. 6 shows how one solution according to the invention works.
- the pillar 10 oscillates with respect to the separator element 12.
- the pillar 10 rests on the bearing plate 22, pressing the separator element 12 and rotating around an oscillation point 28, in this case hinge-wise, according to an angle of divarication a.
- Fig. 10 shows a variant of how the pillar 10 can work.
- the oscillation point 28 is located near the central zone of the pillar 10.
- the traction stress finds a resisting strenght in the rods of the reinforcement 14 and the first dissipator elements 15, which give a determinate flexional resistance capacity, absorbing some of the stresses in play.
- the stresses in play exceed the elastic limit of the dissipator elements 15 and/or the rods of the reinforcement 14, the condition is reached where one and/or the other dissipator element is destroyed.
- the first dissipator elements 15 may also have other shapes, all suitable to function as above.
- the first dissipator elements 15 can comprise a tubular element 25, incorporated in the cast of concrete 16 and cooperating with the first dissipator element 15 which has deformation means 33, which functions as a separator element to make the first dissipator elements 15 non-adherent to the cast of concrete 16.
- the tubular element 25, in another form of embodiment, may also have an external jacket 26, which leaves space for the deformation of the tubular element 25, preventing the cast of concrete 16 from preventing or slowing down the deformation. In this case it is the tubular element 25, or also the tubular element 25, which constitutes the dissipator element. If the tubular element 25 constitutes the dissipator element, it will be anchored only in the concrete.
- the parts of the rods of the reinforcement 14 that cooperate with the plate 22 may also be provided with a tubular element 25 as described above, to allow said deformation.
- the tubular element 25 may be made of metal, wood, plastic or other material.
- both the rods of the reinforcement 14 and the first dissipator element 15 are each provided with a covering element 35 which, like the tubular element 25 described above, functions as a separator element, rendering the rods of the reinforcement 14 and the first dissipator elements 15 non-adherent to the cast of concrete 16 for a predetermined length.
- the length of the covering element 35 is comprised, simply to give an example, between about 10 cm and about 100 cm, even if this length is proportional to the extension of the pillar 10 and to the load that the absorbing system has to support.
- the covering element 35 prevents the cast of concrete 16 surrounding the first dissipator elements 15 and/or the rods of the reinforcement 14 from contrasting the dissipating action, since it too is affected in terms of destruction during a seismic event.
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Buildings Adapted To Withstand Abnormal External Influences (AREA)
- Working Measures On Existing Buildindgs (AREA)
- Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT000030A ITUD20110030A1 (en) | 2011-03-08 | 2011-03-08 | PILLAR FOR BUILDING CONSTRUCTION |
PCT/IB2012/000433 WO2013050812A1 (en) | 2011-03-08 | 2012-03-08 | Pillar for building constructions |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2683889A1 true EP2683889A1 (en) | 2014-01-15 |
EP2683889B1 EP2683889B1 (en) | 2016-08-10 |
Family
ID=43977546
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12713289.2A Active EP2683889B1 (en) | 2011-03-08 | 2012-03-08 | Pillar for building constructions |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2683889B1 (en) |
IT (1) | ITUD20110030A1 (en) |
WO (1) | WO2013050812A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110029729B (en) * | 2019-04-04 | 2021-03-12 | 山东大学 | Splicing joint of prefabricated reinforced concrete main beam and secondary beam and construction method |
JP7449126B2 (en) | 2020-03-10 | 2024-03-13 | 株式会社竹中工務店 | Column beam joint structure |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3350821A (en) * | 1965-01-11 | 1967-11-07 | Potteries Motor Traction Compa | Building construction responsive to changing support condition |
NZ201015A (en) * | 1982-06-18 | 1986-05-09 | New Zealand Dev Finance | Building support:cyclic shear energy absorber |
US4727695A (en) * | 1986-07-24 | 1988-03-01 | Kemeny Zoltan A | Building structure shock isolation system |
US5660007A (en) * | 1991-03-29 | 1997-08-26 | Kansas State University Research Foundation | Stiffness decoupler for base isolation of structures |
FR2747418B1 (en) * | 1996-04-12 | 2000-06-02 | Claude Verstraete | PROCESS FOR THE PARASISMIC CONSTRUCTION OF REINFORCED CONCRETE BUILDINGS AND HOUSES |
-
2011
- 2011-03-08 IT IT000030A patent/ITUD20110030A1/en unknown
-
2012
- 2012-03-08 WO PCT/IB2012/000433 patent/WO2013050812A1/en active Application Filing
- 2012-03-08 EP EP12713289.2A patent/EP2683889B1/en active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2013050812A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2013050812A1 (en) | 2013-04-11 |
EP2683889B1 (en) | 2016-08-10 |
ITUD20110030A1 (en) | 2012-09-09 |
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