Magnetic control self-resetting modular prefabricated beam column intelligent damping structure and using method thereof

Abstract

The invention discloses a magnetic control self-resetting modular prefabricated beam column intelligent damping structure and a use method thereof, belongs to the technical field of building energy dissipation and vibration reduction engineering, adopts a modular connection mode, and realizes quick assembly through connection of bolts and connecting pieces. The magneto-rheological fluid damper and the magneto-rheological damping elastomer jointly act to dynamically adjust the magnetic field intensity, the dynamic technology integration of regulating and controlling the rigidity of the magneto-rheological elastomer and the magneto-rheological damper is adopted, the response characteristic of the magnetic field and the buffering capacity of the elastomer are combined, and dual dynamic adjustment of damping and rigidity is achieved. Through cooperative work of dynamic damping adjustment of magnetorheological fluid and a self-resetting system, the shock resistance is remarkably improved.

Description

Technical Field

[0001] This invention belongs to the technical field of building energy dissipation and vibration reduction engineering, and particularly relates to a magnetically controlled self-resetting modular prefabricated beam-column intelligent damping structure and its application method. Background Technology

[0002] With the development of prefabricated buildings in the field of architecture and structural engineering, the performance of building materials and the seismic performance of prefabricated frame structures directly limit the promotion and use of prefabricated structures, and they still face many severe challenges.

[0003] Precast reinforced concrete structures represent a significant direction in my country's building structure development due to their standardized design, industrialized production, assembly-line construction, information management, and intelligent applications. However, the precast reinforced concrete structural system is not yet fully developed, and research on its overall stress and seismic performance is not sufficiently in-depth and systematic, which limits its widespread application, especially in high-intensity seismic zones. Traditional precast buildings exhibit poor seismic performance in high-intensity earthquake zones. In the seismic-resistant system of precast reinforced concrete frame structures, the beam-column joints, connection details, and seismic performance are the core components and key issues of the precast assembly structural system. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a magnetically controlled self-resetting modular prefabricated beam-column intelligent damping structure and its usage method to solve the problems mentioned in the background art or achieve better technical effects.

[0005] To solve the above-mentioned technical problems, the inventors, through practice and summarization, derived the technical solution of this invention. This invention discloses a magnetically controlled self-resetting modular precast beam-column intelligent damping structure, including a magnetorheological fluid damper, a quick-release end plate, a steel hinge structure, and an LVDT displacement sensor. The steel hinge structure and the magnetorheological fluid damper are both fixedly connected between adjacent modular precast beam-column nodes, with the magnetorheological fluid damper located at the upper and lower ends of the steel hinge structure. The LVDT displacement sensor is installed on the surface of the modular precast beam-column node and connected to a data transmission line to the controller, completing the wiring of the intelligent monitoring system.

[0006] Preferably, the LVDT displacement sensor is installed on the upper and lower surfaces of the core area of ​​the precast beam-column joint, and is perpendicular to the beam-column axis.

[0007] Preferably, the magnetorheological fluid damper includes a sliding interlock device, a magnetorheological elastomer, a surface acceleration sensor, and a magnetorheological fluid damper housing. The left and right ends of the sliding interlock device are respectively connected to the side end faces of the end plate. The sliding interlock device is equipped with a magnetorheological elastomer inside, and a surface acceleration sensor is installed at the top center of the magnetorheological elastomer. The magnetorheological fluid damper housing is fitted onto the outside of the sliding interlock device.

[0008] Preferably, the magnetorheological elastomer is filled with a magnetorheological fluid material and a shape memory alloy is arranged inside the magnetorheological elastomer.

[0009] Preferably, the magnetorheological fluid damper uses magnetorheological fluid as the damping medium, and achieves dynamic damping effect by intelligently controlling the magnetic field strength of the coil, and the damping force is continuously adjustable in the range of 0.1~100kN.

[0010] Preferably, the quick-release end plate is fixedly connected to the side end of the beam and column, and the magnetorheological fluid damper is embedded in the upper and lower ends of the steel hinge of the beam and column node at designated positions, and is fixedly connected to the quick-release end plate through the two end plates.

[0011] Preferably, the two end plates are fixedly connected to the quick-release end plates by high-strength bolts.

[0012] As a preferred embodiment, the method of using any of the above-described magnetically controlled self-resetting modular prefabricated beam-column intelligent damping structures comprises the following steps:

[0013] S1: Based on the characteristics of precast concrete sandwich panels, magnetorheological fluid damping energy dissipation and vibration reduction precast beam-column joints are adopted to control the damage of precast joints. After vibration damage, the precast joints can be restored to their function through modular replacement.

[0014] S2: In the prefabricated main components such as beams and columns, modular connection node areas are set up to achieve rapid assembly through specific connection methods. This is used for damping and self-resetting functional modules, which facilitates factory prefabrication and rapid on-site assembly.

[0015] S3: Magnetorheological fluid dampers are installed at the upper and lower positions of the beam-column joint area, and a steel hinge structure is installed in the middle part connected by a pin. The steel hinge can rotate around the pin. Replaceable quick-release end plates are used to connect to the beam-column joint at the upper and lower parts. Deformation energy is concentrated in the magnetorheological fluid dampers at the upper and lower parts. After the vibration damage, the magnetorheological fluid dampers can be quickly removed and replaced, so as to meet the requirement of restoring the function after the structure is damaged.

[0016] S4: A damping sliding interlock device is used inside the magnetorheological fluid damper. The surface is coated with magnetorheological elastomer, and the inner cavity is filled with magnetorheological fluid material. The damping is monitored by an acceleration sensor, and dynamic energy dissipation damping by compression and shear is adopted to reduce the vibration damage to the beam-column joint.

[0017] As a preferred option, a node structure with mechanical hinges and additional energy-dissipating magnetorheological fluid dampers is adopted, and the end plates at both ends of the magnetorheological fluid dampers are made of Q345 grade steel.

[0018] As a preferred option, the upper and lower energy-dissipating magnetorheological fluid dampers are filled with magnetorheological fluid material. The rheological properties of the magnetorheological fluid are controlled by a magnetic field to achieve real-time adjustment of the damping force. Under an external magnetic field, the magnetic particles form a chain structure, which significantly increases the fluid viscosity, thereby dissipating vibration energy.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] (1) The present invention adopts a modular connection method, and achieves rapid assembly by connecting bolts and connectors. The magnetorheological fluid damper and the magnetorheological damping elastomer work together to dynamically adjust the magnetic field strength. The dynamic technology of regulating the stiffness of the magnetorheological elastomer and the magnetorheological damper is integrated. By combining the magnetic field response characteristics and the buffering capacity of the elastomer, the dual dynamic adjustment of damping and stiffness is achieved.

[0021] (2) This invention significantly improves earthquake resistance by coordinating the dynamic damping adjustment of magnetorheological fluid with a self-resetting system. During an earthquake, the intelligent monitoring system monitors structural vibration and adjusts the damping force in real time, effectively consuming earthquake energy, suppressing structural displacement and acceleration, and reducing the degree of structural damage. After the earthquake, the shape memory alloy releases the stored energy through the liquid phase of the magnetorheological fluid material in the magnetorheological damping elastic body, allowing the structure to quickly return to its initial position, greatly reducing residual deformation, ensuring that the building maintains structural integrity and functionality after the earthquake, significantly reducing repair costs and time, and improving the post-disaster recoverability of the building.

[0022] (3) The application of this invention not only upgrades the traditional single passive energy dissipation and vibration reduction technology into a real-time dynamic active energy dissipation and vibration reduction device, but also significantly improves the structural seismic performance of prefabricated beam-column joints, enabling them to adapt to more complex seismic load environments. The core advantage of this innovative design lies in combining efficient construction with energy dissipation and vibration reduction performance, helping to achieve a win-win situation for both carbon reduction and ecological protection, while meeting the requirements of high speed and high standards in engineering construction. By using this new type of magnetorheological fluid-variable damping device, the performance of prefabricated concrete frame structures under high seismic intensity has been significantly improved, solving the problems in the application of traditional technologies. It has broad application value and can provide important reference for similar projects. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the internal structure of the magnetically controlled self-resetting modular prefabricated beam-column intelligent damping structure of the present invention.

[0024] Figure 2 This is a partial cross-sectional schematic diagram of the intelligent damping structure of the magnetically controlled self-resetting modular prefabricated beam-column structure of the present invention.

[0025] Figure 3 This is a schematic diagram of the overall structure of the magnetically controlled self-resetting modular prefabricated beam-column intelligent damping structure of the present invention;

[0026] Figure 4 This is a schematic diagram of the magnetorheological fluid damper structure in the magnetically controlled self-resetting modular prefabricated beam-column intelligent damping structure of the present invention.

[0027] Figure 5 This is a schematic diagram of the LVDT displacement sensor structure of the magnetically controlled self-resetting modular prefabricated beam-column intelligent damping structure of the present invention.

[0028] The attached figures are labeled as follows:

[0029] 1. End plate,

[0030] 2. Sliding interlock device,

[0031] 3. Magnetorheological elastic body,

[0032] 4. Surface acceleration sensor,

[0033] 5. Magnetorheological fluid damper housing,

[0034] 6. Magnetorheological fluid damper,

[0035] 7. Quick-release end plate,

[0036] 8. Steel hinge structure,

[0037] 9. LVDT displacement sensor. Detailed Implementation

[0038] To make the above-mentioned objectives, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to specific examples.

[0039] Example 1

[0040] Please see the appendix Figures 1-5 A magnetically controlled self-resetting modular precast beam-column intelligent damping structure includes a magnetorheological fluid damper 6, a quick-release end plate 7, a steel hinge structure 8, and an LVDT displacement sensor 9. The steel hinge structure 8 and the magnetorheological fluid damper 6 are both fixedly connected between adjacent modular precast beam-column nodes, with the magnetorheological fluid damper 6 located at the upper and lower ends of the steel hinge structure 8. The LVDT displacement sensor 9 is installed on the surface of the modular precast beam-column node and connected to the data transmission line to the controller to complete the wiring of the intelligent monitoring system.

[0041] Preferably, the LVDT displacement sensor 9 is installed on the upper and lower surfaces of the core area of ​​the precast beam-column joint, perpendicular to the beam-column axis, and can accurately capture the relative displacement of the joint under horizontal and vertical loads.

[0042] As a preferred option, stress and strain sensors are arranged on the upper and lower surfaces of the core area of ​​the precast beam-column joint. When the magnetorheological elastomer 3 is subjected to force and deforms, the resistance value of the resistance strain gauge will change accordingly. By measuring the change in resistance, the stress and strain condition of the damping elastomer can be accurately calculated.

[0043] Preferably, an acceleration sensor is installed on the surface of the magnetorheological fluid damper 6. By monitoring the acceleration data in real time through the acceleration sensor, the dynamic characteristics of the structural vibration frequency and amplification can be understood. This provides an important basis for the controller to adjust the damping force, so as to adjust the damping characteristics in a timely manner and effectively suppress the structural vibration.

[0044] The magnetorheological damper 6 includes a sliding interlock device 2, a magnetorheological elastomer 3, a surface acceleration sensor 4, and a magnetorheological damper housing 5. The left and right ends of the sliding interlock device 2 are respectively connected to the side end faces of the end plate 1. The magnetorheological elastomer 3 is installed inside the sliding interlock device 2. The surface acceleration sensor 4 is installed at the top center of the magnetorheological elastomer 3. The magnetorheological damper housing 5 is fitted onto the outside of the sliding interlock device 2.

[0045] Preferably, the sliding interlock device 2 has a mutually supporting structure inside to ensure that it has sufficient strength and stiffness when subjected to vertical loads, horizontal loads and bending moments.

[0046] Preferably, the magnetorheological elastomer 3 is filled with a magnetorheological fluid material and a shape memory alloy is arranged inside the magnetorheological elastomer 3. When the external conditions recover after the vibration, the shape memory alloy restores its original shape, causing the structure to reset. When the external conditions return to normal after the vibration, the shape memory alloy restores its original shape, causing the structure to reset.

[0047] The magnetorheological elastomer 3 and the sliding interlocking device 2 work together. When the sliding interlocking device is in sliding displacement, it can simultaneously be subjected to the dual effects of shear damping from both the upper and lower sides and the squeezing damping inside the interlocking slider. This fully utilizes the damping characteristics of the magnetorheological fluid to maximize energy dissipation. While reducing residual deformation of the structure, it also assists the magnetorheological fluid damper 6 to quickly return to its initial working state, improving the overall recoverability of the structure.

[0048] As a preferred option, the magnetorheological fluid damper 6 uses magnetorheological fluid as the damping medium. By intelligently controlling the magnetic field strength of the coil, it can achieve dynamic damping effect and continuously adjust the damping force within the range of 0.1~100kN. The magnetorheological elastomer contains an acceleration monitoring module, employing a neuron-like design, which can simultaneously monitor data and provide timely feedback on the seismic characteristics of the magnetorheological elastomer. The magnetorheological fluid damper 6 consists of an outer shell enclosing the internal device, with magnetic poles distributed around its perimeter. Both ends are connected by end plates, allowing for rapid connection to prefabricated beam-column joints using high-strength bolts, facilitating rapid replacement of damaged components.

[0049] The quick-release end plate 7 is fixedly connected to the side end of the beam and column. The magnetorheological damper 6 is embedded in the upper and lower ends of the steel hinge of the beam and column node at the designated positions and is fixedly connected to the quick-release end plate 7 through the two end plates 1.

[0050] Preferably, the two end plates 1 are fixedly connected to the quick-release end plates 7 by high-strength bolts.

[0051] The steel hinge structure is fixedly connected to end plates 1 on both sides, and the end plates 1 on both sides of the steel hinge structure are also fixedly connected to the quick-release end plates 7 by high-strength bolts.

[0052] Example 2

[0053] The method for using the above-mentioned magnetically controlled self-resetting modular prefabricated beam-column intelligent damping structure is as follows:

[0054] (1) Based on the characteristics of precast concrete sandwich panels, magnetorheological fluid damping energy dissipation and vibration reduction precast beam-column joints are used to control the damage of precast joints, and the precast joints can be restored by modular replacement after vibration damage.

[0055] (2) First, in the prefabricated main components such as beams and columns, modular connection node areas are set up to achieve rapid assembly through specific connection methods. This is used for damping and self-resetting functional modules, which facilitates factory prefabrication and rapid on-site assembly.

[0056] (3) Secondly, magnetorheological fluid dampers are installed at the upper and lower positions of the beam-column joint area, and a steel hinge structure is installed in the middle part and connected by a pin. The steel hinge can rotate around the pin. Replaceable quick-release end plates are used to connect the upper and lower parts to the beam-column joint. The deformation energy is concentrated in the magnetorheological fluid dampers at the upper and lower parts. After the vibration damage, the magnetorheological fluid dampers can be quickly replaced to meet the requirement of restoring the function after the structure is damaged.

[0057] (4) Finally, a damping sliding interlock device is adopted inside the magnetorheological fluid damper, the surface is attached with magnetorheological elastomer, the inner cavity is filled with magnetorheological fluid material, the monitoring is carried out by an acceleration sensor, and the dynamic energy dissipation damping method of extrusion and shear is adopted to reduce the vibration damage to the beam-column joint.

[0058] This invention employs a joint structure using mechanical hinges and additional energy-dissipating magnetorheological fluid dynamic dampers. The end plates of the magnetorheological fluid dampers are made of Q345 grade steel, and these end plates are connected to precast beams and columns using high-strength bolts to improve joint performance. Steel hinges are used at the joints of the precast beams and columns, with the end plates connected to the embedded end plates of the precast beams and columns via high-strength bolts. The steel hinges are connected by pins to transmit shear force and can rotate through these pins. The upper and lower energy-dissipating magnetorheological fluid dynamic dampers are modularly configured, and the main force-bearing structure within the cavity utilizes a damping sliding interlocking device to ensure high strength at the beam-column joint.

[0059] Preferably, the upper and lower energy-dissipating magnetorheological fluid dynamic dampers are filled with magnetorheological fluid material. The rheological properties of the magnetorheological fluid are controlled by a magnetic field, enabling real-time adjustment of the damping force. Under an applied magnetic field, the magnetic particles form a chain-like structure, significantly increasing the fluid viscosity and thus dissipating vibrational energy.

[0060] As a preferred embodiment, in the inner cavity of the upper and lower energy-consuming magnetorheological fluid dynamic damper, when vibration occurs, the damping sliding interlock device vibrates and slides in the inner cavity. The interlock device squeezes and shears the magnetorheological fluid material on the upper and lower sides. The arrangement of particles inside the magnetorheological fluid is controlled by magnetic control technology, thereby rapidly changing the damping characteristics of the material.

[0061] As a preferred option, a flexible magnetorheological damping elastomer is selected and distributed on the upper and lower surfaces of the damping sliding interlock device. The flexible magnetorheological damping elastomer contains an inner cavity filled with magnetorheological fluid material, and the damping effect is output through the solid and liquid phases of the magnetorheological fluid material.

[0062] Preferably, in the flexible magnetorheological damping elastomer, when the inner magnetorheological fluid material is in the liquid phase, the flexible magnetorheological damping elastomer and the magnetorheological fluid damper are both in a low-damping state to dissipate energy from minor earthquakes or wind loads. Simultaneously, when the magnetic field is removed and the fluid returns to its liquid phase state, the beam-column joint structure automatically springs back to its original position.

[0063] As a preferred embodiment, in the flexible magnetorheological damping elastomer, when a large moderate or severe earthquake occurs, the magnetorheological fluid material in the inner cavity of the flexible variable damping elastomer is in a solid state. The flexible magnetorheological damping elastomer and the magnetorheological fluid damper are both in a high-damping critical state, which is used to increase the stiffness or damping of the structure, consume the energy generated by the earthquake to the greatest extent, greatly reduce and suppress the dynamic response of the main structure, and improve the structure's ability to resist external vibrations.

[0064] As a preferred option, in the event of a large moderate or major earthquake, the magnetorheological damper is in a high-damping critical state. The displacement generated by the damping sliding interlock device produces internal compression magnetorheological fluid and a mixing mode of upper and lower end shear magnetorheological fluid, which suppresses and consumes seismic energy, thereby reducing the damage of vibration to the beam-column joint.

[0065] This invention discloses a magnetically controlled, self-resetting, modular prefabricated beam-column intelligent damping structure. Compared to the friction dampers and metal dampers commonly used in previous passive energy dissipation and vibration reduction technologies, the prefabricated assembled beam-column joints formed by combining these two technologies fully leverage the advantages of existing technologies while avoiding their limitations. By applying magnetorheological materials to the prefabricated assembled beam-column joints, the irreversible damage to traditional building structures after earthquakes and the high cost and long repair time of post-earthquake joints are avoided. This invention adopts a modular connection method, achieving rapid assembly through bolts and connectors. The magnetorheological fluid damper and the magnetorheological elastomer work together to dynamically adjust the magnetic field strength. It integrates dynamic technology to control the stiffness of the magnetorheological elastomer and the damping of the magnetorheological damper, combining the magnetic field response characteristics with the buffering capacity of the elastomer to achieve dual dynamic adjustment of damping and stiffness. It is suitable for fields with high seismic requirements such as high-rise buildings, bridges, and rail transit. In particular, it can significantly improve structural toughness and maintenance efficiency in modular prefabricated buildings, promote the engineering application of intelligent seismic technology, and has significant technological advancement and industrialization value, providing a more effective basis for the promotion and application of prefabricated modular prefabricated buildings.

Claims

1. A magnetically controlled self-resetting modular prefabricated beam-column intelligent damping structure, characterized in that, The system includes a magnetorheological fluid damper (6), a quick-release end plate (7), a steel hinge structure (8), and an LVDT displacement sensor (9). The steel hinge structure (8) and the magnetorheological fluid damper (6) are fixedly connected between adjacent modular precast beam-column nodes. The magnetorheological fluid damper (6) is located at the upper and lower ends of the steel hinge structure (8). The LVDT displacement sensor (9) is installed on the surface of the modular precast beam-column node and connected to the data transmission line to the controller to complete the wiring of the intelligent monitoring system.

2. The magnetically controlled self-resetting modular prefabricated beam-column intelligent damping structure according to claim 1, characterized in that, The LVDT displacement sensor (9) is installed on the upper and lower surfaces of the core area of ​​the precast beam-column node, and is perpendicular to the beam-column axis.

3. The magnetically controlled self-resetting modular prefabricated beam-column intelligent damping structure according to claim 1, characterized in that, The magnetorheological damper (6) includes a sliding interlock device (2), a magnetorheological elastomer (3), a surface acceleration sensor (4), and a magnetorheological damper housing (5). The left and right ends of the sliding interlock device (2) are respectively connected to the side end face of the end plate (1). The sliding interlock device (2) is equipped with a magnetorheological elastomer (3) inside. The surface acceleration sensor (4) is installed at the top center of the magnetorheological elastomer (3). The magnetorheological damper housing (5) is fitted on the outside of the sliding interlock device (2).

4. The magnetically controlled self-resetting modular prefabricated beam-column intelligent damping structure according to claim 1, characterized in that, The inner cavity of the magnetorheological elastomer (3) is filled with magnetorheological fluid material and a shape memory alloy is arranged inside the magnetorheological elastomer (3).

5. The magnetically controlled self-resetting modular prefabricated beam-column intelligent damping structure according to claim 3, characterized in that, The magnetorheological fluid damper (6) uses magnetorheological fluid as the damping medium. By intelligently controlling the magnetic field strength of the coil, it achieves dynamic damping effect and realizes that the damping force is continuously adjustable in the range of 0.1~100kN.

6. The magnetically controlled self-resetting modular prefabricated beam-column intelligent damping structure according to claim 1, characterized in that, The quick-release end plate (7) is fixedly connected to the side end of the beam and column. The magnetorheological damper (6) is embedded in the upper and lower ends of the steel hinge of the beam and column node at the designated position and is fixedly connected to the quick-release end plate (7) through the two end plates (1).

7. The magnetically controlled self-resetting modular prefabricated beam-column intelligent damping structure according to claim 6, characterized in that, The two end plates (1) are fixedly connected to the quick-release end plates (7) by high-strength bolts.

8. A method of using the magnetically controlled self-resetting modular prefabricated beam-column intelligent damping structure as described in any one of claims 1 to 7, characterized in that, The steps are as follows: S1: Based on the characteristics of precast concrete sandwich panels, magnetorheological fluid damping energy dissipation and vibration reduction precast beam-column joints are adopted to control the damage of precast joints. After vibration damage, the precast joints can be restored to their function through modular replacement. S2: In the prefabricated main components such as beams and columns, modular connection node areas are set up to achieve rapid assembly through specific connection methods. This is used for damping and self-resetting functional modules, which facilitates factory prefabrication and rapid on-site assembly. S3: Magnetorheological fluid dampers (6) are installed at the upper and lower positions of the beam-column joint area. A steel hinge structure is installed in the middle part and connected by a pin. The steel hinge can rotate around the pin. Replaceable quick-release end plates (7) are used at the upper and lower parts to connect with the beam-column joint. The deformation energy is concentrated in the magnetorheological fluid dampers (6) at the upper and lower parts. After the vibration damage, the magnetorheological fluid dampers (6) can be quickly replaced to meet the requirement of restoring the function after the structure is damaged. S4: The damping sliding interlock device (2) is used inside the magnetorheological fluid damper (6), the surface is attached with magnetorheological elastomer (3), the inner cavity is filled with magnetorheological fluid material, the monitoring is implemented by the acceleration sensor, and the dynamic energy dissipation damping method of extrusion and shear is adopted to reduce the vibration damage to the beam-column joint.

9. The method of use according to claim 8, characterized in that, The node structure adopts mechanical hinge and additional energy-consuming magnetorheological damper (6). The end plates (1) at both ends of the magnetorheological damper (6) are made of Q345 grade steel.

10. The method of use according to claim 8, characterized in that, The upper and lower energy-dissipating magnetorheological fluid dampers (6) are filled with magnetorheological fluid material. The rheological properties of the magnetorheological fluid are controlled by the magnetic field to achieve real-time adjustment of the damping force. Under the applied magnetic field, the magnetic particles form a chain structure, which significantly increases the fluid viscosity, thereby dissipating vibration energy.

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