Damaged replaceable seismic connection device and method with external friction energy dissipation plate

Abstract

The application discloses a damaged replaceable anti-seismic connecting device and method of an external friction energy dissipation plate, and relates to the technical field of civil engineering structure anti-seismic damping, which comprises a pre-buried anchoring assembly pre-buried in a concrete structure, the pre-buried anchoring assembly is connected with a large steel plate by penetrating through the concrete structure, the large steel plate is arranged on one side of the concrete structure, a bearing assembly is arranged between the large steel plate and the concrete structure, and the bearing assembly is penetrated by the pre-buried anchoring assembly; the end of the pre-buried anchoring assembly is fixed by a fastening assembly, and the fastening assembly is arranged on the outer side of the large steel plate. The application adopts the above-mentioned damaged replaceable anti-seismic connecting device and method of an external friction energy dissipation plate, all core friction energy dissipation components are externally arranged, and only the fastening assembly needs to be removed after an earthquake, so that the damaged large steel plate or friction gasket can be quickly and independently replaced, the main concrete structure does not need to be demolished, and the post-earthquake repair cost and construction difficulty are significantly reduced.

Description

Technical Field

[0001] This invention relates to the field of seismic resistance and vibration reduction technology in civil engineering structures, and in particular to a replaceable seismic-resistant connection device and method for damaged external friction energy dissipation plates. Background Technology

[0002] In traditional reinforced concrete frame structure design, the seismic design concept of "strong columns, weak beams; strong joints, weak members" is typically adopted. In the event of a rare earthquake, the structure primarily relies on plastic hinges formed at the beam ends to dissipate seismic energy, thereby preventing the building from collapsing entirely. However, this traditional seismic connection method has the following significant drawbacks: (1) Post-earthquake repair is extremely difficult and costly: After an earthquake, the concrete in the plastic hinge area at the beam end will be severely crushed and spalled, and the internal steel bars will yield or even break. This kind of deep damage is irreversible structural damage. Because the stress in this area is complex and it is cast as a whole with the main structure, it is difficult to carry out in-situ reinforcement or replacement after the earthquake. This often leads to the entire building being judged as a dangerous building and demolished, causing huge economic losses.

[0003] (2) Lack of post-earthquake functional recoverability (resilience): Traditional nodes must sacrifice the main structure itself while consuming energy. Under the development trend of modern earthquake-resistant "resilient cities", traditional nodes cannot meet the needs of quickly restoring the building's usability after an earthquake.

[0004] (3) Hidden damage is difficult to assess: Since the damage occurs inside the concrete, it is very difficult to assess the residual bearing capacity of the joint after the earthquake.

[0005] Therefore, there is an urgent need in this field for a new type of beam-column connection device that can concentrate earthquake damage on easily replaceable external components, protect the main concrete structure from damage, and achieve rapid repair and functional restoration after an earthquake. Summary of the Invention

[0006] The purpose of this invention is to provide a replaceable seismic-resistant connection device and method for damaged external friction energy dissipation plates, which solves the problems of difficult repair of the main structure after an earthquake, severe node damage, and lack of post-earthquake toughness in the prior art.

[0007] To achieve the above objectives, the present invention provides a replaceable seismic connection device for damaged external friction energy dissipation plates, including a pre-embedded anchoring component embedded in the concrete structure. The pre-embedded anchoring component extends through the concrete structure and connects to a large steel plate. The large steel plate is located on one side of the concrete structure. A receiving component is provided between the large steel plate and the concrete structure. The receiving component is passed through by the pre-embedded anchoring component. The end of the pre-embedded anchoring component is fixed by a fastening component, which is located on the outside of the large steel plate.

[0008] Preferably, the pre-embedded anchoring assembly includes a square anchoring pad, which is embedded inside the concrete structure. The square anchoring pad is perpendicularly connected to one end of a pre-embedded long bolt, and the other end of the pre-embedded long bolt passes through the concrete structure and is connected to the large steel plate.

[0009] Preferably, the receiving component includes a steel base and a friction pad sleeved on the other end of the pre-embedded long bolt, the friction pad being disposed between the large steel plate and the steel base, and the steel base being disposed on the outer surface of the concrete structure.

[0010] Preferably, the fastening assembly includes a disc spring and a high-strength nut disposed at the end of the pre-embedded long bolt. The high-strength nut compresses the disc spring, so that the disc spring is in a semi-compressed state and provides a preload force to the contact surface.

[0011] Preferably, the large steel plate has a through hole and a long hole for connecting with the pre-embedded long bolt.

[0012] Preferably, the width of the short axis of the elongated hole is greater than the diameter of the pre-embedded long bolt.

[0013] Preferably, the length of the major axis of the elongated hole is determined according to a preset anti-seismic sliding displacement.

[0014] A method for a damaged replaceable seismic-resistant connection device for an external friction energy dissipation plate includes the following steps: S1. When the building structure encounters seismic dynamic load, relative displacement occurs between the structural floors. When the shear force generated by this displacement exceeds the maximum static friction force applied to the large steel plate by the high-strength nut and disc spring, the large steel plate begins to slide relative to the pre-embedded long bolts along its own long holes. S2. During the sliding process, intense friction occurs between the large steel plate and the friction pad, which converts the destructive seismic energy into heat energy and dissipates it. S3. During the post-earthquake repair phase, since the large steel plates, friction pads and fastening components are all completely exposed on the concrete structure surface, the inspection personnel can visually assess the damage to the components. If damaged parts need to be replaced, use a wrench to remove the outermost high-strength nut and disc spring, pull out the large steel plate and friction pad and replace them with brand new parts, without having to dismantle the concrete structure or embed anchor components.

[0015] Therefore, the present invention, employing the above-mentioned replaceable shock-resistant connection device and method for damaged external friction energy dissipation plates, has the following beneficial effects: This device externalizes all core friction energy-dissipating components such as large steel plates and bearing components. After an earthquake, only the fastening components need to be removed to quickly and independently replace the damaged large steel plates or friction pads without dismantling the main concrete structure, which significantly reduces the cost and difficulty of post-earthquake repair.

[0016] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0017] Figure 1 This is a structural schematic diagram of a damaged and replaceable shock-resistant connection device for an external friction energy dissipation plate according to the present invention. Figure 2 This is an exploded structural diagram of a damaged replaceable shock-resistant connection device for an external friction energy dissipation plate according to the present invention. Attached reference numerals: 11, square anchor plate; 12, pre-embedded long bolt; 20, steel base; 30, friction pad; 40, large steel plate; 50, disc spring; 60, high-strength nut. Detailed Implementation

[0018] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0020] Example Please see Figures 1-2This invention provides a replaceable seismic-resistant connection device for a damaged external friction energy-dissipating plate, enabling concentrated dissipation of seismic energy and rapid in-situ replacement after an earthquake. It includes a pre-embedded anchoring component embedded within a concrete structure, which extends through the concrete structure and connects to a large steel plate 40. The large steel plate 40 is positioned on one side of the concrete structure, and a receiving component is provided between the large steel plate 40 and the concrete structure, through which the pre-embedded anchoring component passes. The end of the pre-embedded anchoring component is fixed by a fastening component located on the outside of the large steel plate 40, used to press the large steel plate 40 inward, allowing the large steel plate 40 to overcome friction and slide along the elongated hole under seismic action to dissipate seismic energy.

[0021] The pre-embedded anchoring assembly provides foundation support and includes a square anchor plate 11 embedded deep within the concrete structure (e.g., 150 mm deep) to provide pull-out anchoring force, ensuring that the pre-embedded long bolt 12 will not be pulled out of the concrete structure under extreme seismic loads. The square anchor plate 11 is perpendicularly connected to one end of the pre-embedded long bolt 12, and the other end of the pre-embedded long bolt 12 passes through the concrete structure and connects to the large steel plate 40.

[0022] The receiving component includes a steel base 20 and a friction pad 30, which are sleeved on the other end of the pre-embedded long bolt 12. The friction pad 30 is disposed between the large steel plate 40 and the steel base 20 and is made of a material with a yield strength lower than that of high-strength steel plate (such as brass or polymer friction material). It serves as an independent friction-reducing and energy-dissipating interface to provide a stable coefficient of friction and prevent seizing and jamming between the large steel plate 40 and the steel base 20. In this embodiment, the friction pad 30 is made of brass. The steel base 20 is disposed on the outer surface of the concrete structure.

[0023] The fastening assembly is used to press the large steel plate 40 inward, enabling the large steel plate 40 to overcome friction and slide along the elongated hole under seismic action to dissipate seismic energy. The fastening assembly includes a disc spring 50 and a high-strength nut 60 disposed at the end of the pre-embedded long bolt 12. The disc spring 50 is used to automatically compensate for and maintain a constant preload pressure between the contact surfaces when the friction pad 30 experiences microscopic wear due to reciprocating friction during seismic events.

[0024] During on-site construction and installation, a torque-controlled wrench is used to apply a preset torque to the high-strength nut 60, causing the nut 60 to compress the disc spring 50. This puts the disc spring 50 in a semi-compressed state, providing a stable and adjustable preload. By using a torque-controlled wrench in conjunction with the semi-compressed disc spring 50, not only can a precise and constant normal preload be provided to the large steel plate 40, but also, when the device experiences slight wear after long-term service or repeated earthquake sliding, the elastic rebound capability of the disc spring 50 can automatically compensate for thickness loss, maintaining the pressure on the friction surface without attenuation.

[0025] The large steel plate has through holes and elongated holes for connecting with the pre-embedded long bolts 12. The minor axis width of the elongated hole is greater than the diameter of the pre-embedded long bolt 12. If the pre-embedded long bolt 12 is of M16 specification, the minor axis width of the elongated hole can be set to 18mm. The engineering clearance reserved in the direction of the minor axis of the elongated hole reduces the construction difficulty of on-site component assembly and allows for a certain installation error; on the other hand, it ensures that the large steel plate 40 will not have a lateral rigid collision with the pre-embedded long bolt 12 and cause the bolt to shear off when it slides along the major axis of the elongated hole for seismic resistance. The major axis length of the elongated hole is determined according to the preset seismic resistance sliding displacement.

[0026] The large steel plate 40, friction pad 30, and fastening components are all located outside the concrete structure. In the event of damage after an earthquake, the damaged large steel plate 40 or friction pad 30 can be independently disassembled and replaced by removing the high-strength nut 60.

[0027] The method of using the above-mentioned replaceable seismic connection device for damaged external friction energy dissipation plates includes the following steps: S1. When the building structure encounters dynamic loads such as earthquakes, relative displacement occurs between the structural layers. When the shear force generated by this displacement exceeds the maximum static friction force applied to the large steel plate 40 by the high-strength nut 60 and the disc spring 50, the large steel plate 40 begins to slide relative to the pre-embedded long bolt 12 along its own elongated hole.

[0028] S2. During the sliding process, intense friction occurs between the large steel plate 40 and the friction pad 30, converting the destructive seismic energy into heat energy and dissipating it (i.e., frictional energy dissipation). In this process, the brass pad acts as an independent friction-reducing interface, utilizing the relatively stable coefficient of friction between brass and steel to effectively prevent the "seizing" or jamming phenomenon that may occur between the large steel plate 40 and the steel base 20, ensuring the fullness and stability of the energy dissipation hysteresis curve.

[0029] S3. During the post-earthquake repair phase, since the large steel plate 40, friction pads 30, and fastening components are all completely exposed on the concrete structure surface, inspectors can visually assess the damage to the components. If damaged parts need to be replaced, a wrench is used to remove the outermost high-strength nut 60 and disc spring 50, and the large steel plate 40 and friction pads 30 are extracted and replaced with brand-new parts. This eliminates the need to demolish the concrete structure or pre-embed anchoring components, greatly reducing post-earthquake repair costs and shortening the repair cycle, thus achieving rapid structural recovery.

[0030] Therefore, the present invention adopts the above-mentioned replacement seismic connection device and method for damaged external friction energy dissipation plate, which places all core friction energy dissipation components externally. After an earthquake, only the fastening components need to be removed to quickly and independently replace the damaged large steel plate or friction pad, without having to demolish the main concrete structure, which significantly reduces the cost of post-earthquake repair and construction difficulty.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A replaceable seismic-resistant connection device for damaged external friction energy dissipation plates, characterized in that: The invention includes a pre-embedded anchoring component embedded inside a concrete structure. The pre-embedded anchoring component extends through the concrete structure and connects to a large steel plate. The large steel plate is located on one side of the concrete structure. A receiving component is provided between the large steel plate and the concrete structure. The receiving component is passed through by the pre-embedded anchoring component. The end of the pre-embedded anchoring component is fixed by a fastening component, which is located on the outside of the large steel plate.

2. The replaceable shock-resistant connection device for damaged external friction energy dissipation plates according to claim 1, characterized in that: The pre-embedded anchoring assembly includes a square anchoring plate, which is embedded inside the concrete structure. The square anchoring plate is perpendicularly connected to one end of a pre-embedded long bolt, and the other end of the pre-embedded long bolt passes through the concrete structure and is connected to the large steel plate.

3. The replaceable shock-resistant connection device for damaged external friction energy dissipation plates according to claim 2, characterized in that: The receiving component includes a steel base and a friction pad sleeved on the other end of the pre-embedded long bolt. The friction pad is disposed between the large steel plate and the steel base, and the steel base is disposed on the outer surface of the concrete structure.

4. The replaceable shock-resistant connection device for damaged external friction energy dissipation plates according to claim 3, characterized in that: The fastening assembly includes a disc spring and a high-strength nut disposed at the end of the pre-embedded long bolt. The high-strength nut compresses the disc spring, causing the disc spring to be in a semi-compressed state and provide pre-tightening force to the contact surface.

5. The replaceable shock-resistant connection device for damaged external friction energy dissipation plates according to claim 4, characterized in that: The large steel plate has through holes and elongated holes for connecting with the pre-embedded long bolts.

6. The replaceable shock-resistant connection device for damaged external friction energy dissipation plates according to claim 5, characterized in that: The width of the short axis of the elongated hole is greater than the diameter of the pre-embedded long bolt.

7. The replaceable shock-resistant connection device for damaged external friction energy dissipation plates according to claim 6, characterized in that: The length of the major axis of the elongated hole is determined according to the preset anti-seismic sliding displacement.

8. A method for using a replaceable seismic-resistant connection device for a damaged external friction energy dissipation plate as described in any one of claims 1-7, characterized in that, Includes the following steps: S1. When the building structure encounters seismic dynamic load, relative displacement occurs between the structural floors. When the shear force generated by this displacement exceeds the maximum static friction force applied to the large steel plate by the high-strength nut and disc spring, the large steel plate begins to slide relative to the pre-embedded long bolts along its own long holes. S2. During the sliding process, intense friction occurs between the large steel plate and the friction pad, which converts the destructive seismic energy into heat energy and dissipates it. S3. During the post-earthquake repair phase, since the large steel plates, friction pads and fastening components are all completely exposed on the concrete structure surface, the inspection personnel can visually assess the damage to the components. If damaged parts need to be replaced, use a wrench to remove the outermost high-strength nut and disc spring, pull out the large steel plate and friction pad and replace them with brand new parts, without having to dismantle the concrete structure or embed anchor components.

Images