Fabricated high-toughness self-resetting viscoelastic damping device, calculation method and damping frame structure beam-column joint

Abstract

The invention discloses a fabricated high-toughness self-resetting viscoelastic damping device and a calculation method, and a damping frame structure beam-column node, the node damping device is arranged at a beam-column connection node, and comprises a transmission arm which is fixedly connected with a column body through a column side fixing seat; the rotary shearing energy consumption part comprises shearing main body steel plates which are fixedly connected with the beam body through a beam side fixing seat and rotary shearing plates which are coaxially arranged with the shearing main body steel plates, and one side, adjacent to the shearing main body steel plates, of each rotary shearing plate is connected with the corresponding shearing main body steel plate through a vulcanized viscoelastic material; the force transmission assembly is arranged between the transmission arm and the rotary shearing energy consumption part and used for converting angular displacement generated between beam columns into relative torsion between a shearing main body steel plate and a rotary shearing plate, and then the viscous-elastic material is sheared; one end of the elastic connecting piece is hinged to the beam side fixing base, and the other end of the elastic connecting piece is hinged to the transmission arm. The joint damping device achieves the effect of displacement amplification, and meanwhile has the shear energy consumption and self-resetting capacity.

Description

Technical Field

[0001] The present invention relates to the technical field of seismic reduction of building structures, and specifically to a prefabricated high-toughness self-centering viscoelastic seismic reduction device, a calculation method, and a beam-column joint of a seismic reduction frame structure. Background Technique

[0002] Building structure joints are important parts connecting different components, and their stability and reliability are crucial for the overall structure. Under seismic action, the forces on the frame structure joints are complex, and they are relatively vulnerable parts in the overall structure. Although the joints should meet the principle of "strong columns and weak beams" in design, it is often difficult to achieve this standard in actual projects. Under seismic action, a large horizontal shear force is generated in the core area of the joint, and the beam-column joint area absorbs energy by forming plastic hinges with its own damage. However, this situation is likely to cause shear brittle failure of the joint, leading to the collapse of the overall structure, and at the same time increasing the time and economic costs of post-earthquake repair work of the structure.

[0003] To solve the influence brought by the post-earthquake damage of the frame joints, domestic and foreign scholars have proposed that the seismic reduction device installed at the joints needs to have the ability of self-recovery. Through structural design, while the joint seismic reduction device plays the role of energy dissipation, the corresponding elastic connectors are used to restore the joint to its original position, reduce the residual deformation of the frame joints, ensure that the joints can still bear subsequent forces, and facilitate post-earthquake repair and replacement of components. At the same time, as the connection part of various building components, the allowable deformation of the joints is relatively small, which requires the seismic reduction device design at the joints to have response amplification technology to achieve sufficient energy dissipation under small displacements and be able to carry out seismic reduction and energy dissipation work under minor earthquakes and wind loads.

[0004] In addition, the existing calculation methods for the mechanical properties of viscoelastic materials are mostly used to deal with linear shear viscoelastic materials, and there are no suitable methods and means for the mechanical property calculation and mechanical property indexes of rotational shear viscoelastic materials, and the dynamic analysis and corresponding design of rotational shear viscoelastic materials cannot be carried out, making it difficult to design the parameters of rotational shear viscoelastic dampers suitable for joints.

[0005] To expand the development and application of rotational shear viscoelastic dampers and multi-dimensional energy-dissipating viscoelastic dampers, a series of equivalent rotational shear stiffness and rotational damping calculation methods are needed in actual engineering applications to guide the installation and regulation of various viscoelastic dampers. The equivalent rotational shear stiffness and rotational damping calculation methods need to calculate the corresponding device parameters, such as the thickness of viscoelastic materials, the area of viscoelastic materials, the device size, and the minimum number of devices required for the structure, by adding the known resisting moment of the structure. At the same time, in subsequent structural repair and post-earthquake repair work, this design method can also directly guide actual projects, accelerate the post-earthquake repair speed, and reduce the losses brought by seismic action.

[0006] In summary, designing an assembled high-toughness self-centering viscoelastic damping device and its equivalent rotational shear stiffness and rotational damping calculation method is of great significance for the frame joint structure. Summary of the Invention

[0007] In view of the above technical problems, the present invention proposes an assembled high-toughness self-centering viscoelastic damping device, a calculation method, and a beam-column joint of a damping frame structure. By designing the damper, it has the functions of being replaceable, energy dissipation, and self-centering, fully exerts the deformation ability of the joint, improves the seismic performance of the structure, reduces the residual deformation after an earthquake, and reduces the economic losses caused by earthquakes. And a design calculation method for the frame joint structure is established to obtain calculation results of the frame joint structure close to the actual situation, and the design of actual parameters is guided by calculating the corresponding mechanical property indexes.

[0008] In order to achieve the above technical objectives, the present invention adopts the following technical means:

[0009] An assembled high-toughness self-centering viscoelastic damping device is arranged at the beam-column connection joint and includes:

[0010] A transmission arm is fixedly connected to the column body through a column-side fixed seat;

[0011] A rotational shear energy dissipation part includes:

[0012] A shear main body steel plate is fixedly connected to the beam body through a beam-side fixed seat and coaxially arranged with the shear main body steel plate:

[0013] A rotational shear plate, one side of which adjacent to the shear main body steel plate is connected to the shear main body steel plate through a vulcanized viscoelastic material;

[0014] A force transmission component is arranged between the transmission arm and the rotational shear energy dissipation part to convert the angular displacement occurring between the beam and the column into the relative torsion between the shear main body steel plate and the rotational shear plate, and then shear the viscoelastic material to achieve the effect of energy dissipation, and includes:

[0015] A sector gear is fixed inside the transmission arm and located below the arc-shaped chute;

[0016] A cylindrical gear meshes with the sector gear. Both ends of the wheel shaft of the cylindrical gear extend out of the arc-shaped chute to extend the transmission shaft. A force transmission block is fixedly connected to the transmission shaft, and the force transmission block is installed in a card slot on the rotational shear plate;

[0017] An elastic self-centering member is arranged between the transmission arm and the beam-side fixed seat.

[0018] Beneficial effects: The device has good energy dissipation and self - resetting capabilities under seismic action. When the beam - column joint generates relative angular displacement under seismic action, relative movement occurs in the connecting parts on both sides of the device. Through the gear meshing of the transmission arm and the transmission shaft, the rotating shear plate undergoes displacement, and the visco - elastic material begins to dissipate energy, greatly enhancing the seismic energy - dissipation capacity and seismic toughness of the structural joint. At the same time, the position of the beam - side fixed seat fixed to the beam and column by the connecting piece changes relative to the transmission arm, causing the elastic connecting piece to deform and providing an elastic restoring force, enabling the device to self - reset after an earthquake. It can also exhibit good energy - dissipation effects under small earthquakes or wind loads and other conditions with small displacements. In this process, the device converts the small displacement of the original connecting part into the rotation arc of the transmission arm. Also, through the design where the movement arc lengths of the transmission arm and the transmission shaft are the same but the radii are different, and the equivalent radius of the latter is much smaller than that of the former, under the same rotation arc length, the rotation arc of the transmission shaft is amplified, achieving the purpose of sufficient shear energy dissipation under small - displacement conditions.

[0019] Secondly, most of the components of the device are connected in an assembled manner, and the pre - pressure, gear radius ratio, and the thickness of the cushion under the fixed seat can be replaced and adjusted before, during, and after use to adapt to the vast majority of building structures with complex working conditions.

[0020] In an alternative embodiment, a pre - tightening force connecting piece is provided on the outer side of the rotating shear plate, which is threadedly connected to the outer end of the transmission shaft to adjust the pre - pressure between the rotating shear plate and the shear main steel plate; the radius R1 of the cylindrical gear and the radius R2 of the sector gear satisfy the relationship: 3 < R2 / R1 < 10.

[0021] Beneficial effects: The selected radius relationship can fully exert the energy - dissipation capacity of the visco - elastic material within the limited layout space of the frame joint, achieving the characteristics of small occupied space and strong energy - dissipation capacity.

[0022] In an alternative embodiment, a first cushion is provided between the column - side fixed seat and the column body, and a second cushion is provided between the beam - side fixed seat and the beam body.

[0023] Beneficial effects: The device is provided with cushion blocks at both the beam end and the column end to adjust the positional relationship between the device and the two ends, which is convenient for installation under minor errors. The materials used for the cushion blocks are also beneficial for reducing local damage at the frame beam - column joints.

[0024] In an alternative embodiment, the elastic self - resetting member includes:

[0025] An elastic connecting piece, one end of which is hinged to the transmission arm through a self - resetting upper rod, and the other end is hinged to the beam - side fixed seat through a self - resetting lower rod. After connection, the elastic connecting piece is in an initial pre - tightened state.

[0026] Beneficial Effects: The ends of the elastic connector are anchored between the beam-side mounting bracket and the transmission arm, respectively, and are in an initial preloaded state. In this initial state, regardless of whether the force-transmitting portion rotates clockwise or counterclockwise, the elastic connector deforms, ensuring that the applied force is always greater than the initial preload. This ensures that after operation, the device will always return to its original position under the restorative force of the elastic connector.

[0027] In an optional embodiment, the elastic connecting member is any one of a disc spring, a high-strength spring, steel and a shape memory alloy.

[0028] Beneficial effects: The selectability of a variety of elastic connectors also allows the viscoelastic energy dissipation part of the device to be flexibly changed according to actual working conditions.

[0029] In an optional embodiment, wing-shaped steel plates with bolt holes extend from both side edges of the beam side fixing seat and both side edges of the column side fixing seat, and the beam side fixing seat and the column side fixing seat are assembled and connected to the node beam-column connection section through a number of screws, nuts and wing plate connectors.

[0030] The present invention further discloses a shock absorption method based on the assembled high-toughness self-resetting viscoelastic shock absorption device. When the beam-column node generates relative angular displacement due to earthquake action, the column drives the transmission arm to move relative to the beam body. The gear meshing between the transmission arm and the transmission shaft causes the rotating shear plate to displace, and the viscoelastic material begins to dissipate energy, thereby significantly improving the shock absorption and energy dissipation capacity and seismic toughness of the structural node.

[0031] In the event of small displacements due to minor earthquakes or wind loads, the device converts the tiny displacement into a rotational arc of the transmission arm. Furthermore, by designing the transmission arm and the transmission shaft to have the same arc length but different radii, the latter's equivalent radius is much smaller than the former. This allows the transmission shaft to rotate at a much larger arc length, achieving sufficient shear energy dissipation under small displacement conditions.

[0032] After the vibration ends, the elastic self-resetting member provides a restoring force, so that the force transmission part rotates in the opposite direction after the vibration to realize the self-resetting function of the shock absorber and improve the seismic toughness of the structure.

[0033] The present invention further discloses a method for calculating the equivalent rotational shear stiffness and rotational damping based on the assembled high-toughness self-resetting viscoelastic shock absorbing device, which is obtained by the following formula:

[0034]

[0035] Where K e is the equivalent rotational shear stiffness; C eis the equivalent rotational damping; a0 and M1 respectively represent the maximum angular displacement and the corresponding bending moment in the bending moment - angular displacement curve; M2 represents the bending moment corresponding to the angular displacement of 0 in the bending moment - angular displacement curve; ω is the loading frequency. Among them, the equation of the bending moment - angular displacement curve is as follows:

[0036]

[0037]

[0038] In the formula: α is the angle of rotational shear deformation of the viscoelastic material; α max is the maximum angle of rotational shear deformation of the viscoelastic material; η is the energy dissipation efficiency of the viscoelastic material; r is the distance from the spring connection to the rotation center of the assembled high - toughness self - reset viscoelastic shock absorber; θ is the initial angle between the rotating arm and the fixed seat on the beam side; β is the angle of the viscoelastic material. When the viscoelastic material is fan - shaped, β is the angle of the fan - shaped viscoelastic material; when the viscoelastic material is circular, β is 360 degrees; p is the term proposed by mathematical derivation; R1 is the inner radius of the viscoelastic material; R2 is the outer radius of the viscoelastic material; M v is the resistance moment of the entire viscoelastic material; K is the stiffness of the elastic self - reset component.

[0039] Beneficial effects: The proposed calculation method solves one by one the problems that it is difficult to determine the equivalent rotational shear stiffness and rotational damping of the rotational shear viscoelastic material and the quantitative calculation is complex, and provides an accurate calculation method for the design of dampers applicable to rotational shear energy dissipation. Secondly, the calculation method of the equivalent rotational shear stiffness and rotational damping of this device proposes the calculation formulas for the equivalent rotational shear stiffness K e and the equivalent rotational damping C e . With the mechanical properties related to this device, it can provide great help for actual engineering design. The calculation methods of each design parameter enable the required M v in the structure during the installation of the device to adjust the initial angle θ between the rotating tooth groove of the overall device and the fixed bottom plate, the inner radius R1 of the fan - shaped viscoelastic material, the outer radius R2 of the fan - shaped viscoelastic material, the stiffness K of the elastic self - reset component, etc., which is convenient for application in actual engineering design and greatly helps to promote the application and innovation of rotational shear viscoelastic dampers. The calculation method of the equivalent rotational shear stiffness and rotational damping of this device proposes the calculation formulas for the equivalent rotational shear stiffness K e and the equivalent rotational damping C e . With the mechanical properties related to this device, it can provide great help for actual engineering design.

[0040] The present invention further discloses a beam - column joint of a shock - absorbing frame structure, including a beam - column joint and a plurality of assembled high - toughness self - reset viscoelastic shock absorbers;

[0041] The beam-column node includes a beam body and a column body, and an assembled high-toughness self-resetting viscoelastic shock-absorbing device is respectively arranged between the beam body and the column body, and two adjacent assembled high-toughness self-resetting viscoelastic shock-absorbing devices are symmetrically arranged on both sides of the beam body and the column body, and wing-shaped steel plates with bolt holes are extended from the two side edges of the beam side fixing seat and the two side edges of the column side fixing seat of the adjacent two assembled high-toughness self-resetting viscoelastic shock-absorbing devices respectively, and the beam side fixing seats of the adjacent two assembled high-toughness self-resetting viscoelastic shock-absorbing devices are fixedly connected to the beam body by a number of screws, nuts and wing plate connectors; the column side fixing seats of the adjacent two assembled high-toughness self-resetting viscoelastic shock-absorbing devices are fixedly connected to the column body by a number of screws, nuts and wing plate connectors, so that multiple assembled high-toughness self-resetting viscoelastic shock-absorbing devices and the beam-column node form a closed self-resetting overall shock-absorbing system.

[0042] In an optional embodiment, the beam-column node of the shock-absorbing frame structure includes: an L-shaped node, a T-shaped node or a cross-shaped node.

[0043] In summary, the force transmission mechanism and shock absorption and energy dissipation mechanism of the device of the present invention are clear, and the installation process is simple and rapid. The beam-column nodes installed with the device have good energy dissipation capabilities under wind vibration, small earthquakes, and medium earthquakes through a unique amplification technology. This technology gives full play to the energy dissipation efficiency of the viscoelastic material, greatly improving the economy and applicability of the beam-column nodes installed with the device, and the structure performs well under wind vibration, small earthquakes, and medium earthquakes. Under the influence of a large earthquake, the viscoelastic energy-absorbing material fully dissipates energy through amplification technology to protect the structure installed with the device. The elastic self-resetting parts in the device have a good reset effect, so that the structure maintains normal use function, ensuring the speed, efficiency, and economy of post-earthquake repair work. It has played a strong guarantee for all aspects of the needs of the frame beam-column nodes. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 This is a structural diagram of the assembled high-toughness self-resetting viscoelastic shock absorbing device of the present invention arranged at a cross node;

[0045] Among them, 1-1 is the beam side fixing seat, 1-2 is the transmission arm; 2-1 is the shear main steel plate, 2-3 is the rotating shear plate, 2-4 is the preload connection piece; 4-1 is the screw; 4-2 is the nut; 4-3 is the rotating long screw; 4-4 is the rotating nut; 5 is the column; 6 is the beam body;

[0046] Figure 2 This is a structural diagram of the assembled high-toughness self-resetting viscoelastic shock absorbing device of the present invention being arranged at an L-shaped node;

[0047] Among them, 1-1-1 is an arc-shaped prism, and 4-5 is a wing plate connector;

[0048] Figure 3It is a schematic structural diagram of the assembled high-toughness self-centering viscoelastic damping device of the present invention arranged at a T-shaped joint;

[0049] Figure 4 It is a schematic structural diagram of the assembled high-toughness self-centering viscoelastic damping device of the present invention;

[0050] Among them, 4-6 are cushion bodies; 1-2-1 is a preset sliding groove of the transmission arm;

[0051] Figure 5 It is a unilateral explosion diagram of the assembled high-toughness self-centering viscoelastic damping device of the present invention;

[0052] Among them, 1-2-2 is a reserved hole of the transmission arm, 1-3 is a transmission shaft, and 1-3-1 is a force transmission block; 2-2 is a viscoelastic material; 3 is an elastic self-centering member;

[0053] Figure 6 It is a detailed drawing of the viscoelastic material of the assembled high-toughness self-centering viscoelastic damping device of the present invention;

[0054] Among them, R1 is the inner circle radius of the viscoelastic material, R2 is the outer circle radius of the viscoelastic material, and β is the included angle of the viscoelastic material;

[0055] Figure 7 It is a right view of the assembled high-toughness self-centering viscoelastic damping device of the present invention and a detailed drawing of the elastic self-centering member;

[0056] Among them, 3-1 is a self-centering upper rod, 3-2 is a self-centering lower rod, 3-3 is an elastic connecting member, and 3-4 is a pre-tightening member;

[0057] Figure 8 It is a sectional view of the viscoelastic energy dissipation part of the assembled high-toughness self-centering viscoelastic damping device of the present invention;

[0058] Figure 9 It is a detailed drawing of the wing plate connecting member of the assembled high-toughness self-centering viscoelastic damping device of the present invention;

[0059] Figure 10 It is a bending moment-angular displacement curve diagram obtained by ABAQUS numerical simulation of the calculation method of the assembled high-toughness self-centering viscoelastic damping device of the present invention under the same displacement amplitude;

[0060] Figure 11 It is a bending moment-angular displacement curve diagram obtained by ABAQUS numerical simulation of the calculation method of the assembled high-toughness self-centering viscoelastic damping device of the present invention under the same excitation frequency;

[0061] Figure 12 It is the K of the calculation method of the assembled high-toughness self-centering viscoelastic damping device of the present invention e 、C e Variation diagram with excitation frequency under different displacement amplitudes;

[0062] Figure 13 It is a comparison diagram of the numerical calculation method and the mathematical calculation method of the calculation method of the prefabricated high-toughness self-centering viscoelastic damping device of the present invention under different displacement amplitudes, excitation frequencies, and design parameters. Specific implementation manners

[0063] In order to make the technical problems, technical solutions, and beneficial effects solved by the present invention clearer, the following specific embodiments are used to further explain and illustrate the present invention. It should be understood that the specific embodiments described herein only explain the present invention and are not used to limit the present invention.

[0064] As Figure 1 shown, the prefabricated high-toughness self-centering viscoelastic damping device consists of four parts: a force transmission part, a viscoelastic energy dissipation part, an elastic self-centering member, and a connection part.

[0065] The force transmission part 1 is based on the beam-side fixed seat 1-1. The transmission arm 1-2 is connected to the beam-side fixed seat 1-1 along a preset chute. The cylindrical gear on the transmission shaft 1-3 passes through the preset chute and meshes with the sector gear on the transmission arm 1-2 for positioning after the viscoelastic energy dissipation part is installed.

[0066] The viscoelastic energy dissipation part 2 has the shear main body steel plate 2-1 as the main body, and the rest of the components are coaxially arranged with the shear main body steel plate 2-1. The viscoelastic material 2-2 and the rotating shear plate 2-3 are attached to both sides of the shear main body steel plate 2-1 in sequence. The two groups of shear main body steel plates 2-1, viscoelastic materials 2-2, and rotating shear plates 2-3 respectively penetrate the transmission shaft from both sides and are fixed by the pre-tightening force connecting piece 2-4, and a pre-tightening force is applied.

[0067] The number of viscoelastic layers, the thickness of the viscoelastic layer, and the number of shear surfaces can all be adjusted according to the actual engineering requirements, and it is required that the above three can cooperate with each other.

[0068] The elastic self-centering member 3 is connected to the reserved holes on the transmission arm 1-2 and the reserved holes on the beam-side fixed seat 1-1 at both ends of the elastic connecting piece 3-3 through pre-hinged ends adapted to it. The type, volume of the elastic connecting piece 3-3, and the matching connecting fasteners can be adjusted according to the actual working conditions.

[0069] The connection part 4 has wing-shaped steel plates with bolt holes protruding from both sides of the beam-side fixed seat 1-1 and both sides of the column-side fixed seat. According to the type of the installed node, the beam-side fixed seat 1-1 and the column-side fixed seat are assembled and connected to the node beam-column connection section through a number of screws, nuts, and wing plate connecting pieces.

[0070] The ratio of the radius of the cylindrical gear on the transmission shaft 1-3 to the equivalent radius of the sector gear in the slot hole of the transmission arm 1-2 can control the amplification effect. Different radius ratios result in different amplification effects, which need to be adjusted according to the actual engineering situation.

[0071] The second aspect of the present invention proposes a calculation method for an assembled high-toughness self-centering viscoelastic damping device, which is applied to the above beam-column joint. By means of differentiation, the existing viscoelastic shear mechanical property formula is converted into a mechanical property formula applicable to the amplified self-centering joint damping device, and the relationship between the moment resisted by the damper and the relative rotation angle is converted into the relationship between the horizontal force and the horizontal displacement. Comparing with the measured results, it can be seen that the moment-angle displacement curve obtained by the viscoelastic rotational shear theory calculation is the same as the measured moment-angle displacement curve, both of which are full ellipses. In addition, the corresponding mechanical properties can be calculated according to the horizontal force and horizontal displacement of the device, which can better represent the damping and energy dissipation capacity of the damper. The method includes the following steps:

[0072] According to the existing theoretical knowledge, the moment-angle displacement curve equation of the viscoelastic damper is:

[0073]

[0074] It can be known from formulas (1) and (2) that:

[0075]

[0076] Substituting formula (3) into formula (4) gives:

[0077]

[0078] The following definitions are made for the parameters to be used later: η is the energy dissipation efficiency of the viscoelastic material. In this embodiment, the shape of the viscoelastic material is a sector, β is the included angle of the sector viscoelastic material, R1 is the inner radius of the sector viscoelastic material, R2 is the outer radius of the sector viscoelastic material, R is the distance from the rotation center of the tiny viscoelastic unit, d θ is the included angle of the tiny viscoelastic unit, d L is the arc length of the tiny viscoelastic unit, d L = Rd θ 、d A is the tiny area of the viscoelastic material, and d A = d R d L 、α is the rotational shear deformation of the viscoelastic material.

[0079] Combining the above parameter definitions, the displacement u of the viscoelastic material and the tiny area d A of the viscoelastic material are as follows:

[0080] u = αR (6)

[0081] d A = d R d L = Rd θ d R (7)

[0082] Let the maximum rotation angle be α max , then the maximum shear displacement of the viscoelastic material is:

[0083] u max = α max R (8)

[0084] Substituting Equation (7) into Equation (2) gives:

[0085]

[0086] Substituting Equations (6), (7), and (8) into Equation (5) gives:

[0087]

[0088] Let

[0089] Then Equation (10) can be written as:

[0090] d F = aR 2 f(α)d θ d R (11)

[0091] Thus, the resistance moment d Mv of the viscoelastic material of the infinitesimal element is:

[0092] d Mv = Rd F = aR 3 f(α)d θ d R (12)

[0093] Then the resistance moment M v ' of the entire sector of the viscoelastic material is:

[0094]

[0095] Since the angle β of the sector of the viscoelastic material is a constant value and the integrand is independent of β, the resistance moment is:

[0096] Integrating gives:

[0097] Then:

[0098]

[0099] The integral gives:

[0100]

[0101] Let:

[0102] As Figure 4 shown, the meanings of the parameters are as follows with the simplified diagram of MSVJD as a schematic:

[0103] α —— the rotational shear deformation of the viscoelastic material;

[0104] R —— the preset chute radius of the transmission arm of the assembled high-toughness self-centering viscoelastic shock absorber;

[0105] r —— the distance from the spring connection point to the rotation center of the assembled high-toughness self-centering viscoelastic shock absorber;

[0106] θ —— the initial angle between the rotating arm and the beam-side fixed seat;

[0107] L —— the initial length of the spring, and

[0108] L′ —— the length of the spring after the assembled high-toughness self-centering viscoelastic shock absorber works, and

[0109] H —— the distance from the spring reset reaction force to the rotation center of the assembled high-toughness self-centering viscoelastic shock absorber, and

[0110] Combining the above parameter definitions, the spring resistance moment M″ v is as follows:

[0111]

[0112] Let:

[0113]

[0114] Then the resistance moment M v of the entire assembled high-toughness self-centering viscoelastic shock absorber is:

[0115]

[0116] Let:

[0117]

[0118] After simplification, we get:

[0119]

[0120] As can be seen from Equation (17), the rotational shear moment - angular displacement curve of the viscoelastic material of the prefabricated high - toughness self - resetting viscoelastic damping device is similar to the horizontal shear force - displacement curve, as Figure 4 shown. Through Equations (11) and (12), in the experiment, K e and C e can be calculated through the known loading frequency ω.

[0121]

[0122] In the formula, a max and M1 respectively represent the maximum angular displacement and the corresponding moment in the moment - angular displacement curve, and M2 represents the moment corresponding to the angular displacement of 0 in the moment - angular displacement curve.

[0123] Let L be the radius of the sector gear on the transmission arm, and the initial included angle between the beam - side fixed seat and the column - side fixed seat be θ, where θ = 90°. When the testing machine applies a vertical load F to the damper, F′ is the vertical load applied by the testing machine to the damper at any time, the vertical movement of the top of the transmission arm is a certain distance Δ, H is the distance between the rotation center and the rotation axis center of the loading point, and the transmission arm of the damper rotates a certain angle α relative to the original position. At this time, the included angle between the beam - side fixed seat and the column - side fixed seat will become θ - α. Therefore, the calculation formula for the moment of this damper relative to the rotation axis center is:

[0124]

[0125] H = L·Cosα (21)

[0126] M′ = F′·H (22)

[0127] In the prefabricated high - toughness self - resetting viscoelastic damping device, the gear transmission device plays a role in transmitting the moment. Therefore:

[0128] M′ = M v (23)

[0129] Substituting the above formula into Equation (17) gives:

[0130]

[0131] Next, the calculation method of the prefabricated high - toughness self - resetting viscoelastic damping device of the present invention will be described in detail.

[0132] (1) Determine the energy consumption and restoring force provided by the device according to the design conditions of the node. Among them, the energy consumption effect is related to the disc diameter, thickness, required number of layers of the viscoelastic material, and the ratio of the radius of the cylindrical gear in the transmission shaft to the equivalent radius of the sector gear in the transmission arm slot; the magnitude of the restoring force is related to the type of elastic connection member material, as well as the length, diameter, quantity, and pre-tightening force of the selected material.

[0133] (2) The assembled high-toughness self-centering viscoelastic damping device is installed at the node connection. Under seismic action, relative angular displacement occurs at this connection, and the device absorbs a large amount of energy and has the ability to self-center after an earthquake.

[0134] (3) When subjected to seismic action, relative angular displacement occurs between the beam-column connected by the device. Since the transmission arm is fixed to the node column through the connection part, the sector gear in the transmission arm slot also generates relative angular displacement, driving the transmission shaft to rotate, causing the rotating shear plate to rotate, and the rotating shear viscoelastic material dissipates energy. At the same time, the elastic connection member fixed to the transmission arm changes its position due to the relative angular displacement of the transmission arm, causing the elastic connection member to deform. After the seismic action ends, the device unloads, and due to the restoring force provided by the elastic connection member, the device self-centers.

[0135] Among them, the device transfers the relative angular displacement between the beam-column of the node to the transmission arm. Since the transmission arm and the transmission shaft move the same arc length but have different radii, the radian rotated by the transmission shaft is amplified to the radian of the rotating shear plate, fully shearing the viscoelastic material to dissipate energy.

[0136] To further demonstrate the calculation method of the moment-angular displacement curve of the amplified self-centering node damping device of the present invention, the following embodiments are listed and described in detail with the accompanying drawings as follows:

[0137] Please refer to Figures 1 to 8 , the technical solution adopted by the present invention to solve the technical problems existing in the known technology is: a method for calculating the mechanical parameters of a beam-column node of a frame structure, and the beam-column node of the frame structure includes: various types such as L-shaped nodes, T-shaped nodes, and cross-shaped nodes.

[0138] Establish a numerical model of the node installed with the assembled high-toughness self-centering viscoelastic damping device in the ABAQUS software. The corresponding units are used for the transmission shaft in the force transmission part of the device, the outer shell of the viscoelastic damping energy dissipation part, and the internal material of the viscoelastic damping energy dissipation part to conform to the simulation situation and avoid material shear locking.

[0139] In an ideal state, except for the normal working displacement, there is no relative displacement between the connecting components of the prefabricated high-toughness self-centering viscoelastic damping device node. For this constraint, the contact surfaces are connected by tying. Ignoring the influence of gear contact on the response amplification effect, the amplification effect of the device is controlled by the angular displacement ratio between the transmission shaft and the transmission arm.

[0140] Springs elements are used to connect the fixed seats on both sides of the beam and the lower ends of both sides of the transmission shaft respectively to simulate the influence of the elastic self-centering components on the structure. To improve the calculation efficiency, except for the energy-consuming materials involved, the rest are set as rigid body elements.

[0141] The establishment of the elastoplastic model and the calculation method can be as follows:

[0142] Step 1: In ABAQUS, three-dimensional deformable solid elements can be selected to draw the model of the prefabricated high-toughness self-centering viscoelastic damping device;

[0143] Step 2: In the ABAQUS property module, the material properties of the drawn model of the prefabricated high-toughness self-centering viscoelastic damping device can be edited;

[0144] Step 3: Based on the state when the prefabricated high-toughness self-centering viscoelastic damping device is assembled, in ABAQUS, the assembly of the model of the prefabricated high-toughness self-centering viscoelastic damping device and the creation of the viscous analysis step can be carried out;

[0145] Step 4: In the ABAQUS interaction module, interactions applied to the components of the prefabricated high-toughness self-centering viscoelastic damping device can be created to simulate the interactions between the components and the viscoelastic material. A connecting two-point spring acting between two points is used to simulate the elastic connecting component in the elastic self-centering component;

[0146] Step 5: In the ABAQUS boundary condition module, displacements / rotations at the model nodes can be created, including the relative angular displacement of the transmission arm in the force transmission part and the angular displacement of the transmission shaft driving the shear viscoelastic material;

[0147] Step 6: In the ABAQUS mesh module, the model mesh can be drawn, and different materials are divided using different elements to ensure the accuracy and simplicity of the model calculation;

[0148] Step 7: In the ABAQUS job module, a new job calculation process can be created and the finite element method can be used to solve the model.

[0149] The following further illustrates the calculation process of the present invention with a preferred embodiment of the present invention:

[0150] Suppose the relative angular displacement of an L-shaped joint of a certain building under seismic action is between 1° and 15°, the radius of the sector gear on the transmission arm is 450 mm, the radius of the cylindrical gear on the transmission shaft is 90 mm, and the magnification ratio λ = 5. The inner radius of the viscoelastic material is 65 mm, the outer radius is 265 mm, and the thickness of the viscoelastic material is 20 mm. Using the above elastic-plastic model establishment and calculation method, the force-displacement curve data at the specified frequency f = 2.0 Hz is calculated, and the bending moment-angular displacement curve satisfying Equation (17) is plotted for the conditions of the same loading frequency and different displacement amplitudes.

[0151] According to Equations (18) and (19), by knowing the key point values of the bending moment-angular displacement curve, the rotational shear dynamic mechanical property parameter K of the prefabricated high-toughness self-centering viscoelastic damping device can be calculated. e and C e , as shown in Table 1 below:

[0152] Table 1 Key points of the bending moment-angular displacement curve and dynamic mechanical property parameters

[0153]

[0154] According to Equations (20)-(24), the angular displacement and bending moment in the rotational shear viscoelastic material of the prefabricated high-toughness self-centering viscoelastic damping device can be converted into displacement and force in the linear shear viscoelastic material, which is convenient for subsequent calculation of dynamic mechanical properties.

[0155] The present invention further discloses a beam-column joint of a damping frame structure, including a beam-column joint and a plurality of prefabricated high-toughness self-centering viscoelastic damping devices;

[0156] The beam-column joint includes a beam body and a column body. A prefabricated high-toughness self-centering viscoelastic damping device is respectively arranged between the beam body and the column body. Two adjacent prefabricated high-toughness self-centering viscoelastic damping devices are symmetrically arranged on both sides of the beam body and the column body. And the two side edges of the beam-side fixing seat 1-1 and the two side edges of the column-side fixing seat of two adjacent prefabricated high-toughness self-centering viscoelastic damping devices respectively extend wing-shaped steel plates with bolt holes. The beam-side fixing seats 1-1 of two adjacent prefabricated high-toughness self-centering viscoelastic damping devices are fixedly connected to the beam body through a plurality of screws, nuts and wing plate connectors; the column-side fixing seats of two adjacent prefabricated high-toughness self-centering viscoelastic damping devices are fixedly connected to the column body through a plurality of screws, nuts and wing plate connectors, so that a plurality of prefabricated high-toughness self-centering viscoelastic damping devices and the beam-column joint form a closed self-centering overall damping system.

[0157] The beam-column joint of the damping frame structure includes: L-shaped joints, T-shaped joints and cross-shaped joints.

[0158] The above content is only to illustrate the technical idea of the present invention and cannot be used to limit the protection scope of the present invention. Any modification made on the basis of the technical solution in accordance with the technical idea proposed by the present invention falls within the protection scope of the claims of the present invention.

Claims

1. An assembled high-toughness self-centering viscoelastic damping device, characterized in that, Comprising: A transmission arm, fixedly connected to the column body through a column-side fixing seat; A rotary shear energy dissipation part (2), comprising: A shear main body steel plate (2-1), fixedly connected to the beam body through a beam-side fixing seat, and coaxially arranged with the shear main body steel plate (2-1): A rotary shear plate (2-3), one side of which adjacent to the shear main body steel plate (2-1) is connected to the shear main body steel plate (2-1) through a vulcanized viscoelastic material (2-2); A force transmission component, arranged between the transmission arm (1-2) and the rotary shear energy dissipation part (2), for converting the angular displacement occurring between the beam and column into the relative torsion between the shear main body steel plate (2-1) and the rotary shear plate, thereby shearing the viscoelastic material (2-2) to achieve the energy dissipation effect, comprising: A sector gear, fixed inside the transmission arm (1-2) and located below the arc-shaped chute; A cylindrical gear, meshing with the sector gear, both ends of the wheel shaft of the cylindrical gear extend out of the arc-shaped chute to extend a transmission shaft (1-3), and a force transmission block (1-3-1) is fixedly connected to the transmission shaft (1-3), and the force transmission block (1-3-1) is installed in a card slot on the rotary shear plate; An elastic self-resetting member (3) is arranged between the transmission arm (1-2) and the beam-side fixing seat (1-1).

2. The prefabricated high-toughness self-centering viscoelastic damping device according to claim 1, characterized in that, A pre-tightening force connecting member (2-4) is arranged outside the rotary shear plate, which is threadedly connected to the outer end of the transmission shaft to realize the adjustment of the pre-pressure between the rotary shear plate and the shear main body steel plate (2-1); the radius R1 of the cylindrical gear and the radius R2 of the sector gear satisfy the relationship: 3 < R2 / R1 < 10.

3. The prefabricated high-toughness self-centering viscoelastic damping device according to claim 1, wherein A first cushion body is arranged between the column-side fixing seat and the column body, and a second cushion body is arranged between the beam-side fixing seat and the beam body.

4. The prefabricated high-toughness self-centering viscoelastic damping device according to claim 1, wherein The elastic self-resetting member (3) comprises: An elastic connecting member (3-3), one end of which is hinged to the transmission arm (1-2) through a self-resetting upper rod (3-1), and the other end of which is hinged to the beam-side fixing seat (1-1) through a self-resetting lower rod (3-2); after connection, the elastic connecting member (3-3) is in an initial pre-tightening state.

5. The prefabricated high-toughness self-centering viscoelastic damping device according to claim 4, characterized in that, The elastic connecting member (3-3) is any one of a disc spring, a high-strength spring, steel, and a shape memory alloy.

6. The prefabricated high-toughness self-centering viscoelastic damping device according to claim 1, wherein, Wing-shaped steel plates with bolt holes extend from the two side edges of the beam-side fixing seat (1-1) and the two side edges of the column-side fixing seat respectively. The beam-side fixing seat (1-1) and the column-side fixing seat are respectively assembled and connected to the joint beam-column connection section through a plurality of screw rods, nuts, and wing plate connecting members.

7. The shock absorption method of the assembled high-toughness self-centering viscoelastic shock absorber according to any one of claims 1-6, characterized in that, When the beam-column joint generates a relative angular displacement under the action of an earthquake, at this time, the column body drives the transmission arm (1-2) to move relatively towards the beam body direction. The rotary shear plate is displaced through the gear meshing of the transmission arm and the transmission shaft, and the viscoelastic material starts to dissipate energy, greatly improving the shock absorption and energy dissipation capacity and seismic toughness of the structural joint; Under small earthquakes or wind loads and other conditions with small displacements, the device converts the small displacement into the rotation radian of the transmission arm. Through the design that the movement arc lengths of the transmission arm and the transmission shaft are the same but the radii are different, and the equivalent radius of the latter is much smaller than that of the former, under the same rotation arc length, the rotation radian of the transmission shaft is amplified, achieving the purpose of fully shearing and dissipating energy under small displacement conditions; After the vibration ends, the elastic self-resetting member provides a restoring force, enabling the force transmission part to rotate reversely after the earthquake to realize the self-resetting function of the shock absorber and enhancing the seismic toughness of the structure.

8. A calculation method for the equivalent rotational shear stiffness and rotational damping of the assembled high-toughness self-centering viscoelastic damping device according to claim 1, characterized in that, Obtained from the following formula: Where K e is the equivalent rotational shear stiffness; C e is the equivalent rotational damping; a0 and M1 represent the maximum angular displacement and the corresponding bending moment in the bending moment-angular displacement curve, respectively; M2 represents the bending moment corresponding to 0 angular displacement in the bending moment-angular displacement curve; ω is the loading frequency, where the bending moment-angular displacement curve equation is as follows: Where: α is the rotation shear deformation angle of the viscoelastic material; α max is the maximum rotation shear deformation angle of the viscoelastic material; η is the energy dissipation efficiency of the viscoelastic material; r is the distance from the spring connection to the rotation center of the assembled high-toughness self-centering viscoelastic damping device; θ is the initial angle between the rotating arm and the beam-side fixed seat; β is the angle of the viscoelastic material. When the viscoelastic material is fan-shaped, β is the angle of the fan-shaped viscoelastic material; when the viscoelastic material is circular, β is 360 degrees; p is the term proposed by mathematical derivation; R1 is the inner radius of the viscoelastic material; R2 is the outer radius of the viscoelastic material; M v is the resistance moment of the entire viscoelastic material; K is the stiffness of the elastic self-centering member.

9. A beam-column joint of a shock-absorbing frame structure, characterized in that, It includes beam-column joints and multiple assembled high-toughness self-resetting viscoelastic shock absorption devices as described in any one of claims 1 to 6; The beam-column joint includes a beam body and a column body. An assembled high-toughness self-resetting viscoelastic shock absorption device is respectively arranged between the beam body and the column body. Adjacent two assembled high-toughness self-resetting viscoelastic shock absorption devices are symmetrically arranged on both sides of the beam body and the column body. And the two side edges of the beam-side fixing seat (1-1) and the two side edges of the column-side fixing seat of adjacent two assembled high-toughness self-resetting viscoelastic shock absorption devices respectively extend wing-shaped steel plates with bolt holes. Between the beam-side fixing seats (1-1) of adjacent two assembled high-toughness self-resetting viscoelastic shock absorption devices, they are fixedly connected to the beam body through a plurality of screws, nuts and wing plate connectors; between the column-side fixing seats of adjacent two assembled high-toughness self-resetting viscoelastic shock absorption devices, they are fixedly connected to the column body through a plurality of screws, nuts and wing plate connectors, so that multiple assembled high-toughness self-resetting viscoelastic shock absorption devices and the beam-column joint form a closed self-resetting overall shock absorption system.

10. The beam-column joint of the shock-absorbing frame structure according to claim 9, characterized in that, The beam-column joint of the shock absorption frame structure includes: an L-shaped joint, a T-shaped joint or a cross-shaped joint.

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