Anti-seismic composite damper based on self-healing-metal buckling-eddy current coupling

Abstract

The utility model discloses an anti-seismic composite damper based on self-healing-metal buckling-eddy current coupling. The anti-seismic composite damper comprises a connecting rod assembly, a damping wall assembly and a rotating support. The connecting rod assembly comprises a rigid connecting section, a slidable inserting section and a permanent magnet, and the rigid connecting section and the slidable inserting section form buckling guide fit through a preset path; the damping wall assembly is of a multi-layer composite structure and comprises a shell, a cooling layer and a magnetic conductive layer, and an inner cavity of the damping wall assembly wraps the connecting rod assembly to form a magnetic flux loop. The rotating support is provided with a rotating limiting structure, and the two ends of the rotating limiting structure are connected with the connecting rod assembly and an external structure correspondingly. According to the utility model, the elliptical cavity is preset in the plastic base body, and the elliptical cavity is broken to release the self-healing agent when the displacement of the connecting rod exceeds a threshold value; after the self-healing agent flows out, the self-healing agent chemically reacts with the plastic matrix to be cured into a solid, and displacement is hindered through mechanical occlusion; the phase change resistance generated in the curing process achieves self-adaptive adjustment of small-earthquake low resistance and large-earthquake high resistance, and the damping force can be remarkably enhanced during strong earthquakes and aftershocks.

Description

Technical Field

[0001] This utility model belongs to the field of bridge seismic protection technology, specifically a seismic composite damper based on self-healing-metal buckling-eddy current coupling. Background Technology

[0002] In the field of bridge seismic technology, dampers are the core components for energy dissipation and vibration reduction. Currently, mainstream technologies are mainly divided into displacement-dependent dampers, velocity-dependent dampers, and other special dampers, each with specific application scenarios and technical limitations.

[0003] Displacement-dependent dampers absorb energy through friction or metal plastic deformation. They are simple in construction, cost-controllable, and particularly suitable for stable energy dissipation under large displacement conditions.

[0004] Velocity-dependent dampers, represented by viscous dampers, convert kinetic energy into thermal energy through the viscous shearing action of fluids such as silicone oil. Their advantage lies in not changing the structural stiffness characteristics, making them particularly suitable for renovation projects that need to maintain the original dynamic characteristics of the structure.

[0005] Among special dampers, tuned mass dampers (TMDs) counteract the vibration of the main structure by adding an anti-phase motion of a mass block, and perform outstandingly in wind vibration control of super high-rise buildings; eddy current dampers utilize the principle of electromagnetic induction to achieve non-contact energy dissipation, solving the wear problem of traditional mechanical parts, and have technical advantages in long-life requirements.

[0006] Although bridge seismic resistance technology has formed a relatively complete system, the following problems still exist in practice:

[0007] In the existing technology system, most types of dampers adopt a single energy dissipation mechanism, lack the ability to work in multiple stages, and are unable to cope with the complex excitation characteristics of multi-frequency and multi-energy levels of seismic motion.

[0008] More notably, traditional dampers often suffer irreversible functional degradation after strong earthquakes due to plastic deformation or component damage, lacking self-repair capabilities and severely impacting the structure's secondary protection performance under aftershocks. Furthermore, existing composite dampers mostly employ simple mechanical combinations, failing to achieve sequential activation and synergistic effect of different energy-consuming components, resulting in a low overall energy efficiency ratio. Utility Model Content

[0009] The main purpose of this invention is to provide a seismic composite damper based on self-healing-metal buckling-eddy current coupling, which has good protective performance against strong earthquakes and aftershocks.

[0010] The seismic composite damper based on self-healing-metal buckling-eddy current coupling provided by this utility model includes a connecting rod assembly, a damping wall assembly, and a rotating support. The connecting rod assembly includes a rigid connecting section, a slidable insertion section, and a permanent magnet. The rigid connecting section and the slidable insertion section form a buckling-guided fit through a preset path. The damping wall assembly is a multi-layer composite structure, including a shell, a cooling layer, and a magnetic conductive layer. Its inner cavity encloses the connecting rod assembly and forms a magnetic flux loop. The rotating support is provided with a rotation limiting structure, and its two ends are respectively connected to the connecting rod assembly and the external structure.

[0011] In one embodiment of the above-mentioned damper, the connecting rod assembly includes a steel column, a soft steel column, a hollow steel column, a plastic ring, and a permanent magnet; the steel column and the soft steel column are coaxially welded to form a rigid connecting section, the hollow steel column has a curved cavity inside and forms an insertion fit with the soft steel column, and the permanent magnet is fixedly connected to the hollow steel column through the plastic ring.

[0012] In one embodiment of the above-mentioned damper, the plastic ring is made of fiber-reinforced material and has multiple cavities filled with self-healing agent embedded inside. The cavities are elliptical and evenly distributed along the circumference of the ring.

[0013] In one embodiment of the above-mentioned damper, the damping wall assembly comprises, from the outside to the inside, a steel outer shell layer whose ends are sealed and fixed to a steel column, a coolant layer filled with a heat-conducting medium, and a copper conductive layer that maintains a gap fit with the permanent magnet.

[0014] In one embodiment of the above-mentioned damper, the copper conductive layer and the permanent magnet form a closed magnetic circuit, generating an eddy current damping effect during relative motion.

[0015] In one embodiment of the above-mentioned damper, the heat-conducting medium is an ethylene glycol-based coolant.

[0016] In one embodiment of the aforementioned damper, the rotating support includes a ball head and a square box; the ball head is welded to the end of a steel column, and the square box has a narrowed opening and is fixed to the bridge surface through a limiting seat, forming a ball hinge structure that allows rotation.

[0017] In one embodiment of the above-mentioned damper, the square box is made of high-strength cast steel, and its side is detachably connected to the limiting seat by high-strength bolts.

[0018] The beneficial effects of this utility model are as follows:

[0019] 1. An elliptical cavity is pre-placed in the plastic matrix. When the displacement of the connecting rod exceeds the threshold, it breaks and releases a self-healing agent. After the self-healing agent flows out, it reacts chemically with the plastic matrix and solidifies into a solid. It hinders displacement through mechanical interlocking. The phase change resistance generated during the solidification process achieves adaptive adjustment of "low resistance in small earthquakes and high resistance in large earthquakes". Compared with the traditional fixed damping mode, it can significantly enhance the damping force during strong earthquakes and aftershocks.

[0020] 2. A composite system is formed by integrating three mechanisms: fiber-reinforced self-healing damping, curved hollow buckling energy dissipation, and eddy current damping. The elastic deformation of fiber-reinforced plastic and eddy current damping provide initial energy dissipation; the self-healing agent solidifies after being released by compression, generating additional resistance; when the steel column buckles along the preset curved path, the coolant circulation maintains the stable operation of the eddy current components; compared with a single-mechanism damper, this device has a higher overall energy dissipation efficiency under earthquakes. Attached Figure Description

[0021] Figure 1 This is a top cross-sectional view of one embodiment of the present invention.

[0022] Figure 2 for Figure 1 A schematic diagram of the isometric structure. Detailed Implementation

[0023] The relevant technical solutions will now be clearly and completely described with reference to the accompanying drawings of the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments, and not all of the embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this utility model.

[0024] like Figure 1 As shown, the seismic composite damper based on self-healing-metal buckling-eddy current coupling disclosed in this embodiment includes a connecting rod assembly 1, a damping wall assembly 2, and a rotating support 3.

[0025] The connecting rod assembly 1 includes a steel column 11, a soft steel column 12, a hollow steel column 13, a plastic ring 14, and a permanent magnet 15.

[0026] Steel column 11 and soft steel column 12 are coaxially welded to form a rigid connection section, constituting an integral structure that cannot move relative to each other; when their axes coincide, the diameter of the soft steel column is smaller than that of the steel column.

[0027] The permanent magnet 15 is ring-shaped, with a uniformly thick rubber layer covering both its left and right end faces. The plastic ring 14 is fixed to the left end face of the permanent magnet, and its outer edge is mechanically locked to the permanent magnet.

[0028] The plastic ring 14 is made of fiber-reinforced plastic and has multiple elliptical cavities embedded inside. The cavities are elliptical and evenly distributed along the circumference of the ring, and are filled with a self-healing agent.

[0029] The left end of the hollow steel column 13 is fixed to the right end of the permanent magnet 15, and there is no relative movement between the two. The hollow steel column has a pre-set curved hollow cavity inside.

[0030] The right end of the soft steel column 12 passes through the center of the plastic ring 14 and the permanent magnet 15, and is inserted into the pre-set curved hollow cavity inside the hollow steel column 13, forming a sliding mating fit between the two. The curved hollow cavity inside the hollow steel column provides guiding space for the buckling deformation of the soft steel column.

[0031] The damping wall assembly 2 is a multi-layered composite cylindrical structure that encloses the various structures of the connecting rod assembly 1 within its inner cavity. From the outside in, the damping wall assembly includes a steel layer, a coolant layer, and a copper layer.

[0032] The steel layer is the outermost shell, made of high-strength alloy steel, and its surface is hot-dip galvanized. Its left end is fixedly connected to and sealed with the steel column 11. Its right end is connected to the hollow steel column 13 through a rubber sealing ring, which forms a sliding fit with the hollow steel column, allowing the hollow steel column to move relative to the hollow steel column during axial displacement.

[0033] The coolant layer is filled with ethylene glycol-based coolant, which has high specific heat capacity and good thermal conductivity.

[0034] The copper layer is made of copper in a barrel shape, and its inner diameter is fitted with the outer diameter of the permanent magnet 11 with a clearance; the copper layer is fixed to the steel layer by bolts.

[0035] When the device shakes under the action of an earthquake, the magnetic flux passing through the copper layer will change. According to Lenz's law, an induced current, namely eddy current, will be generated in the copper layer. The eddy current will interact with the magnetic field and generate resistance to the shaking of the device. At the same time, the eddy current will generate heat when it flows in the copper layer, and this heat will be carried away by the coolant layer.

[0036] like Figure 2 As shown, the rotating support 3 includes a ball head 31 and a square box 32.

[0037] Two ball heads 31 are welded to the ends of the two steel columns 13 respectively; the square box 32 is a rectangle made of high-strength cast steel, with a narrowed opening on one side; the two ball heads are respectively placed in the square box to form a mechanical limit. The side of the square box is fixed to the bridge surface by high-strength bolts and limit seats.

[0038] Rotary bearings allow the ball head to rotate in three dimensions, breaking the problem that ordinary connections can only move in two dimensions; at the same time, they can prevent the ball from coming off, ensuring the continuity of the force transmission path under the action of multi-directional components of an earthquake.

[0039] The cooperative working process of this damper is as follows:

[0040] 1. Minor earthquake phase:

[0041] The soft steel column slides within the curved hollow cavity and undergoes guided buckling deformation, extending the energy absorption path; simultaneously, the fiber-reinforced plastic undergoes elastic deformation, which, together with the eddy current damping, dissipates energy.

[0042] 2. Strong earthquake phase:

[0043] When the displacement of the soft steel column exceeds the threshold, the elliptical cavity inside the plastic ring is squeezed and ruptured. The released self-healing agent reacts chemically with the plastic matrix and solidifies into a solid. Through mechanical interlocking, it increases the resistance of the relative sliding at both ends of the damper during an earthquake, thereby improving the energy dissipation capacity.

[0044] 3. Aftershock phase:

[0045] The cured self-healing agent forms a phase change resistance layer, which, together with the continuously operating eddy current damping, provides secondary protection. The coolant circulation system maintains a stable temperature in the copper tank, ensuring the continued effectiveness of the eddy current effect.

[0046] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although detailed descriptions have been provided with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A seismic composite damper based on self-healing-metal buckling-eddy current coupling, characterized in that: It includes a connecting rod assembly, a damping wall assembly, and a rotating support; The connecting rod assembly includes a rigid connecting section, a slidable insert section, and a permanent magnet. The rigid connecting section and the slidable insert section form a buckling-guided engagement through a preset path. The damping wall assembly is a multi-layered composite structure, including an outer shell, a cooling layer, and a magnetic conductive layer. Its inner cavity encloses the connecting rod assembly and forms a magnetic flux loop. The rotating support is equipped with a rotation limiting structure, whose two ends are connected to the connecting rod assembly and the external structure, respectively.

2. The seismic composite damper based on self-healing-metal buckling-eddy current coupling as described in claim 1, characterized in that: The connecting rod assembly includes a steel column, a soft steel column, a hollow steel column, a plastic ring, and a permanent magnet; The steel column and the soft steel column are coaxially welded to form a rigid connection section. The hollow steel column has a curved cavity inside and forms an interlocking fit with the soft steel column. The permanent magnet is fixedly connected to the hollow steel column through a plastic ring.

3. The seismic composite damper based on self-healing-metal buckling-eddy current coupling as described in claim 2, characterized in that: The plastic ring is made of fiber-reinforced material and has multiple cavities filled with self-healing agent embedded inside. The cavities are elliptical and evenly distributed along the circumference of the ring.

4. The seismic composite damper based on self-healing-metal buckling-eddy current coupling as described in claim 1, characterized in that: The damping wall assembly comprises, from the outside to the inside, a steel outer shell layer whose ends are sealed and fixed to the steel column, a coolant layer filled with a heat-conducting medium, and a copper conductive layer that maintains a gap fit with the permanent magnet.

5. The seismic composite damper based on self-healing-metal buckling-eddy current coupling as described in claim 4, characterized in that: The copper conductive layer and the permanent magnet form a closed magnetic circuit, generating an eddy current damping effect during relative motion.

6. The seismic composite damper based on self-healing-metal buckling-eddy current coupling as described in claim 4, characterized in that: The heat-conducting medium is an ethylene glycol-based coolant.

7. The seismic composite damper based on self-healing-metal buckling-eddy current coupling as described in claim 1, characterized in that: The rotating support includes a ball head and a square box; the ball head is welded to the end of the steel column, and the square box has a narrowed opening and is fixed to the bridge surface through a limiting seat, forming a ball hinge structure that allows rotation.

8. The seismic composite damper based on self-healing-metal buckling-eddy current coupling as described in claim 7, characterized in that: The square box is made of high-strength cast steel, and its sides are detachably connected to the limiting seat by high-strength bolts.

Images