WO2006126896A1 - Accouplement à friction à absorption d’énergie et à limitation de force - Google Patents

Accouplement à friction à absorption d’énergie et à limitation de force Download PDF

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Publication number
WO2006126896A1
WO2006126896A1 PCT/NZ2006/000128 NZ2006000128W WO2006126896A1 WO 2006126896 A1 WO2006126896 A1 WO 2006126896A1 NZ 2006000128 W NZ2006000128 W NZ 2006000128W WO 2006126896 A1 WO2006126896 A1 WO 2006126896A1
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WO
WIPO (PCT)
Prior art keywords
friction
force
frictional
absorbing
energy
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.)
Ceased
Application number
PCT/NZ2006/000128
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English (en)
Inventor
Geoffrey John Thompson
Steven Craig Cassidy
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Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to US11/921,018 priority Critical patent/US20090133338A1/en
Priority to CN2006800181049A priority patent/CN101238265B/zh
Priority to EP06747705A priority patent/EP1885975A1/fr
Priority to JP2008513393A priority patent/JP4964231B2/ja
Publication of WO2006126896A1 publication Critical patent/WO2006126896A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F7/00—Vibration-dampers; Shock-absorbers
    • F16F7/12—Vibration-dampers; Shock-absorbers using plastic deformation of members
    • F16F7/125—Units with a telescopic-like action as one member moves into, or out of a second member
    • 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
    • E04H9/0237—Structural braces with damping devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F7/00—Vibration-dampers; Shock-absorbers
    • F16F7/08—Vibration-dampers; Shock-absorbers with friction surfaces rectilinearly movable along each other
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F7/00—Vibration-dampers; Shock-absorbers
    • F16F7/08—Vibration-dampers; Shock-absorbers with friction surfaces rectilinearly movable along each other
    • F16F7/09—Vibration-dampers; Shock-absorbers with friction surfaces rectilinearly movable along each other in dampers of the cylinder-and-piston type
    • 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
    • E04H9/028—Earthquake withstanding shelters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49616—Structural member making
    • Y10T29/49623—Static structure, e.g., a building component

Definitions

  • This invention relates to coupling devices for absorbing unwanted kinetic energy by passively converting kinetic energy into heat and for limiting forces by slipping at a predetermined load. More particularly the invention relates to passive energy dissipation devices for use in protecting structures such as buildings, for reducing damage during earthquakes.
  • residual tension is a force developed as a sequel of a stretching type of distortion that is implanted within the device at the time of manufacture and maintained indefinitely by virtue of principally elastic and related properties of the materials involved.
  • residual compression is a force developed as a sequel of a compressional type of distortion that is implanted within the device at the time of manufacture and maintained indefinitely by virtue of principally elastic and related properties of the materials involved.
  • Artificial structures such as buildings, bridges or other structures that are erected in sites where earthquakes comprise a risk may include means to prevent damage that would otherwise be a consequence of ground movement during a "significant" earthquake by which we mean one that could cause structural damage to buildings. Any earthquake is of limited although unpredictable duration and amplitude related to the relatively unpredictable amount of pent-up energy to be released. Given that unpredictability, inclusion of means to prevent excessive movement (of a substantially elastic type) may on occasion be insufficient to prevent damage, but at least the risk is reduced. In the absence of dedicated devices adapted for the dissipation of energy, some portions of a structure exhibit inelastic behaviour and may damp movement to some extent but usually this is at the cost of permanent damage or failure to those parts of the structure.
  • Another approach is to introduce ductility into a structure by using a dedicated device. Typical forces such as those caused by internal loading, design wind loading, and thermal expansion or contraction would not be sufficient to activate the means to resist yet allow movement. It is usual for such means to resist a force of less than a given threshold without inelastic deformation, and beyond that threshold to deform in a way which absorbs energy, dampens the motion caused by the force, and limits the forces transmitted to other parts of the structure.
  • a means to resist but allow limited movement of the structure exposed to seismically induced shaking should provide damping of possible resonance in the structure (in any mode). This is desirable because resonant movement may exaggerate the initial magnitude of vibration and could lead to collapse of the structure.
  • a means to resist but allow controlled movement should desirably be designed so that that the forces transmitted to any individual element are limited to less than that which would cause failure of the element.
  • the means should also be designed so that the forces transmitted to any individual element are limited and so accelerations in the structure are also limited.
  • Sliding friction dampers such as that described in US patent 5560162 to Kemeny, use a seismic brake comprising a shaft journalled through a split gripping block which frictionally engages the shaft.
  • the gripping block is provided with a liner, and the friction between the liner and the shaft can be adjusted by adjusting the clamping force created by the gripping blocks.
  • the clamping force is created by bolts drawing the two halves of the gripping block together thus producing a predominantly uni-axial clamping action on the shaft.
  • This solution may work well, but may be unnecessarily complicated and/or expensive, and calibration of the device may be difficult and unreliable. Further, if a particular friction is specified by a design engineer the field-adjustability of this device may allow it to be changed when in use so that the properties of the damper are outside the specifications.
  • Other objects of the present invention may become apparent from the following description, which is given by way of example only.
  • the invention provides an energy-absorbing and force-limiting friction coupling device for reducing damage arising from movements induced within artificial structures including buildings by events such as earthquakes, wherein the device has a first member extending therefrom and terminating with a first attachment means at an end for fastening to a first structural element, and a second member extending therefrom and terminating with a first attachment means at an end for fastening to a second structural element; a frictional region is provided within the device; the frictional region is occupied by a friction-capable portion of the first member and by a friction- capable portion of the second member, the second member being capable of undergoing frictional, sliding movement over a distance at the frictional region relative to the first member; and wherein friction at the frictional region is ensured by including a clamping means at least partly comprised of a material having elasto-plastic properties about the frictional region for clamping the members together in frictional contact.
  • the clamping means is capable of being pre-loaded with a residual tensile force by imposition of a force sufficient to enter the ductile range of the clamping means and cause yielding to occur within the clamping means so that, when in use, a force of at least a predictable magnitude applied between the first and the second attachment means will cause frictional, sliding movement 90 over a distance and conversion of kinetic energy into heat within the device at the frictional region.
  • the invention provides an energy-absorbing and force-limiting friction coupling device — wherein the clamping means includes a maximised implanted tensile force capable of keeping the first and second members in frictional contact; the tensile force having been implanted within the clamping means at the time of manufacture of the device and having been 95 maximised at the time of manufacture by deforming the material having elasto-plastic properties to at least the point of yield.
  • the invention provides an energy-absorbing and force-limiting friction coupling device wherein the frictional region includes a friction-enhancing material attached to one member and capable of sliding along a portion of the other member.
  • the friction-enhancing material attached to one member is in the form of a hollow cylinder and exists in a state of radial tension while forcibly stretched around and and in frictional contact with a parallel-sided shaft forming the friction-capable portion of the other member.
  • the friction-enhancing material attached to one member is forcibly enclosed within and exists in a state of radial compression and in frictional contact with the other member; the 105 friction-capable portion of the other member comprising an elongated parallel-sided cavity enclosing the friction-enhancing material.
  • the friction-enhancing material is identical with the clamping means (such as, for example, phosphor bronze which is a strong copper alloy).
  • the invention provides an energy-absorbing and force-limiting friction 110 coupling device wherein the frictional region includes apposed frictional surfaces each comprised of a metal.
  • a first frictional surface is comprised of a metal selected from the range including copper and alloys of copper.
  • a second frictional surface is comprised of a steel.
  • a lubricant selected from a range including graphite and plated lead, is included at the time of manufacture.
  • the invention provides a method of making an energy-absorbing and force- limiting friction coupling device as previously described in this section, wherein the residual tensile force is implanted within at least the elastic portion of the clamping means of the device during a 120 process of assembly; during which process a selected shaft comprising the friction-capable part of the first member is forced past the friction-capable part of the second member through an undersized space or aperture; the shaft dimension being selected so that a force applied to the clamping means during the assembly process is sufficient to exceed the yield strength of the clamping means such that at least a portion of the clamping means of the device is caused to enter the ductile range, 125 so that a maximised tensile force present within the elasto-plastic clamping means shall be consistently applied to the frictional area over time.
  • the amount of force applied to the clamping means during manufacture is recorded as a descriptive property applicable to that device during use.
  • the method includes at least one step that pre-selects parts having specified force 130 characteristics and comprises the steps of : -
  • L the length of the friction-enhancing material (assumed to be in the shape of an annulus);
  • Fy the yield stress of the annulus.
  • the method also provides an equivalent formula for use in rotational relative movement.
  • the invention provides an overload release coupling wherein the coupling is capable of transmitting a torque without loss as long as the torque remains below a level corresponding to the commencement of sliding friction, whereupon the overload release coupling will commence to dissipate at least some of the torque in the form of heat.
  • Figures 1 and 2 Diagrams showing how a residual tension maybe implanted within a kinetic energy- absorbing and force-limiting coupling according to the invention, at the time of assembly.
  • Figure 3 Graph of stress v strain for a typical elasto-plastic material, to identify the properties discussed in the accompanying specification with reference to the invention.
  • Figure 4 Perspective sectioned view of a kinetic energy absorbing and force limiting connecting 165 device based on Figs 1 and 2.
  • Figure 5 Perspective view, in section, of an "inside out” version of Fig 4.
  • Figure 6 Perspective view, in section, of a further kinetic energy absorbing and force limiting connecting device with bilayered frictional member and seals.
  • Figure 7 Cross-sectional view of a kinetic energy absorbing and force limiting connecting device 170 intended for service as a type of emergency release coupling for a rotating shaft.
  • Figure 8 Perspective view, in section, of a further kinetic energy absorbing and force limiting connecting device.
  • the frictional portion can be regarded as a collar over a bolt. There is a stop preventing excessive movement in either direction.
  • Figure 9 Perspective view, in section, of a further kinetic energy absorbing and force limiting 175 connecting device; an insert suitable for embedment in suitably reinforced concrete.
  • Figure 10 Perspective view, in section, of a further kinetic energy absorbing and force limiting connecting device; an insert suitable for attachment to reinforcing bars.
  • Figure 11 Force (X axis) v displacement (Y axis) graph showing conversion of kinetic energy into heat by a device according to the invention (Fig 4).
  • Figure 12 (as 12a and 12b): Diagram showing how a tendency of a vertical structure to sway and be distorted, as in an earthquake, is damped by means of the invention placed between beams and columns.
  • Figure 13 Diagram of an implementation for steel beams of the concept of Fig 12b.
  • Figure 14 Diagram showing how a tendency of a vertical structure to rock on its foundations, as in 185 an earthquake, is damped by means of the invention (the Fig 9 example, for instance).
  • Figure 15 (as 15a and 15b): Diagram showing how swaying movement of a vertical structure having intentionally provided sliding tracks upon rigid braces may be damped by means of the invention.
  • Figs 1, 2, and 4 show a conceptual version of this device comprising two parts; a rod 100 that may slide inside a tube 300 which tube for the purpose of illustration includes a portion 200, a "frictional mass” that is adapted to exhibit friction against the rod.
  • the device uses substantial internal friction 195 to impede relative movement of the two parts along or about the axis of the rod. Both static friction and sliding friction are applicable. It should be noted that if the dimensions of the rod alter along its length then the amount of sliding friction obtained will not be constant. A diameter tolerance of about 1 part in 500 is quite adequate.
  • the invention is intended to be installed so that it connects one element of a structure to another using conventional connecting means projecting from each end, 200 where if the force applied to the device is great enough, relative movement within the device occurs; and heat is generated as a result of the built-in friction.
  • the force may arise from an existing force such as 205 gravity, alternatively use of a screw, lever or other machine that amplifies an existing force, or in some cases the force arises from (for example) magnetic attraction, or tension or compression applied through a spring.
  • the force on the frictional interface or surface that is relied upon is caused by a "residual tension” (or residual compression), which is a desired sequel of a supra-yield force that had 210 been applied to one or more of the parts of the device generally referred to herein as a “clamping means” at the time of manufacture. It is maintained indefinitely by virtue of elasto-plastic properties (in particular) of the parts involved when under tension or compression. Steel is a preferred material for the parts involved.
  • Fig 1 shows a shaft 100 and a friction-generating ring 200 before assembly.
  • the zone of contact pressure between the ring 200 and the shaft 100, usefully enhanced by the residual tension, is the region where static and sliding friction is present.
  • the ring which had to be stretched in order to fit over the shaft, now includes tensile forces (arrows 202, the residual tension, ) that tend to restore the diameter of the ring towards its initial size.
  • the tapered end 101 of the shaft is forced into the opening 302 and through a hole 203 in frictional
  • Figs 1, 2 and 4 show a ring 200A that had been deformed by entry into a relatively under-sized enclosing tube 100 provided with a taper 301A at the entry, so that residual compression within the ring seeks to expand the ring against the inside of the tube 100 and thereby promote friction at the zone of contact.
  • the ring is held within a circumferential notch 301A.
  • Practical forms of the invention (Figs 4 - 9) are designed so that the residual tension force has the effect of enhancing a frictional effect at a surface of a frictional mass 200.
  • Fig 3 shows a conventional stress (Y) /strain (X) or force (Y) /displacement (X) graph 310 for a an elasto-plastic material such as steel.
  • the stress or force (vertical axis) represents the tension 202 in the ring-like component 200 in Fig 2, while the strain or displacement can be related to the amount of distortion caused during assembly.
  • the steeply rising part of the curve from the graph origin 311 to 312 is the elastic range; the section from 312 to 313 is the ductile range where inelastic, yielding deformation occurs, and beyond 313 rupture of the material may be expected.
  • 265 or solid rod having a tapered end 101 at one end and suitable connecting means at the other end comprises one sliding part of the device; while the other sliding part that develops friction against the first part in the event of sufficient force being applied to cause motion is made up of tubular (hollow) member 300 having an opening 302 and dilated area 301, inside which factional member 200 is held tightly against shaft 100 at a friction-generating zone between 200 and 100.
  • tubular (hollow) member 300 having an opening 302 and dilated area 301, inside which factional member 200 is held tightly against shaft 100 at a friction-generating zone between 200 and 100.
  • 270 frictional member 200 is restrained from moving up and down by conventional means such as (a) the restricted dimensions of the area that has been deformed, 301, or (as in Fig 5) use of a holding notch
  • connection means for the second part is not shown
  • the part undergoing inelastic deformation is the friction material and the outer band or sleeve which is preferably steel since that material has good properties; better than those of some frictional materials.
  • the frictional material itself has adequate properties, it could be used without a second band or sleeve.
  • some types of phosphor bronze have adequate properties.
  • more than one part will experience tensile forces after the manufacturing process is completed, although only one part is likely to exhibit deformation.
  • These parts include (a) the frictional member 200 and/or (b) the containing outer wall dilated at 301, and/or (c) the shaft 100 inside the frictional
  • the frictional member 200 could be deliberately weakened so that it does not significantly contribute to the clamping force.
  • the outer sleeve 301 receives all the distorting force and subsequently the residual tensile force within it closes the frictional member tightly around the shaft 100, applying all the force at the frictional surface that has to be overcome during passive energy conversion into heat.
  • the resulting properties of the invention as a device passively converting kinetic energy into heat by means of "Coulomb-like friction" are therefore determined at least approximately by (a) dimensions, and (b) materials, so long as at least the yield strength was exceeded and some visible distortion exists, so that inherent tensional forces remain after assembly. Under small amounts of applied force the invention transmits the force without itself undergoing movement of one part relative to another.
  • a clamping means is constructed within the device and is pre-loaded with tension (or compression in some versions) that has the effect of clamping the two members tightly together but will nevertheless allowing sliding friction to occur if the torque applied to one member relative to the
  • FIG. 325 other member exceeds a predetermined limit.
  • the same device such as is illustrated in Figs 4 or 5
  • Fig 7 is a cross-section through a simplified form and practical devices might for example be much shorter.
  • the axis of rotation is the dash-dot line 701.
  • a spline coupling is provided at each end (702 and 703).
  • Other parts are 330 labelled as elsewhere.
  • Other suitable couplings are well-known in the art, such as a keyway, or a gear or a pulley held by a screw impinging on to a flat on a shaft.
  • the manufacturing process preferably verifies that the torque-limiting device, after the forcible assembly step that should involve at least some deformation (but might not be taken into the yield region), does retain reasonably concentric axes of rotation 701 for both the first member (100) and the second member
  • a device of this type may serve to absorb unexpected movement in both rotational and translational directions.
  • the transfer function would be as follows: the output tracks the input, revolution for revolution, in either direction unless the maximum transmissible torque is exceeded, whereupon the output slips and a difference between input power and output power is converted into heat.
  • Applications include vehicles of all types, mowers, agricultural and earth-moving machinery, conveyers, crushers, shredders, propellor drives for boats, food mixers, printing and other 345 machinery, and door and gate operating devices, with a great number of other relevant applications also available.
  • Rotational Torque 2. ⁇ r f ⁇ .L.t.F y
  • the parts are pressed together, preferably while monitoring the force used (as described elsewhere) so that individual devices may be supplied in a pre-calibrated form.
  • Fig 8 shows a bidirectional version of the "Kea" device that may be passed through a vertical beam (enclosed by washers 802, 802A) , and its central shaft 100A--100 may be attached at both ends by screw threads with nuts 801, 801A to, for example, horizontal beams.
  • the nuts 801, 801A may also serve as stops.
  • Figs 9 and 10 illustrate two versions of the "Kea" device suitable for use with reinforced concrete, 365 where for example they may serve to reduce sway of a structure built on top.
  • the Fig 9 version is made with a belled-out base 900 that will tend to resist being pulled from cured concrete, especially if a reinforcing bar parallel to but beneath the surface is passed through the aperture 901.
  • the Fig 10 version is more suited to being welded (1002) by its tubular end 1000 on to a stout bar 1001 - and this version need not be within a mass of concrete.
  • Fig 12 shows a frame structure 1200 and the type of movement (dashed outline) seen in an earthquake
  • Fig 12b shows an example installation in elevation detail where "Kea” devices (1201) may be placed between a stiff vertical beam 1202 and a stiff horizontal beam 1203.
  • Fig 13 is a practical elevation drawing of an installed "Kea” device according to Fig 12b.
  • Fig 14 illustrates how a rigid block structure 1401 might rock upon a rigid base 1402 during an earthquake, although
  • Fig 15a shows a structure 1500 using rigid triangular braces 1501 in combination with a sliding brace and slide bearings 1502 that support the horizontal beams 1203 at each storey
  • Fig 15b shows how a "Kea” device 1201 may be used to dampen sideways movement in the event of an earthquake.
  • the mass or surface against which friction is developed should be dimensionally stable at all times prior to a seismic event and until movement begins, so that the device retains its original calibrated characteristics.
  • the possibility of creep or flow over a period of perhaps many years is likely to exclude fiowable frictional materials having a plastics or composite basis, or lead.
  • the friction means may be relatively thick, for improved strength during manufacture and greater constancy of properties during use over long periods, or may be relatively thin (down to a few mm or less, perhaps sufficient only for use in one earthquake event in order to reduce cost. Only a part and possibly only a thin layer 201 of the frictional member 200 as drawn in Fig 6 may be
  • a lubricant may comprise a graphite-based lubricant, use of a brass-like friction device, or covering the rod with a layer of electroplated lead, and the benefits may be a more even frictional behaviour or less noise during operation. Corrosion protection may be an extra benefit. There is a possibility that a device
  • the inventors propose sealing the opening 302 (see Fig 4) in order to exclude oxygen with (for example) a two-pot epoxy resin mixture at the time of manufacture and advise re-sealing units after an earthquake has fractured each opening (which serves as a telltale).
  • an O-ring seal such as
  • PROCESS FOR SELECTION AND MANUFACTURE PROCESS FOR SELECTION AND MANUFACTURE.
  • the manufacturer proceeds to fill the order by first employing the following approximate formula in order to select parts having suitable characteristics in relation to the threshold force (or 415 torque) at which the kinetic energy absorbing and force limiting connecting means will begin to slip.
  • Rotating Torque 2. ⁇ .r f .L. ⁇ . t.F y
  • T f the radius of the friction surface of the annulus.
  • a lubricant preferably a graphite lubricant, may be provided between the annulus and the shaft.
  • the variable ⁇ in the equations above represents the coefficient of friction of the friction means material against the elongate member with the lubricant present.
  • the formula prescribes components having dimensions capable of performing as required. The formula shown here is an approximation. For example it does not attempt to locate the radius of 430 the mean residual tension force, although such enhancements are available in the literature.
  • each device is assembled (pressed) from parts as previously described in this section, and preferably each device is subjected to quality control comprising (a) unique identification, (b) measurement of properties during assembly, and (c) recording those properties (the assembly force required) on or along with each device.
  • the tapered end 101 of rod 1 requires a machining step.
  • the taper may be provided at the time of manufacture only - as a type of durable hole-widening shaft termination that is capable of being pressed into a too-small aperture to be widened, and is later recovered after pressing for re-use. It may be made of an optimised, hard yet not brittle material, for the purpose.
  • the invention can be supplied in "turnbuckle” form - in which a mounting thread at one end has a reverse thread as compared to a mounting thread at the other end.
  • the "KEA” invention may become fixed in a different amount of extension to that present at installation and this if not adjusted may cause perceptible distortion of non-structural elements.
  • kinetic energy absorbing and force limiting connecting means are also envisaged, 475 for example wharf fenders, vehicle impact barriers, and the like.
  • the "KEA” device is cheaper than existing equivalents, in part because of the simple structure, ease of manufacture, and reduced consumption of non-ferrous or expensive materials.
  • the device can be made with a technology no more complex than that used in the manufacture of 480 bolt-based linkages used in construction.
  • the tapered commencement of the shaft that is used to introduce the wider portion into the device during manufacture may be a re-usable part, made of a hard-wearing material.
  • the "KEA" invention is supplied individually pre-calibrated, and tested, and cannot be adjusted after manufacture, so that a design engineer can be confident that the dynamic behaviour of a structure including the "KEA” invention is and will remain predictable within specifications.
  • the "KEA" invention does not require major alterations to a design for a structure when earthquake resistance is added.
  • the devices can be included within an existing part.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (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)
  • Vibration Prevention Devices (AREA)
  • Vibration Dampers (AREA)

Abstract

L'invention porte sur un dispositif présentant des propriétés d'absorption d'énergie cinétique qui peut être relié entre des points sélectionnés à l'intérieur d'une structure telle qu'un bâtiment situé en zone sismique. Quand une partie pouvant être reliée se déplace contre une autre lors d'un tremblement de terre, la friction est assurée par la tension intégrée à l'intérieur au moment de la fabrication, lorsqu'une partie du dispositif avait été forcée, de manière à céder, à sa position par rapport à une autre pièce. Dans le cadre de son utilisation, le dispositif confère une force d'amortissement si une force appliquée entre ses parties est supérieure ou égale à une force prédéterminée marquant le début de la friction de glissement.
PCT/NZ2006/000128 2005-05-24 2006-05-24 Accouplement à friction à absorption d’énergie et à limitation de force Ceased WO2006126896A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US11/921,018 US20090133338A1 (en) 2005-05-24 2006-05-24 Energy-absorbing and force-limiting friction coupling
CN2006800181049A CN101238265B (zh) 2005-05-24 2006-05-24 能量吸收和力限制摩擦联结器
EP06747705A EP1885975A1 (fr) 2005-05-24 2006-05-24 Accouplement à friction à absorption d'énergie et à limitation de force
JP2008513393A JP4964231B2 (ja) 2005-05-24 2006-05-24 エネルギ吸収・力制限摩擦カップリング

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NZ540316A NZ540316A (en) 2005-05-24 2005-05-24 Kinetic energy-absorbing and force-limiting connecting means
NZ540316 2005-05-24

Publications (1)

Publication Number Publication Date
WO2006126896A1 true WO2006126896A1 (fr) 2006-11-30

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PCT/NZ2006/000128 Ceased WO2006126896A1 (fr) 2005-05-24 2006-05-24 Accouplement à friction à absorption d’énergie et à limitation de force

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US (1) US20090133338A1 (fr)
EP (1) EP1885975A1 (fr)
JP (1) JP4964231B2 (fr)
CN (1) CN101238265B (fr)
NZ (1) NZ540316A (fr)
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CN103982579A (zh) * 2014-05-17 2014-08-13 中国科学技术大学 一种大行程高耗能的形状记忆合金缓冲器
CN107829504A (zh) * 2017-10-29 2018-03-23 刘华 一种用于框架结构的耗能组件
CN108035598A (zh) * 2017-12-18 2018-05-15 黄淮学院 一种半主动/被动混合减震装置

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CN103982579A (zh) * 2014-05-17 2014-08-13 中国科学技术大学 一种大行程高耗能的形状记忆合金缓冲器
CN107829504A (zh) * 2017-10-29 2018-03-23 刘华 一种用于框架结构的耗能组件
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US20090133338A1 (en) 2009-05-28
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CN101238265A (zh) 2008-08-06
JP4964231B2 (ja) 2012-06-27
CN101238265B (zh) 2012-10-10

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