CA1126768A - Bearing device with high internal damping for constructions - Google Patents
Bearing device with high internal damping for constructionsInfo
- Publication number
- CA1126768A CA1126768A CA328,676A CA328676A CA1126768A CA 1126768 A CA1126768 A CA 1126768A CA 328676 A CA328676 A CA 328676A CA 1126768 A CA1126768 A CA 1126768A
- Authority
- CA
- Canada
- Prior art keywords
- layers
- plates
- sheets
- stack
- foundation
- 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.)
- Expired
Links
Classifications
-
- 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
- E04B1/36—Bearings or like supports allowing movement
-
- 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
- E04H9/0235—Anti-seismic devices with hydraulic or pneumatic damping
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/04—Bearings; Hinges
- E01D19/041—Elastomeric bearings
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Emergency Management (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Business, Economics & Management (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Vibration Prevention Devices (AREA)
- Buildings Adapted To Withstand Abnormal External Influences (AREA)
- Springs (AREA)
- Combined Devices Of Dampers And Springs (AREA)
Abstract
ABSTRACT
A bearing device for a structure on its foundation comprises a stack of parallel sheets between which are vulcanized layers of elastic elastomer.
Spaces are arranged between at least two sheets within the contour of these layers, which spaces are filled at least with a substance capable of absorbing at least a part of the energy which entails its deformation.
A bearing device for a structure on its foundation comprises a stack of parallel sheets between which are vulcanized layers of elastic elastomer.
Spaces are arranged between at least two sheets within the contour of these layers, which spaces are filled at least with a substance capable of absorbing at least a part of the energy which entails its deformation.
Description
BEARING DEVICE WITH HIGH INTERNAL
DAMPING FOR CONSTRUCTIONS
TECHNICAL F]ELD
The present invention relat;es to a bearing device having a high internal damping in order to render the structures supported or their foundations less sensi~
tive to the effects of dynamic stresses whatever their origin (strong gusts of wind, braking effect of heavy vehicles) and possibly of earth tremors, particularly for structures requiring very high security, such as atomic power stations.
BACKGROUND ART
To reduce the destructive effect of earth tremors, bearing devices have already been proposed which allow the supported structure to slide with respect to its foundation when the stress exceeds a certain threshold.
Bearing devices are also known whereby viscous materials are forced between parallel plates, when subject to stress.
The drawback of such devices is that, for example in the case of an earth tremor, the structure is moved and must be returned into position, for example with the aid of jacks, since these devices do not comprise return means for returning the structure and its founda-tion into mean position. They are consequently unsuit-able for withstanding the forces of braking or of the wind.
So-called "metal hooped elastomer" supports are also known which constitute a superposition of layers of elastomer separated by steel sheets to which these ,' .~
., ' ' ''' ' ' ' ' ' ' ' ' "~
. .' " . " .
i8 layers adhere to prevent crushing thereof. Upon a relative lateral displacement of the structure and the foundation, the support under-goes a distortion and its elasticity at least partly prevents the transmission of the horizontal force which provoked the displace-ment.
Although this known device spontaneously returns the structure and its foundation into mean position, it has the draw-back of a low damping effect. In the case of successive tremors, an accumulation of energy is produced in the elastomer and, by the effect of resonance or "see-saw" effect, the force transmitted may increase until the structure is ruined. In fact, experience has shown that the broad spectrum of the earth tremors includes the proper oscillation frequency or frequencies of the structure support~d.
SUMMA~Y OF INVENTION
The invention enables the effect of damping of the sudden stresses to be associated with the effect of return to a mean position in the bearing connection between a structure and its foundation.
According to one aspect of the invention there is pro-vided a bearing device interposed between a structure and its foundation comprising a continuous upper plate and a continuous lower plate respectively contacting said structure and foundation;
a stack of spaced apart parallel continuous metal sheets between and spaced apart from said plates; and a further stack of layers each comprising a central visco-elastic elastomer and a peripheral ' ~ ~
7fi~3 strictly elastic elastomer sandwiched between and vulcanized to said plates and sheets for tight adherence thereto.
According to another aspect of the invention there is provided a bearing device interposecl between a structure and its foundation comprising a continuous upper plate and a continuous lower plate respectively contacting said structure and foundation;
a stack of spaced apart parallel metal sheets between and spaced apart from said plates; a further stack of layers of elastic elastomer sandwiched between and vulcanized to said plates and sheets for tight adherence thereto, each of said layers having at least one aperture therewithin; a filling of the spaces internally comprised in the apertures of said layers, said filling comprising a viscous fluid capable of absorbing, by shearing and lamination, at least part of the energy provoking its deformation; and includ-ing an intermediate flat plate disposed in each of said apertures, said intermediate flat plates having beveled side edges, there being a narrow gap between one of the faces of said intermediate flat plates and the respective adjacent ones of said sheets and upper and lower plates, and a peripheral channel between said beveled side edges of said intermediate flat plates and the respective adjacent walls of said apertures.
According to a further aspect of the invention there is provided a bearing device interposed between a structure and its foundation comprising a continuous upper plate and a continuous lower plate respectively contacting said structure and foundation;
a stack of spaced apart parallel metal sheets between and spaced - - , ~." ..~ .
: . .
apart from said plates; a further stack of layers of elastic elastomer sandwiched between and vulcanized to said plates and sheets for tight adherence thereto, each of said layers having at least one aperture therewithin; a filling of the spaces internally comprised in the apertures of said layers, said filling comprising a viscous fluid capable of absorbing, by shearing and lamination, at least part of the energy provo]cing its deformation; and wherein each of said metal sheets has at least one aperture therewithin, said apertures in said layers and sheets being superposed upon each other to form a cavity; and including a third stack of spaced apart parallel plates disposed in said cavity between and spaced apart from said upper and lower plates, said plates of said third stack being fastened alternately to one of said upper and lower plates and the sidewalls of said cavity, said viscous fluid filling the spaces internally comprised in said cavity~
According to yet another aspect of the invention there is provided a bearing device interposed between a structure and its foundation comprising a continuous upper plate and a continuous lower plate respectively contacting said structure and foundation;
a stack of spaced apart parallel metal sheets between and spaced apart from said plates; a further stack of layers of elastic elastomer sandwiched between and vulcanized to said plates and sheets for tight adherence thereto, each of said layers having at least one aperture therewithin; a filling of the spaces internally comprised in the apertures of said layers, said filling comprising a viscous fluid capable of absorbing, by shearing and lamination, .~
~ -4-at least part of the energy provoking its deformation; and includ-ing circulation means affixed to the plates and sheets disposed on the upper and lower ends of said apertures which limit the spaces enclosing said viscous fluid for provoking, by relative displacement of said plates and sheets, a circulation of said viscous fluid.
According to a still further aspect of the invention there is provided a bearing device interposed between a structure and its earth foundation, comprising: a stack of parallel, con-tinuous and coextensive metal sheets; annular layers of elasticelastomer at least coextensive with said metal sheets, each annular layer being interposed between and vulcanized to two of said metal sheets for tight adherence thereto; and layers of viscoelastic elastomer of the same thickness as said annular layers, each of said layers of viscoelastic elastomer being interposed between and vulcanized to two of said metal sheets for tight adherence thereto and filling the apertures of said annular layers, whereby said annular layers of elastic elastomer prevent creeping of said layers of viscoelastic elastomer and said layers of visco-elastic elastomer absorb at least part of the energy provokingdistortion of the device.
By the United ~tates Patent 3,920,231 assemblies are known which comprise capacities each made of a superposition of annular elastomer layers and steel sheets closed by metal plates and filled with a more or less viscous liquid. In such an -4a ¢
''':
~1i 2~7~3 assembly acting as a spring use is made of the liquid incompress-ibility for limiting distortion of said spring and stiffening the same. However the liquid used is incapable of internal damping. On the contrary in the present invention owing to high viscosity of the matters used a spring damping effect is obtained which is all the more large as the distortion speed of the spring is high.
BRIEF DESCRIPTION OF DRAWINGS
.
The invention will be more readily understood on reading the following description with reference to the accompanying drawings, in which:
-4b-Fig. 1 is a view in perspective of an element of a first embodiment of the invention.
Fig. 2 is a section along the plane II of Fig. 1.
Fig. 3 is a view in vertic:al section of a variant embodiment of that shown in Fiqs. 1 and 2.
~ ig. 4 shows a variant of Fig. 3 in partly en-larged section.
Fig. 5 shows another variant in axial vertical section.
Fig. 6 is a partial plan view of the embodiment shown in Fig. 5.
Figs. 7 and 8 are vertical sections of -two ~ariant embodiments of bearings according to the invention.
BEST MODE OF CARRYING OUT THE INVENTION
Referring now to the drawings, Figs. 1 and 2 show superposed sheets 1 which are connected together in manner known per se by layers of elastic elastomer 2 vulcanized against the opposite faces of these sheets.
The elastomer being flexible, i.e. having a low coefficient of elasticity, the lower sheet resting on a foundation and the upper sheet supporting a structure, said latter may move horizontally in any direction over a distance corresponding to about the height of the stack. After displacement, the elastomer assures the return of the structure to its original position.
To dampen either the forward movement or the return movement of the structure, according to the invention, pellets 3 are housed in the layers of elas-tomer. Such pellets may be made of sand composed of angular grains agglomerated by a highly viscous sub-stance such as pitch, or solid but easily deformable or :: :
.. ~: :
.
destructible. A relative disp:Lacement of the sheets is thus braked by the friction inside the pellets of the grains against one another and by the external friction of the superficial grains against -the faces of the sheets.
In the embodiment shown in Fig. 3, the structure 4 rests on its foundation 5 via t:he stack 6. The latter comprises, between the thick end sheets 31 and 32, respectively connected to the structure and to the foundation, a stack of thinner sheets 33 and of layers of elastomer 34 hollowed out to form the superposed spaces 35 in their central zone.
These spaces may be of any contour, preferably parallel to that of the bearing, which is generally circular or rectangular.
Each cavity contains a plate 36 of which the edges 36a are bevelled to 45 D assuming that the maximum horizontal displacement of one sheet with respect to the other is e~ual to the thickness o the layer of elastomer. The spaces existing in each cavity are filled with pitch (in liquid hot condition), or other highly viscous matter, via tubes 37 and 38 (the former for filling, the latter for evacuation of air~ and channels 39 and 40 pierced in the sheets 33 and plates 36. At the manufacturing stage, these spaces may also be filled with an elastomer of suitable composition without any vulcanizing substance, so that it remains visco-elastic whilst the layers 34 containing the vulcanizing substance adhere to the sheets 33 as well as 31 and 32.
, f~
In such an embodiment, the damping by friction is produced on the one hand in the narrow gaps 44 between the upper face of the plates 36 and the lower faces of the sheets, and on the other hand, in the peripheral channel 40 of each cavity, under the action of the flow of the viscous matter, passing upon a distortion of the bearing ~rom the space which contracts towards the one which expands.
In order to increase this effect of braking by circulation of the viscous liquid (Fig. 4), two sets of concentric frames (or rings) 41 and 42 may be alter-nately fixed to two consecutive or non-consecutive sheets 33 or to the end sheets 31 and 32, the intermed-iate sheets 33 then being hollowed at the center.
Annular conduits 43 are thus arranged in cavities inside the bearing, which conduits, upon distortions of said bearing, drive the viscous matter from their contracted parts towards their expanded parts.
The bearing shown in Fig. 3 may also be made in two parts, namely the annular peripheral part made in a vulcanization mold and the central part constructed in the central space of this peripheral part between the end closing sheets 31 and 32.
The embodiment shown by Figs. 5 and 6 is box-shaped and comprises a bottom 57, an upper wall 58 having a central circular aperture and a lateral wall made of intermediate sheets 59 embedded in elastic elastomer 69.
The inner cylindrical cavity is closed by a lid 60 having a central downwardly directed boss 61 fast with concentric plat discs 62,63,64 having decreasing dia-; - , - , , meters. These discs are surrounded by a cylindrical ring 70 made o~ two separate halves joined at 70a and each embedding the flat half-rings 65 and 66, the inner diameter of the second being larger than the one of the former. Owing to a hole 67 pierced in the lid 60 (and an air escape not shown) the cylindrical cavity is as preceedingly filled with very viscous li~uid such as pitch.
In use, when, under action of a lateral force, by distortion of the elastomers 69 and 70, the whole is distorted, as schematized by the dashed and dotted line 68, the high viscous matter included between the discs 62, 63, 64 and the half-rings 65 and 66 is squeezed and sheared what largely increases the damping ef~ect only du~ to viscosity.
In Fig. 7, intermediate sheets 52 are distributed between the end reinforcing sheets 51. Two consecutive sheets are separated by a thin layer of elastomer: a peripheral part 53 is made of elastic elastomer having a relatively low damping and an inner part 54 made of visco-elastic elastomer with high internal damping, which the elastomer 53 prevents from creeping between the sheets which imprison it. In the case of Fig. 8, the first elastomer 53 coats the intermediate sheets, this protecting them and further reducing the risks of creeping of the elastomer 54.
Finally, such an embodiment, in which the elasto-mer 54 with a high internal damping is entirely sur-rounded by the elastomer 53 with elastic behavior, is capable of mobility in all directions of the plane of the reinforcing sheets. To limit this mobility, in at _9_ least one direction between the support and the structure supported, resisting stops suitable for the forces encolmtered may be provided.
~ he shape of the bearings in plan (rectangular, square, circular, even annular with two elastïc rings surrounding a plastic ring? depends on the shape and the mass of the structure supported.
: : :
: :. .: : :
DAMPING FOR CONSTRUCTIONS
TECHNICAL F]ELD
The present invention relat;es to a bearing device having a high internal damping in order to render the structures supported or their foundations less sensi~
tive to the effects of dynamic stresses whatever their origin (strong gusts of wind, braking effect of heavy vehicles) and possibly of earth tremors, particularly for structures requiring very high security, such as atomic power stations.
BACKGROUND ART
To reduce the destructive effect of earth tremors, bearing devices have already been proposed which allow the supported structure to slide with respect to its foundation when the stress exceeds a certain threshold.
Bearing devices are also known whereby viscous materials are forced between parallel plates, when subject to stress.
The drawback of such devices is that, for example in the case of an earth tremor, the structure is moved and must be returned into position, for example with the aid of jacks, since these devices do not comprise return means for returning the structure and its founda-tion into mean position. They are consequently unsuit-able for withstanding the forces of braking or of the wind.
So-called "metal hooped elastomer" supports are also known which constitute a superposition of layers of elastomer separated by steel sheets to which these ,' .~
., ' ' ''' ' ' ' ' ' ' ' ' "~
. .' " . " .
i8 layers adhere to prevent crushing thereof. Upon a relative lateral displacement of the structure and the foundation, the support under-goes a distortion and its elasticity at least partly prevents the transmission of the horizontal force which provoked the displace-ment.
Although this known device spontaneously returns the structure and its foundation into mean position, it has the draw-back of a low damping effect. In the case of successive tremors, an accumulation of energy is produced in the elastomer and, by the effect of resonance or "see-saw" effect, the force transmitted may increase until the structure is ruined. In fact, experience has shown that the broad spectrum of the earth tremors includes the proper oscillation frequency or frequencies of the structure support~d.
SUMMA~Y OF INVENTION
The invention enables the effect of damping of the sudden stresses to be associated with the effect of return to a mean position in the bearing connection between a structure and its foundation.
According to one aspect of the invention there is pro-vided a bearing device interposed between a structure and its foundation comprising a continuous upper plate and a continuous lower plate respectively contacting said structure and foundation;
a stack of spaced apart parallel continuous metal sheets between and spaced apart from said plates; and a further stack of layers each comprising a central visco-elastic elastomer and a peripheral ' ~ ~
7fi~3 strictly elastic elastomer sandwiched between and vulcanized to said plates and sheets for tight adherence thereto.
According to another aspect of the invention there is provided a bearing device interposecl between a structure and its foundation comprising a continuous upper plate and a continuous lower plate respectively contacting said structure and foundation;
a stack of spaced apart parallel metal sheets between and spaced apart from said plates; a further stack of layers of elastic elastomer sandwiched between and vulcanized to said plates and sheets for tight adherence thereto, each of said layers having at least one aperture therewithin; a filling of the spaces internally comprised in the apertures of said layers, said filling comprising a viscous fluid capable of absorbing, by shearing and lamination, at least part of the energy provoking its deformation; and includ-ing an intermediate flat plate disposed in each of said apertures, said intermediate flat plates having beveled side edges, there being a narrow gap between one of the faces of said intermediate flat plates and the respective adjacent ones of said sheets and upper and lower plates, and a peripheral channel between said beveled side edges of said intermediate flat plates and the respective adjacent walls of said apertures.
According to a further aspect of the invention there is provided a bearing device interposed between a structure and its foundation comprising a continuous upper plate and a continuous lower plate respectively contacting said structure and foundation;
a stack of spaced apart parallel metal sheets between and spaced - - , ~." ..~ .
: . .
apart from said plates; a further stack of layers of elastic elastomer sandwiched between and vulcanized to said plates and sheets for tight adherence thereto, each of said layers having at least one aperture therewithin; a filling of the spaces internally comprised in the apertures of said layers, said filling comprising a viscous fluid capable of absorbing, by shearing and lamination, at least part of the energy provo]cing its deformation; and wherein each of said metal sheets has at least one aperture therewithin, said apertures in said layers and sheets being superposed upon each other to form a cavity; and including a third stack of spaced apart parallel plates disposed in said cavity between and spaced apart from said upper and lower plates, said plates of said third stack being fastened alternately to one of said upper and lower plates and the sidewalls of said cavity, said viscous fluid filling the spaces internally comprised in said cavity~
According to yet another aspect of the invention there is provided a bearing device interposed between a structure and its foundation comprising a continuous upper plate and a continuous lower plate respectively contacting said structure and foundation;
a stack of spaced apart parallel metal sheets between and spaced apart from said plates; a further stack of layers of elastic elastomer sandwiched between and vulcanized to said plates and sheets for tight adherence thereto, each of said layers having at least one aperture therewithin; a filling of the spaces internally comprised in the apertures of said layers, said filling comprising a viscous fluid capable of absorbing, by shearing and lamination, .~
~ -4-at least part of the energy provoking its deformation; and includ-ing circulation means affixed to the plates and sheets disposed on the upper and lower ends of said apertures which limit the spaces enclosing said viscous fluid for provoking, by relative displacement of said plates and sheets, a circulation of said viscous fluid.
According to a still further aspect of the invention there is provided a bearing device interposed between a structure and its earth foundation, comprising: a stack of parallel, con-tinuous and coextensive metal sheets; annular layers of elasticelastomer at least coextensive with said metal sheets, each annular layer being interposed between and vulcanized to two of said metal sheets for tight adherence thereto; and layers of viscoelastic elastomer of the same thickness as said annular layers, each of said layers of viscoelastic elastomer being interposed between and vulcanized to two of said metal sheets for tight adherence thereto and filling the apertures of said annular layers, whereby said annular layers of elastic elastomer prevent creeping of said layers of viscoelastic elastomer and said layers of visco-elastic elastomer absorb at least part of the energy provokingdistortion of the device.
By the United ~tates Patent 3,920,231 assemblies are known which comprise capacities each made of a superposition of annular elastomer layers and steel sheets closed by metal plates and filled with a more or less viscous liquid. In such an -4a ¢
''':
~1i 2~7~3 assembly acting as a spring use is made of the liquid incompress-ibility for limiting distortion of said spring and stiffening the same. However the liquid used is incapable of internal damping. On the contrary in the present invention owing to high viscosity of the matters used a spring damping effect is obtained which is all the more large as the distortion speed of the spring is high.
BRIEF DESCRIPTION OF DRAWINGS
.
The invention will be more readily understood on reading the following description with reference to the accompanying drawings, in which:
-4b-Fig. 1 is a view in perspective of an element of a first embodiment of the invention.
Fig. 2 is a section along the plane II of Fig. 1.
Fig. 3 is a view in vertic:al section of a variant embodiment of that shown in Fiqs. 1 and 2.
~ ig. 4 shows a variant of Fig. 3 in partly en-larged section.
Fig. 5 shows another variant in axial vertical section.
Fig. 6 is a partial plan view of the embodiment shown in Fig. 5.
Figs. 7 and 8 are vertical sections of -two ~ariant embodiments of bearings according to the invention.
BEST MODE OF CARRYING OUT THE INVENTION
Referring now to the drawings, Figs. 1 and 2 show superposed sheets 1 which are connected together in manner known per se by layers of elastic elastomer 2 vulcanized against the opposite faces of these sheets.
The elastomer being flexible, i.e. having a low coefficient of elasticity, the lower sheet resting on a foundation and the upper sheet supporting a structure, said latter may move horizontally in any direction over a distance corresponding to about the height of the stack. After displacement, the elastomer assures the return of the structure to its original position.
To dampen either the forward movement or the return movement of the structure, according to the invention, pellets 3 are housed in the layers of elas-tomer. Such pellets may be made of sand composed of angular grains agglomerated by a highly viscous sub-stance such as pitch, or solid but easily deformable or :: :
.. ~: :
.
destructible. A relative disp:Lacement of the sheets is thus braked by the friction inside the pellets of the grains against one another and by the external friction of the superficial grains against -the faces of the sheets.
In the embodiment shown in Fig. 3, the structure 4 rests on its foundation 5 via t:he stack 6. The latter comprises, between the thick end sheets 31 and 32, respectively connected to the structure and to the foundation, a stack of thinner sheets 33 and of layers of elastomer 34 hollowed out to form the superposed spaces 35 in their central zone.
These spaces may be of any contour, preferably parallel to that of the bearing, which is generally circular or rectangular.
Each cavity contains a plate 36 of which the edges 36a are bevelled to 45 D assuming that the maximum horizontal displacement of one sheet with respect to the other is e~ual to the thickness o the layer of elastomer. The spaces existing in each cavity are filled with pitch (in liquid hot condition), or other highly viscous matter, via tubes 37 and 38 (the former for filling, the latter for evacuation of air~ and channels 39 and 40 pierced in the sheets 33 and plates 36. At the manufacturing stage, these spaces may also be filled with an elastomer of suitable composition without any vulcanizing substance, so that it remains visco-elastic whilst the layers 34 containing the vulcanizing substance adhere to the sheets 33 as well as 31 and 32.
, f~
In such an embodiment, the damping by friction is produced on the one hand in the narrow gaps 44 between the upper face of the plates 36 and the lower faces of the sheets, and on the other hand, in the peripheral channel 40 of each cavity, under the action of the flow of the viscous matter, passing upon a distortion of the bearing ~rom the space which contracts towards the one which expands.
In order to increase this effect of braking by circulation of the viscous liquid (Fig. 4), two sets of concentric frames (or rings) 41 and 42 may be alter-nately fixed to two consecutive or non-consecutive sheets 33 or to the end sheets 31 and 32, the intermed-iate sheets 33 then being hollowed at the center.
Annular conduits 43 are thus arranged in cavities inside the bearing, which conduits, upon distortions of said bearing, drive the viscous matter from their contracted parts towards their expanded parts.
The bearing shown in Fig. 3 may also be made in two parts, namely the annular peripheral part made in a vulcanization mold and the central part constructed in the central space of this peripheral part between the end closing sheets 31 and 32.
The embodiment shown by Figs. 5 and 6 is box-shaped and comprises a bottom 57, an upper wall 58 having a central circular aperture and a lateral wall made of intermediate sheets 59 embedded in elastic elastomer 69.
The inner cylindrical cavity is closed by a lid 60 having a central downwardly directed boss 61 fast with concentric plat discs 62,63,64 having decreasing dia-; - , - , , meters. These discs are surrounded by a cylindrical ring 70 made o~ two separate halves joined at 70a and each embedding the flat half-rings 65 and 66, the inner diameter of the second being larger than the one of the former. Owing to a hole 67 pierced in the lid 60 (and an air escape not shown) the cylindrical cavity is as preceedingly filled with very viscous li~uid such as pitch.
In use, when, under action of a lateral force, by distortion of the elastomers 69 and 70, the whole is distorted, as schematized by the dashed and dotted line 68, the high viscous matter included between the discs 62, 63, 64 and the half-rings 65 and 66 is squeezed and sheared what largely increases the damping ef~ect only du~ to viscosity.
In Fig. 7, intermediate sheets 52 are distributed between the end reinforcing sheets 51. Two consecutive sheets are separated by a thin layer of elastomer: a peripheral part 53 is made of elastic elastomer having a relatively low damping and an inner part 54 made of visco-elastic elastomer with high internal damping, which the elastomer 53 prevents from creeping between the sheets which imprison it. In the case of Fig. 8, the first elastomer 53 coats the intermediate sheets, this protecting them and further reducing the risks of creeping of the elastomer 54.
Finally, such an embodiment, in which the elasto-mer 54 with a high internal damping is entirely sur-rounded by the elastomer 53 with elastic behavior, is capable of mobility in all directions of the plane of the reinforcing sheets. To limit this mobility, in at _9_ least one direction between the support and the structure supported, resisting stops suitable for the forces encolmtered may be provided.
~ he shape of the bearings in plan (rectangular, square, circular, even annular with two elastïc rings surrounding a plastic ring? depends on the shape and the mass of the structure supported.
: : :
: :. .: : :
Claims (11)
PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A bearing device interposed between a structure and its foundation comprising a continuous upper plate and a continuous lower plate respectively contacting said structure and foundation; a stack of spaced apart parallel continuous metal sheets between and spaced apart from said plates; and a further stack of layers each comprising a central visco-elastic elastomer and a peripheral strictly elastic elastomer sandwiched between and vulcanized to said plates and sheets for tight adherence thereto.
2. A device according to claim 1 wherein said layers of said further stack are coextensive with said sheets and wherein the contour of the central viscoelastic portion of each layer is parallel to the contour of said sheets and at constant distance of said latter contour.
3. A device according to claim 2 wherein the edges of said sheets are embedded in further layers of elastic elastomer vulcanized to the edges of said elastomer layers of said further stack.
4. A bearing device interposed between a structure and its foundation comprising a continuous upper plate and a continuous lower plate respectively contacting said structure and foundation; a stack of spaced apart parallel metal sheets between and spaced apart from said plates; a further stack of layers of elastic elastomer sandwiched between and vulcanized to said plates and sheets for tight adherence thereto, each of said layers having at least one aperture therewithin; a filling of the spaces internally comprised in the apertures of said layers, said filling comprising a viscous fluid capable of absorbing, by shearing and lamination, at least part of the energy provoking its deformation; and including an intermediate flat plate disposed in each of said apertures, said intermediate flat plates having beveled side edges, there being a narrow gap between one of the faces of said intermediate flat plates and the respective adjacent ones of said sheets and upper and lower plates, and a peripheral channel between said beveled side edges of said intermediate flat plates and the respective adjacent walls of said apertures.
5. A bearing device interposed between a structure and its foundation comprising a continuous upper plate and a continuous lower plate respectively contacting said structure and foundation; a stack of spaced apart parallel metal sheets between and spaced apart from said plates; a further stack of layers of elastic elastomer sandwiched between and vulcanized to said plates and sheets for tight adherence thereto, each of said layers having at least one aperture therewithin; a filling of the spaces internally comprised in the apertures of said layers, said filling comprising a viscous fluid capable of absorbing, by shearing and lamination, at least part of the energy provoking its deformation;
and wherein each of said metal sheets has at least one aperture therewithin, said apertures in said layers and sheets being superposed upon each other to form a cavity; and including a third stack of spaced apart parallel plates disposed in said cavity between and spaced apart from said upper and lower plates, said plates of said third stack being fastened alternately to one of said upper and lower plates and the sidewalls of said cavity, said viscous fluid filling the spaces internally comprised in said cavity.
and wherein each of said metal sheets has at least one aperture therewithin, said apertures in said layers and sheets being superposed upon each other to form a cavity; and including a third stack of spaced apart parallel plates disposed in said cavity between and spaced apart from said upper and lower plates, said plates of said third stack being fastened alternately to one of said upper and lower plates and the sidewalls of said cavity, said viscous fluid filling the spaces internally comprised in said cavity.
6. A device according to claim 5, said cavity being cylindrical in shape, and including a hollow cylindrical body of elastic elastomer disposed in said cavity and having an outer diameter substantially equal to the diameter of said cavity, said upper plate having an opening therein superposed on said cavity and including a lid disposed in and closing said opening in said upper plate, said lid having a boss extending downwardly therefrom, said plates of said third stack comprising a plurality of staggered concentric discs carried by said boss and a plurality of rings interposed between said discs, the outer peripheries of said rings being embedded in said hollow cylindrical body.
7. A device according to claim 6, wherein said rings comprise pairs of half-rings joined together.
8. A device according to claim 6, wherein said hollow cylindrical body comprises a pair of hollow half-cylinders joined together.
9. A bearing device interposed between a structure and its foundation comprising a continuous upper plate and a continuous lower plate respectively contacting said structure and foundation; a stack of spaced apart parallel metal sheets between and spaced apart from said plates; a further stack of layers of elastic elastomer sandwiched between and vulcanized to said plates and sheets for tight adherence thereto, each of said layers having at least one aperture therewithin; a filling of the spaces internally comprised in the apertures of said layers, said filling comprising a viscous fluid capable of absorbing, by shearing and lamination, at least part of the energy provoking its deformation; and including circulation means affixed to the plates and sheets disposed on the upper and lower ends of said apertures which limit the spaces enclosing said viscous fluid for provoking, by relative displacement of said plates and sheets, a circulation of said viscous fluid.
10. A device according to claim 9, wherein said circulation means includes concentric frames alternately affixed to the plates and sheets at such upper and lower ends of said apertures.
11. A bearing device interposed between a structure and its earth foundation, comprising:
a stack of parallel, continuous and coextensive metal sheets;
annular layers of elastic elastomer at least coextensive with said metal sheets, each annular layer being interposed between and vulcanized to two of said metal sheets for tight adherence thereto; and layers of viscoelastic elastomer of the same thickness as said annular layers, each of said layers of viscoelastic elastomer being interposed between and vulcanized to two of said metal sheets for tight adherence thereto and filling the apertures of said annular layers, whereby said annular layers of elastic elastomer prevent creeping of said layers of viscolastic elastomer and said layers of viscoelastic elastomer absorb at least part of the energy provoking distortion of the device.
a stack of parallel, continuous and coextensive metal sheets;
annular layers of elastic elastomer at least coextensive with said metal sheets, each annular layer being interposed between and vulcanized to two of said metal sheets for tight adherence thereto; and layers of viscoelastic elastomer of the same thickness as said annular layers, each of said layers of viscoelastic elastomer being interposed between and vulcanized to two of said metal sheets for tight adherence thereto and filling the apertures of said annular layers, whereby said annular layers of elastic elastomer prevent creeping of said layers of viscolastic elastomer and said layers of viscoelastic elastomer absorb at least part of the energy provoking distortion of the device.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7816289A FR2427446A1 (en) | 1978-05-31 | 1978-05-31 | SEISMIC DAMPERING DEVICE FOR CONSTRUCTION |
| FR7816289 | 1978-05-31 | ||
| FR7833995 | 1978-12-01 | ||
| FR7833995A FR2442941A2 (en) | 1978-12-01 | 1978-12-01 | STRONG INTERNAL DAMPING SUPPORT DEVICE |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1126768A true CA1126768A (en) | 1982-06-29 |
Family
ID=26220615
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA328,676A Expired CA1126768A (en) | 1978-05-31 | 1979-05-30 | Bearing device with high internal damping for constructions |
Country Status (8)
| Country | Link |
|---|---|
| BR (1) | BR7903404A (en) |
| CA (1) | CA1126768A (en) |
| DE (1) | DE2921828C2 (en) |
| ES (1) | ES481069A1 (en) |
| GB (1) | GB2034436B (en) |
| IT (1) | IT1121053B (en) |
| PT (1) | PT69708A (en) |
| YU (1) | YU40996B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106759928A (en) * | 2017-02-16 | 2017-05-31 | 许昌义 | Level to and the vertical shock isolating pedestal to combination |
Families Citing this family (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3006010A1 (en) * | 1980-02-18 | 1981-08-20 | Oskar Dipl.-Ing. Dr.rer.nat. 8000 München Bschorr | DAMPING OF CONSTRUCTIONS |
| HU180621B (en) * | 1981-01-08 | 1983-03-28 | Budapesti Mueszaki Egyetem | Shock absorber insert set |
| US4429450A (en) * | 1981-08-26 | 1984-02-07 | Dixon International Limited | Method of making structural bearings |
| DE3209120C1 (en) * | 1982-03-12 | 1987-10-01 | Boris Dr-Ing Topaloff | Reinforced elastomer bearing for supporting heavy components, especially on bridges |
| TR22754A (en) * | 1983-06-21 | 1988-06-14 | Dev Finacne Corp Of New Zeland | ENERGY ABSORBERS OR RELATED REPORTS |
| US4627635A (en) * | 1983-09-20 | 1986-12-09 | Koleda Michael T | Vibration damping units and vibration damped products |
| NZ208129A (en) * | 1984-05-11 | 1988-10-28 | New Zealand Dev Finance | Shear energy absorber: confined granular material within deformable block |
| DE3611809A1 (en) * | 1986-04-08 | 1987-10-15 | Tang Shengwei | Arrangement for protecting buildings against earthquakes |
| US5233800A (en) * | 1986-10-28 | 1993-08-10 | Sumitomo Gomu Kogyo Kabushiki Kaisha | Earthquake-proofing device of peripherally restraining type |
| DE3769980D1 (en) * | 1986-10-28 | 1991-06-13 | Sumitomo Rubber Ind | VIBRANT STRUCTURE. |
| US5335463A (en) * | 1991-09-16 | 1994-08-09 | Per Reinhall | Composition for vibration damping |
| JPH06101740A (en) * | 1992-08-07 | 1994-04-12 | Sumitomo Rubber Ind Ltd | Lamination rubber support |
| FR2708694B1 (en) * | 1993-07-29 | 1995-10-06 | Hutchinson | Improvement to anti-vibration supports. |
| US5438806A (en) * | 1993-12-13 | 1995-08-08 | Reinhall; Per | Composition for vibration damping |
| CN104763066B (en) * | 2015-03-13 | 2017-01-18 | 上海宝冶集团有限公司 | Three-dimensional shock isolation device |
| CN105544766B (en) * | 2016-01-29 | 2018-04-06 | 上海堃熠工程减震科技有限公司 | A kind of small-sized fluid linking damper |
| CN108517979B (en) * | 2018-02-26 | 2019-07-26 | 北京建筑大学 | A kind of damping device and its installation method |
| CN109837833B (en) * | 2019-02-14 | 2020-11-03 | 张苇 | Bridge vibration damper |
| CN114517534B (en) * | 2020-11-19 | 2024-06-04 | 倪文兵 | Shock insulation support with vibration liquefaction material |
| CN115233504B (en) * | 2022-07-26 | 2024-06-18 | 中铁桥研科技有限公司 | Compact high-frequency tuning liquid mass damper and design method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1180205A (en) * | 1957-07-26 | 1959-06-02 | Stup Procedes Freyssinet | Support device in particular for engineering structures |
| GB1429308A (en) * | 1972-04-17 | 1976-03-24 | Dunlop Ltd | Railway vehicles |
| US4033005A (en) * | 1974-12-20 | 1977-07-05 | Felt Products Mfg. Co. | Bearing pad assembly |
| FR2370900A1 (en) * | 1976-11-10 | 1978-06-09 | Europ Propulsion | FLEXIBLE STOPPER PART |
-
1979
- 1979-05-29 YU YU1249/79A patent/YU40996B/en unknown
- 1979-05-29 IT IT23087/79A patent/IT1121053B/en active
- 1979-05-29 DE DE2921828A patent/DE2921828C2/en not_active Expired
- 1979-05-30 BR BR7903404A patent/BR7903404A/en unknown
- 1979-05-30 CA CA328,676A patent/CA1126768A/en not_active Expired
- 1979-05-30 PT PT69708A patent/PT69708A/en unknown
- 1979-05-30 GB GB7918849A patent/GB2034436B/en not_active Expired
- 1979-05-30 ES ES481069A patent/ES481069A1/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106759928A (en) * | 2017-02-16 | 2017-05-31 | 许昌义 | Level to and the vertical shock isolating pedestal to combination |
| CN106759928B (en) * | 2017-02-16 | 2019-04-16 | 南京禹智智能科技有限公司 | Horizontal direction and vertically to combined shock isolating pedestal |
Also Published As
| Publication number | Publication date |
|---|---|
| ES481069A1 (en) | 1979-11-16 |
| IT1121053B (en) | 1986-03-26 |
| DE2921828A1 (en) | 1979-12-06 |
| YU40996B (en) | 1986-10-31 |
| YU124979A (en) | 1982-08-31 |
| GB2034436A (en) | 1980-06-04 |
| GB2034436B (en) | 1982-12-08 |
| DE2921828C2 (en) | 1983-02-10 |
| PT69708A (en) | 1979-06-01 |
| IT7923087A0 (en) | 1979-05-29 |
| BR7903404A (en) | 1980-03-18 |
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Legal Events
| Date | Code | Title | Description |
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| MKEX | Expiry |