Connecting joint of PVC-FRP pipe reinforced concrete composite column and prestressed reinforced concrete beam

Abstract

The invention discloses a connection node of a PVC-FRP pipe reinforced concrete composite column and a prestressed reinforced concrete beam. The connection node comprises the composite column, the prestressed reinforced concrete beam and a node area, the joint area comprises a metal connecting frame and prestressed steel bars, the composite column penetrates through the metal connecting frame, column concrete on the outer side of the PVC-FRP pipe is fixedly connected to the inner side wall of the metal connecting frame in a supported mode, the two opposite ends of the metal connecting frame are provided with enclosing parts, and the enclosing parts are arranged in the column concrete on the outer side of the PVC-FRP pipe and arranged on the peripheral wall of the PVC-FRP pipe in an enclosing mode. The prestressed reinforced concrete beam is connected to the outer side of the metal connecting frame and forms an angle with the composite column; the prestressed reinforcement penetrates through the metal connecting frame to be connected with two adjacent end faces of the composite column and the prestressed reinforced concrete beam respectively, one end of the prestressed reinforcement is connected with the composite column, and the other end of the prestressed reinforcement is connected with the prestressed reinforced concrete beam. The connecting joint is high in bearing capacity, good in ductility and durability, convenient to construct and high in integrity.

Description

Technical Field

[0001] The present invention relates to the technical field of civil engineering, and in particular to a connection node between a PVC-FRP tube reinforced concrete composite column and a prestressed reinforced concrete beam. Background Technique

[0002] The PVC-FRP tube reinforced concrete composite column is a new type of composite structure. A circular PVC-FRP tube reinforced concrete core column (hereinafter referred to as the core column) is arranged inside it. The PVC-FRP tube is prefabricated by winding FRP strips around a PVC tube at a certain interval. Reinforcing bars are arranged inside and outside the PVC-FRP tube, and concrete is poured to form a PVC-FRP tube reinforced concrete composite column. Compared with ordinary reinforced concrete columns, the PVC-FRP tube concrete composite column can give full play to the high bearing capacity of the core column. At the same time, the composite stirrups outside the core column can play a role in restraining and protecting the core column, significantly improving the bearing capacity, stiffness and durability of the composite column.

[0003] The connection between the PVC-FRP tube reinforced concrete composite column and beam and slab members is one of the key problems restricting the practical application of the PVC-FRP tube reinforced concrete composite column. The bearing capacity of the PVC-FRP tube reinforced concrete composite column is much higher than that of an ordinary reinforced concrete column with the same cross-sectional size. If the connection method of an ordinary reinforced concrete column and a prestressed reinforced concrete beam is adopted for the PVC-FRP tube reinforced concrete composite column node, it will cause the node to become a weak position, which does not conform to the design principle of "strong node, weak member". Therefore, there is an urgent need to propose a connection node between a PVC-FRP tube reinforced concrete composite column and a prestressed reinforced concrete beam that is safe and reliable, has good overall performance, clear force transmission and convenient construction. Summary of the Invention

[0004] The purpose of the present invention is to provide a connection node between a PVC-FRP tube reinforced concrete composite column and a prestressed reinforced concrete beam to solve the problems existing in the above-mentioned prior art. The connection node has high bearing capacity, good ductility and durability, convenient construction and strong integrity.

[0005] To achieve the above purpose, the present invention provides the following solution:

[0006] The present invention provides a connection node between a PVC-FRP tube reinforced concrete composite column and a prestressed reinforced concrete beam, comprising a composite column, a prestressed reinforced concrete beam and a node area; the composite column comprises a PVC-FRP tube and an inner steel skeleton and an outer composite steel skeleton respectively arranged on the inner side and the outer side of the PVC-FRP tube, column concrete is arranged on the inner side and the outer side of the PVC-FRP tube, the inner steel skeleton and the outer composite steel skeleton are arranged in the column concrete; the prestressed reinforced concrete beam is arranged on one side of the composite column; the node area comprises a metal connection frame and prestressed steel bars, the composite column is passed through the metal connection frame, and the outer composite steel skeleton is arranged on the outer side of the PVC-FRP tube. The column concrete can be fixedly supported on the inner wall of the metal connection frame, and the two opposite ends of the metal connection frame have enclosures, the enclosures are placed in the column concrete outside the PVC-FRP tube, and the enclosures can be fixedly surrounded by the outer peripheral wall of the PVC-FRP tube; the prestressed reinforced concrete beam is fixedly connected to the outside of the metal connection frame and is set at an angle to the composite column; the prestressed steel bar passes through two adjacent end faces of the metal connection frame respectively connected to the composite column and the prestressed reinforced concrete beam, and one end of the prestressed steel bar is fixedly connected to the composite column, and the other end is fixedly connected to the prestressed reinforced concrete beam.

[0007] Preferably, one end of the prestressed steel bar is fixedly embedded in the composite column, and the other end passes through the prestressed reinforced concrete beam, and an anchor is fixedly provided at the position where the prestressed steel bar passes through the prestressed reinforced concrete beam.

[0008] Preferably, the composite columns and the prestressed reinforced concrete beams are arranged in a cross shape, and a plurality of prestressed steel bars are symmetrically arranged in the composite columns on both sides of the node area, and the plurality of prestressed steel bars connected to the composite columns on the same side cross in the node area, and the ends of the plurality of prestressed steel bars facing away from the composite columns on the corresponding sides are respectively fixedly connected to the prestressed reinforced concrete beams on both sides of the node area.

[0009] Preferably, the metal connecting frame includes two connecting steel plates arranged opposite to each other, and the outer sides of the two connecting steel plates can be fixedly connected to the prestressed reinforced concrete beam; the enclosure at one end of the metal connecting frame includes two semi-arc steel plates, and the two sides are fixedly connected to the two connecting steel plates through a plurality of stiffening plates, and a plurality of stiffening plates on one side are arranged side by side at equal intervals; the two semi-arc steel plates are fixedly arranged around the outer peripheral wall of the PVC-FRP pipe and can be fixedly connected by prestressed bolts.

[0010] Preferably, the metal connection frame further includes anchoring steel plates fixedly arranged on the outer sides of the two connection steel plates. The two anchoring steel plates are fixedly connected to the corresponding connection steel plates and between the two anchoring steel plates through prestressed bolts; the prestressed steel bars can be fixedly passed through the connection steel plates and the anchoring steel plates; beam connection parts capable of being fixedly passed through the inside of the prestressed reinforced concrete beam are fixedly arranged on the outer sides of the two anchoring steel plates.

[0011] Preferably, the enclosing part at the other end of the metal connection frame includes two semi-circular end plates. The two semi-circular end plates are respectively fixedly connected to the two anchoring steel plates, and the two semi-circular end plates are fixedly arranged around the outer peripheral wall of the PVC-FRP pipe and can be fixedly connected through prestressed bolts; the outer composite steel bar skeleton is fixedly passed through the two semi-circular end plates.

[0012] Preferably, the PVC-FRP pipe includes a PVC pipe and FRP bands sleeved on the outer periphery of the PVC pipe at intervals along the axial direction; the thickness of the semi-circular steel plate is equal to the thickness of the PVC pipe, the thickness of the stiffening plate is equal to twice the thickness of the PVC pipe, and the width of the semi-circular steel plate is equal to the distance between adjacent FRP bands of the PVC pipe.

[0013] Preferably, the inner steel bar skeleton includes a plurality of inner longitudinal bars distributed circumferentially and a plurality of inner stirrups distributed axially. The inner stirrups are circumferentially tightened around the plurality of inner longitudinal bars.

[0014] Preferably, the outer composite steel bar skeleton includes a plurality of outer longitudinal bars distributed circumferentially and a plurality of outer stirrups distributed axially. The outer stirrups are circumferentially tightened around the plurality of outer longitudinal bars.

[0015] Preferably, the prestressed reinforced concrete beam includes beam concrete, a plurality of beam longitudinal bars distributed circumferentially in the beam concrete, and a plurality of beam stirrups distributed axially in the beam concrete. The beam stirrups are circumferentially tightened around the plurality of beam longitudinal bars.

[0016] The present invention has achieved the following technical effects compared with the prior art:

[0017] The metal connection frame and prestressed steel bars connected to both the laminated column and the prestressed reinforced concrete beam are set in the joint area, which improves the joint stiffness and the anti-deformation ability, and realizes the seismic criterion of "strong joints, weak components"; the prestressed steel bars pass through the joint area to connect the laminated column and the prestressed reinforced concrete beam, and the forces borne by the prestressed reinforced concrete beam can be transmitted to the joint area through the metal connection frame and the prestressed steel bars. The laminated column passes through the joint area and is enclosed and fixed by the enclosing part. The force transmission path of the joint is clear, which is convenient for the load transfer between the joint area and the column, and can effectively improve the flexural and shear bearing capacities of the joint; among them, the PVC-FRP pipe of the laminated column can be used as the core column formwork. The components required in the joint area, the internal steel bar skeleton, the external composite steel bar skeleton, etc. can be prefabricated in the processing factory, and only need to be installed on site and poured with retarder concrete, which speeds up the installation progress. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 The front view of the joint area provided in Embodiment 1;

[0020] Figure 2 The top view of the connection between the semi-circular steel plate and the connecting steel plate in Embodiment 1;

[0021] Figure 3 The side view of the semi-circular end plate in Embodiment 1;

[0022] Figure 4 The top view of the joint area of the connection joint between the PVC-FRP pipe reinforced concrete laminated column and the prestressed reinforced concrete beam provided in Embodiment 1;

[0023] Figure 5 The front view schematic diagram of the connection joint between the PVC-FRP pipe reinforced concrete laminated column and the prestressed reinforced concrete beam provided in Embodiment 1.

[0024] In the figure: 1 - Composite column; 11 - PVC - FRP tube; 111 - PVC tube; 112 - FRP strip; 12 - Inner steel bar skeleton; 121 - Inner longitudinal steel bar; 122 - Inner stirrup; 13 - Outer composite steel bar skeleton; 131 - Outer longitudinal steel bar; 132 - Outer stirrup; 14 - Column concrete; 2 - Prestressed reinforced concrete beam; 21 - Beam concrete; 22 - Beam longitudinal steel bar; 23 - Beam stirrup; 3 - Joint area; 31 - Metal connection frame; 311 - Connection steel plate; 312 - Semi - arc steel plate; 313 - Stiffening plate; 314 - Prestressed bolt; 315 - Anchor steel plate; 316 - Semi - arc steel plate; 317 - Beam connection part; 32 - Prestressed steel bar; 33 - Anchor. Specific embodiments

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

[0026] The purpose of the present invention is to provide a connection joint between a PVC - FRP tube reinforced concrete composite column and a prestressed reinforced concrete beam to solve the problems existing in the above - mentioned prior art. The connection joint has high bearing capacity, good ductility and durability, convenient construction, and strong integrity.

[0027] To make the above - mentioned objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Embodiment 1

[0029] This embodiment provides a connection joint between a PVC - FRP tube reinforced concrete composite column and a prestressed reinforced concrete beam. Please refer to Figure 4 and Figure 5, including a composite column 1, a prestressed reinforced concrete beam 2 and a joint area 3; the composite column 1 includes a PVC-FRP tube 11, an inner steel bar framework 12 and an outer composite steel bar framework 13 which are respectively arranged inside and outside the PVC-FRP tube 11. Column concrete 14 is arranged on both the inner side and the outer side of the PVC-FRP tube 11, and the inner steel bar framework 12 and the outer composite steel bar framework 13 are arranged in the column concrete 14; the prestressed reinforced concrete beam 2 is arranged on one side of the composite column 1; the joint area 3 includes a metal connection frame 31 and prestressed steel bars 32. The composite column 1 passes through the metal connection frame 31, and the column concrete 14 outside the PVC-FRP tube 11 can be fixedly braced against the inner side wall of the metal connection frame 31. And the opposite sides of the metal connection frame 31 both have enclosing parts which are all placed in the column concrete 14 outside the PVC-FRP tube 11 and can fixedly enclose the outer peripheral wall of the PVC-FRP tube 11; the prestressed reinforced concrete beam 2 is fixedly connected to the outside of the metal connection frame 31 and is arranged at an angle with the composite column 1; the prestressed steel bars 32 pass through two adjacent end faces of the metal connection frame 31 which are respectively connected to the composite column 1 and the prestressed reinforced concrete beam 2, and one end of the prestressed steel bar 32 is fixedly connected to the composite column 1 and the other end is fixedly connected to the prestressed reinforced concrete beam 2.

[0030] The joint area 3 is provided with a metal connection frame 31 and prestressed steel bars 32 which are both connected to the composite column 1 and the prestressed reinforced concrete beam 2, improving the joint stiffness and the anti-deformation ability and realizing the seismic criterion of "strong joints, weak members"; the prestressed steel bars 32 penetrate through the joint area 3 to connect the composite column 1 and the prestressed reinforced concrete beam 2. The force received by the prestressed reinforced concrete beam 2 can be transmitted to the joint area through the metal connection frame 31 and the prestressed steel bars 32. The composite column 1 penetrates through the joint area 3 and is fixedly enclosed through the enclosing parts. The force transmission path of the joint is clear, facilitating the load transmission between the joint area and the column and effectively improving the flexural and shear bearing capacities of the joint; among them, the PVC-FRP tube 11 of the composite column 1 can be used as a core column formwork. The components required in the joint area, the inner steel bar framework 12, the outer composite steel bar framework 13, etc. can be prefabricated in a processing factory, and only need to be installed on site and the retarder concrete is poured, accelerating the installation progress.

[0031] In an alternative embodiment of the present embodiment, preferably, one end of the prestressed steel bar 32 is fixedly embedded in the composite column 1, and the other end penetrates out of the prestressed reinforced concrete beam 2. And an anchor 33 is fixedly arranged at the position where the prestressed steel bar 32 penetrates out of the prestressed reinforced concrete beam 2. Specifically, an M15-N anchor can be used for fixation, so that the prestressed reinforced concrete beam 2 has better integrity with the joint area 3 and the composite column 1, and the force transmission performance and the cooperative work are better.

[0032] In an alternative embodiment of the present embodiment, preferably, please refer to Figure 1 and Figure 5The composite column 1 and the prestressed reinforced concrete beam 2 are arranged in a cross shape, and multiple prestressed steel bars 32 are symmetrically arranged in the composite columns 1 on both sides of the node area 3. The multiple prestressed steel bars 32 connected to the composite column 1 on the same side cross in the node area 3, and the ends of the multiple prestressed steel bars 32 away from the corresponding side composite column 1 are respectively fixedly connected to the prestressed reinforced concrete beams 2 on both sides of the node area 3. The prestressed steel bars 32 can be set as steel bars. The symmetrically arranged multiple prestressed steel bars 32 have good integrity with the node area 3 and the composite column 1, and the prestressed steel bars 32 are consistent with the direction of the principal stress of the connection node, can bear more node loads, and improve the shear bearing capacity and ductility of the node.

[0033] In addition, the cross-section of the composite column 1 can be an outer square and inner circle or an outer circle and inner circle. The composite column 1 and the prestressed reinforced concrete beam 2 can also be arranged in a T-shape or an L-shape as needed. When the composite column 1 is connected to the prestressed reinforced concrete beam 2 with a one-way through node, it is a T-shaped node; when the composite column 1 is connected to the prestressed reinforced concrete beam 2 with a one-way non-through node, it is an L-shaped node.

[0034] Among the optional solutions of this embodiment, it is more preferred to refer to Figure 1 and Figure 2 The metal connection frame 31 includes two connecting steel plates 311 arranged opposite to each other, and the outer sides of the two connecting steel plates 311 can be fixedly connected to the prestressed reinforced concrete beam 2; the enclosure at one end of the metal connection frame 31 includes two semi-arc steel plates 312, and the two sides are fixedly connected to the two connecting steel plates 311 through multiple stiffening plates 313, and multiple stiffening plates 313 are arranged side by side at equal intervals on one side; the two semi-arc steel plates 312 are fixedly arranged around the outer peripheral wall of the PVC-FRP pipe 11 and can be fixedly connected by prestressed bolts 314; by setting two semi-arc steel plates 312, the PVC-FRP pipe 11 is enclosed and fixed by prestressed bolts 314, and the semi-arc steel plates 312 are fixed to the connecting steel plates 311 through stiffening plates 313, which effectively improves the bending and shear bearing capacity of the node area 3; and the connecting steel plates 311 and the stiffening plates 313 are connected by welds, which reduces the risk of the steel section failing to be in place due to construction errors such as inclination or misalignment of the composite column due to the full bolt connection, reduces the accuracy sensitivity, and speeds up the installation progress.

[0035] In the optional scheme of this embodiment, it is more preferred that the metal connection frame 31 also includes an anchoring steel plate 315 fixedly arranged on the outside of the two connecting steel plates 311, and the two anchoring steel plates 315 are fixedly connected to the corresponding connecting steel plates 311 and the two anchoring steel plates 315 by prestressed bolts 314, so as to improve the integrity and facilitate on-site positioning and installation; the prestressed steel bars 32 can be fixedly penetrated in the connecting steel plates 311 and the anchoring steel plates 315; the two anchoring steel plates 315 are fixedly provided with a beam connecting portion 317 fixedly penetrated inside the prestressed reinforced concrete beam 2 on the outside, and bolts are arranged around the beam connecting portion 317 to improve the connection stability with the prestressed reinforced concrete beam 2; wherein the prestressed steel bars 32 pass through the reserved holes on the connecting steel plates 311, the anchoring steel plates 315 and the prestressed reinforced concrete beam 2 and are anchored and fixed by the M15-N anchor 10, and then the reserved holes are grouted, and the strength of the concrete used is not lower than the strength of the beam concrete 21 of the prestressed reinforced concrete beam 2.

[0036] Among the optional solutions of this embodiment, it is more preferred to refer to Figure 1 and Figure 3 The enclosure at the other end of the metal connection frame 31 includes two semi-arc end plates 316, which are respectively fixedly connected to two anchoring steel plates 315. The two semi-arc end plates 316 are fixedly arranged around the outer wall of the PVC-FRP pipe 11 and can be fixedly connected by prestressed bolts 314; the outer composite steel frame 13 is fixedly penetrated by the two semi-arc end plates 316, and the PVC-FRP pipe 11 is further enclosed and fixed by the two semi-arc end plates 316, thereby improving the integrity and effectively improving the bending and shear bearing capacity of the node area 3.

[0037] Among them, the prestressed bolts 314 at various locations are made of high-strength bolts, and the prestress is applied by a through-type hydraulic jack during installation, so that the constraint effect on the node area 3 is enhanced.

[0038] In the optional scheme of this embodiment, it is more preferred that the PVC-FRP pipe 11 includes a PVC pipe 111 and an FRP belt 112 axially spaced on the outer periphery of the PVC pipe 111; adding a stiffening plate 313 can improve the integrity of the connecting steel plate 311 and the semi-arc steel plate 312, and increase the overall height of the node area 3. In order to ensure the overall strength, the specific dimensional relationship is as follows: the thickness of the semi-arc steel plate 312 is equal to the thickness of the PVC pipe 111, the thickness of the stiffening plate 313 is equal to twice the thickness of the PVC pipe 111, and the width of the semi-arc steel plate 312 is equal to the spacing between adjacent FRP belts 112 of the PVC pipe 111.

[0039] Among them, the FRP material can be selected from CFRP carbon fiber reinforced composite materials or AFRP aramid fiber reinforced composite materials.

[0040] In an alternative embodiment of the present example, preferably, the inner steel bar framework 12 includes a plurality of inner longitudinal bars 121 distributed circumferentially and a plurality of inner stirrups 122 distributed axially. The inner stirrups 122 are circumferentially tightened around the plurality of inner longitudinal bars 121 to ensure the strength of the inner steel bar framework 12.

[0041] In an alternative embodiment of the present example, preferably, the outer composite steel bar framework 13 includes a plurality of outer longitudinal bars 131 distributed circumferentially and a plurality of outer stirrups 132 distributed axially. The outer stirrups 132 are circumferentially tightened around the plurality of outer longitudinal bars 131, and the outer longitudinal bars 131 can penetrate through the preset through holes on the semi-circular end plates 316 to further improve the overall strength.

[0042] In an alternative embodiment of the present example, preferably, the prestressed reinforced concrete beam 2 includes beam concrete 21, a plurality of beam longitudinal bars 22 distributed circumferentially in the beam concrete 21, and a plurality of beam stirrups 23 distributed axially in the beam concrete 21. The beam stirrups 23 are circumferentially tightened around the plurality of beam longitudinal bars 22 to improve the overall strength of the prestressed reinforced concrete beam 2.

[0043] The specific implementation steps of the connection node between the PVC-FRP tube reinforced concrete composite column and the prestressed reinforced concrete beam provided in this embodiment are as follows:

[0044] First, wind the fiber-reinforced composite material (FRP) strips impregnated with epoxy resin glue around the PVC tube 111 at a certain interval. During the winding process, the FRP strip 112 needs to be tightened to ensure close contact between the FRP and the PVC tube. The width, interval, and number of layers of the FRP strips can be calculated and determined according to the design value of the column bearing capacity; cure the PVC-FRP tube at room temperature until the epoxy resin glue solidifies to form the PVC-FRP tube 11.

[0045] Fabricate the semi-circular steel plate 312, stiffening plate 313, connecting steel plate 311, semi-circular end plate 316, anchoring steel plate 315, and prestressed reinforced concrete beam 2 in a steel structure processing factory. First, bind the inner longitudinal reinforcement 121 and inner stirrups 122 into the internal steel bar skeleton 12, and sleeve the PVC-FRP pipe 11 outside the internal steel bar skeleton 12. Secondly, determine the position of the joint section, set the semi-circular steel plate 312 in the PVC-FRP pipe 11 section corresponding to the joint area 3, weld the stiffening plate 313 around the outer wall of the semi-circular steel plate 312, connect the semi-circular steel plates 312 with prestressed bolts 314, and connect the stiffening plate 313 and the connecting steel plate 311 by welding; both the connecting steel plate 311 and the anchoring steel plate 315, and the semi-circular steel plate 312 and the anchoring steel plate 315 are connected by prestressed bolts 314. On this basis, bind the outer longitudinal reinforcement 131 and outer stirrups 132, and embed the prestressed steel bars 32. Finally, pour the column concrete 14. The prestressed steel bars 32 in the joint area pass through the reserved holes in the connecting steel plate 311, the anchoring steel plate 315, and the prestressed reinforced concrete beam 2 and are anchored and fixed with M15-N anchors 33, and then hole grouting is carried out. The strength of the concrete used is not lower than the strength of the prestressed reinforced concrete beam 2.

[0046] In the present invention, specific examples are used to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A connection node between a PVC-FRP pipe reinforced concrete composite column and a prestressed reinforced concrete beam, characterized in that: Including: The composite column (1) includes a PVC-FRP tube (11), an inner steel reinforcement cage (12) and an outer composite steel reinforcement cage (13) respectively arranged inside and outside the PVC-FRP tube (11). Column concrete (14) is arranged on both the inner and outer sides of the PVC-FRP tube (11), and the inner steel reinforcement cage (12) and the outer composite steel reinforcement cage (13) are arranged in the column concrete (14). The prestressed reinforced concrete beam (2) is arranged on one side of the composite column (1). The joint area (3) includes a metal connection frame (31) and prestressed steel bars (32). The composite column (1) passes through the metal connection frame (31). The column concrete (14) on the outer side of the PVC-FRP tube (11) can be fixedly supported on the inner side wall of the metal connection frame (31). Both opposite ends of the metal connection frame (31) have enclosing parts, and the enclosing parts are both arranged in the column concrete (14) on the outer side of the PVC-FRP tube (11), and the enclosing parts can be fixedly arranged around the outer peripheral wall of the PVC-FRP tube (11). The prestressed reinforced concrete beam (2) is fixedly connected to the outside of the metal connection frame (31) and is arranged at an angle with the composite column (1). The prestressed steel bars (32) pass through the metal connection frame (31) and are respectively connected to two adjacent end faces of the composite column (1) and the prestressed reinforced concrete beam (2). One end of the prestressed steel bar (32) is fixedly connected to the composite column (1), and the other end is fixedly connected to the prestressed reinforced concrete beam (2).

2. The connection node of the PVC-FRP pipe reinforced concrete composite column and the prestressed reinforced concrete beam according to claim 1, characterized in that: One end of the prestressed steel bar (32) is fixedly embedded in the composite column (1), and the other end passes through the prestressed reinforced concrete beam (2). An anchor (33) is fixedly arranged at the position where the prestressed steel bar (32) passes through the prestressed reinforced concrete beam (2).

3. The connection node of the PVC-FRP pipe reinforced concrete composite column and the prestressed reinforced concrete beam according to claim 2, wherein: The composite column (1) and the prestressed reinforced concrete beam (2) are arranged in a cross shape. A plurality of the prestressed steel bars (32) are symmetrically arranged in the composite columns (1) on both sides of the joint area (3). The plurality of prestressed steel bars (32) connected in the composite column (1) on the same side cross in the joint area (3), and one end of each of the plurality of prestressed steel bars (32) away from the corresponding composite column (1) on that side is fixedly connected to the prestressed reinforced concrete beams (2) on both sides of the joint area (3).

4. The connection joint of the PVC-FRP pipe reinforced concrete composite column and the prestressed reinforced concrete beam according to claim 3, characterized in that: The metal connection frame (31) includes two connection steel plates (311) arranged opposite to each other. The outer sides of the two connection steel plates (311) can be fixedly connected to the prestressed reinforced concrete beam (2). The enclosing part at one end of the metal connection frame (31) includes two semi-circular steel plates (312), and both sides are fixedly connected to the two connection steel plates (311) through a plurality of stiffening plates (313). A plurality of the stiffening plates (313) on one side are arranged side by side at equal intervals. The two semi-circular steel plates (312) are fixedly arranged around the outer peripheral wall of the PVC-FRP tube (11) and can be fixedly connected through prestressed bolts (314).

5. The connection node of the PVC-FRP pipe reinforced concrete composite column and the prestressed reinforced concrete beam according to claim 4, characterized in that: The metal connection frame (31) further includes anchoring steel plates (315) fixedly arranged on the outer sides of the two connection steel plates (311). The two anchoring steel plates (315) are fixedly connected to the corresponding connection steel plates (311) and between the two anchoring steel plates (315) through prestressed bolts (314); the prestressed steel bars (32) can be fixedly passed through the connection steel plates (311) and the anchoring steel plates (315); on the outer sides of the two anchoring steel plates (315), there is fixedly arranged a beam connection part (317) that can be fixedly passed through the inside of the prestressed reinforced concrete beam (2).

6. The connection node of the PVC-FRP pipe reinforced concrete composite column and the prestressed reinforced concrete beam according to claim 5, characterized in that: The enclosing part at the other end of the metal connection frame (31) includes two semi-circular end plates (316). The two semi-circular end plates (316) are respectively fixedly connected to the two anchoring steel plates (315). The two semi-circular end plates (316) are fixedly arranged around the outer peripheral wall of the PVC-FRP pipe (11) and can be fixedly connected through prestressed bolts (314); the outer composite steel bar framework (13) is fixedly passed through the two semi-circular end plates (316).

7. The connection node of the PVC-FRP pipe reinforced concrete composite column and the prestressed reinforced concrete beam according to claim 4, characterized in that: The PVC-FRP pipe (11) includes a PVC pipe (111) and FRP belts (112) sleeved on the outer periphery of the PVC pipe (111) at intervals along the axial direction; The thickness of the semi-circular steel plate (312) is equal to the thickness of the PVC pipe (111), the thickness of the stiffening plate (313) is equal to twice the thickness of the PVC pipe (111), and the width of the semi-circular steel plate (312) is equal to the spacing between the adjacent FRP belts (112) of the PVC pipe (111).

8. The connection node of the PVC-FRP pipe reinforced concrete composite column and the prestressed reinforced concrete beam according to claim 1, characterized in that: The inner steel bar framework (12) includes multiple inner longitudinal bars (121) distributed circumferentially and multiple inner stirrups (122) distributed axially. The inner stirrups (122) are circumferentially tightened around the multiple inner longitudinal bars (121).

9. The connection node of the PVC-FRP pipe reinforced concrete composite column and the prestressed reinforced concrete beam according to claim 1, characterized in that: The outer composite steel bar framework (13) includes multiple outer longitudinal bars (131) distributed circumferentially and multiple outer stirrups (132) distributed axially. The outer stirrups (132) are circumferentially tightened around the multiple outer longitudinal bars (131).

10. The connection node of the PVC-FRP pipe reinforced concrete composite column and the prestressed reinforced concrete beam according to claim 1, characterized in that: The prestressed reinforced concrete beam (2) includes beam concrete (21), multiple beam longitudinal bars (22) distributed circumferentially in the beam concrete (21), and multiple beam stirrups (23) distributed axially in the beam concrete (21). The beam stirrups (23) are circumferentially tightened around the multiple beam longitudinal bars (22).

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