Self-resetting energy dissipation box-type connecting column and construction method thereof

Abstract

The application discloses a self-resetting energy-consuming box type connecting column and a construction method thereof, and relates to the field of building structures.The self-resetting energy-consuming box type connecting column comprises a reinforced concrete structure upper precast column, a reinforced concrete structure lower precast column, prestressed high-strength bolt rods and energy-consuming steel plates;notches are formed at the side surface junctions of the outer surfaces of each precast column, and steel boxes are fixed in the notches;inlayed steel plates are arranged in the concrete near the side surface and the end surface of each precast column near the connecting end area;the end portions of the upper precast column and the lower precast column are attached and connected through the prestressed high-strength bolt rods which pass through the steel boxes;and energy-consuming steel plates containing two hollow L shapes are arranged on the outer surfaces corresponding to the inlayed steel plate connecting areas on the side surfaces of the column connecting portions.The elastic restoring force of the high-strength prestressed bolt rods can realize the self-resetting function and ensure layer-by-layer assembly;the L-shaped energy-consuming steel plates have excellent shearing resistance and energy-consuming performance;the application can improve the node bearing capacity, improve the seismic performance, save costs and facilitate construction.

Description

Technical Field

[0001] This invention belongs to the field of prefabricated concrete building technology, specifically relating to a self-resetting energy-dissipating box-type connecting column and its construction method. Background Technology

[0002] In precast reinforced concrete frame structures, the connection technology of precast component joints is a core technology. The seismic performance of precast buildings largely depends on the reliability of beam-column joint connections. Investigations of major earthquakes have revealed that in buildings where precast frame structures collapsed, the damage to precast components was relatively minor; the main cause of collapse was the failure of connections between precast components. Therefore, ensuring the effectiveness of precast component connections and the rationality of joint design are crucial to guaranteeing structural safety and serviceability.

[0003] Currently, existing dry connection nodes for prefabricated concrete frame structures still need to address the following issues:

[0004] (1) The precast beam-column connection node is called the node core area, which is the core area of ​​the main structure. It is under the combined stress of bending moment, shear force and axial force in the structure, so as to assist the beams, columns and other components to form an integral structure to resist external loads. Therefore, it is necessary to weaken the components of the node to control the occurrence of plastic hinges at the beam ends during earthquakes. The seismic force is dissipated through the plastic hinges to prevent the components from failing before the node and affecting the overall structural safety, so as to meet the design concept of "strong node and weak component" and meet the seismic fortification requirements of "no damage in small earthquakes, repairable in moderate earthquakes, and no collapse in large earthquakes".

[0005] (2) Premature failure of the core area of ​​the node or the column end will affect the safety of the overall structure. During a major earthquake, although it has good deformation capacity, its bearing capacity is insufficient, or it has sufficient bearing capacity but insufficient energy dissipation capacity. Existing dry beam-column connection nodes are difficult to balance bearing capacity and deformation performance at the same time.

[0006] (3) Currently, the self-resetting ability of nodes often relies on unbonded prestressed tendons. Although this can improve the self-resetting ability of the structure after the earthquake, its energy dissipation capacity is weak, and it will generate a large stress concentration at the beam end, making the concrete at the beam end prone to damage, resulting in a weakening of the bending performance of the beam-column joint. Moreover, if only prestressed tendons are used to resist bending moment and bear shear force, there will inevitably be a certain stress loss, leading to a worse self-resetting ability after the earthquake.

[0007] Therefore, researching and developing a dry connection node that is simple to assemble, has a wide range of applications, can effectively dissipate seismic energy during earthquakes, and ensures minimal deformation or restoration to the initial state after earthquake damage is of great significance to the development of prefabricated buildings. Summary of the Invention

[0008] To address the aforementioned problems in the existing technology, this invention provides a self-resetting energy-dissipating box-type connecting column and its construction method. The technical problem to be solved by this invention is achieved through the following technical solution:

[0009] In a first aspect, embodiments of the present invention provide a self-resetting energy-dissipating box-type connecting post, comprising:

[0010] The structure comprises upper and lower precast columns of reinforced concrete, as well as prestressed high-strength bolts and energy-dissipating steel plates. Each precast column has a slot at the junction of its outer surface and a steel box fixed within the slot. Embedded steel plates are installed within the concrete on the side and end faces of each precast column near the connection point. The ends of the upper and lower precast columns are fitted together and connected by prestressed high-strength bolts fixed through the steel boxes. Furthermore, an energy-dissipating steel plate comprising two hollow L-shapes is installed on the outer surface corresponding to the embedded steel plate connection area on the side of the column connection.

[0011] In one embodiment of the present invention, the slot of the upper precast column is located at one-third of the distance from the top of the upper precast column; the slot of the lower precast column is located at one-third of the distance from the bottom of the lower precast column.

[0012] In one embodiment of the present invention, the steel box in each precast column is anchored to the concrete of the precast column by U-shaped stirrups embedded in the precast column.

[0013] In one embodiment of the present invention, each precast column has pre-drilled vertically aligned channels on its end face, the embedded steel plate on the end face, and the steel box; each prestressed high-strength bolt rod passes through the corresponding channel and is fixed to the steel box through which it passes by a nut.

[0014] In one embodiment of the present invention, hollow L-shaped sections cover the column connection points in the energy-dissipating steel plates on each side.

[0015] In one embodiment of the present invention, the two L-shapes in the energy-consuming steel plate are identical, and one L is obtained by rotating the plane of the other L by 180 degrees.

[0016] In one embodiment of the present invention, a set of energy-consuming steel plates on opposite sides are of the same height and are connected by tie bolts that penetrate the column; and the tie bolts used to connect the energy-consuming steel plates on adjacent sides are staggered vertically to achieve spatial avoidance.

[0017] Secondly, embodiments of the present invention provide a construction method for a self-resetting energy-dissipating box-type connecting column, the method comprising:

[0018] The upper and lower precast columns are fabricated; each precast column has a groove on its outer surface, a steel box is fixed in the groove, and each precast column has an embedded steel plate on its side and end face near the connection end area.

[0019] To fix the lower precast column, insert the prestressed high-strength bolt rod into the reserved hole of the lower precast column, and extend it a certain distance out of the steel box and fix it with a nut;

[0020] The upper precast column is hoisted, and the prestressed high-strength bolt is inserted into the reserved hole of the upper precast column and extended a certain distance out of the steel box and fixed with nuts to form a structural body in which the upper and lower columns fit together.

[0021] An energy-dissipating steel plate is installed on the outer surface corresponding to the embedded steel plate connection area on the side of the column connection; wherein, the energy-dissipating steel plate on each side comprises two hollow L-shaped plates.

[0022] In one embodiment of the present invention, the manufacturing process of each precast column includes:

[0023] The precast column is supported by formwork, and a groove is reserved at the junction of the outer surface of the precast column on the model.

[0024] Embedded steel plates are installed on the sides and end faces of the model near the connection end area; wherein, the embedded steel plates on the end faces have reserved channels;

[0025] Concrete is poured into the obtained model to obtain a reinforced concrete column structure; wherein, a channel is reserved on the end face of the reinforced concrete column structure and is aligned with the channel reserved in the embedded steel plate on the end face.

[0026] A steel box is placed in the slot of the reinforced concrete column structure, and the steel box is anchored to the concrete by U-shaped stirrups pre-embedded in the reinforced concrete column structure; wherein, a channel is reserved on the side of the steel box near the connection end, and the reserved channel is aligned with the reserved channel on the end face of the reinforced concrete column structure and the embedded steel plate of the end face; the side of the steel box away from the connection end is welded to the longitudinal reinforcement in the precast column.

[0027] In one embodiment of the present invention, the process of installing an energy-dissipating steel plate on the outer surface corresponding to the embedded steel plate connection area on the side of the column connection includes:

[0028] The first set of energy-consuming steel plates on the opposite side are set to the same height and connected by tie bolts that penetrate the column.

[0029] The second set of energy-consuming steel plates on the opposite side is set to the same height, but the height is staggered from the height of the first set of energy-consuming steel plates. The second set of energy-consuming steel plates is connected by tie bolts that pass through the column, so that the tie bolts used by the two sets of energy-consuming steel plates can avoid each other in space.

[0030] The self-resetting energy-dissipating box-type connecting column provided in this invention is a novel dry connection node for prefabricated concrete frame structures. It is simple to assemble, widely applicable, and can effectively dissipate seismic energy during earthquakes, ensuring minimal deformation or restoration to the initial state after earthquake damage. Compared to existing technologies, it has the following advantages:

[0031] (1) During an earthquake, the energy-dissipating steel plate absorbs seismic energy through elastic-plastic deformation to achieve the purpose of energy dissipation. The L-shaped design of the energy-dissipating steel plate ensures the shear bearing capacity of the structure. The elastic restoring force of the high-strength prestressed bolt rod can not only achieve the self-resetting function, but also ensure the layer-by-layer assembly.

[0032] (2) This self-resetting energy-dissipating box-type connecting column is an energy-dissipating connector, and the designed L-shaped energy-dissipating steel plate has excellent shear resistance and energy dissipation performance. Experimental studies have shown that the L-shaped design can optimize the shear resistance of the steel plate. When an earthquake occurs, the energy-dissipating steel plate can fully utilize its ductility to dissipate energy while ensuring sufficient load-bearing capacity to ensure the safety of the main structure.

[0033] (3) The self-resetting energy-dissipating box-type connecting column achieves column-to-column connection through a combination of pre-embedded steel plates, energy-dissipating steel plates, and prestressed high-strength bolt rods, which can improve the bearing capacity of the nodes. When a major earthquake occurs, it can meet the design concept of "strong nodes, weak components", control the occurrence of plastic hinges at the node position, and achieve the effect of vibration reduction through the energy-dissipating yielding of the nodes, thereby improving the seismic performance of the structure.

[0034] (4) The precast columns in this embodiment of the invention are in the form of pipe pile columns, which are lightweight, have good cross-sectional expansion, and are easy to transport and hoist on the construction site, thus effectively saving production costs, transportation costs, and construction costs. They conform to the design concept of green prefabricated buildings.

[0035] (5) The precast columns in the embodiments of the present invention can all be prefabricated in the factory and directly assembled and poured on site, which can save most of the on-site pouring work, save time and effort, and be efficient and environmentally friendly. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the overall installation arrangement of a self-resetting energy-dissipating box-type connecting column provided in an embodiment of the present invention;

[0037] Figure 2 This is a schematic diagram of the embedded steel plate provided in an embodiment of the present invention;

[0038] Figure 3 This is a partial enlarged view of the upper precast column provided in an embodiment of the present invention;

[0039] Figure 4 This is a schematic diagram of the steel box structure used for the upper precast column in an embodiment of the present invention;

[0040] Figure 5 This is a schematic diagram of the structure of the U-shaped stirrup provided in an embodiment of the present invention;

[0041] Figure 6 This is a schematic diagram of the structure of the energy-consuming steel plate provided in an embodiment of the present invention;

[0042] Figure 7 This is a schematic flowchart illustrating a construction method for a self-resetting energy-dissipating box-type connecting column provided in an embodiment of the present invention.

[0043] Figure 8 This is a schematic diagram of the upper precast column provided in an embodiment of the present invention;

[0044] Figure 9 This is a partially enlarged view provided for understanding the spatial avoidance achieved by tie bolts in an embodiment of the present invention. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] To achieve a dry connection node that is simple to assemble, widely applicable, and can effectively dissipate seismic energy during an earthquake, ensuring minimal deformation or recovery to its initial state after earthquake damage, this invention provides a self-resetting energy-dissipating box-type connection column and its construction method.

[0047] Below, we will first introduce a self-resetting energy-dissipating box-type connecting column provided in the embodiments of the present invention.

[0048] like Figure 1 As shown, the self-resetting energy-dissipating box-type connecting post provided in this embodiment of the invention may include:

[0049] The structure comprises upper and lower precast columns of reinforced concrete, as well as prestressed high-strength bolts and energy-dissipating steel plates. Each precast column has a slot at the junction of its outer surface and a steel box fixed within the slot. Embedded steel plates are installed within the concrete on the side and end faces of each precast column near the connection point. The ends of the upper and lower precast columns are fitted together and connected by prestressed high-strength bolts fixed through the steel boxes. Furthermore, an energy-dissipating steel plate containing two hollow L-shapes is installed on the outer surface corresponding to the connection area of ​​the embedded steel plate on the side of the column connection.

[0050] The embodiments of the present invention include Figure 1 In the drawings, 1 represents the upper column longitudinal reinforcement, i.e. the longitudinal reinforcement of the upper precast column; 2 represents the upper precast column; 3 represents the U-shaped stirrup; 4 represents the prestressed high-strength bolt rod; 5 represents the steel box; 6 represents the embedded steel plate; 7 represents the energy-dissipating steel plate; 8 represents the lower precast column; and 9 represents the lower column longitudinal reinforcement, i.e. the longitudinal reinforcement of the lower precast column.

[0051] To ensure clarity and ease of understanding, the self-resetting energy-dissipating box-type connecting column will be explained in two parts below.

[0052] 1) Precast columns

[0053] In this embodiment of the invention, the upper and lower precast columns are prefabricated in a factory using the same manufacturing method and column structure, only in opposite directions. For details regarding the manufacturing process of each precast column, please refer to the section on the construction method of the self-resetting energy-dissipating box-type connecting column.

[0054] In this embodiment of the invention, each precast column is a reinforced concrete structure with multiple longitudinal bars running from top to bottom inside, secured by transverse stirrups. The outer surface of each precast column is concrete, but embedded steel plates are installed within the concrete on the sides and ends near the connection points. For details on the structure of the embedded steel plates, please refer to [link to relevant documentation]. Figure 2 As shown, the circles represent the holes for bolts used to secure the embedded steel plate.

[0055] Specifically, the four sides and bottom of the lower part of the upper precast column are fitted with embedded steel plates in the concrete, and the steel plates are welded together; the four sides and top of the upper part of the lower precast column are fitted with embedded steel plates in the concrete, and the steel plates are welded together; the embedded steel plates on the four sides of each precast column are of the same size and the same height, and together with the embedded steel plates at the ends, they form an enclosing structure in the area near the connection end of the precast column to restrain the concrete and improve the load-bearing capacity of the precast column.

[0056] Each precast column has a slot at the junction of its outer surface and the sides. It can be understood that since the precast column is usually rectangular, there can be a total of four slots at the corresponding positions of the four side junctions. The slots are symmetrical to each other, and each slot provides an inward recessed space for placing a steel box.

[0057] In this embodiment of the invention, the steel box is used to fix the prestressed high-strength bolt rod, thereby using the prestressed high-strength bolt rod to connect the upper precast column and the lower precast column. Therefore, considering the stability of the prestressed high-strength bolt rod fixation, in one possible embodiment, the slot of the upper precast column is located at one-third of the distance from the top of the upper precast column; the slot of the lower precast column is located at one-third of the distance from the bottom of the lower precast column.

[0058] In each precast column, the steel box has a pre-drilled hole on the side near the connection end to facilitate the insertion of prestressed high-strength bolts. The side of the steel box away from the connection end does not have a hole and is pre-welded to the longitudinal reinforcement in the precast column so that the steel box can be fixed and supported by the longitudinal reinforcement.

[0059] For details, please refer to [link / reference]. Figure 3 and Figure 4 understand, Figure 3 This is a magnified view of a portion of the precast upper column. Figure 4 This is a structural diagram of the steel box used for the upper precast columns. From Figure 3 and Figure 4 As can be seen, the lower side of the steel box of the upper precast column has channels for inserting prestressed high-strength bolts, while the upper side is directly welded to the longitudinal reinforcement inside the precast column. For the lower precast column, the direction is reversed; the upper side of the steel box has channels for inserting prestressed high-strength bolts, while the lower side is directly welded to the longitudinal reinforcement inside the precast column. This can be combined with… Figure 1 Therefore, detailed enlarged images and steel box structure diagrams will not be provided here for further explanation.

[0060] In one optional embodiment, in order to enhance the supporting force on the steel box, the diameter of the longitudinal reinforcement welded to the steel box can be larger than the diameter of the other longitudinal reinforcements in the precast column and the prestressed high-strength bolt rod.

[0061] Furthermore, the steel box within each precast column is anchored to the concrete of the precast column via U-shaped stirrups embedded within the column. For details regarding the structure of the U-shaped stirrups, please refer to [link to relevant documentation]. Figure 5 As shown.

[0062] Furthermore, to facilitate the insertion of prestressed high-strength bolts, each precast column has pre-drilled aligned holes on its end face, the embedded steel plate on the end face, and the steel box. The end face of the upper precast column refers to its bottom surface, while the end face of the lower precast column refers to its top surface.

[0063] Therefore, during the fabrication of each precast column, for each prestressed high-strength bolt, the diameter of each hole needs to be determined based on the diameter of the prestressed high-strength bolt, with an appropriate margin. The corresponding hole positions on the end face of the precast column, the embedded steel plate on the end face, and the upper and lower holes of the steel box need to be located according to the insertion position of the prestressed high-strength bolt, so that each hole is aligned vertically, so that the prestressed high-strength bolt can be smoothly inserted into these holes later.

[0064] 2) Column connection

[0065] The upper and lower precast columns are connected by prestressed high-strength bolts. Each prestressed high-strength bolt passes through a corresponding hole and is fixed to the steel box through which it passes by with a nut. Specifically, after the prestressed high-strength bolt passes through the steel box, it extends a certain distance out of the steel box and is then tightened with a nut to achieve fixation. (See [reference needed]). Figure 1 and Figure 3 understand.

[0066] This invention utilizes prestressed high-strength bolts to connect the upper and lower precast columns, ensuring layer-by-layer assembly while achieving self-resetting energy dissipation in the connection structure. Compared to the traditional construction method of using prestressed steel strands running through the column from top to bottom, this invention is equivalent to disassembling the column layer by layer and then assembling each precast column as a layer unit using prestressed high-strength bolts, which is more conducive to assembly. Furthermore, the elastic restoring force of the high-strength prestressed bolts also enables a self-resetting function.

[0067] Prestressed high-strength bolts connect the upper and lower precast columns, allowing their ends to fit together to form a seismic-resistant structural body. For this seismic-resistant structural body, an energy-dissipating steel plate is installed on the outer surface corresponding to the embedded steel plate connection area on each side of the column connection. Each energy-dissipating steel plate has the same shape, containing two hollow L-shapes. For details on the structure of the energy-dissipating steel plates, please refer to [link to relevant documentation]. Figure 6 As shown. Figure 6 In the diagram, the areas containing the two L's are hollow; the circles represent the holes for the tie bolts used to secure the energy-consuming steel plates.

[0068] During an earthquake, the energy-dissipating steel plate of this embodiment absorbs seismic energy through elastoplastic deformation, thereby dissipating energy. Specifically, the energy-dissipating steel plate adopts an L-shaped design. The L-shaped energy-dissipating band design not only ensures that the energy-dissipating steel plate can effectively and persistently perform its energy-dissipating performance, but also avoids out-of-plane instability that could lead to premature withdrawal, thus ensuring the shear bearing capacity and energy dissipation performance of the structure.

[0069] Among the energy-dissipating steel plates on each side, hollow L-shaped covers are used at the column connection points. That is, the L-shape is longitudinally oriented, passing through the connection point of the upper and lower precast columns, so that the length of the L-shape covers a portion of both the upper and lower precast columns. This design is based on experimental studies confirming that plastic deformation is mainly distributed on the vertical energy-dissipating zone, and is more severe in the area near the horizontal energy-dissipating zone. Only the elements at the intersection of the vertical and horizontal energy-dissipating zones show significant failure. In one optional embodiment, the horizontal central axis of the L-shape can be close to the connection surface of the upper and lower precast columns.

[0070] To simplify the design, the two L-shapes in the energy-consuming steel plate are identical, and one L is obtained by rotating the plane of the other L by 180 degrees.

[0071] Furthermore, the energy-dissipating steel plates on opposite sides are of the same height and are connected by tie bolts that penetrate the column; the tie bolts used to connect adjacent energy-dissipating steel plates are staggered vertically to achieve spatial avoidance. Please refer to [link / reference] for details. Figure 1 The two sides where the energy-consuming steel plate is located are understandable. Figure 1 The energy-dissipating steel plate on the left side and the energy-dissipating steel plate on the opposite side are of the same height and are connected to the opposite side by tie bolts that pass through the column and through the corresponding embedded steel plates. Therefore, the tie bolts are distributed laterally in the seismic main body of the structure.

[0072] Similarly, Figure 1 The energy-consuming steel plate on the right side and the energy-consuming steel plate on the opposite side are of the same height and are connected to the opposite side by tie bolts that pass through the column and through the corresponding embedded steel plates. Therefore, in order to prevent these two sets of laterally distributed tie bolts from intersecting in space, the height difference between the adjacent energy-consuming steel plates needs to be reasonably determined based on the position of the tie bolts on the energy-consuming steel plates and the diameter of the tie bolts.

[0073] The self-resetting energy-dissipating box-type connecting column provided in this invention is a novel dry connection node for prefabricated concrete frame structures. It is simple to assemble, widely applicable, and can effectively dissipate seismic energy during earthquakes, ensuring minimal deformation or restoration to the initial state after earthquake damage. Compared to existing technologies, it has the following advantages:

[0074] (1) During an earthquake, the energy-dissipating steel plate absorbs seismic energy through elastic-plastic deformation to achieve the purpose of energy dissipation. The L-shaped design of the energy-dissipating steel plate ensures the shear bearing capacity of the structure. The elastic restoring force of the high-strength prestressed bolt rod can not only achieve the self-resetting function, but also ensure the layer-by-layer assembly.

[0075] (2) This self-resetting energy-dissipating box-type connecting column is an energy-dissipating connector, and the designed L-shaped energy-dissipating steel plate has excellent shear resistance and energy dissipation performance. Experimental studies have shown that the L-shaped design can optimize the shear resistance of the steel plate. When an earthquake occurs, the energy-dissipating steel plate can fully utilize its ductility to dissipate energy while ensuring sufficient load-bearing capacity to ensure the safety of the main structure.

[0076] (3) The self-resetting energy-dissipating box-type connecting column achieves column-to-column connection through a combination of pre-embedded steel plates, energy-dissipating steel plates, and prestressed high-strength bolt rods, which can improve the bearing capacity of the nodes. When a major earthquake occurs, it can meet the design concept of "strong nodes, weak components", control the occurrence of plastic hinges at the node position, and achieve the effect of vibration reduction through the energy-dissipating yielding of the nodes, thereby improving the seismic performance of the structure.

[0077] (4) The precast columns in this embodiment of the invention are in the form of pipe pile columns, which are lightweight, have good cross-sectional expansion, and are easy to transport and hoist on the construction site, thus effectively saving production costs, transportation costs, and construction costs. They conform to the design concept of green prefabricated buildings.

[0078] (5) The precast columns in the embodiments of the present invention can all be prefabricated in the factory and directly assembled and poured on site, which can save most of the on-site pouring work, save time and effort, and be efficient and environmentally friendly.

[0079] The following is a detailed description of the construction method for the self-resetting energy-dissipating box-type connecting column according to an embodiment of the present invention. Figure 7 As shown, the construction method of this self-resetting energy-dissipating box-type connecting column may include the following steps:

[0080] S1, Construct the upper precast columns and the lower precast columns;

[0081] Each precast column has a slot on its outer surface, a steel box fixed inside the slot, and an embedded steel plate on the side and end face of each precast column near the connection end area.

[0082] In this embodiment of the invention, the structure and preparation method of the upper and lower precast columns are completely identical. The manufacturing process of each precast column includes:

[0083] S11, formwork is provided for the precast column, and a groove is reserved at the junction of the outer surface of the precast column on the model.

[0084] During the process of setting up the formwork and tying the reinforcing bars, longitudinal reinforcing bars are reserved for supporting the steel box.

[0085] S12, An embedded steel plate is provided on the side and end face of the obtained model near the connection end area;

[0086] The embedded steel plate on the end face has pre-drilled holes.

[0087] S13, pour concrete into the obtained model to obtain a reinforced concrete column structure;

[0088] The reinforced concrete column structure has pre-drilled holes on its end face, which are aligned with the holes pre-drilled in the embedded steel plate on the end face.

[0089] S14, a steel box is placed in the slot of the reinforced concrete column structure, and the steel box is anchored to the concrete by the U-shaped stirrups pre-embedded in the reinforced concrete column structure.

[0090] The steel box has a pre-drilled hole on the side near the connection end, and the pre-drilled hole is aligned with the pre-drilled hole on the end face of the reinforced concrete column and the embedded steel plate on the end face. The side of the steel box away from the connection end is welded to the longitudinal reinforcement in the precast column.

[0091] Please refer to the completed precast columns. Figure 8 As shown, Figure 8 This is a structural diagram of the upper precast column. The lower precast column has the same structure as the upper precast column, but in the opposite direction, and will not be shown or explained here.

[0092] S2, Fix the lower precast column by inserting the prestressed high-strength bolt rod into the reserved hole of the lower precast column and extending it a certain distance out of the steel box and fixing it with a nut;

[0093] S3, hoist the upper precast column, insert the prestressed high-strength bolt rod into the reserved hole of the upper precast column, and extend it a certain distance out of the steel box and fix it with nuts to form the main structure of the upper and lower columns fitting together;

[0094] S4, Install an energy-dissipating steel plate on the outer surface corresponding to the embedded steel plate connection area on the side of the column connection.

[0095] Specifically, S4 includes the following steps:

[0096] S41, set the first set of energy-consuming steel plates on the opposite side to have the same height, and connect the first set of energy-consuming steel plates by tie bolts that penetrate the column;

[0097] S42, the second set of energy-consuming steel plates on the opposite side is set to the same height, but the height is staggered from the height of the first set of energy-consuming steel plates, and the second set of energy-consuming steel plates is connected by tie bolts that penetrate the column, so that the tie bolts used by the two sets of energy-consuming steel plates can achieve spatial avoidance.

[0098] For information on achieving space avoidance with tie bolts, please refer to [link / reference]. Figure 9 understand, Figure 9 yes Figure 1 In the enlarged view, the larger circle shows a height difference between the top edges of the energy-consuming steel plates on the two adjacent sides. Therefore, the tie bolts corresponding to the two energy-consuming steel plates are on different planes, allowing for spatial avoidance.

[0099] Each side of the energy-dissipating steel plate contains two hollow L-shaped sections. Please refer to the previous text for details on the structure of the energy-dissipating steel plate. Figure 6 This will not be repeated here.

[0100] The solution provided in this invention provides a self-resetting energy-dissipating box-type connecting column as a new dry connection node for prefabricated concrete frame structures by prefabricating upper and lower columns and connecting them on-site. This solution is simple to assemble, has a wide range of applications, and can effectively dissipate seismic energy during earthquakes, ensuring minimal deformation or restoration to the initial state after earthquake damage. For specific effects of this self-resetting energy-dissipating box-type connecting column, please refer to the relevant descriptions above, which will not be repeated here.

[0101] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0102] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of protection of the present invention.

Claims

1. A self-resetting energy-dissipating box-type connecting post, characterized in that, include: The structure comprises upper and lower precast columns of reinforced concrete, prestressed high-strength bolts, and energy-dissipating steel plates. Each precast column has a slot at the junction of its outer surface and a steel box fixed within the slot. Embedded steel plates are installed within the concrete on the side and end faces of each precast column near the connection area. The ends of the upper and lower precast columns are joined and connected by prestressed high-strength bolts fixed through the steel boxes. Furthermore, on the outer surface corresponding to the connection area of ​​the embedded steel plates on the side of the column connection, two hollow L-shaped energy-dissipating steel plates are provided. The length of the L-shape is longitudinal. The hollow L-shapes on each side cover the column connection. The two L-shapes in the energy-dissipating steel plates are identical in shape, with one L-shape being obtained by rotating the plane of the other L-shape by 180 degrees.

2. The self-resetting energy-dissipating box-type connecting column according to claim 1, characterized in that, The slot of the upper precast column is located at one-third of the distance from the top of the upper precast column; the slot of the lower precast column is located at one-third of the distance from the bottom of the lower precast column.

3. The self-resetting energy-dissipating box-type connecting column according to claim 1, characterized in that, The steel box inside each precast column is anchored to the concrete of the precast column by U-shaped stirrups embedded in the precast column.

4. The self-resetting energy-dissipating box-type connecting column according to claim 1, characterized in that, Each precast column has pre-drilled holes on its end face, the embedded steel plate on the end face, and the steel box. Each prestressed high-strength bolt passes through the corresponding hole and is fixed to the steel box through which it passes by with a nut.

5. The self-resetting energy-dissipating box-type connecting column according to claim 1, characterized in that, A set of energy-consuming steel plates on opposite sides are of the same height and are connected by tie bolts that penetrate the column; and the tie bolts used to connect the energy-consuming steel plates on adjacent sides are staggered vertically to achieve spatial avoidance.

6. A construction method for a self-resetting energy-dissipating box-type connecting column, characterized in that, include: The upper and lower precast columns are fabricated; each precast column has a groove on its outer surface, a steel box is fixed in the groove, and each precast column has an embedded steel plate on its side and end face near the connection end area. To fix the lower precast column, insert the prestressed high-strength bolt rod into the reserved hole of the lower precast column, and extend it a certain distance out of the steel box and fix it with a nut; The upper precast column is hoisted, and the prestressed high-strength bolt is inserted into the reserved hole of the upper precast column and extended a certain distance out of the steel box and fixed with nuts to form a structural body in which the upper and lower columns fit together. An energy-dissipating steel plate is installed on the outer surface corresponding to the embedded steel plate connection area on the side of the column connection; wherein, the energy-dissipating steel plate on each side includes two hollow L-shaped parts, wherein the length direction of the L-shaped parts is arranged longitudinally; in the energy-dissipating steel plate on each side, the hollow L-shaped parts cover the column connection; the two L-shaped parts in the energy-dissipating steel plate have the same shape, and one of the L-shaped parts is obtained by rotating the plane of the other L-shaped part by 180 degrees.

7. The construction method of the self-resetting energy-dissipating box-type connecting column according to claim 6, characterized in that, The fabrication process for each precast column includes: The precast column is supported by formwork, and a groove is reserved at the junction of the outer surface of the precast column on the model. Embedded steel plates are installed on the sides and end faces of the model near the connection end area; wherein, the embedded steel plates on the end faces have reserved channels; Concrete is poured into the obtained model to obtain a reinforced concrete column structure; wherein, a channel is reserved on the end face of the reinforced concrete column structure and is aligned with the channel reserved in the embedded steel plate on the end face. A steel box is placed in the slot of the reinforced concrete column structure, and the steel box is anchored to the concrete by U-shaped stirrups pre-embedded in the reinforced concrete column structure; wherein, a channel is reserved on the side of the steel box near the connection end, and the reserved channel is aligned with the reserved channel on the end face of the reinforced concrete column structure and the embedded steel plate of the end face; the side of the steel box away from the connection end is welded to the longitudinal reinforcement in the precast column.

8. The construction method of the self-resetting energy-dissipating box-type connecting column according to claim 7, characterized in that, The process of installing an energy-dissipating steel plate on the outer surface corresponding to the embedded steel plate connection area on the side of the column connection includes: The first set of energy-consuming steel plates on the opposite side are set to the same height and connected by tie bolts that penetrate the column. The second set of energy-consuming steel plates on the opposite side is set to the same height, but the height is staggered from the height of the first set of energy-consuming steel plates. The second set of energy-consuming steel plates is connected by tie bolts that pass through the column, so that the tie bolts used by the two sets of energy-consuming steel plates can avoid each other in space.

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