A post-tensioned prestressed assembled beam-column node with an additional damper and a construction method thereof

Abstract

The present invention discloses a post-tensioned prestressed assembled beam-column node with an additional damper in the field of assembled structures and a construction method thereof, comprising a precast concrete column and a first prestressed concrete composite beam and a second prestressed concrete composite beam arranged on both sides of the precast concrete column, the first prestressed concrete composite beam and the second prestressed concrete composite beam are both provided with a rectangular groove at the bottom near one end of the precast concrete column, dampers are respectively provided at the corresponding two rectangular grooves, the first prestressed concrete composite beam and the second prestressed concrete composite beam are provided with a first threaded tube and a second threaded tube nested in each other, the first threaded tube and the second threaded tube are provided with through prestressed tendons, and the two ends of the prestressed tendons are respectively fixed to the outer ends of the corresponding prestressed concrete composite beams by a first prestressed anchor and a second prestressed anchor. The present invention can improve the integrity and ductility performance of the assembled beam-column node and reduce the degree of damage to the structure caused by earthquakes.

Description

Technical Field

[0001] The invention belongs to the technical field of civil engineering assembled structures, and in particular relates to a post-tensioned prestressed assembled beam-column node with an additional damper and a construction method thereof. Background Art

[0002] As a new construction method, prefabricated buildings can greatly reduce the workload of on-site construction, thereby improving construction progress and saving costs. At the same time, they also reduce environmental pollution and the impact on ground transportation and surrounding production and life. They can promote the traditional construction industry from a decentralized and backward handicraft production method to a socialized large-scale industrial production method based on modern technology, which will help achieve the "dual carbon" goal and is the only way for the construction industry to transform and develop. In terms of structural performance, the connection nodes of precast concrete beams and columns are related to the seismic performance of the entire structure. In addition, according to the need to meet the principle of "strong nodes and weak components" according to the seismic requirements, the connection nodes of precast concrete beams and columns are the key to the widespread application and promotion of prefabricated buildings.

[0003] Prestressed concrete beams are widely used in prefabricated beam-column nodes due to their installation advantages. In the prior art, most prefabricated beam-column nodes adopt the method of applying prestress to the prestressed concrete beams separately. Although this method can improve the crack resistance and bearing capacity of the components, it will affect the integrity of the precast concrete beam-column nodes. Prestressed prefabricated concrete nodes have higher deformation recovery ability due to the presence of prestressed tendons, but their energy consumption capacity is relatively weak. Since the plastic hinge of the prefabricated beam-column node at the beam end is closer to the column edge, its ductility performance is poorer than that of cast-in-place nodes. Summary of the invention

[0004] The purpose of the present invention is to provide a post-tensioned prestressed assembled beam-column node with an additional damper and a construction method thereof, which can give full play to the advantages of prefabricated prestressed concrete nodes and improve the integrity and ductility of the assembled beam-column node, thereby reducing the degree of damage to the structure caused by earthquakes.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a post-tensioned prestressed assembled beam-column node with an additional damper, comprising a precast concrete column and a prestressed concrete composite beam, the prestressed concrete composite beam comprising a first prestressed concrete composite beam and a second prestressed concrete composite beam, the first prestressed concrete composite beam and the second prestressed concrete composite beam are respectively arranged on both sides of the precast concrete column, the first prestressed concrete composite beam and the second prestressed concrete composite beam are between the post-cast node core area, the first prestressed concrete composite beam and the second prestressed concrete composite beam are both provided with a rectangular groove at the bottom near one end of the precast concrete column, dampers are respectively provided at the corresponding two rectangular grooves, a first threaded tube is provided in the first prestressed concrete composite beam along its length direction, a second threaded tube is provided in the second prestressed concrete composite beam corresponding to the first threaded tube, the ends of the first threaded tube and the second threaded tube are nested with each other, through prestressed tendons are provided in the first threaded tube and the second threaded tube, and the two ends of the prestressed tendons are respectively fixed to the outer ends of the corresponding prestressed concrete composite beams by first prestressed anchors and second prestressed anchors.

[0006] When the present invention is used, the first prestressed concrete composite beam and the second prestressed concrete composite beam are nested and connected with each other through the pre-buried first threaded tube and the second threaded tube, and the prestressed tendons are passed through the prestressed concrete composite beam and the prestress is applied by the post-tensioning method. Compared with the prior art, the beneficial effects of the present invention are: compared with the post-tensioning method for applying prestress to the prestressed tendons of the beams separately, the integrity of the beam-column node can be greatly improved, and the tensile stress caused by the load can be better offset to avoid structural damage; in addition, the prestressed tendons can be taken out and repaired in time when the structure is damaged; the prestressed concrete composite beam is a special-shaped beam with a rectangular groove at the bottom near the column edge, and a damper is installed at the rectangular groove, which can increase the integrity, ductility and energy consumption capacity of the node, and further improve its seismic performance; in addition, the additional damper can move the plastic hinge of the prefabricated concrete beam outward, meet the seismic principle of "strong column and weak beam", and increase the ductility of the node.

[0007] As a further improvement of the above technical solution, the first prestressed concrete composite beam and the second prestressed concrete composite beam are provided with a plurality of embedded vertical bolts and embedded horizontal bolts in the corresponding rectangular grooves, and the precast concrete column is provided with a plurality of embedded through bolts in the corresponding rectangular grooves on both sides.

[0008] As a further improvement of the above technical solution, the damper includes an inverted "U"-shaped steel plate, the horizontal contact surface of the steel plate and the prestressed concrete composite beam is provided with bolt holes with the same number as the embedded vertical bolts, the vertical contact surface of the steel plate and the prestressed concrete composite beam is provided with bolt straight slots with the same number as the embedded horizontal bolts, and the contact surface of the steel plate and the precast concrete column is provided with bolt holes with the same number as the embedded through bolts.

[0009] As a further improvement of the above technical solution, the thickness of the steel plate on the side corresponding to the precast concrete column is greater than the thickness on the side corresponding to the prestressed concrete composite beam.

[0010] As a further improvement of the above technical solution, the prestressed concrete composite beam includes a prefabricated prestressed beam body and a post-cast composite layer. The prefabricated prestressed beam body is provided with a plurality of open stirrups at equal intervals along its length direction. The open stirrups are opened upward and extend into the post-cast composite layer. Upper stress-bearing steel bars are provided in the post-cast composite layer, and the upper stress-bearing steel bars run through the core area of ​​the post-cast node.

[0011] As a further improvement of the above technical solution, a beam stress-bearing steel bar is arranged at the bottom of the prefabricated prestressed beam body, and a bending portion is arranged on the beam stress-bearing steel bar corresponding to the rectangular groove, and the bending portion extends outward and is anchored to the core area of ​​the post-cast node.

[0012] As a further improvement of the above technical solution, the precast concrete column includes a precast concrete upper column and a precast concrete lower column, a plurality of grouting sleeves are pre-embedded at the bottom of the precast concrete upper column, a plurality of upper column longitudinal bars are arranged in the precast concrete upper column, and the upper column longitudinal bars all extend into corresponding grouting sleeves, a plurality of lower column longitudinal bars are arranged in the precast concrete lower column, and the lower column longitudinal bars all extend outward and extend into corresponding grouting sleeves.

[0013] As a further improvement of the above technical solution, the precast concrete upper column is provided with a plurality of upper column stirrups at equal intervals along its length direction, and the precast concrete lower column is provided with a plurality of lower column stirrups at equal intervals along its length direction.

[0014] The present invention also provides a construction method for a post-tensioned prestressed assembled beam-column node with an additional damper, comprising the following steps:

[0015] Step 1: Prefabricate and process precast concrete columns, prestressed concrete composite beams and dampers in the factory;

[0016] Step 2: hoist and fix the precast concrete lower column, and set up a temporary support frame around the precast concrete lower column;

[0017] Step 3: Fix the damper into the rectangular groove of the prestressed concrete composite beam through the embedded vertical bolts and embedded horizontal bolts on the prestressed concrete composite beam and the external nuts;

[0018] Step 4: hoist the prestressed concrete composite beam and fix it on the temporary support frame. The first prestressed concrete composite beam and the second prestressed concrete composite beam are connected by nesting the extended threaded pipe. At the same time, the prestressed tendons are inserted into the first threaded pipe and the second threaded pipe, and the damper is fixedly connected to the precast concrete lower column by pre-buried through bolts and external nuts.

[0019] Step 5: Close the extended open stirrups and place the upper stress-bearing steel bars, support the formwork and cast the concrete of the post-cast beam superimposed layer and the post-cast core area to form the lower integral structure;

[0020] Step 6: Place a gasket on the top surface of the core area of ​​the post-cast node, hoist the precast concrete upper column, and insert the extended lower column longitudinal reinforcement into the grouting sleeve to connect the precast concrete upper column with the lower integral structure;

[0021] Step 7: The joints formed between the precast concrete upper column and the core area of ​​the post-cast node are sealed with grouting material, and then the joints are filled with grouting material to form a prefabricated beam-column node with an additional damper;

[0022] Step 8: Post-tensioning the prestressed tendons is applied with a post-tensioning method, and fixed to both ends of the prestressed concrete composite beam by means of a first prestressed anchor and a second prestressed anchor, to form a final post-tensioned prestressed assembled beam-column node with an additional damper. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural diagram of a preferred embodiment of the present invention.

[0024] Figure 2 It is a schematic structural diagram of a precast concrete column according to a preferred embodiment of the present invention.

[0025] Figure 3 It is a side view of a precast concrete lower column according to a preferred embodiment of the present invention.

[0026] Figure 4 It is a schematic structural diagram of the first prestressed concrete composite beam according to a preferred embodiment of the present invention.

[0027] Figure 5 It is a schematic structural diagram of the second prestressed concrete composite beam according to the preferred embodiment of the present invention.

[0028] Figure 6 for Figure 4 Cross-sectional views at AA and BB in the middle.

[0029] Figure 7 for Figure 5 Cross-sectional views at CC and DD.

[0030] Figure 8 It is a schematic diagram of the three-dimensional structure of the preferred embodiment 1 of the damper of the present invention.

[0031] Fig. 9 It is a schematic diagram of the three-dimensional structure of the preferred embodiment 2 of the damper of the present invention.

[0032] Among them, 1 precast concrete column, 101 precast concrete upper column, 102 precast concrete lower column, 103 grouting sleeve, 104 upper column longitudinal reinforcement, 105 lower column longitudinal reinforcement, 106 upper column stirrups, 107 lower column stirrups, 2 prestressed concrete composite beams, 201 first prestressed concrete composite beams, 202 second prestressed concrete composite beams, 203 rectangular grooves, 204 precast prestressed beam bodies, 205 post-cast composite layers, 206 open stirrups, 207 upper stress-bearing steel bars, 208 beam stress-bearing steel bars, 3 dampers, 301 bolt holes, 302 straight slots, 4 first threaded pipes, 5 second threaded pipes, 6 prestressed tendons, 7 first prestressed anchors, 8 second prestressed anchors, 9 embedded vertical bolts, 10 embedded horizontal bolts, 11 embedded through bolts, and 12 mortar layers. Implementation

[0033] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0034] like Figure 1-5 As shown, a post-tensioned prestressed assembled beam-column node with an additional damper includes a precast concrete column 1 and a prestressed concrete composite beam 2. The prestressed concrete composite beam 2 includes a first prestressed concrete composite beam 201 and a second prestressed concrete composite beam 202. The first prestressed concrete composite beam 201 and the second prestressed concrete composite beam 202 are respectively arranged on both sides of the precast concrete column 1. The core area of ​​the post-cast node is between the first prestressed concrete composite beam 201 and the second prestressed concrete composite beam 202.

[0035] In this embodiment, the first prestressed concrete composite beam 201 and the second prestressed concrete composite beam 202 both include a precast prestressed beam body 204 and a post-cast composite layer 205. The precast prestressed beam body 204 is provided with a plurality of open stirrups 206 at equal intervals along its length direction. The open stirrups 206 are opened upward and extend into the post-cast composite layer 205. The post-cast composite layer 205 is provided with upper stress-bearing steel bars 207, which penetrate through the core area of ​​the post-cast node. The precast prestressed beam body 204 is provided with beam stress-bearing steel bars 208 at the bottom, and the beam stress-bearing steel bars 208 are provided with a bending portion corresponding to the rectangular groove 203, and the bending portion extends outward and is anchored to the core area of ​​the post-cast node.

[0036] In this embodiment, the precast concrete column 1 includes a precast concrete upper column 101 and a precast concrete lower column 102; the precast concrete upper column 101 is provided with a plurality of upper column stirrups 106 at equal intervals along its length direction, and the precast concrete lower column 102 is provided with a plurality of lower column stirrups 107 at equal intervals along its length direction; a plurality of grouting sleeves 103 are pre-buried at the bottom of the precast concrete upper column 101, a plurality of upper column longitudinal bars 104 are provided in the precast concrete upper column 101, and the upper column longitudinal bars 104 are all extended into the corresponding grouting sleeves 103, a plurality of lower column longitudinal bars 105 are provided in the precast concrete lower column 102, and the lower column longitudinal bars 105 are all extended outward and extended into the corresponding grouting sleeves 103, and the precast concrete upper column 101 is connected to the precast concrete lower column 102 through the grouting sleeves 103; the precast concrete upper column 101 is connected to the post-cast core area through the grouting layer 12 and the grouting material.

[0037] In this embodiment, the bottom of the first prestressed concrete composite beam 201 and the second prestressed concrete composite beam 202 near one end of the precast concrete column 1 are both provided with a rectangular groove 203, and dampers 3 are respectively provided at the corresponding two rectangular grooves 203. Most dampers 3 in the prior art are placed in the upper part, the middle part or the lower part of the beam. Placing them in the upper part of the beam will affect the layout of the floor slab, while placing them in the lower part of the beam will directly affect the floor height. Considering that it does not affect the structure of the building, placing them in the middle part of the beam will affect the arm of the damper 3. The present invention chooses to groove the lower part of the beam and place the damper 3 in the groove, which ensures the arm of the damper 3, the energy dissipation effect and the bearing capacity of the damper 3, and will not affect the function of the building.

[0038] In this embodiment, a first threaded tube 4 is arranged in the first prestressed concrete composite beam 201 along its length direction, and a second threaded tube 5 is arranged in the second prestressed concrete composite beam 202 corresponding to the first threaded tube 4. Preferably, the diameter of the second threaded tube 5 is larger than the diameter of the first threaded tube 4. The first prestressed concrete composite beam 201 and the second prestressed concrete composite beam 202 are connected together by nesting the two threaded tube ends with each other; through prestressed tendons 6 are arranged in the first threaded tube 4 and the second threaded tube 5, and the two ends of the prestressed tendons 6 are fixed to the outer ends of the corresponding prestressed concrete composite beam 2 by a first prestressed anchor 7 and a second prestressed anchor 8 respectively. By adopting the through prestressed tendons 6 and applying post-tensioning prestress, the beams and columns are connected by crimping to form a whole, and the overall performance of the beam-column node is improved. In addition, after adopting prestressing, the structure can be applied to public building structures with large spans, and the deformation recovery ability of the structure can be enhanced. In addition, ordinary stress-bearing steel bars and prestressed steel strands are used in this node, which can play a double protection role. When a natural disaster occurs, the structural force is first borne by ordinary steel bars. The strength of the prestressed tendons 6 is relatively high. When the strength of the ordinary steel bars reaches the limit, the steel strands can continue to bear the load, which plays a secondary protection role. If the steel strands are further damaged by the earthquake, the through-nested threaded pipes can play the next layer of protection role, ensuring the integrity of the node, thereby avoiding a collapse of the overall structure and reducing the losses caused by natural disasters.

[0039] like Figure 6 and Figure 7 As shown, the first prestressed concrete composite beam 201 and the second prestressed concrete composite beam 202 are provided with a plurality of embedded vertical bolts 9 and embedded horizontal bolts 10 in the corresponding rectangular grooves 203, and the precast concrete column 1 is provided with a plurality of embedded through bolts 11 in the corresponding rectangular grooves 203 on both sides, so as to facilitate the installation of the damper 3.

[0040] Figure 8This is the first embodiment of the damper 3 of the present invention. The damper 3 includes an inverted "U"-shaped steel plate. The horizontal contact surface between the steel plate and the prestressed concrete composite beam 2 is provided with bolt holes 301 of the same number as the embedded vertical bolts 9. The vertical contact surface between the steel plate and the prestressed concrete composite beam 2 is provided with bolt straight slots 302 of the same number as the embedded horizontal bolts 10. The contact surface between the steel plate and the precast concrete column 1 is provided with bolt holes 301 of the same number as the embedded through bolts 11. The three sides of the damper 3 are connected to the beam-column surface by embedded bolts, which can ensure that the beam-column node and the steel plate can deform at the same time. The bolt straight slots 302 of the damper 3 are connected to the embedded horizontal bolts 10, which is not only more convenient when installing the damper 3, but also can move upward under the action of external force, thereby enhancing the ability of the damper 3 to deform together with the beam body. When an earthquake occurs, the damper 3 can consume earthquake energy and effectively improve the energy consumption capacity of the assembled node.

[0041] Fig. 9 This is the second embodiment of the damper 3 of the present invention. On the basis of the first embodiment, the thickness of the steel plate corresponding to the precast concrete column 1 is designed to be greater than the thickness on the corresponding prestressed concrete composite beam 2. By thickening the steel plate close to the column end to serve as a "calf", safety accidents can be avoided at the beam-column node after failure.

[0042] The present invention also provides a construction method for a post-tensioned prestressed assembled beam-column node with an additional damper 3, comprising the following steps:

[0043] Step 1: prefabricate the first prestressed concrete composite beam 201, the second prestressed concrete composite beam 202, the precast concrete upper column 101, the precast concrete lower column 102 and the damper 3 in a factory;

[0044] Step 2: hoist the precast concrete lower column 102 to the designed position and fix it, and set a temporary support frame around the precast concrete lower column 102;

[0045] Step 3: Align the bolt straight slot 302 of the damper 3 with the embedded horizontal bolt 10, then move the damper 3 upward until the embedded vertical bolt 9 passes through the bolt hole 301 of the damper 3, and after ensuring that the damper 3 is in close contact with the prefabricated prestressed beam body 204, tighten the fixing nut;

[0046] Step 4: hoist the first prestressed concrete composite beam 201 and the second prestressed concrete composite beam 202 assembled with the damper 3 onto the temporary support frame, connect the first prestressed concrete composite beam 201 and the second prestressed concrete composite beam 202 by inserting the first threaded tube 4 into the second threaded tube 5, and tighten the fixing nuts after ensuring that the bolt holes 301 of the two dampers 3 are aligned with the embedded through bolts 11, and then insert the through prestressed tendons 6 into the first threaded tube 4 and the second threaded tube 5;

[0047] Step 5: Close the extended open stirrups 206 and place the upper stress-bearing steel bars 207, and cast the post-cast beam superimposed layer and the post-cast core area with formwork to form the lower integral structure;

[0048] Step 6: hoist the precast concrete upper column 101, align the extended lower column longitudinal reinforcement 105 with the grouting sleeve 103 for connection, calculate the joint height between the precast concrete upper column 101 and the core area of ​​the post-cast node, and place the gasket;

[0049] Step 7: The joints formed between the precast concrete upper column 101 and the core area of ​​the post-cast node are sealed to form a grouting layer 12, and the grouting sleeve 103 is grouted after reaching the required strength;

[0050] Step eight: Use the post-tensioning method to apply post-tensioning stress to the prestressed tendons 6 and fix the prestressed tendons 6 to the two ends of the prestressed concrete composite beam 2 through the first prestressed anchor 7 and the second prestressed anchor 8 to form the final post-tensioned prestressed assembled beam-column node with an additional damper 3.

[0051] When the present invention is in use, a post-tensioned prestressed assembled beam-column node is formed by the precast concrete upper column 101, the precast concrete lower column 102, the first prestressed concrete composite beam 201 and the second prestressed concrete composite beam 202. This design can give full play to the role of prestress and prolong the time of concrete cracking. At the same time, two dampers 3 are installed at the node of the precast concrete lower column 102 and the prestressed concrete composite beam 2 to form a post-tensioned prestressed assembled beam-column node with additional dampers 3, which can improve the ductility of the node to ensure the overall seismic performance. The energy dissipation performance and ductility performance of the node are mainly achieved through the opening-closing swing mechanism of the beam-column node. Since the opening size of the beam-column node can directly affect the energy dissipation effect, but the stability requirement of the node makes the opening of the node not too large, a damper 3 is set to achieve greater energy dissipation and increase the ductility of the node; the steel plate connected to the vertical beam surface is provided with a bolt straight slot 302, which is not only convenient for installation, but also allows the steel plate to move slightly downward when the beam-column node opens, ensuring that the size of the opening is increased under the premise of safety; at the same time, a "U"-shaped damper 3 is set at the bottom of the beam to move the plastic hinge of the beam-column node outward, avoid brittle failure at the contact surface of the beam-column node, and increase the ductility and energy dissipation performance of the beam-column node; there is no bonding force between the prestressed tendons 6 and the prestressed concrete composite beam 2, and they can slide relatively, have self-reset and repairability, can offset the tensile stress caused by the load to avoid structural damage, and can also be repaired in time when damaged, and can better maintain the integrity of the beam-column node structure during an earthquake. The advantages of the present invention are that it can not only improve the seismic resistance of the assembled beam-column node, realize the effective connection and effective energy consumption of the node, have the integrity similar to cast-in-place, and meet the principle of "strong node and weak member" in seismic design, but also the plastic hinge can be moved outward through the damper 3 and the precast concrete prestressed beam, thereby increasing the ductility performance of the entire node.

[0052] The present invention is not limited to the above-mentioned embodiments. On the basis of the technical solution disclosed in the present invention, technicians in this field can make some substitutions and deformations to some technical features therein according to the disclosed technical content without creative labor, and these substitutions and deformations are all within the protection scope of the present invention.

Claims

1. A post-tensioned prestressed assembled beam-column node with an additional damper, comprising a precast concrete column and a prestressed concrete composite beam, characterized in that: The prestressed concrete composite beam comprises a first prestressed concrete composite beam and a second prestressed concrete composite beam, the first prestressed concrete composite beam and the second prestressed concrete composite beam are respectively arranged on both sides of the precast concrete column, the first prestressed concrete composite beam and the second prestressed concrete composite beam are between the post-cast node core area, the first prestressed concrete composite beam and the second prestressed concrete composite beam are both provided with a rectangular groove at the bottom near one end of the precast concrete column, and dampers are respectively provided at the corresponding two rectangular grooves, a first threaded tube is provided in the first prestressed concrete composite beam along its length direction, a second threaded tube is provided in the second prestressed concrete composite beam corresponding to the first threaded tube, the ends of the first threaded tube and the second threaded tube are nested with each other, and through prestressed tendons are provided in the first threaded tube and the second threaded tube, and the two ends of the prestressed tendons are respectively fixed to the outer ends of the corresponding prestressed concrete composite beams through the first prestressed anchor and the second prestressed anchor; The first prestressed concrete composite beam and the second prestressed concrete composite beam are both provided with a plurality of embedded vertical bolts and embedded horizontal bolts in the corresponding rectangular grooves, and the rectangular grooves on both sides of the precast concrete column are provided with a plurality of embedded through bolts; The damper comprises an inverted "U"-shaped steel plate, the horizontal contact surface of the steel plate and the prestressed concrete composite beam is provided with bolt holes having the same number as the embedded vertical bolts, the vertical contact surface of the steel plate and the prestressed concrete composite beam is provided with bolt straight slots having the same number as the embedded horizontal bolts, and the contact surface of the steel plate and the precast concrete column is provided with bolt holes having the same number as the embedded through bolts.

2. A post-tensioned prestressed assembled beam-column node with an additional damper according to claim 1, characterized in that: The thickness of the steel plate on the side corresponding to the precast concrete column is greater than the thickness on the side corresponding to the prestressed concrete composite beam.

3. A post-tensioned prestressed assembled beam-column node with an additional damper according to claim 1, characterized in that: The prestressed concrete composite beam comprises a prefabricated prestressed beam body and a post-cast composite layer. The prefabricated prestressed beam body is provided with a plurality of open stirrups at equal intervals along its length direction. The open stirrups are opened upward and extend into the post-cast composite layer. Upper stress-bearing steel bars are provided in the post-cast composite layer, and the upper stress-bearing steel bars penetrate through the core area of ​​the post-cast node.

4. A post-tensioned prestressed assembled beam-column node with an additional damper according to claim 3, characterized in that: The bottom of the prefabricated prestressed beam body is provided with beam stress-bearing steel bars, and the beam stress-bearing steel bars are provided with bending parts corresponding to the rectangular grooves, and the bending parts extend outwards and are anchored to the core area of ​​the post-cast node.

5. A post-tensioned prestressed assembled beam-column node with an additional damper according to any one of claims 1 to 4, characterized in that: The precast concrete column comprises a precast concrete upper column and a precast concrete lower column. A plurality of grouting sleeves are pre-buried at the bottom of the precast concrete upper column. A plurality of upper column longitudinal bars are arranged in the precast concrete upper column. The upper column longitudinal bars extend into corresponding grouting sleeves. A plurality of lower column longitudinal bars are arranged in the precast concrete lower column. The lower column longitudinal bars extend outwards and extend into corresponding grouting sleeves.

6. A post-tensioned prestressed assembled beam-column node with an additional damper according to claim 5, characterized in that: The precast concrete upper column is provided with a plurality of upper column stirrups at equal intervals along its length direction, and the precast concrete lower column is provided with a plurality of lower column stirrups at equal intervals along its length direction.

7. A construction method for a post-tensioned prestressed assembled beam-column node with an additional damper according to claim 6, characterized in that: The following steps are involved: Step 1: Prefabricate and process precast concrete columns, prestressed concrete composite beams and dampers in the factory; Step 2: hoist and fix the precast concrete lower column, and set up a temporary support frame around the precast concrete lower column; Step 3: Fix the damper into the rectangular groove of the prestressed concrete composite beam through the embedded vertical bolts and embedded horizontal bolts on the prestressed concrete composite beam and the external nuts; Step 4: hoist the prestressed concrete composite beam and fix it on the temporary support frame. The first prestressed concrete composite beam and the second prestressed concrete composite beam are connected by nesting the extended threaded pipe. At the same time, the prestressed tendons are inserted into the first threaded pipe and the second threaded pipe, and the damper is fixedly connected to the precast concrete lower column by pre-buried through bolts and external nuts. Step 5: Close the extended open stirrups and place the upper stress-bearing steel bars, support the formwork and cast the concrete of the post-cast beam superimposed layer and the post-cast core area to form the lower integral structure; Step 6: Place a gasket on the top surface of the core area of ​​the post-cast node, hoist the precast concrete upper column, and insert the extended lower column longitudinal reinforcement into the grouting sleeve to connect the precast concrete upper column with the lower integral structure; Step 7: The joints formed between the precast concrete upper column and the core area of ​​the post-cast node are sealed with grouting material, and then the joints are filled with grouting material to form a prefabricated beam-column node with an additional damper; Step 8: Post-tensioning the prestressed tendons is applied with a post-tensioning method, and fixed to both ends of the prestressed concrete composite beam by means of a first prestressed anchor and a second prestressed anchor, to form a final post-tensioned prestressed assembled beam-column node with an additional damper.

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