Variable-friction self-resetting energy dissipation damper

Abstract

The invention discloses a variable-friction self-resetting energy dissipation damper, which belongs to the technical field of civil engineering structures, and comprises a baffle plate and a self-resetting device, the self-resetting device comprises a friction rod and an elastic device, the two ends of the friction rod are connected with the baffles respectively, the elastic device is connected with the friction rod, the friction energy dissipation device is arranged on the friction energy dissipation device, and bolts used for being connected with a building are arranged on the baffles. The friction energy consumption device comprises a friction block and a locking block which are coaxially arranged on the friction rod in a sleeving mode, the friction block and the locking block are located between the elastic device and the baffle, and a plurality of shrinkage grooves are formed in the friction block at intervals in the circumferential direction of the friction block; when the elastic device is in a tension and compression state, the locking block applies annular holding force to the friction block, so that friction energy consumption is realized between the friction block and the friction rod; the variable-friction self-resetting energy dissipation damper is always in a pull / press state, drives the inner wedge-shaped block and the friction rod to realize variable-friction energy dissipation, and has the advantages of being capable of supporting complete assembly, recoverable in function, high in self-resetting performance and energy dissipation capacity and the like.

Description

Technical Field

[0001] The invention relates to the technical field of civil engineering structure vibration control, in particular to a variable friction self-resetting energy-consuming damper. Background Art

[0002] Earthquakes, as a highly destructive natural disaster, pose a serious threat to the stability of building structures. In order to effectively resist the damage caused by earthquakes, energy dissipation and shock absorption technology is widely used in engineering practice.

[0003] This energy dissipation and shock absorption technology can effectively absorb earthquake energy by installing energy dissipation devices at specific locations of the structure, reduce the energy transmitted to the main structure, and thus reduce the destructive effect of earthquakes on the building structure. Energy dissipation and shock absorption technology not only significantly reduces the damage to the main structure, but also enhances the self-recovery ability of the structure. It has become an important technical means in modern earthquake-resistant design. Among the many energy dissipation and shock absorption devices, friction dampers are widely used in engineering due to their simple structure, convenient installation, low cost and good energy dissipation effect. Friction dampers consume earthquake energy through the relative sliding of friction surfaces.

[0004] However, existing friction dampers have some problems in practical applications. For example, their self-resetting ability is often negatively correlated with their energy dissipation capacity, resulting in large residual displacement after an earthquake, affecting the long-term performance of the structure and increasing maintenance costs. They lack a targeted adjustment mechanism and are difficult to adapt to different engineering needs. In terms of replaceability, traditional friction dampers are not easy to replace, the replacement rate is not high, and the performance of the damper may be affected during the replacement process. Summary of the invention

[0005] In view of the problems existing in the prior art, the present invention provides a variable friction self-resetting energy-dissipating damper, which solves the problems that the self-resetting ability and energy-dissipating ability of the prior friction damper are negatively correlated, the dismantling performance is low, and the adjustable performance is not provided.

[0006] The present invention is achieved through the following technical solutions: A variable friction self-resetting energy dissipation damper, comprising a baffle, a self-resetting device and a friction energy dissipation device; The self-resetting device comprises a friction rod and an elastic device, both ends of the friction rod are respectively connected to the baffles, the elastic device is connected to the friction rod and is located between the two baffles, at least one end of the elastic device is provided with a friction energy dissipation device, the baffle is provided with a bolt for connecting to the building, one end of the bolt is fixedly connected to the baffle, and the other end passes through another baffle for connecting to the building node; The friction energy dissipation device includes a friction block and a locking block coaxially sleeved on the friction rod, the friction block and the locking block are located between the elastic device and the baffle, the friction block is provided with a plurality of shrinkage grooves at intervals along its circumferential direction, the outer annular surface of the friction block is an inclined surface, and the locking block is provided with a conical groove matching the inclined surface; when the elastic device is in a tension or compression state, the locking block can apply an annular clamping force to the friction block, causing the shrinkage groove to shrink, and friction energy is consumed between the friction block and the friction rod.

[0007] Preferably, an elastic force adjustment device is sleeved on the friction rod and is located between the elastic force device and the baffle plate, and is used to adjust the pressing force of the elastic force device.

[0008] Preferably, the elastic force adjustment device is sleeved on a retaining ring, a nut and a washer on the friction rod, the washer abuts against the baffle, the retaining ring abuts against the end of the elastic device, and the nut is located between the retaining ring and the washer.

[0009] Preferably, the friction block comprises a plurality of inner wedge blocks, and the plurality of inner wedge blocks are arranged on the end surface of the elastic device at intervals along the circumference of the axis of the friction rod.

[0010] Preferably, the inner wall of the inner wedge block is provided with friction patterns, and the outer wall surface is a smooth inclined surface.

[0011] Preferably, the locking block is an outer wedge block, a circular hole is provided at the center of the outer wedge block and is sleeved on the friction rod, a conical groove is provided on one side of the outer wedge block close to the friction block, and the slope of the groove matches the slope of the inner wedge block.

[0012] Preferably, both ends of the friction rod are connected to the baffle via nuts.

[0013] Preferably, one end of the bolt passes through the baffle and is connected to the building node through the node plate.

[0014] Preferably, a cushion block is provided between the node plate and the baffle.

[0015] Preferably, the elastic device is a coil spring.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects: The present application provides a variable friction self-resetting energy-absorbing damper, which adopts a coil spring to provide a reset function, and a wedge-shaped component to realize the variable friction energy-absorbing principle; an interactive design of a force transmission system is adopted to keep the variable friction energy-absorbing system and the reset system under pressure at all times; during the working stage, the reset system and the variable friction energy-absorbing system are separated from each other, and the reset function is positively correlated with the energy-absorbing capacity, thereby having a strong bearing capacity, and outstanding energy-absorbing capacity and self-resetting capacity; the device supports complete assembly, is easy to assemble, and is easy to repair and replace after an earthquake.

[0017] Furthermore, in the variable friction energy dissipation system, the inner arc surface of the inner wedge block is in friction contact with the surface of the friction rod, which makes it easy to achieve variable friction energy dissipation through the relative displacement of the inner wedge block and the friction rod; the wedge end surfaces of the inner wedge block and the outer wedge block are in smooth contact, which makes it easy for the inner wedge block and the outer wedge block to undergo relative displacement; the parallel end surface of the inner wedge block is in smooth contact with the retaining ring of the reset system, which makes it easy for the inner wedge block and the retaining ring of the reset system to undergo relative displacement.

[0018] Furthermore, the device selects coil springs of different stiffness, wedge components of different angles, different preload lengths, different friction surface treatments between the inner wedge blocks and the friction rod, etc., to meet the controllability of the actual project. The device is suitable for self-resetting column bases, self-resetting bridge piers and self-resetting shear walls, and can also be used as a self-resetting support for eccentric support frames, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 It is a schematic diagram of the variable friction self-resetting energy dissipation damper of the present invention; Figure 2 This is a schematic diagram of the decomposition of the variable friction self-resetting energy dissipation damper of the present invention; Figure 3 It is a schematic diagram of the inner wedge block component of the present invention; Figure 4 It is a schematic diagram of the outer wedge block component of the present invention; Figure 5 It is a schematic diagram of a wedge-shaped small unit component of the present invention; Figure 6 It is a schematic diagram of the working state of the variable friction self-resetting energy dissipation damper of the present invention; Figure 7 The load-displacement curve of the variable friction self-resetting energy-absorbing damper of the present invention without applying pre-pressure; Figure 8 The load-displacement curve of the variable friction self-resetting energy-absorbing damper of the present invention when applying pre-pressure; Fig. 9 The total displacement of the variable friction self-resetting energy-consuming damper of the present invention is δ Stress analysis of the device; Fig.10 The total displacement of the variable friction self-resetting energy-consuming damper of the present invention is δ Force analysis of friction rod when Fig.11The total displacement of the variable friction self-resetting energy-consuming damper of the present invention is δ Force analysis of the wedge block inside the time; Fig.12 The total displacement of the variable friction self-resetting energy-consuming damper of the present invention is δ Force analysis of the right retaining ring; Fig.13 It is a finite element model of the variable friction self-resetting energy dissipation damper of the present invention; Fig.14 This is the equivalent stress cloud diagram of the variable friction self-resetting energy dissipation damper of the present invention when the compression displacement is 30 mm; Fig.15 It is the plastic damage diagram of the variable friction self-resetting energy dissipation damper of the present invention when the compression displacement is 30 mm; Fig.16 This is the equivalent stress cloud diagram of the variable friction self-resetting energy dissipation damper of the present invention when the tensile displacement is 30 mm; Fig.17 This is the plastic damage diagram of the variable friction self-resetting energy dissipation damper of the present invention when the tensile displacement is 30 mm; Fig.18 A comparison diagram of hysteresis curves of the variable friction self-resetting energy dissipation damper of the present invention using different helical spring stiffness coefficients; Fig.19 A comparison diagram of hysteresis curves of the variable friction self-resetting energy dissipation damper of the present invention with different preload lengths applied; Fig. 20 A comparison diagram of hysteresis curves of the variable friction self-resetting energy dissipation damper of the present invention using different wedge-shaped component angles; Fig.21 A comparison diagram of hysteresis curves of different friction coefficients between the inner wedge block and the friction rod used in the variable friction self-resetting energy dissipation damper of the present invention; In the figure: left inner baffle 1, right inner baffle 2, left outer baffle 3, right outer baffle 4, left pad 5, right pad 6, left ear plate 7, right ear plate 8, first tension screw 9, second tension screw 10, friction block 11, outer wedge block 12, friction rod 13, left baffle ring 14, right baffle ring 15, coil spring 16, first nut 17, second nut 18, third nut 19, washer 20, inner wedge block 21. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0023] A variable friction self-resetting energy dissipation damper comprises a baffle, a self-resetting device and a friction energy dissipation device.

[0024] The self-resetting device includes a friction rod 13 and an elastic device, both ends of the friction rod are respectively connected to baffles, the elastic device is connected to the friction rod and is located between the two baffles, at least one end of the friction energy dissipation device is provided with a friction energy dissipation device and is located between the elastic device and the baffle, and a bolt for connecting to a building is provided on the baffle, one end of the bolt is connected to the baffle, and the other end passes through another baffle and is connected to a node of the building.

[0025] The friction energy dissipation device comprises a friction block and a locking block coaxially sleeved on a friction rod, the friction block and the locking block are located between an elastic device and a baffle, a plurality of shrinkage grooves are arranged along the circumference of the friction block, an outer ring surface of the friction block is an inclined surface, and a conical groove matching the inclined surface is arranged on the locking block; when the elastic device is in a tension or compression state, the locking block can exert an annular clamping force on the friction block to shrink the shrinkage groove, and friction energy is dissipated between the friction block and the friction rod.

[0026] The variable friction self-resetting energy-absorbing damper, in the working state, uses the inclined surface of the locking block to apply annular pressure to the friction block, so that the shrinkage gap is reduced, and then the locking block applies a clamping force to the friction rod, and friction is generated between the locking block and the friction rod, thereby producing a friction energy-absorbing effect. In the working stage, the reset system and the variable friction energy-absorbing system are separated from each other, and the reset function and the energy-absorbing capacity show a positive correlation, so the bearing capacity is strong, and the energy-absorbing capacity and self-resetting capacity are outstanding; the device supports complete assembly, and is easy to assemble, and convenient to repair and replace after an earthquake.

[0027] In some embodiments, both ends of the friction rod 13 are connected to the baffle through nuts to adjust the preload force of the elastic device.

[0028] Specifically, the baffle includes a left inner baffle 1 and a right inner baffle 2, the elastic device is a coil spring 16, the coil spring 16 is mounted on the friction rod and is located between the two baffles, the two ends of the friction rod pass through the left inner baffle 1 and the right inner baffle 2 respectively and are connected by nuts, and the friction energy dissipation device is located between the right inner baffle 2 and the coil spring 16.

[0029] In some embodiments, four circular holes are provided on the four corners of the left inner baffle plate 1 and the right inner baffle plate 2 , the second tension screw 10 is connected to the right inner baffle plate 2 , and the first tension screw 9 is connected to the left inner baffle plate 1 .

[0030] One end of the second tension screw 10 is connected to the circular hole of the right inner baffle plate 2, and the other end passes through the left inner baffle plate 1 to be connected to the first node plate; one end of the first tension screw 9 is connected to the circular hole of the left inner baffle plate 1, and the other end passes through the right inner baffle plate 2 to be connected to the second node plate. Since the node plate is connected to the building node, the diameter of the circular hole is 22 mm.

[0031] There are four second tension screws 10 and four first tension screws 9, which are located at four corners of the baffle and are arranged in parallel.

[0032] In some embodiments, the node plate includes an outer baffle plate and an ear plate, the outer baffle plate is located on the outside of the baffle plate, the ear plate is welded to the outer baffle plate and is provided with a node hole, a pad is provided between the outer baffle plate and the baffle plate, and the end of the friction rod is located in the space between the outer baffle plate and the baffle plate.

[0033] In this embodiment, the first node plate includes a left outer baffle plate 3 and a left ear plate 7 arranged thereon, and the second node plate includes a right outer baffle plate 4 and a right ear plate 8 arranged thereon.

[0034] The two ends of the friction rod are connected to the baffle with a first nut 17 and a second nut 18 respectively. The first nut 17 is located between the right outer baffle 4 and the right inner baffle 2. A right pad 6 is arranged between the right outer baffle 4 and the right inner baffle 2. The second nut 18 is located between the left inner baffle 1 and the left outer baffle 3. A left pad 5 is arranged between the left inner baffle 1 and the left outer baffle 3.

[0035] The size of the pad is 65mm×65mm×30mm, a fillet with a diameter of 77mm is set at one end of the ear plate, and a circular hole with a diameter of 60mm is opened on the plate surface.

[0036] In some embodiments, the friction rod is provided with an elastic force adjustment device for adjusting the pressing force of the spiral elastic force.

[0037] The elastic force adjustment device is arranged between the left inner baffle plate 1 and the coil spring, and the elastic force adjustment device includes a left baffle ring 14, a third nut 19 and a gasket 20 which are sleeved on the friction rod. The gasket 20 abuts against the left inner baffle plate 1, and the left baffle ring 14 abuts against the end of the coil spring. The third nut 19 is located between the left baffle ring 14 and the gasket 20. The preload force of the coil spring can be adjusted by rotating and moving the position of the third nut 19.

[0038] In some embodiments, the friction block 11 includes a plurality of inner wedge blocks 21, a right retaining ring 15 is provided at the end of the spring, the plurality of inner wedge blocks 21 are arranged on the retaining ring 15 along the circumference of the axis of the friction rod, and gaps (contraction grooves) are provided between the plurality of inner wedge blocks 21, and the inner wedge blocks 21 are connected to the friction rod by friction; for example, the inner wall of the inner wedge block 21 is provided with friction lines, and the outer wall surface of the inner wedge block 21 is a smooth inclined surface.

[0039] The locking block is an outer wedge block 12 , the center of which is provided with a circular hole and is sleeved on the friction rod. A conical groove is provided on one side of the outer wedge block close to the friction block, and the slope of the groove matches the slope of the inner wedge block 21 .

[0040] The inner wedge block 21 includes an inner arc surface, an outer arc surface, side end surface one, side end surface two, annular surface one, annular surface two and a wedge-shaped inclined surface. The four inner wedge blocks 21 are arranged in a ring along the inner arc surface to form a friction block 11, wherein the inner arc surface of the friction block 11 is in rough contact with the outer surface of the friction rod 13.

[0041] The following is combined with Figure 6-12 The working mechanism and load-displacement curve of the variable friction self-resetting energy dissipation damper of this embodiment are described in detail: Figure 6 A schematic diagram of the working state of a variable friction self-resetting energy-absorbing damper provided by the present invention, under interactive design, loading stage: under the action of tension and compression loads, the reset system and the wedge block group of the present invention are always in a compressed state; during the loading process, due to the extrusion of the right retaining ring and the outer wedge block, the inner wedge block tends to move along the surface of the wedge block, and at the same time, the inner wedge block squeezes the friction rod to generate friction on the contact surface of the two, and the friction force increases with the increase of the compression length of the spring, so it has the performance of variable friction energy absorption in this process; unloading stage: under the action of the spring restoring force, the device returns to the initial state, and the friction force between the inner wedge block and the friction rod during the process is opposite to that in the loading stage.

[0042] The present invention provides a force transmission path (right ear plate fixed) of a variable friction self-resetting energy-absorbing damper: when the damper is in a tension state, the load is first transmitted to the left outer baffle plate through the left ear plate at the loading end, and then sequentially transmitted to the second tension screw, the right inner baffle plate, the variable friction energy-absorbing system, the reset system and the left inner baffle plate, and further transmitted to the right outer baffle plate and the fixed end of the right ear plate by the first tension screw; when the damper is in a compression state, the load is first transmitted to the left outer baffle plate through the left ear plate at the loading end, and then sequentially transmitted to the left pad, the left inner baffle plate, the reset system, the variable friction energy-absorbing system and the right inner baffle plate, and further transmitted to the right inner baffle plate and the fixed end of the right ear plate by the right pad.

[0043] Figure 7 and Figure 8 The load-displacement curves of the present invention without and with preload are shown respectively. During loading and unloading, the load-displacement curves of the loading and unloading processes are triangular due to the change in the stiffness of the device. Preload is applied to the coil spring by nuts 2 and 3 at the left end of the friction rod, so that the load-displacement curve of the damper will change from a triangular curve to a quadrilateral curve, where δ and Fare the total displacement and load of the damper respectively.

[0044] The following is a further calculation explanation of the load-displacement curve of the present invention applying pre-pressure: When the device is in the initial state, the load is less than the sum of the friction force of the device and the preload of the coil spring. Its deformation is provided by the elastic deformation of each component at this stage, and there is no relative movement between the components. When the device enters the working stage from the initial stage, when the load on the device exceeds the sum of the friction force of the device and the preload of the coil spring, relative movement begins between the wedge-shaped component and the friction rod. At this time, the axial displacement of the device can be recorded as (Device activation displacement), which is determined by the preload length of the coil spring, the friction force of the device, and the initial state stiffness of the damper, can be calculated and determined by the following formula.

[0045]

[0046]

[0047]

[0048] In the formula, , , They are the axial stiffness of the damper in the initial state, the stiffness of the inner and outer baffles, and the stiffness of the left and right pads. , , are the friction force, spring preload and damper activation load of the device, respectively.

[0049] The device will be activated when the load is greater than the damper activation load ( Figure 8 The reset system and variable friction energy dissipation system start to work, and the damper stiffness changes from the key parameters of the spring and wedge combination to the becomes .

[0050] Fig. 9 The total displacement of the present invention is δ The force analysis of the device, the compression of the spiral spring is δ , in the figure F is the tensile and compressive load on the device. is the coil spring force on the left retaining ring, is the pressure on the coil spring. The following equation can be established based on the equilibrium condition.

[0051]

[0052]

[0053] Fig.10 , Fig.11 , Fig.12 The total displacement of the present invention is δ The force analysis of the friction rod, inner wedge block and right retaining ring when , is the extrusion force between the inner wedge and the baffle, , is the extrusion force between the inner wedge block and the friction rod, , is the extrusion force between the outer wedge and the inner wedge; , is the friction force between the outer wedge and the inner wedge, , is the friction force between the friction rod and the inner wedge, , is the friction between the retaining ring and the inner wedge. In addition, it should be noted that , and , are static friction, , is the sliding friction force, and the following equation can be established based on the equilibrium condition.

[0054]

[0055]

[0056]

[0057]

[0058]

[0059]

[0060] The extrusion force between the inner wedge block and the friction rod is obtained by solving the equilibrium condition , as shown below.

[0061]

[0062]

[0063] Theoretical stiffness of the device during loading when it is in tension or compression and theoretical load F It can be calculated by the following formula.

[0064]

[0065]

[0066]

[0067] When the device starts uninstalling ( Figure 8 BC and FG segments in the unloading and loading modes are the same, but , The direction of the friction force is opposite to that during loading, and the other force directions remain unchanged. The displacement of the device is mainly provided by the elastic displacement of the inner baffle, the outer baffle and the friction rod before the spring does not rebound. and equal.

[0068] When the coil spring in the device rebounds ( Figure 8 The CD segment and GH segment in the figure), the damper unloading stiffness is , which is controlled by the key parameter value of the wedge component and the coil spring combination. Through the force analysis during unloading, it can be obtained that , Theoretical stiffness and theoretical load The value can be calculated as follows.

[0069]

[0070]

[0071]

[0072]

[0073] The following is combined with Figure 13-21 The performance of this embodiment is further described: Fig.13 The finite element model of a variable friction self-resetting energy-absorbing damper provided by the present invention is designed according to the actual requirements. The coil spring stiffness is 500N / mm, the preload length is 5mm, the angle of the wedge component is 45°, and the friction coefficient between the inner wedge block and the friction rod is 0.3. At the same time, the friction rod and the tension screw are made of 10.9 grade high-strength bolt material, and the other components are all made of Q345 steel.

[0074] Fig.14 and Fig.15 It is the equivalent stress diagram and plastic damage diagram of the finite element model of the present invention when the compression displacement is 30mm. The higher stress is mainly concentrated in the wedge-shaped component and the friction rod, and then the energy is dissipated through friction, and there is no plastic development. The components of the device are always in an elastic state, which is convenient for replacement after earthquake, so that the device can be quickly restored to its function.

[0075] Fig.16 and Fig.17 The equivalent stress diagram and plastic damage diagram of the finite element model of the present invention when the tensile displacement is 30 mm. The higher stress is mainly concentrated in the tension screw, but the wedge-shaped component and the friction rod still show higher stress, and then dissipate energy through friction. There is no plastic development, and all components of the device are always in an elastic state.

[0076] Fig.18 The hysteresis curves of the spiral spring stiffness coefficients of 500N / mm and 1000N / mm used in the present invention are compared. It can be seen from the figure that under the two parameters, the yield load of the device is 6.54kN and 13.08kN respectively; the ultimate load is 43.87kN and 87.60kN respectively; the restoring force is 10.84kN and 21.68kN respectively, and the post-yield stiffness is 1.25kN / mm and 2.50kN / mm respectively; the recovery stiffness is 0.32kN / mm and 0.69kN / mm respectively; the absolute energy dissipation capacity at maximum displacement is 1112.98J and 2211.92J respectively. The increase of the spiral spring stiffness coefficient from 500N / mm to 1000N / mm increases the characteristic parameters of the device by about 100%.

[0077] Fig.19 The hysteresis curves for the present invention with a preload length of 5mm and 8mm are compared. It can be seen from the figure that under the two parameters, the yield load of the device is 6.54kN and 12.31kN respectively; the ultimate load is 43.87kN and 51.64kN respectively; the restoring force is 10.84kN and 11.78kN respectively, and the post-yield stiffness is 1.25kN / mm and 1.25kN / mm respectively; the recovery stiffness is 0.32kN / mm and 0.35kN / mm respectively; the absolute energy dissipation capacity at maximum displacement is 1112.98J and 1256.89J respectively. The increase in the preload length from 5mm to 8mm increases the yield load of the device by 88.22%; the absolute energy dissipation capacity at the ultimate load and maximum displacement increases by about 15%; the restoring force, post-yield stiffness, and recovery stiffness are basically the same.

[0078] Fig. 20The hysteresis curves of the present invention with wedge-shaped component angles of 40° and 45° are compared. It can be seen from the figure that under the two parameters, the yield load of the device is 16.37kN and 6.54kN respectively; the ultimate load is 76.65kN and 43.87kN respectively; the restoring force is 10.64kN and 10.84kN respectively, and the post-yield stiffness is 2.03kN / mm and 1.25kN / mm respectively; the recovery stiffness is 0.31kN / mm and 0.32kN / mm respectively; the absolute energy dissipation capacity at maximum displacement is 2331.14J and 1112.98J respectively. The reduction of the wedge-shaped component angle from 45° to 40° increases the yield load of the device by 150.31%; the ultimate load increases by 74.72%; the post-yield stiffness increases by 62.40%; the absolute energy dissipation capacity at maximum displacement increases by 109.62%; the restoring force and the recovery stiffness are basically the same. During the simulation, it was found that it is not recommended to use a tan greater than 1.2 θ , because this will result in very weak energy dissipation capacity of the damper. The small surface angle of the wedge block will cause the characteristic load of the damper to be extremely large, resulting in plastic failure of the damper. Special attention should be paid in the design.

[0079] Fig.21 The hysteresis curves of the friction coefficients between the inner wedge block and the friction rod used in the present invention are compared to 0.6 and 0.3. It can be seen from the figure that under the two parameters, the yield load of the device is 6.54kN and 3.03kN respectively; the ultimate load is 43.87kN and 25.71kN respectively; the restoring force is 10.84kN and 12.79kN respectively, and the post-yield stiffness is 1.25kN / mm and 0.79kN / mm respectively; the recovery stiffness is 0.32kN / mm and 0.38kN / mm respectively; the absolute energy dissipation capacity at maximum displacement is 1112.98J and 404.21J respectively. The friction coefficient between the inner wedge block and the friction rod increases from 0.3 to 0.6, and the yield load of the device increases by 115.84%; the ultimate load increases by 70.63%; the post-yield stiffness increases by 58.23%; the absolute energy dissipation capacity at maximum displacement increases by 175.35%; the restoring force and the recovery stiffness are basically the same.

[0080] The above contents are only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A variable friction self-resetting energy dissipation damper, characterized in that: It includes a baffle, a self-resetting device and a friction energy dissipation device; The self-resetting device comprises a friction rod and an elastic device, both ends of the friction rod are respectively connected to the baffles, the elastic device is connected to the friction rod and is located between the two baffles, at least one end of the elastic device is provided with a friction energy dissipation device, the baffle is provided with a bolt for connecting to the building, one end of the bolt is fixedly connected to the baffle, and the other end passes through another baffle for connecting to the building node; The friction energy dissipation device includes a friction block and a locking block coaxially sleeved on the friction rod, the friction block and the locking block are located between the elastic device and the baffle, the friction block is provided with a plurality of shrinkage grooves at intervals along its circumferential direction, the outer annular surface of the friction block is an inclined surface, and the locking block is provided with a conical groove matching the inclined surface; when the elastic device is in a tension or compression state, the locking block can apply an annular clamping force to the friction block, causing the shrinkage groove to shrink, and friction energy is consumed between the friction block and the friction rod.

2. A variable friction self-resetting energy dissipation damper according to claim 1, characterized in that: An elastic force adjusting device is sleeved on the friction rod and is located between the elastic force device and the baffle plate, and is used to adjust the pressing force of the elastic force device.

3. A variable friction self-resetting energy dissipation damper according to claim 2, characterized in that: The elastic force adjustment device is sleeved on a retaining ring, a nut and a washer on the friction rod, the washer abuts against the baffle plate, the retaining ring abuts against the end of the elastic force device, and the nut is located between the retaining ring and the washer.

4. The variable friction self-resetting energy dissipation damper according to claim 1, characterized in that: The friction block comprises a plurality of inner wedge blocks, which are arranged on the end surface of the elastic device at intervals along the circumference of the axis of the friction rod.

5. A variable friction self-resetting energy dissipation damper according to claim 4, characterized in that: The inner wall of the inner wedge block is provided with friction lines, and the outer wall surface is a smooth inclined surface.

6. A variable friction self-resetting energy dissipation damper according to claim 1 or 5, characterized in that: The locking block is an outer wedge block, the center of which is provided with a circular hole and sleeved on the friction rod, and a conical groove is provided on one side of the outer wedge block close to the friction block, and the inclination of the groove matches the inclination of the inner wedge block.

7. The variable friction self-resetting energy dissipation damper according to claim 1, characterized in that: The two ends of the friction rod are connected to the baffle through nuts.

8. The variable friction self-resetting energy dissipation damper according to claim 1, characterized in that: One end of the bolt passes through the baffle and is connected to the building node through the node plate.

9. The variable friction self-resetting energy dissipation damper according to claim 8, characterized in that: A cushion block is arranged between the node plate and the baffle plate.

10. The variable friction self-resetting energy dissipation damper according to claim 1, characterized in that: The elastic device is a coil spring.

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