An adaptive inertial friction self-resetting rocking wall

Abstract

The present invention discloses an adaptive inertial friction self - resetting rocking wall, which includes an inertial friction damping device, a connection conversion plate, a pin shaft, a steel rod, a conical cylinder, a rocking wall body, prestressed tendons, and an anchoring beam. The inertial friction damping device includes an end plate, a sleeve, a transmission shaft, a nut, a ball screw, a pre - compression spring, a cover plate, a fixing plate, a friction plate, a bearing, and high - strength bolts. Under seismic action, the rocking wall body swings, driving the connection conversion plate to generate a swinging displacement, and transmitting the displacement to the end plate through the pin shaft, so that the inertial friction damping device rotates with the hinges at both ends to become a two - force rod structure; the end plate drives the transmission shaft and the nut to generate tensile and compressive displacements, converts the tensile and compressive displacements into the rotational displacement of the ball screw through the balls, and drives the friction plate welded to the ball screw to rotate, thereby realizing the inertial energy absorption of the friction plate; the present invention has the advantages of strong energy - dissipation ability, adaptive swinging, excellent self - resetting performance, simple construction process, detachable and replaceable, etc.

Description

Technical Field

[0001] The present invention relates to a rocking wall with advantages such as inerter energy absorption, friction energy dissipation, adaptive rocking, and double self - resetting, belonging to the technical field of seismic reduction of engineering structures. Background Art

[0002] With the progress of society, the rapid post - earthquake recovery function of urban and engineering structures has become the focus of attention from all walks of life. The rocking wall structure is a new type of seismic - reduction structure with recoverable function. By releasing the bottom node constraint, it can generate rocking displacement under earthquake action. On the one hand, it can greatly reduce the damage of the wall itself, and on the other hand, it can absorb and dissipate the kinetic energy of the controlled structure. The energy - dissipation capacity and self - resetting ability of traditional rocking wall structures are poor. Therefore, damping devices and self - resetting structures are introduced into the rocking wall to form an energy - dissipation and resetting rocking wall structure system.

[0003] At the present stage, affected by the rocking motion form, the energy - dissipation and resetting rocking wall structure system generally has problems such as insufficient rocking amplitude, easy damage and failure of the connection between conventional damping energy - dissipation and resetting devices and the wall, which in turn lead to insufficient energy - dissipation capacity of the rocking wall structure system, difficulty in balancing the energy - dissipation capacity and resetting ability, and poor seismic - reduction robustness of the rocking wall structure system under strong earthquake action. How to improve the energy - dissipation capacity of the energy - dissipation and resetting rocking wall structure system, as well as the adaptability of damping devices and connectors to the rocking motion form, while ensuring its seismic - reduction robustness under strong earthquakes is the key point for the future development of the rocking wall structure system.

[0004] The inerter element can achieve inertial amplification and tuned energy absorption by changing the motion mode of components without changing the physical mass of the structure. However, due to the relatively small output force of the inerter element itself, it is difficult to obtain an optimal control effect when directly applying it to civil engineering structures. Therefore, scholars usually combine the inerter element with a damping device to significantly improve the energy - absorption and energy - dissipation ability of the damping device; combine the inerter element with a self - resetting device to achieve the self - resetting function of the inerter element.

[0005] In view of this, the present invention proposes an adaptive inerter - friction self - resetting rocking wall, which has the advantages of strong energy - dissipation ability, adaptive rocking, excellent self - resetting performance, simple construction technology, detachable and replaceable, etc. It can solve the disadvantages of poor energy - dissipation ability of the rocking wall, poor adaptability of connectors to the rocking motion form, and easy damage to the connection between the damping device and the wall, and has broad theoretical research significance and practical value. Summary of the Invention

[0006] To solve the problems of insufficient energy dissipation capacity of traditional rocking walls, poor adaptability of connectors to the rocking motion form, and easy damage to the connection between damping devices and walls, the present invention proposes an adaptive inertial friction self - resetting rocking wall. It can be used as infill walls between columns and floors of frame structures, infill walls of shear walls and masonry structures, and accessory rocking walls between bridge piers and cross - beams, etc. It can also be used in any available space in seismic strengthening structures.

[0007] To achieve the above - mentioned purpose, the present invention adopts the following technical solutions.

[0008] An adaptive inertial friction self - resetting rocking wall includes two parts: a rocking wall and an adaptive inertial friction. The rocking wall includes a conical cylinder 19, a rocking wall body 20, prestressed tendons 21, and an anchorage beam 22.

[0009] The adaptive inertial friction includes an inertial friction damping device 13, a first conversion connecting plate 14, a pin shaft 15, a second conversion connecting plate 16, a pin shaft 17, and a steel bar 18.

[0010] The rocking wall body 20 is centered with the anchorage beam 22 through the prestressed tendons 21 and the conical cylinder 19. Prestressed tendon holes are reserved on both the rocking wall body 20 and the anchorage beam 22. The prestressed tendons 21 pass through the reserved prestressed tendon holes of the rocking wall body 20 and the anchorage beam 22, and are tensioned and anchored, thus completing the installation of the rocking wall.

[0011] The adaptive inertial friction is installed at the corner of the rocking wall. The first conversion connecting plate 14 is a corner structure of the rocking wall body 20, and the second conversion connecting plate 16 is a structure on the anchorage beam 22 corresponding to the first conversion connecting plate 14. The inertial friction damping device 13 is vertically placed between the first conversion connecting plate 14 and the second conversion connecting plate 16.

[0012] Both ends of the inertial friction damping device 13 are respectively provided with a first end plate 1 and a second end plate 2. The second conversion connecting plate 16 is bolt - connected to the anchorage beam 22. The pin hole of the second end plate 2 at the bottom of the inertial friction damping device 13 is aligned with the pin hole of the second conversion connecting plate 16 and is connected through a second pin shaft 17. The pin hole of the first end plate 1 at the top of the inertial friction damping device 13 is aligned with the pin hole of the first conversion connecting plate 14 and is connected through a first pin shaft 15.

[0013] Furthermore, the inertial friction damping device 13 includes a first end plate 1, a second end plate 2, a sleeve 3, a transmission shaft 4, a nut 5, a ball screw 6, a preloading spring 7, a cover plate 8, a fixing plate 9, a friction plate 10, a bearing 11, and high-strength bolts 12. The transmission shaft 4 is arranged along the axial direction of the inertial friction damping device 13. Threaded holes are reserved on the transmission shaft 4 and the nut 5, and the transmission shaft 4 and the nut 5 are connected by bolts. The ball screw 6 is fixed in the transmission shaft 4 through the nut 5. The preloading spring 7 passes through the ball screw 6 and contacts the nut 5. The sleeve 3 passes through the ball screw 6, and the nut 5 and the preloading spring 7 are placed inside the sleeve 3. The cover plate 8 and the friction plate 10 pass through the ball screw 6 in sequence, and the friction plate 10 is welded to the outer surface of the ball screw 6. The fixing plate 9 passes through the ball screw 6, is bolted to the cover plate 8 through high-strength bolts 12, and a pre-tightening force is applied. One side of the bearing 11 is welded to the second end plate 2. The ball screw 6 penetrates into the bearing 11. The fixing plate 9 and the second end plate 2 are bolted together. The sleeve 3 is welded to one side of the cover plate 8, and the first end plate 1 is bolted to the transmission shaft 4.

[0014] Furthermore, under the action of an earthquake, the wall body 20 of the rocking wall sways, driving the first conversion connecting plate 14 to generate a sway displacement, and transmitting the displacement to the first end plate 1 through the pin shaft 15. As a result, the inertial friction damping device 13 rotates about its two ends as a "two-force member" structure. The first end plate 1 drives the transmission shaft 4 and the nut 5 to generate tensile and compressive displacements. The nut 5 converts the tensile and compressive displacements into the rotational displacement of the ball screw 6 through the balls, and then drives the friction plate 10 welded to the ball screw 6 to rotate, generating an inertial force, thereby realizing the inertial energy absorption of the friction plate 10. At the same time, the friction plate 10 and the cover plate 8 and the fixing plate 9 are in friction to achieve friction energy dissipation, and the reset function is realized through the prestressed tendons 21 and the preloading spring 7.

[0015] Furthermore, the wall thickness of the sleeve 3 is not less than 30 mm, and its length should ensure that the nut 5 is always inside the sleeve 3 when the transmission shaft 4 moves axially. The deformation ability (tensile and compressive in both directions) of the preloading spring 7 should ensure that its two ends are always in contact with the nut 5 and the cover plate 8. The diameters of the central holes of the cover plate 8 and the fixing plate 9 should not be less than the diameter of the ball screw 6. Their thicknesses can be designed according to the non-occurrence of local yielding under the action of the bolt pre-tightening force and should not be less than 10 mm. The ball screw 6 and the friction plate 10 are welded together, and the welding quality should meet the force transmission requirements.

[0016] Furthermore, the first conversion connecting plate 14 is a pre-embedded part, which is pre-embedded in the wall body 20 of the rocking wall through anchor bars. The diameter and strength of the anchor bars should meet the requirements of relevant specifications. The thickness of the second conversion connecting plate 16 is not less than 20 mm to ensure that the wall body 20 of the rocking wall does not slide. The diameter of the steel bar 18 should be smaller than the minimum inner diameter of the conical cylinder 19. The inclination angle of the generatrix of the conical cylinder 19 should be specifically determined according to the wall dimensions to ensure that the steel bar 18 can swing freely inside the conical cylinder 19.

[0017] Furthermore, the steel bar 18 can swing with the wall and rotate to a certain extent within the conical cylinder 19, acting as a shear key for the wall, while the second conversion connecting plate 16 contacts the bottom side of the wall body 20 of the rocking wall, also acting as a shear key. The shape of the wall body 20 of the rocking wall is "rectangular" with symmetric openings on both sides at the bottom corner, and the size of the opening is determined according to the size of the inertial friction damping device 13; the anchoring beam 22 should have an opening in the middle at the bottom to facilitate the tensioning and anchoring of the prestressed tendons.

[0018] Compared with the prior art, the advantages of the present invention are as follows: it has an inertial enhancement function, improving the energy absorption and dissipation capacity of the rocking wall; it has an adaptive rocking structure, improving the adaptability between the damping device and the rocking structure; and it significantly reduces the damage and failure of the connection between the damping device and the wall.

[0019] It has a dual self - reset mechanism, significantly improving the robustness of the rocking wall under strong earthquakes; the structure is simple, and most components are connected by bolts, which is convenient for installation and disassembly, and is easy to disassemble and repair after an earthquake. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of an adaptive inertial friction self - reset rocking wall.

[0021] Figure 2 It is a partially enlarged schematic diagram of the connection between the inertial friction damping device and the rocking wall and the shear key setting.

[0022] Figure 3 It is an axonometric view of the appearance of the inertial friction damping device.

[0023] Figure 4 It is a side view of the appearance of the inertial friction damping device.

[0024] Figure 5 It is an assembly drawing of the inertial friction damping device.

[0025] Figure 6 It is a schematic diagram of the connection between the first conversion connecting plate 14 and the first end plate 1.

[0026] Figure 7 It is a schematic diagram of the connection between the second conversion connecting plate 16 and the second end plate 2.

[0027] Figure 8 It is an axonometric view of the application of the adaptive inertial friction self - reset rocking wall - pier connection.

[0028] Figure 9 It is an axonometric view of the application of the adaptive inertial friction self - reset rocking wall - frame connection.

[0029] Figure 10 It is an axonometric view of the hoop of the frame beam - column joint. Detailed implementation manners

[0030] The following will describe in detail the specific implementation manners of the present invention with reference to the accompanying drawings.

[0031] Preferred Example 1:

[0032] As Figure 6 、 Figure 7 、 Figure 8 shown, this example provides an adaptive inertial friction self - resetting rocking wall between pier crossbeams, including an inertial friction damping device 13, a first conversion connecting plate 14, a pin shaft 15, a second conversion connecting plate 16, a pin shaft 17, a steel bar 18, a tapered cylinder 19, a rocking wall body 20, a prestressed tendon 21, an anchorage beam 22, a embedded part 23, and a pier cap 24.

[0033] As Figure 8 shown, the rocking wall body 20 is centered with the anchorage beam 22 through reserved prestressed ducts, steel bars 18 and tapered cylinders 19. The dimensions of the rocking wall body 20 are length × width × height = 1600 × 200 × 3200 mm, the opening dimensions of both side wall corners are length × width × height = 360 × 200 × 540 mm, the dimensions of the anchorage beam 22 are length × width × height = 2500 × 200 × 250 mm, the diameter of the steel bar 18 is 50 mm, the minimum diameter of the tapered cylinder 19 is 55 mm, the maximum diameter is 80 mm, and the wall thickness is 40 mm. The prestressed tendon 21 is inserted into the reserved ducts of the rocking wall body 20 and the anchorage beam 22, and the prestressed tendon is tensioned and anchored. Thus, the assembly of the wall part is completed.

[0034] As Figure 3 、 Figure 4 、 Figure 5 shown, the inertial friction damping device 13 includes a first end plate 1, a second end plate 2, a sleeve 3, a transmission shaft 4, a nut 5, a ball screw 6, a pre - compression spring 7, a cover plate 8, a fixing plate 9, a friction plate 10, a bearing 11, and a high - strength bolt 12.

[0035] As Figure 4As shown in the figure, a reserved threaded hole is provided on the transmission shaft 4 and the nut 5, and the transmission shaft 4 and the nut 5 are connected by bolts. The number of threaded holes is 6, the diameter of the threaded hole is 12 mm, the outer diameter of the transmission shaft 4 is 160 mm, the inner diameter is 130 mm, and the length is 270 mm. The ball screw 6 is inserted into the transmission shaft 4 through the nut 5, the preloading spring 7 is passed through the ball screw 6, and the preloading spring 7 is kept in contact with the nut 5. The sleeve 3 is passed through the ball screw 6, and the nut 5 and the preloading spring 7 are placed inside the sleeve 3. The outer diameter of the sleeve 3 is 260 mm, the inner diameter is 160 mm, and the length is 290 mm. The diameter of the ball screw 6 is 80 mm, the length is 260 mm, the outer diameter of the preloading spring 7 is 160 mm, the inner diameter is 90 mm, and the length is 90 mm. The elastic compression and tensile deformation exceed ±40 mm. The cover plate 8 is passed through the ball screw 6, the friction plate 10 is passed through the ball screw 6, and the friction plate 10 is welded to the outer surface of the ball screw 6. The fixing plate 9 is passed through the ball screw 6, bolted to the cover plate 8 by high-strength bolts 12, and a pre-tightening force is applied. The thicknesses of the cover plate 8, the fixing plate 9, and the friction plate 10 are all 30 mm, the diameter of the central opening is 80 mm, and the pre-tightening force of the high-strength bolts 12 is 20 kN. One side of the bearing 11 is welded to the second end plate 2, the ball screw 6 is inserted into the bearing 11, the fixing plate 9 is bolted to the second end plate 2, and the sleeve 3 is welded to one side of the cover plate 8. The inner diameter of the bearing 11 is 80 mm, the outer diameter is 120 mm, the cross-sectional shape of the second end plate 2 is square, the length is 350 mm, and the thickness is 40 mm. Finally, the first end plate 1 is bolted to the transmission shaft 4 to complete the assembly of the inertial friction damping device 13.

[0036] The assembled inertial friction damping device 13 is installed at the openings on both sides of the sway wall body 20, thus forming an adaptive inertial friction self-resetting sway wall. On this basis, the above-mentioned sway wall is hoisted as a whole to the pier cap, the anchoring beam 22 is anchored to the pier cap 24 through the reserved ground anchor bolts, and finally the embedded part 23 is connected to the lower tie beam of the bridge by high-strength bolts, and finally an adaptive inertial friction self-resetting sway wall for the pier tie beams is formed.

[0037] Preferred Example 2:

[0038] As Figure 6 、 Figure 7 、 Figure 9 、 Figure 10As shown, this example provides an adaptive inertia friction self-resetting swing wall for use outside a frame structure, which is used to improve the inter-layer stress of the frame structure and reduce the concentrated deformation between layers. It includes an inertia friction damping device 13, a first conversion connecting plate 14, a pin 15, a second conversion connecting plate 16, a pin 17, a steel rod 18, a cone 19, a swing wall body 20, prestressed tendons 21, an anchor beam 22, embedded parts 23, a pier cap 24, a beam-column node clamp 25, and a clamp ear plate 26. The assembly and installation of the inertia friction damping device 13 and the positioning and installation of the swing wall body 20 are the same as those in Example 1. The sizes and materials of the various components of the inertia friction damping device 13 can be selected according to energy consumption requirements while meeting the assembly requirements, and will not be repeated here.

[0039] like Figure 9 As shown, after the inertia capacity friction damping device 13 and the rocking wall body 20 are installed, they are hoisted as a whole to the foundation of the frame structure. The anchor beams 22 and the pier caps 24 are anchored with ground anchor bolts. The beam-column node clamps 25 are installed to the beam-column nodes of the required layer with high-strength bolts. Finally, the embedded parts 23 embedded in the rocking wall body 20 are connected to the clamp ear plates 26 with high-strength bolts, ultimately forming an adaptive inertia capacity friction self-resetting rocking wall for use outside the frame structure.

[0040] The foregoing description is merely a preferred embodiment of the present invention, and the implementation of the present invention is not limited thereto. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. An adaptive inertial friction self-resetting rocking wall, characterized in that It includes two parts: a rocking wall and an adaptive inertia friction. The rocking wall includes a conical barrel, a rocking wall body, prestressing tendons, and an anchoring beam. The adaptive inertia friction includes an inertia friction damping device, a first conversion connecting plate, a first pin shaft, a second conversion connecting plate, a second pin shaft, and a steel bar. The rocking wall body is centered with the anchoring beam through prestressing tendons and a conical barrel. Prestressing tendon holes are reserved on both the rocking wall body and the anchoring beam. The prestressing tendons are inserted into the reserved prestressing tendon holes of the rocking wall body and the anchoring beam, and then tensioned and anchored. Thus, the installation of the rocking wall is completed. The adaptive inertia friction is installed at the corner of the rocking wall. The first conversion connecting plate is a corner structure of the rocking wall body, and the second conversion connecting plate is a structure on the anchoring beam corresponding to the first conversion connecting plate. The inertia friction damping device is vertically placed between the first conversion connecting plate and the second conversion connecting plate. Both ends of the inertia friction damping device are respectively provided with a first end plate and a second end plate. The second conversion connecting plate is bolted to the anchoring beam. The pin holes of the second end plate at the bottom of the inertia friction damping device are aligned with the pin holes of the second conversion connecting plate and connected through the second pin shaft. The pin holes of the first end plate at the top of the inertia friction damping device are aligned with the pin holes of the first conversion connecting plate and connected through the first pin shaft. The inertia friction damping device includes a first end plate, a second end plate, a sleeve, a transmission shaft, a nut, a ball screw, a preloading spring, a cover plate, a fixing plate, a friction plate, a bearing, and high-strength bolts. The transmission shaft is arranged along the axial direction of the inertia friction damping device. Threaded holes are reserved on the transmission shaft and the nut, and the transmission shaft and the nut are connected by bolts. The ball screw is fixed in the transmission shaft through the nut. The preloading spring passes through the ball screw and contacts the nut. The sleeve passes through the ball screw, and the nut and the preloading spring are placed inside the sleeve. The cover plate and the friction plate pass through the ball screw in sequence, and the friction plate is welded to the outer surface of the ball screw. The fixing plate passes through the ball screw, is bolted to the cover plate through high-strength bolts, and a pre-tightening force is applied. One side of the bearing is welded to the end plate, the ball screw penetrates into the bearing, the fixing plate and the end plate are bolted together, the sleeve is welded to one side of the cover plate, and the first end plate is bolted to the transmission shaft. The first conversion connecting plate is a pre-embedded part and is pre-embedded in the rocking wall body through anchor bars. The steel bar rotates to a certain extent in the conical barrel as the wall rocks, playing the role of a shear key for the wall. The second conversion connecting plate contacts the bottom side of the rocking wall body and also plays the role of a shear key. The shape of the rocking wall body is a "rectangle" with symmetric openings on both sides of the bottom corner. The size of the opening is determined according to the size of the inertia friction damping device. The anchoring beam has an opening in the middle at the bottom to facilitate the tensioning and anchoring of the prestressing tendons.

2. An adaptive inertial friction self-resetting rocking wall according to claim 1, characterized in that, Under seismic action, the wall body of the rocking wall sways, driving the first connection conversion plate to generate a sway displacement, and transmitting the displacement to the end plate through the first pin shaft, so that the inerter friction damping device rotates with the hinges at both ends to become a "two-force bar" structure; the end plate drives the transmission shaft and the nut to generate tensile and compressive displacements, and the nut converts the tensile and compressive displacements into the rotational displacement of the ball screw through the balls, and then drives the friction plate welded to the ball screw to rotate, generating an inertial force to achieve energy absorption of the friction plate with inerter; the friction plate and the cover plate and the fixed plate are in friction to achieve friction energy dissipation, and the reset function is realized through the prestressed tendons and the pre-compressed springs.

3. An adaptive inertial friction self-resetting rocking wall according to claim 1, characterized in that The wall thickness of the sleeve is not less than 30 mm, and its length ensures that the nut is always inside the sleeve when the transmission shaft moves axially. The deformation ability of the pre-compressed spring ensures that its two ends are always in contact with the nut and the cover plate; the diameter of the central opening of the cover plate and the fixed plate is not less than the diameter of the ball screw, and their thicknesses are designed to not undergo local yielding under the action of the bolt pre-tightening force and are not less than 10 mm; the ball screw and the friction plate are welded and connected.

4. An adaptive inertial friction self-resetting rocking wall according to claim 1, characterized in that, The thickness of the first conversion connecting plate is not less than 20 mm to ensure that the wall body of the rocking wall does not slide; the diameter of the steel bar is smaller than the minimum inner diameter of the cone, and the inclination angle of the generatrix of the cone is specifically determined according to the wall size to ensure that the steel bar can swing freely in the cone.

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