Self-resetting assembled concrete column-column box connection structure with multi-modal energy dissipation

Abstract

The present invention relates to a self-resetting assembled concrete multi-modal energy-absorbing lower column-column box-type connection structure, comprising: a precast reinforced concrete lower column, a precast reinforced concrete upper column, a plurality of lower steel boxes, a plurality of upper connecting members, and a plurality of energy-absorbing plate assemblies, wherein the plurality of lower steel boxes are correspondingly arranged at the corners of the upper end of the precast reinforced concrete lower column; the plurality of upper connecting members are correspondingly arranged at the corners of the lower end of the precast reinforced concrete upper column; the lower steel boxes and the upper connecting members are correspondingly fixedly connected to achieve the connection between the precast reinforced concrete lower column and the precast reinforced concrete upper column; the plurality of energy-absorbing plate assemblies are respectively located between two adjacent lower steel boxes, the lower portion of the energy-absorbing plate assembly being fixedly connected to the precast reinforced concrete lower column, and the upper portion being fixedly connected to the precast reinforced concrete upper column. The present invention can achieve friction energy dissipation in a small displacement mode and buckling energy dissipation in a large displacement mode, overcoming the problems of the single energy dissipation form and insufficient energy dissipation of existing structures, and improving the seismic performance of the structure.

Description

Technical Field

[0001] The present invention belongs to the technical field of prefabricated concrete buildings, and in particular relates to a self-resetting prefabricated concrete multi-modal energy-dissipating column-to-column box connection structure. Background Art

[0002] Prefabricated buildings, with their advantages of high energy efficiency, full life cycle, and effective reduction of carbon emissions, have become an important tool for promoting the transformation, upgrading, and high-quality development of the construction industry. The prefabricated connection technology for horizontal components such as beams and slabs has been continuously improved. How to achieve higher assembly rate requirements for the main structure? The key to prefabricated concrete frame structures is how to achieve prefabricated connections of vertical components (columns). Column-to-column connections are often vulnerable points to damage, and the column-to-column connection surface is a weak surface with significantly reduced bearing capacity. Therefore, the safety and applicability of column-to-column connections are the focus of our attention.

[0003] The current column-column connection methods include grouting sleeve connection, welding connection and bolt connection. As far as the current status quo is concerned, the grouting sleeve connection cannot guarantee the density of the grouting in terms of technology; although the welding connection is convenient to construct, the construction quality cannot be guaranteed. The main reason is that it relies too much on the technical level of the construction workers; the force of the bolt connection is relatively complex. When the precision of ordinary connecting bolts is low, they are not suitable for shearing. When the precision is high, the processing and installation are difficult. The friction surface treatment and installation process of high-strength bolt connection is relatively complicated, the cost is high, and it is easy to loosen under the action of earthquakes, which is easy to produce weak points in the column-column connection area, and cannot effectively solve the adverse effects brought by earthquake resistance and wind resistance; the column-column connection of prefabricated buildings is generally weak and easy to damage. The existing column-column connection method is not reliable enough and cannot effectively utilize the combined structure of grouting and steel bar connection. In addition, the above connection methods generally delay the structure from entering the plastic working stage and reduce plastic deformation by increasing the bearing capacity. The energy consumption capacity is often poor and does not meet the performance design goals of structural seismic resistance. Summary of the Invention

[0004] In order to solve the above problems existing in the prior art, the present invention provides a self-resetting assembled concrete multi-modal energy dissipation column-to-column box connection structure. The technical problem to be solved by the present invention is achieved through the following technical solutions:

[0005] The present invention provides a self-resetting assembled concrete multi-modal energy-absorbing lower column-column box connection structure, comprising: a precast reinforced concrete lower column, a precast reinforced concrete upper column, a plurality of lower side steel boxes, a plurality of upper side connecting pieces and a plurality of energy-absorbing plate assemblies, wherein:

[0006] The multiple lower steel boxes are correspondingly arranged at the corners of the upper end of the precast reinforced concrete lower column; the multiple upper connecting pieces are correspondingly arranged at the corners of the lower end of the precast reinforced concrete upper column;

[0007] The lower steel box and the upper connecting piece are fixedly connected to each other to realize the connection between the precast reinforced concrete lower column and the precast reinforced concrete upper column;

[0008] The multiple energy consumption plate assemblies are respectively located between two adjacent lower steel boxes, the lower portion of the energy consumption plate assembly is fixedly connected to the precast reinforced concrete lower column, and the upper portion is fixedly connected to the precast reinforced concrete upper column;

[0009] The energy-absorbing plate assembly includes an energy-absorbing friction inner plate and an energy-absorbing friction outer plate. The upper portion of the energy-absorbing friction inner plate is fixedly connected to the precast reinforced concrete upper column, and the lower portion is fixedly connected to the precast reinforced concrete lower column. The energy-absorbing friction outer plate is arranged on the outer side of the lower portion of the energy-absorbing friction inner plate and is connected to the energy-absorbing friction inner plate.

[0010] The contact surface between the energy-absorbing friction outer plate and the energy-absorbing friction inner plate is a curved surface. The energy-absorbing friction outer plate is concave in the middle and convex at the top and bottom in width, so that the energy-absorbing friction outer plate is constricted in the middle and bulged at the bottom and top in thickness and width.

[0011] The side surface of the energy-absorbing friction inner plate in contact with the energy-absorbing friction outer plate is configured as a curved surface to achieve contact with the energy-absorbing friction outer plate.

[0012] In one embodiment of the present invention, the bottom of the lower steel box is fixedly connected to the lower column longitudinal reinforcement reserved at the corner of the precast reinforced concrete lower column;

[0013] The top of the upper connecting piece is fixedly connected to the upper column longitudinal reinforcement reserved at the corner of the precast reinforced concrete upper column;

[0014] The top of the lower steel box and the bottom of the upper connecting piece are fixedly connected correspondingly by steel box fixing bolts.

[0015] In one embodiment of the present invention, a friction plate is provided between the lower steel box and the upper connecting member, and the friction plate is made of NAO material or non-asbestos material.

[0016] In one embodiment of the present invention, the self-resetting assembled concrete multi-modal energy dissipation lower column box connection structure further includes a plurality of lower column U-shaped connecting rods and a plurality of upper column U-shaped connecting rods, wherein:

[0017] The open end of the lower column U-shaped connecting rod is correspondingly welded to the outer side wall of the lower steel box;

[0018] The closed ends of the multiple lower column U-shaped connecting rods are welded together;

[0019] The open end of the upper column U-shaped connecting rod is correspondingly welded to the outer side wall of the upper connecting piece;

[0020] The closed ends of the multiple upper column U-shaped connecting rods are welded together.

[0021] In one embodiment of the present invention, the upper portion of the energy-absorbing friction inner plate is fixedly connected to the prefabricated reinforced concrete upper column via a plurality of friction plate fixing bolts.

[0022] In one embodiment of the present invention, the lower portions of the energy-absorbing friction outer plate and the energy-absorbing friction inner plate are fixedly connected to the prefabricated reinforced concrete lower column via a plurality of friction plate fixing bolts;

[0023] A disc spring is provided between the nut of the friction plate fixing bolt and the energy-absorbing friction outer plate.

[0024] In one embodiment of the present invention, the plurality of friction plate fixing bolts are respectively located at the upper portion and the lower portion of the energy-absorbing friction outer plate.

[0025] In one embodiment of the present invention, a limit block is provided on the energy-absorbing friction inner plate, and the limit block is located above the energy-absorbing friction outer plate.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The self-resetting assembled concrete multi-modal energy dissipation column-to-column box connection structure of the present invention can realize the transformation from friction energy dissipation in a small displacement mode to buckling energy dissipation in a large displacement mode through the provided energy dissipation plate assembly. In the small displacement mode, the column-to-column connection repeatedly opens and closes, driving the energy dissipation friction inner plate and the energy dissipation friction outer plate to slide against each other and dissipate friction energy. When the friction outer plate reaches the limit displacement and the earthquake is still increasing, it will enter the large displacement mode. This mode is generally in a large earthquake, forcing the structure to have a tendency to produce large displacement, and the relative displacement between the friction plates cannot continue to increase. At this time, due to the structural characteristics of the energy-absorbing friction outer plate with a constricted middle portion and bulged upper and lower portions, the energy-absorbing mode will be transformed from friction energy consumption between the energy-absorbing friction inner and outer plates to buckling energy consumption of the energy-absorbing friction outer plate. The buckling portion is the constricted portion in the middle, which can fully utilize the potential of the material and ensure continued stable energy consumption under a large earthquake. The mode of energy consumption conversion from friction to buckling can avoid large displacements that are detrimental to structural safety and prevent major damage or even collapse of the main parts of the structure. The use of multiple modes and multiple mechanisms for energy consumption overcomes the problems of single energy consumption and insufficient energy consumption in existing energy consumption forms, thereby improving the seismic performance of the structure.

[0028] 2. In the self-resetting assembled concrete multi-modal energy-absorbing lower column-column box connection structure of the present invention, the vertical bearing capacity of the precast reinforced concrete upper column and the precast reinforced concrete lower column is directly transmitted through the upper connecting piece, the lower steel box and the concrete in its core. The force is clearly received and the force is clearly transmitted. The bolt connection bears part of the shear force and will bear part of the tensile stress under the action of an earthquake. The energy-absorbing friction plate can also bear part of the bending moment and shear force, and no weak points will be generated on the column and the connection surface.

[0029] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of a prefabricated reinforced concrete lower column and lower steel box provided by an embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of a prefabricated reinforced concrete upper column and upper connecting member provided by an embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram of assembling a friction energy dissipation system provided by an embodiment of the present invention;

[0033] Figure 4 is a schematic diagram of an energy dissipation panel assembly provided by an embodiment of the present invention;

[0034] Figure 5a is a front view of an energy-dissipating friction outer plate provided by an embodiment of the present invention;

[0035] Figure 5b is a side view of an energy-dissipating friction outer plate provided by an embodiment of the present invention;

[0036] Figure 6 This is a schematic diagram of the connection between an upper connecting piece and a lower steel box provided by an embodiment of the present invention;

[0037] Figure 7 This is a schematic diagram of a U-shaped connecting rod provided by an embodiment of the present invention;

[0038] Figure 8 This is a schematic diagram of the overall assembly of a column-to-column box-type connection structure provided by an embodiment of the present invention.

[0039] Icons: 1- Precast reinforced concrete foundation; 2- Precast reinforced concrete lower column; 201- Lower column longitudinal reinforcement 3- Precast reinforced concrete upper column; 301- Upper column longitudinal reinforcement; 4- Side steel box; 401- Lower column U-shaped connecting rod; 402- Lower steel box mounting hole; 5- Upper connecting piece; 501- Upper column U-shaped connecting rod; 502- Upper connecting piece mounting hole; 6- Steel box fixing bolt; 7- Friction plate; 8- Energy-absorbing friction inner plate; 9- Energy-absorbing friction outer plate; 10- Disc spring; 11- Friction plate fixing bolt; 12- Limit block. DETAILED DESCRIPTION

[0040] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the following is a detailed description of a self-resetting assembled concrete multi-modal energy dissipation column-to-column box connection structure proposed in accordance with the present invention, in combination with the accompanying drawings and specific implementation methods.

[0041] The aforementioned and other technical contents, features, and effects of the present invention are clearly presented in the following detailed description of the specific embodiments in conjunction with the accompanying drawings. Through the description of the specific embodiments, a deeper and more specific understanding of the technical means and effects adopted by the present invention to achieve the intended purpose can be obtained. However, the accompanying drawings are provided for reference and illustration purposes only and are not intended to limit the technical solutions of the present invention.

[0042] Example 1

[0043] Please refer to Figure 1 、 Figure 2 and Figure 8 As shown in the figure, the self-resetting assembled concrete multi-modal energy-absorbing lower column-column box connection structure of this embodiment includes: a precast reinforced concrete lower column 2, a precast reinforced concrete upper column 3, a plurality of lower side steel boxes 4, a plurality of upper side connecting parts 5 and a plurality of energy-absorbing plate assemblies.

[0044] Among them, multiple lower steel boxes 4 are correspondingly arranged at the corners of the upper end of the precast reinforced concrete lower column 2; multiple upper connecting parts 5 are correspondingly arranged at the corners of the lower end of the precast reinforced concrete upper column 3; the lower steel boxes 4 and the upper connecting parts 5 are correspondingly fixedly connected to realize the connection between the precast reinforced concrete lower column 2 and the precast reinforced concrete upper column 3; multiple energy consumption plate assemblies are respectively located between two adjacent lower steel boxes 4, and the lower part of the energy consumption plate assembly is fixedly connected to the precast reinforced concrete lower column 2, and the upper part is fixedly connected to the precast reinforced concrete upper column 3.

[0045] In this embodiment, there are four lower steel boxes 4, four upper connecting members 5 and four energy-absorbing plate assemblies.

[0046] In an optional embodiment, the bottom of the lower steel box 4 is fixedly connected to the lower column longitudinal reinforcement 201 reserved at the corner of the prefabricated reinforced concrete lower column 2.

[0047] Optionally, the lower column longitudinal reinforcement 201 in the precast reinforced concrete foundation member 1 is thrown out in advance during prefabrication. The lower column longitudinal reinforcement 201 needs to be tied with stirrups, and the steel bar segments of the lower column longitudinal reinforcement 201 connected to the lower steel box 4 are reserved. Then, concrete is poured to form the precast reinforced concrete lower column 2. The top and bottom of the lower steel box 4 are respectively provided with lower steel box mounting holes 402. The steel bar segments reserved for the lower column longitudinal reinforcement 201 at the four corners of the precast reinforced concrete lower column 2 are respectively placed into the lower steel box mounting holes 402 at the bottom of the lower steel box 4 and fixedly connected by plug welding.

[0048] In an optional embodiment, the top of the upper connecting member 5 is fixedly connected to the upper column longitudinal reinforcement 301 reserved at the corner of the prefabricated reinforced concrete upper column 3.

[0049] Optionally, the upper column longitudinal reinforcement 301 in the precast reinforced concrete upper column 3 is thrown out in advance during prefabrication, and the upper column longitudinal reinforcement 301 needs to be tied with stirrups. The steel bar segments of the upper column longitudinal reinforcement 301 connected to the upper connector 5 are reserved, and then concrete is poured to form the precast reinforced concrete upper column 3. The top and bottom of the upper connector 5 are respectively provided with upper connector mounting holes 502. The reserved steel bar segments of the upper column longitudinal reinforcement 301 at the four corners of the precast reinforced concrete upper column 3 are respectively placed into the upper connector mounting holes 502 at the top of the upper column longitudinal reinforcement 301 and fixedly connected by plug welding.

[0050] In an optional embodiment, the top of the lower steel box 4 and the bottom of the upper connecting member 5 are fixedly connected by steel box fixing bolts 6 .

[0051] Optionally, the precast reinforced concrete upper column 3 is lifted to the corresponding position, the upper connecting piece mounting hole 502 at the bottom of the upper connecting piece 5 and the lower steel box mounting hole 402 at the top of the lower steel box 4 are aligned, the steel box fixing bolt rod 6 is inserted, and fixed with a nut to complete the connection between the precast reinforced concrete lower column 2 and the precast reinforced concrete upper column 3.

[0052] In an optional embodiment, the self-resetting assembled concrete multi-modal energy dissipation lower column box connection structure further includes a plurality of lower column U-shaped connecting rods 401 and a plurality of upper column U-shaped connecting rods 501. The structure diagram of the U-shaped connecting rod is as shown in FIG. Figure 7 shown.

[0053] In this embodiment, there are four lower column U-shaped connecting rods 401 and four upper column U-shaped connecting rods 501. The four lower steel boxes 4 are connected as a whole via the four lower column U-shaped connecting rods 401, wherein the open ends of the lower column U-shaped connecting rods 401 are welded to the outer wall of the lower steel box 4; the closed ends of the four lower column U-shaped connecting rods 401 are welded together. The four upper connecting members 5 are connected as a whole via the four upper column U-shaped connecting rods 501, wherein the open ends of the upper column U-shaped connecting rods 501 are welded to the outer wall of the upper connecting member 5; the closed ends of the four upper column U-shaped connecting rods 501 are welded together.

[0054] In this embodiment, a U-shaped connecting rod is used to fix the lower steel box 4 and the upper connecting piece 5 to facilitate centering and leveling at the construction site. The system formed by the U-shaped connecting rod, the lower steel box 4 and the upper connecting piece 5 has strong bending and shear stiffness. Under the action of a large earthquake, the column-to-column connection is guaranteed to yield later than other parts of the column, thereby achieving the seismic performance goal of "strong connection and weak component".

[0055] Please refer to Figure 6 In an optional embodiment, a friction plate 7 is provided between the lower steel box 4 and the upper connecting member 5. The friction plate 7 is made of NAO material or non-asbestos. In this embodiment, by providing the friction plate 7 of NAO material, the column-column contact part can be effectively protected, the concrete in the connection area can be prevented from being crushed, the compressive resistance of the local concrete can be enhanced, and the overall ductility and stability can be improved.

[0056] Please refer to Figure 3 In an optional embodiment, the energy-absorbing plate assembly includes an energy-absorbing friction inner plate 8 and an energy-absorbing friction outer plate 9. The upper part of the energy-absorbing friction inner plate 8 is fixedly connected to the cylindrical surface of the prefabricated reinforced concrete upper column 3, and the lower part is fixedly connected to the cylindrical surface of the prefabricated reinforced concrete lower column 2; the energy-absorbing friction outer plate 9 is arranged on the outer side of the lower part of the energy-absorbing friction inner plate 8 and is connected to the energy-absorbing friction inner plate 8.

[0057] Please refer to Figure 4 In one alternative embodiment, the contact surface between the energy-dissipating friction outer plate 9 and the energy-dissipating friction inner plate 8 is a curved surface. The width of the energy-dissipating friction outer plate 9 is concave in the middle and convex at the top and bottom, resulting in a tapered center and bulged bottom and top portion thickness and width. Specifically, the width of the upper and lower portions of the energy-dissipating friction outer plate 9 is greater than the width of the center, and the thickness of the upper and lower portions of the energy-dissipating friction outer plate 9 is greater than the thickness of the center. The side surface of the energy-dissipating friction inner plate 8 that contacts the energy-dissipating friction outer plate 9 is designed as a curved surface to ensure a close fit with the energy-dissipating friction outer plate 9.

[0058] Alternatively, as Figure 5a and Figure 5bAs shown, the energy-absorbing friction outer plate 9 is set to be a gourd shape with a constricted lower part in the middle and a bulged upper part. The side of the energy-absorbing friction outer plate 9 in contact with the energy-absorbing friction inner plate 8 is processed into a curved surface. The lower and upper parts of the gourd shape are both concave at both ends and convex in the middle. Correspondingly, the outer side surface of the energy-absorbing friction inner plate 8 is also processed into a curved surface to complement the curved surface of the energy-absorbing friction outer plate 9, so that the energy-absorbing friction inner plate 8 and the energy-absorbing friction outer plate 9 can fit tightly.

[0059] In other optional embodiments, the energy-absorbing friction outer plate 9 can also be set to an hourglass shape or an "8" shape. Similarly, the side of the energy-absorbing friction outer plate 9 in contact with the energy-absorbing friction inner plate 8 is processed into a curved surface, and its lower and upper parts are both concave at both ends and convex in the middle.

[0060] In an optional embodiment, the upper portion of the energy-absorbing friction inner plate 8 is fixedly connected to the prefabricated reinforced concrete upper column 3 via a plurality of friction plate fixing bolts 11 .

[0061] In an alternative embodiment, the lower portions of the energy-absorbing friction outer plate 9 and the energy-absorbing friction inner plate 8 are fixedly connected to the precast reinforced concrete lower column 2 via multiple friction plate fixing bolts 11. Disc springs 10 are disposed between the nuts of the friction plate fixing bolts 11 and the energy-absorbing friction outer plate 9. The multiple friction plate fixing bolts 11 are located at the upper and lower portions of the energy-absorbing friction outer plate 9, respectively.

[0062] In this embodiment, there are four friction plate fixing bolts 11 connected to the precast reinforced concrete upper column 3 , and two friction plate fixing bolts 11 connected to the precast reinforced concrete lower column 2 .

[0063] For example, bolt holes are arranged in a 2x2 array on the upper portion of the energy-absorbing friction inner plate 8, with one bolt hole each located on the upper and lower portions of the energy-absorbing friction outer plate 9. Bolt holes are also located at the corresponding locations where the energy-absorbing friction inner plate 8 and the energy-absorbing friction outer plate 9 connect. During installation, the energy-absorbing friction inner plate 8 is placed on the side surface of the connection between the precast reinforced concrete lower column 2 and the precast reinforced concrete upper column 3. Four friction plate fixing bolts 11 are inserted through the four bolt holes on the upper portion of the energy-absorbing friction inner plate 8, securing the energy-absorbing friction inner plate 8 to the cylindrical surface of the precast reinforced concrete upper column 3. Then place the energy-absorbing friction outer plate 9 on the outside of the energy-absorbing friction inner plate 8 so that the curved surface of the energy-absorbing friction outer plate 9 and the curved surface of the energy-absorbing friction inner plate 8 fit each other, then insert the two friction plate fixing bolts 11, and insert the disc spring 10 into the bolt rod, use the nut to fix the energy-absorbing friction outer plate 9 and the disc spring 10 together, and apply pre-pressure to the disc spring 10 to complete the assembly of the entire column-to-column connection structure.

[0064] In this embodiment, pre-pressure is applied to each disc spring 10 by pre-tightening the friction plate fixing bolts 11 to provide initial bending stiffness. Under the action of an earthquake, the disc spring 10 is compressed and deformed to provide sufficient restoring force. The elasticity of the disc spring 10 is used to achieve self-reset, thereby reducing residual deformation at the column-column connection.

[0065] In an optional embodiment, a limit block 12 is provided on the energy-absorbing friction inner plate 8. The limit block 12 is located above the energy-absorbing friction outer plate 9. When the column is in a vibrating state, the limit block 12 is used to limit the displacement between the energy-absorbing friction outer plate 9 and the energy-absorbing friction inner plate 8.

[0066] In this embodiment, the energy dissipation plate assembly (energy dissipation friction inner plate 8 and energy dissipation friction outer plate 9) is configured to achieve a transition from friction energy dissipation in a small displacement mode to buckling energy dissipation in a large displacement mode. When the connected column-column main structure is subjected to earthquake action, two energy dissipation modes can be divided according to the relative displacement between the energy dissipation friction inner plate 8 and the energy dissipation friction outer plate 9. In the small displacement mode, the column-column connection repeatedly opens and closes, driving the energy dissipation friction inner plate 8 and the energy dissipation friction outer plate 9 to slide against each other and dissipate energy. In this embodiment, the contact surface between the energy dissipation friction inner plate 8 and the energy dissipation friction outer plate 9 is configured as a curved surface, which increases the contact area between the two, thereby increasing the sliding friction energy dissipation. When the energy-absorbing friction outer plate 9 reaches the limit displacement, that is, the upper end of the energy-absorbing friction outer plate 9 contacts the limit block 12, if the earthquake is still increasing, it will enter the large displacement mode. This mode is generally in a large earthquake, forcing the main structure to have a tendency to produce large displacement. However, due to the effect of the limit block 12, the relative displacement between the energy-absorbing friction inner plate 8 and the energy-absorbing friction outer plate 9 cannot continue to increase. At this time, due to the structural characteristics of the energy-absorbing friction outer plate 9 (wide and thick at the top and bottom, thin and thin in the middle), the energy-absorbing mode will be composed of the energy-absorbing friction inner plate 8 and the energy-absorbing friction outer plate 9. The friction energy consumption between the energy-absorbing friction outer plates 9 is converted into the buckling energy consumption of the energy-absorbing friction outer plates 9. The buckling part is the constricted part in the middle of the energy-absorbing friction outer plates 9, which can give full play to the potential of the material and continue to consume energy stably under a large earthquake. The mode of converting friction energy consumption into buckling energy consumption can avoid the generation of large displacement that is not conducive to the safety of the main structure, and avoid major damage or even collapse of the main parts of the structure. The use of multi-modal and multi-mechanism for energy consumption overcomes the problems of single energy consumption form and insufficient energy consumption in the existing energy consumption, and improves the seismic performance of the structure.

[0067] Furthermore, during the energy dissipation process in both modes, the NAO friction plate 7 between the lower steel box 4 and the upper connector 5 also exerts a frictional energy dissipation effect, complementing the energy dissipation effect. Furthermore, the energy-dissipating friction inner plate 8 and the energy-dissipating friction outer plate 9 are fully bolted together, making them easy to repair and replace after an earthquake.

[0068] The self-resetting assembled concrete multi-modal energy-dissipating column-to-column box connection structure of this embodiment, through the provided energy-dissipating plate assembly, can achieve the transformation from friction energy dissipation in a small displacement mode to buckling energy dissipation in a large displacement mode. Utilizing multi-modal and multi-mechanism energy dissipation, it overcomes the problems of single and insufficient energy dissipation in existing forms, and improves the seismic performance of the structure. The vertical bearing capacity of the precast reinforced concrete upper column and the precast reinforced concrete lower column is directly transmitted through the upper connecting piece, the lower steel box, and the concrete in its core. The force is clearly received and the force is clearly transmitted. The bolt connection bears part of the shear force and will bear part of the tensile stress under the action of an earthquake. The energy-dissipating friction plate can also bear part of the bending moment and shear force, and no weak points will be generated in the column and the connection surface.

[0069] In addition, the self-resetting prefabricated concrete multi-modal energy-absorbing lower column box-type connection structure of this embodiment, the prefabricated reinforced concrete upper column, the prefabricated reinforced concrete lower column and various energy-absorbing components can all be manufactured in the factory and assembled directly on site. The process is simple and the requirements for construction personnel are not high. It can greatly reduce on-site concrete wet work and various complex grouting processes, meet the development concept of green and environmentally friendly prefabricated buildings under the background of "dual carbon", have high construction efficiency, and have the dual advantages of practicality and feasibility.

[0070] It should be noted that, in this document, the terms "comprises", "includes" or any other variations are intended to cover non-exclusive inclusion, so that an article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed. In the absence of further restrictions, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the article or device comprising the element. Words such as "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The directions or positional relationships indicated by "upper", "lower", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as a limitation on the invention.

[0071] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A self-resetting assembled concrete multi-modal energy dissipation column-to-column box connection structure, characterized in that: include: A prefabricated reinforced concrete lower column (2), a prefabricated reinforced concrete upper column (3), a plurality of lower side steel boxes (4), a plurality of upper side connecting members (5) and a plurality of energy-absorbing plate assemblies, wherein: The plurality of lower steel boxes (4) are correspondingly arranged at the corners of the upper end of the precast reinforced concrete lower column (2); the plurality of upper connecting members (5) are correspondingly arranged at the corners of the lower end of the precast reinforced concrete upper column (3); The lower steel box (4) and the upper connecting piece (5) are fixedly connected to each other to realize the connection between the prefabricated reinforced concrete lower column (2) and the prefabricated reinforced concrete upper column (3); The plurality of energy-consuming plate assemblies are respectively located between two adjacent lower steel boxes (4); the lower portion of the energy-consuming plate assembly is fixedly connected to the precast reinforced concrete lower column (2), and the upper portion is fixedly connected to the precast reinforced concrete upper column (3); The energy-absorbing plate assembly comprises an energy-absorbing friction inner plate (8) and an energy-absorbing friction outer plate (9), wherein the upper portion of the energy-absorbing friction inner plate (8) is fixedly connected to the precast reinforced concrete upper column (3), and the lower portion is fixedly connected to the precast reinforced concrete lower column (2); the energy-absorbing friction outer plate (9) is arranged on the outer side of the lower portion of the energy-absorbing friction inner plate (8) and is connected to the energy-absorbing friction inner plate (8); The contact surface between the energy-absorbing friction outer plate (9) and the energy-absorbing friction inner plate (8) is a curved surface. The energy-absorbing friction outer plate (9) is concave in the middle and convex in the upper and lower parts in terms of width, so that the energy-absorbing friction outer plate (9) is constricted in the middle and bulged in the lower and upper parts in terms of thickness and width. The side surface of the energy-absorbing friction inner plate (8) in contact with the energy-absorbing friction outer plate (9) is configured as a curved surface to achieve contact with the energy-absorbing friction outer plate (9); The lower parts of the energy-absorbing friction outer plate (9) and the energy-absorbing friction inner plate (8) are fixedly connected to the prefabricated reinforced concrete lower column (2) via a plurality of friction plate fixing bolts (11); a disc spring (10) is provided between the nut of the friction plate fixing bolt (11) and the energy-absorbing friction outer plate (9); a limiting block (12) is provided on the energy-absorbing friction inner plate (8), and the limiting block (12) is located above the energy-absorbing friction outer plate (9).

2. The self-resetting assembled concrete multi-modal energy dissipation column-to-column box connection structure according to claim 1 is characterized in that: The bottom of the lower steel box (4) is fixedly connected to the lower column longitudinal reinforcement (201) reserved at the corner of the prefabricated reinforced concrete lower column (2); The top of the upper connecting member (5) is fixedly connected to the upper column longitudinal reinforcement (301) reserved at the corner of the prefabricated reinforced concrete upper column (3); The top of the lower steel box (4) and the bottom of the upper connecting piece (5) are fixedly connected correspondingly via steel box fixing bolts (6).

3. The self-resetting assembled concrete multi-modal energy dissipation column-to-column box connection structure according to claim 1 is characterized in that: A friction plate (7) is provided between the lower steel box (4) and the upper connecting member (5), and the friction plate (7) is non-asbestos.

4. The self-resetting assembled concrete multi-modal energy dissipation column-to-column box connection structure according to claim 1 is characterized in that: It also includes a plurality of lower column U-shaped connecting rods (401) and a plurality of upper column U-shaped connecting rods (501), wherein: The open end of the lower column U-shaped connecting rod (401) is correspondingly welded to the outer side wall of the lower steel box (4); The closed ends of the plurality of lower column U-shaped connecting rods (401) are welded together; The open end of the upper column U-shaped connecting rod (501) is correspondingly welded to the outer side wall of the upper connecting piece (5); The closed ends of the plurality of upper column U-shaped connecting rods (501) are welded to each other.

5. The self-resetting assembled concrete multi-modal energy dissipation column-to-column box connection structure according to claim 1 is characterized in that: The upper portion of the energy-absorbing friction inner plate (8) is fixedly connected to the prefabricated reinforced concrete upper column (3) via a plurality of friction plate fixing bolts (11).

6. The self-resetting assembled concrete multi-modal energy dissipation column-to-column box connection structure according to claim 1 is characterized in that: The plurality of friction plate fixing bolts (11) are respectively located at the upper portion and the lower portion of the energy-absorbing friction outer plate (9).

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