A beam-column joint reinforced by FRP tubes

Abstract

The present invention discloses a beam-column node reinforced by an FRP tube, belonging to the technical field of construction building structure, comprising a node formwork for holding concrete, wherein a plurality of steel bars are arranged in the node formwork, and the plurality of steel bars are staggered horizontally and vertically, and an FRP tube is vertically placed at the node position in the node formwork, wherein a plurality of through-holes are provided through the side surface of the FRP tube, and steel bars are provided through the plurality of through-holes, and the FRP tube is provided at the middle position of the beam-column node, and the FRP tube provides 45° shear resistance and circumferential constraint to the beam-column node through the tubular structure, thereby improving the bending resistance of the beam-column node under a vibration environment, and by providing the FRP tube instead of the vertical steel bars, the setting of steel bars is reduced, thereby improving construction efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of construction building structures, and particularly relates to a beam-column node reinforced by an FRP tube. Background Art

[0002] The beam-column joint, the pivotal point for transmitting force throughout the entire system, is a crucial component for ensuring structural integrity. It's the point where beams and columns intersect in a frame structure. Its function is to connect and transfer loads, thus integrating the beam-column structure. The design and construction of beam-column joints are crucial to the stability and safety of the entire structure.

[0003] Due to the insufficient shear bearing capacity of beam-column joints, shear forces concentrate at the joints during earthquakes, increasing the risk of joint failure. Shear failure is brittle and typically occurs at a 45° angle, occurring rapidly and difficult to warn. Due to the combined effects of bending moment and shear forces, beam-column joints are prone to bending-shear effects, which concentrate shear forces and increase the risk of joint failure. Therefore, existing technologies generally increase the amount of steel reinforcement within beam-column joints. This results in dense reinforcement at the joints, lowering construction efficiency, taking up too much concrete space, and reducing the concrete structure. Summary of the Invention

[0004] In view of this, the object of the present invention is to provide a beam-column joint reinforced by FRP tubes. By adding FRP tubes, the beam-column joint is provided with 45° shear resistance and circumferential constraint, thereby improving the shear resistance and reducing the use of steel bars.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] The present invention includes a node formwork for holding concrete, wherein a plurality of steel bars are arranged in the node formwork, and the steel bars are staggered horizontally and vertically. An FRP tube is vertically placed at the node position in the node formwork, and a plurality of through-holes are provided on the side of the FRP tube, and steel bars are arranged through the through-holes.

[0007] Furthermore, it also includes two cross rails, which are parallel to each other, and the two ends of the two cross rails are respectively slidably arranged on the upper edge of the FRP tube. It also includes a top plate, which is slidably arranged on the two cross rails at the same time. A circular hole is vertically opened on the top plate, and a vertical shaft is slidably arranged in the circular hole. A cross beam is horizontally slidably arranged at the bottom end of the vertical shaft, and a guide groove is opened on the cross beam.

[0008] Furthermore, a rack is provided on the upper side of the horizontal beam, a gear meshing with the rack is provided inside the bottom end of the vertical shaft, a first rotating wheel is provided coaxially with the gear, a second rotating wheel is provided inside the upper end of the vertical shaft, the second rotating wheel extends out of the vertical shaft along the rotating shaft and is fixedly connected to a rotating handle, and an elastic rope loop is wrapped around the second rotating wheel and the first rotating wheel at the same time.

[0009] Furthermore, a pressure plate is provided in the top plate for vertical movement, a spring is provided between the pressure plate and the top plate, the pressure plate is located above the horizontal rail in the top plate, a threaded hole coaxial with the circular hole is provided on the top of the top plate, a rotating drum is threadedly connected to the threaded hole, the rotating drum has a conical hole coaxial with the circular hole, a plurality of arc-shaped pieces are provided around the circular hole on the inner side of the top plate, the outer side of the arc-shaped piece is a conical surface, the rotating drum is located above the pressure plate, and the arc-shaped piece is located inside the conical hole, and the rotating drum is rotated to move the rotating drum downward, and the rotating drum presses down the pressure plate and retracts the arc-shaped piece inward, thereby locking the movement of the top plate and the vertical axis.

[0010] Furthermore, the cross section of the cross beam is J-shaped, the upper edge of the cross beam is slidably arranged in the vertical axis, and the guide slot opens upward on the cross beam.

[0011] Furthermore, the two transverse rails are symmetrically arranged relative to the diameter of the FRP tube.

[0012] The beneficial effects of the present invention are:

[0013] The present invention arranges FRP tubes in the middle of the beam-column joint. The FRP tubes provide 45° shear resistance and circumferential constraint to the beam-column joint through the tubular structure, thereby improving the bending resistance of the beam-column joint under a vibration environment. By arranging FRP tubes instead of vertical steel bars, the number of steel bars required is reduced, thereby improving construction efficiency.

[0014] Other advantages, objectives and features of the present invention will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to make the purpose, technical solutions and beneficial effects of the present invention more clear, the present invention provides the following drawings for illustration:

[0016] Figure 1 This is a schematic diagram of the overall structure of a beam-column node according to an embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of an FRP pipe penetrating a steel pipe according to an embodiment of the present invention;

[0018] Figure 3 This is a schematic diagram of the internal structure of an FRP tube according to an embodiment of the present invention;

[0019] Figure 4 for Figure 3 A sectional view of the part;

[0020] Figure 5 for Figure 3 Cross-sectional view at point B;

[0021] The markings in the accompanying drawings are as follows: 1. Node formwork; 2. FRP tube; 21. Perforation; 3. Cross rail; 4. Top plate; 41. Round hole; 42. Pressure plate; 43. Spring; 44. Threaded hole; 45. Arc-shaped piece; 5. Vertical axis; 51. Gear; 52. First rotating wheel; 53. Second rotating wheel; 531. Turning handle; 54. Elastic rope loop; 6. Cross beam; 61. Guide slide; 62. Rack; 7. Rotating drum; 71. Conical hole. DETAILED DESCRIPTION

[0022] like Figure 1 The present invention discloses a beam-column joint reinforced by an FRP tube, including a node formwork 1 for holding concrete. The node formwork 1 is made according to the appearance structure of the beam-column joint. A plurality of steel bars are arranged in the node formwork 1. The plurality of steel bars are staggered horizontally and vertically and serve as the skeleton of the beam-column joint. An FRP tube 2 is vertically placed at the node position in the node formwork 1. A plurality of through-holes 21 are formed through the side of the FRP tube 2, and steel bars are arranged through the plurality of through-holes 21.

[0023] In this solution, an FRP tube 2 is installed in the middle of the beam-column joint. Through the tubular structure, the FRP tube 2 provides 45° shear resistance and circumferential constraint to the beam-column joint, thereby improving the bending resistance of the beam-column joint under a vibration environment. By installing the FRP tube 2 instead of the vertical steel bars, the number of steel bars can be reduced, thereby improving construction efficiency.

[0024] In a further solution, Figure 2 and Figure 3 As shown, it also includes two cross rails 3, the two cross rails 3 are parallel to each other, and the two cross rails 3 are symmetrically arranged with respect to the diameter of the FRP tube 2; the two ends of the two cross rails 3 are respectively slidably arranged on the upper edge of the FRP tube 2, and also includes a top plate 4, the top plate 4 is slidably arranged on the two cross rails 3 at the same time, and a coaxial vertical circular hole 41 is provided on the top plate 4, a vertical shaft 5 is slidably provided in the circular hole 41, a cross beam 6 is slidably provided at the bottom end of the vertical shaft 5, a guide groove 61 is provided on the cross beam 6, the cross beam 6 has a J-shaped cross section, the upper edge of the cross beam 6 is slidably provided in the vertical shaft 5, and the guide groove 61 opens upward on the cross beam 6.

[0025] In this solution, two parallel horizontal rails 3 are set, and the two ends of the horizontal rails 3 are slidably set on the upper edge of the FRP tube 2. By slidingly setting a top plate 4 on the two horizontal rails 3 at the same time, the top plate 4 can move along the horizontal rails 3. At the same time, the two horizontal rails 3 can rotate around the axis of the FRP tube 2, so that the top plate 4 can move to any position within a certain range above the FRP tube 2. By rotating and sliding a vertical shaft 5 set on the top plate 4, the vertical shaft 5 can move with the top plate 4, and the crossbeam 6 at the end of the vertical shaft 5 can rotate and move up and down with the vertical shaft 5, and can be horizontally moved at the end of the vertical shaft 5. Movement, through this structure, the horizontal axis can move and pass the end into any perforation 21 located on the side of the FRP tube 2. At this time, the steel bar can be moved along the guide chute 61. The guide chute 61 serves as a guide structure for the perforation 21, supporting and guiding the steel bar so that the steel bar can smoothly pass through the perforation 21 opposite the FRP tube 2 along the guide chute 61. After completing the perforation 21, the moving crossbeam 6 can move the crossbeam 6 out and guide the next perforation 21. When the number of perforations 21 is large, this structure assists the insertion and exit of the steel bar, thereby improving the efficiency of steel bar placement.

[0026] In a further solution, Figure 3 and Figure 4 As shown, a rack 62 is provided on the upper side of the crossbeam 6, a gear 51 meshing with the rack 62 is rotatably provided inside the bottom end of the vertical shaft 5, and a first rotating wheel 52 is coaxially provided on the gear 51. A second rotating wheel 53 is rotatably provided inside the upper end of the vertical shaft 5, and the second rotating wheel 53 extends out of the vertical shaft 5 along the rotating axis and is fixedly connected to a rotating handle 531. An elastic rope loop 54 is wrapped around the second rotating wheel 53 and the first rotating wheel 52.

[0027] In this structure, by rotating the handle 531 at the top of the vertical shaft 5, the second rotating wheel 53 rotates, and the first rotating wheel 52 rotates along with the elastic rope ring 54. The first rotating wheel 52 drives the gear 51 to rotate, and the gear 51 drives the rack 62 and the crossbeam 6 to move. In this structure, the elastic rope ring 54 is provided to ensure that the first rotating wheel 52 and the second rotating wheel 53 are tightened. By controlling the rotating handle 531 at the top of the vertical shaft 5, the movement of the crossbeam 6 can be smoothly controlled. The operation is flexible and unobstructed, which is convenient for observation and control.

[0028] In a further solution, Figure 5As shown, a pressure plate 42 is provided in the top plate 4 for vertical movement, and a spring 43 is provided between the pressure plate 42 and the top plate 4. The pressure plate 42 is located above the cross rail 3 in the top plate 4, and a threaded hole 44 coaxial with the circular hole 41 is provided on the top of the top plate 4. The threaded hole 44 is threadedly connected to a rotating drum 7, and the rotating drum 7 is provided with a conical hole 71 coaxial with the circular hole 41. A plurality of arc-shaped pieces 45 are provided around the circular hole 41 on the inner side of the top plate 4, and the outer side of the arc-shaped piece 45 is a conical surface. The rotating drum 7 is located above the pressure plate 42, and the arc-shaped piece 45 is located inside the conical hole 71. Rotating the rotating drum 7 causes the rotating drum 7 to move downward, and the rotating drum 7 presses down the pressure plate 42 and retracts the arc-shaped piece 45 inward, thereby locking the movement of the top plate 4 and the vertical axis 5.

[0029] In this structure, after the position of the crossbeam 6 is determined, the top plate 4 and the vertical axis 5 can be quickly locked by rotating the rotating drum 7, limiting the vertical movement and rotation of the vertical axis 5, and at the same time limiting the movement of the top plate 4 on the cross rail 3. After the end of the crossbeam 6 is inserted into the through hole 21, the fixation of the vertical axis 5 and the top plate 4 can significantly reduce the shaking of the entire frame and enhance the guiding function of the crossbeam 6.

[0030] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A beam-column joint reinforced with FRP tubes, characterized by: The invention comprises a node formwork (1) for holding concrete, wherein a plurality of steel bars are arranged in the node formwork (1), and the plurality of steel bars are staggered horizontally and vertically. An FRP tube (2) is vertically placed at the node position in the node formwork (1), and a plurality of through-holes (21) are provided through the side of the FRP tube (2), and steel bars are provided through the through-holes (21); the invention also comprises two transverse rails (3), the two transverse rails (3) are parallel to each other, and the two ends of the two transverse rails (3) are respectively slidably arranged on the upper edge of the FRP tube (2); the invention also comprises a top plate (4), the top plate (4) is slidably arranged on the two transverse rails (3) at the same time, a circular hole (41) is vertically provided on the top plate (4), a vertical shaft (5) is slidably provided in the circular hole (41), a horizontal beam (6) is slidably provided at the bottom end of the vertical shaft (5), and a guide slot (61) is provided on the horizontal beam (6); a vertically movable vertical shaft is provided in the top plate (4). A pressure plate (42) is provided, and a spring (43) is provided between the pressure plate (42) and the top plate (4). The pressure plate (42) is located above the inner cross rail (3) of the top plate (4). A threaded hole (44) coaxial with the circular hole (41) is provided on the top of the top plate (4). A rotating drum (7) is threadedly connected to the threaded hole (44). The rotating drum (7) is provided with a conical hole (71) coaxial with the circular hole (41). The inner side of the top plate (4) surrounds the The circular hole (41) is provided with a plurality of arc-shaped pieces (45), the outer sides of the arc-shaped pieces (45) are tapered, the rotating cylinder (7) is located above the pressure plate (42), and the arc-shaped pieces (45) are located inside the tapered hole (71). The rotating cylinder (7) is rotated to move the rotating cylinder (7) downward, and the rotating cylinder (7) presses down the pressure plate (42) and retracts the arc-shaped pieces (45) inward, while locking the movement of the top plate (4) and the vertical shaft (5).

2. The beam-column joint reinforced by FRP tubes according to claim 1, characterized in that: A rack (62) is provided on the upper side of the crossbeam (6), a gear (51) meshing with the rack (62) is rotatably provided inside the bottom end of the vertical shaft (5), and a first rotating wheel (52) is coaxially provided on the gear (51), and a second rotating wheel (53) is rotatably provided inside the upper end of the vertical shaft (5), the second rotating wheel (53) extends out of the vertical shaft (5) along the rotating axis and is fixedly connected to a rotating handle (531), and an elastic rope loop (54) is simultaneously wrapped around the second rotating wheel (53) and the first rotating wheel (52).

3. The beam-column joint reinforced by FRP tubes according to claim 2, characterized in that: The cross-section of the cross-beam (6) is J-shaped, the upper edge of the cross-beam (6) is slidably arranged in the vertical shaft (5), and the guide slot (61) opens upward on the cross-beam (6).

4. The beam-column joint reinforced by FRP tubes according to claim 3, characterized in that: The two transverse rails (3) are symmetrically arranged relative to the diameter of the FRP tube (2).

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