Assembly type bamboo-based composite frame beam-column joint based on co-extrusion technology

Abstract

The invention relates to the technical field of building structure engineering, in particular to an assembly type bamboo-based composite frame beam-column joint based on the co-extrusion technology, a bamboo-based composite stand column and a bamboo-based composite cross beam are connected through a connecting joint, the connecting joint comprises hollow cylindrical steel and two horizontal steel plates, the hollow cylindrical steel is inserted into the bamboo-based composite stand column, and the two horizontal steel plates are connected through the hollow cylindrical steel. The horizontal steel plate comprises a connecting section and an extending section, the connecting section of the horizontal steel plate is welded to the outer side of the hollow cylindrical steel, the extending section of the horizontal steel plate serves as a beam connecting part and is connected with the bamboo-based composite cross beam through a high-strength bolt, and the extending section of the horizontal steel plate covers the outer side of the bamboo-based composite cross beam; the two horizontal steel plates are arranged at intervals and divide the hollow cylindrical steel into a middle column section and two end column sections, the middle column section of the hollow cylindrical steel is bonded with the bamboo-based composite stand column through glue, and the end column sections of the hollow cylindrical steel are connected with the bamboo-based composite stand column through high-strength bolts. According to the invention, the steel consumption and the material cost can be reduced while the use space of a building is saved.

Description

Technical Field

[0001] The present invention relates to the field of building structure engineering, and in particular to an assembled bamboo-based composite frame beam-column node based on co-extrusion technology. Background Art

[0002] The construction industry plays an indispensable role in my country's steady economic growth and rising urbanization levels. However, the traditional construction industry faces significant resource and environmental challenges, which limit its ability to sustainably grow. As an innovative model, prefabricated construction has become a key driver of the construction industry's transformation and upgrading, and the achievement of green building goals. In recent years, prefabricated construction and its industrialization process have received significant attention from governments at all levels. The intensive release of relevant policies and the gradual improvement of standards have had a profound and positive impact on promoting the standardized development of my country's construction industry and facilitating the industry's transition from traditional to modern, industrialized construction models.

[0003] CN219690766U discloses an assembled bamboo-plastic composite frame structure beam-column node, and specifically discloses that the bamboo-plastic columns and the bamboo-plastic beams are connected through a connection node, the connection node includes a hollow rectangular steel, two inner partitions, and a beam connection part; two inner partitions are arranged in the hollow rectangular steel, concrete is poured between the two inner partitions, the bamboo-plastic columns are inserted into the hollow rectangular steel, and the bamboo-plastic columns and the hollow rectangular steel are connected by high-strength bolts, the beam connection part includes a T-shaped plate located above and an I-shaped plate located below, the T-shaped plate and the I-shaped plate are both welded to the outside of the hollow rectangular steel; a T-shaped groove and an I-shaped groove are provided at the end of the bamboo-plastic beam, the T-shaped plate is inserted into the T-shaped groove, the I-shaped plate is inserted into the I-shaped groove, and the T-shaped plate and the I-shaped plate are both connected to the bamboo-plastic beam by high-strength bolts. The beam-column joints are made of hollow rectangular steel filled with concrete and connected to the beams through T-plate / I-plate slots. There are the following problems: 1. Large space is occupied, and the outsourced joints (T-plate / I-plate protruding outward) encroach on the building's usable space, affecting the layout of pipelines; 2. Insufficient rigidity, stress concentration in the rectangular steel section, and low shear bearing capacity of the joints; 3. High material cost, requiring additional steel plate connectors, and a large amount of steel is used. Summary of the Invention

[0004] The present invention aims to overcome the shortcomings and deficiencies of the prior art by providing a prefabricated bamboo-based composite frame beam-column joint based on co-extrusion technology. This joint improves shear resistance and ductility while saving building space, while also reducing steel usage and material costs. Co-extrusion is an advanced material processing method that involves simultaneously extruding two or more materials with different properties, typically polymers or composite materials, while molten and forming them through a single mold to create a multi-layer composite product.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: The invention discloses an assembled bamboo-based composite frame beam-column node based on co-extrusion technology. The bamboo-based composite column and the bamboo-based composite beam are connected by a connection node. The bamboo-based composite column and the bamboo-based composite beam are manufactured by co-extrusion molding. The connection node comprises a hollow cylindrical steel and two horizontal steel plates. The hollow cylindrical steel is inserted into the bamboo-based composite column. The horizontal steel plate comprises a connection section and an extension section. The connection section of the horizontal steel plate is welded to the outside of the hollow cylindrical steel. The extension section of the horizontal steel plate serves as a beam connection portion and is connected to the bamboo-based composite beam via high-strength bolts. The extension section of the horizontal steel plate covers the outside of the bamboo-based composite beam. The two horizontal steel plates are arranged at intervals to separate the hollow cylindrical steel into an intermediate column section and two end column sections. The intermediate column section of the hollow cylindrical steel is bonded to the bamboo-based composite column by gluing, and the end column sections of the hollow cylindrical steel are connected to the bamboo-based composite column via high-strength bolts.

[0006] As a preferred embodiment, the connecting section and the extending section of the horizontal steel plate are an integrally formed structure.

[0007] As a preferred embodiment, the bamboo-based composite beam is an I-beam, and the wing plates at both ends of the I-beam are fixedly connected to the extension section of the horizontal steel plate.

[0008] As a preference, the number of bamboo-based composite columns is three, including an upper column and a lower column arranged outside the end column section of the hollow cylindrical steel, and an intermediate column arranged outside the intermediate column section of the hollow cylindrical steel.

[0009] As a preferred embodiment, the connecting section of the horizontal steel plate is connected to the hollow cylindrical steel by a full penetration rupture weld.

[0010] As a preferred embodiment, the hollow cylindrical steel is formed by welding steel plates bent into a cylindrical shape.

[0011] As a preferred embodiment, bamboo-based composite columns are used as structural load-bearing columns, and the cross-section is a lattice structure.

[0012] As a preferred embodiment, steel bars are provided on the inner edges of the bamboo-based composite columns.

[0013] As a preferred embodiment, bamboo-based composite beams are used as structural load-bearing beams, and the cross section is a lattice structure.

[0014] As a preferred embodiment, steel bars are provided in the flanges at both ends of the I-beam.

[0015] In general, the present invention has the following advantages: 1. The present invention eliminates the convex structure of the traditional outsourced node through the embedded node design (the extension section covers the outside of the beam), saves building space, and facilitates the passage of pipelines and decoration layout; by making the cross-section of the hollow cylindrical steel circular, the stress distribution is optimized, and combined with the dual fixing method of gluing the middle section and bolting the ends, the shear bearing capacity of the node is improved compared with the traditional rectangular steel node hollow cylindrical steel; the hollow cylindrical steel and horizontal steel plates can be prefabricated in the factory and only need to be bolted on site. Compared with the outsourced node, the amount of welding can be reduced, the construction speed can be increased, and the material cost can be reduced; the embedded node dissipates energy through plastic deformation, which can improve the ductility coefficient, meet the construction needs of high-intensity earthquake zones, and reduce the exposed area of ​​steel, which can reduce the risk of environmental corrosion and extend the life of the node.

[0016] 2. The horizontal steel plate of the present invention is an integrally formed structure, which avoids stress concentration in the weld seam. Compared with the split welded structure that is prone to failure due to weakening of the heat-affected zone, it can improve the overall strength of the horizontal steel plate and reduce the risk of fatigue cracking.

[0017] 3. The bamboo-based composite beam of the present invention is an I-beam, and the flange of the I-beam is connected to the extension of the horizontal steel plate by bolts, which has a direct force transmission path and improves the moment bearing capacity of the beam end.

[0018] 4. The present invention divides the bamboo-based composite column into upper columns, lower columns and middle columns to achieve segmented force, disperse the stress peak of the node, and reduce the stress concentration factor of the node area.

[0019] 5. The bamboo-based composite columns and beams of the present invention have a lattice cross-section, achieving a balance between lightness and high rigidity. The hollow lattice can be filled with concrete or steel pipes to adapt to different load-bearing requirements, thereby improving design flexibility.

[0020] 6. The present invention enhances the bending resistance of the I-beam flange through steel bars, and configures steel bars to reduce the beam end deflection of the bamboo-based composite beam, thereby improving the ultimate bearing capacity of the bamboo-based composite beam end, and is suitable for large-span structures.

[0021] 7. The present invention improves the compressive strength of the edge of the bamboo-based composite column by using steel bars, thereby preventing the bamboo-based composite column from being locally crushed and improving the axial bearing capacity of the bamboo-based composite column.

[0022] 8. The present invention adopts a full penetration rupture weld, which is an equal strength weld. The node and the base material are equal in strength, so that the weld strength is consistent with the base material, avoiding unfusion defects and extending the fatigue life of the node.

[0023] 9. The cylindrical structure of the present invention has better torsional resistance than rectangular steel and high torsional rigidity, making it suitable for wind-resistant design of high-rise buildings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural diagram of the connection node of the first embodiment.

[0025] Figure 2 Schematic diagram of the internal structure of the beam-column node of the assembled bamboo-based composite frame structure of Example 1.

[0026] Figure 3 This is a schematic structural diagram of an assembled bamboo-based composite frame beam-column node based on co-extrusion technology in Example 1.

[0027] Figure 4 4 is a cross-sectional view of the bamboo-based composite column of Example 1.

[0028] Figure 5 4 is a cross-sectional view of the bamboo-based composite beam of Example 1.

[0029] Figure 6 It is a structural diagram of the connection node of the second embodiment.

[0030] Figure 7 This is a schematic diagram of the internal structure of the assembled bamboo-based composite frame beam-column node based on co-extrusion technology in Example 2.

[0031] Figure 8 This is a structural diagram of the assembled bamboo-based composite frame beam-column node based on co-extrusion technology in Example 2.

[0032] Figure 9 It is a cross-sectional view of the bamboo-based composite column of Example 2.

[0033] Figure 10 4 is a cross-sectional view of the bamboo-based composite beam of Example 2.

[0034] Among them, 1 is hollow cylindrical steel, 2 is horizontal steel plate, 3 is bolt hole, and 4 is steel bar. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] Bamboo-based composites are high-performance composite materials made from bamboo, combined with high-performance reinforcements (such as glass fiber, carbon fiber, and resin) through prepreg technology, vacuum infusion, and compression molding. These materials offer enhanced strength, stiffness, durability, and design flexibility. They retain the advantages of bamboo while enhancing its mechanical properties through the addition of other materials, making them suitable for applications requiring high compressive and flexural strength.

[0037] Example 1 like Figures 1 to 5As shown, an assembled bamboo-based composite frame beam-column node based on co-extrusion technology, the bamboo-based composite columns and bamboo-based composite beams are manufactured by co-extrusion molding; the bamboo-based composite columns and bamboo-based composite beams are connected by a connecting node, the connecting node includes a hollow cylindrical steel and two horizontal steel plates, the hollow cylindrical steel is inserted into the bamboo-based composite column, the horizontal steel plate includes a connecting section and an extension section, the connecting section of the horizontal steel plate is welded to the outside of the hollow cylindrical steel, the extension section of the horizontal steel plate serves as a beam connection part and is connected to the bamboo-based composite beam by high-strength bolts, and the extension section of the horizontal steel plate covers the outside of the bamboo-based composite beam; the two horizontal steel plates are arranged at intervals to separate the hollow cylindrical steel into a middle column section and two end column sections, the middle column section of the hollow cylindrical steel is bonded to the bamboo-based composite column by gluing, and the end column sections of the hollow cylindrical steel are connected to the bamboo-based composite column by high-strength bolts.

[0038] The connecting section and the extending section of the horizontal steel plate are an integrally formed structure.

[0039] The connecting section of the horizontal steel plate has the same size as the cross section of the bamboo-based composite column, and the extending section of the horizontal steel plate has the same size as the upper end surface and the lower end surface of the bamboo-based composite beam.

[0040] The bamboo-based composite beam is an I-beam, with the flanges at each end of the I-beam fixedly connected to the extension of the horizontal steel plate. The extension of the horizontal steel plate is equipped with six small circular holes, and the extension of the horizontal steel plate and the flanges at each end of the I-beam are connected through high-strength bolts.

[0041] There are three bamboo-based composite columns, including an upper column and a lower column located outside the end column sections of the hollow cylindrical steel, and an intermediate column located outside the middle column section of the hollow cylindrical steel. The end column sections of the hollow cylindrical steel are bolted to the upper and lower columns of the bamboo-based composite columns with high-strength bolts, while the middle column section of the hollow cylindrical steel is bonded to the middle column of the bamboo-based composite columns using glue.

[0042] A circular hole with a larger diameter is provided at the center of the connecting section of the horizontal steel plate, and the hollow cylindrical steel is inserted into the circular hole. The connecting section of the horizontal steel plate and the hollow cylindrical steel are connected by a full penetration rupture weld.

[0043] Hollow cylindrical steel is made of steel plates bent into a cylindrical shape and welded together.

[0044] The bamboo-based composite columns serve as load-bearing structural columns, with a lattice-like cross-section. These columns comprise an inner ring of bamboo-based composites, an outer ring of bamboo-based composites, and a bamboo-based composite interlayer. The tubular inner ring is located on the inside, while the tubular outer ring is located on the outside. Multiple layers of bamboo-based composite interlayers are located between the outer and inner rings. The outer ends of the bamboo-based composite interlayers connect to the inner side of the outer ring, while the inner ends of the bamboo-based composite interlayers connect to the outer side of the inner ring, forming a lattice structure between the inner and outer rings. The inner ring has a circular cross-section, while the outer ring has a square cross-section. The bamboo-based composite interlayers are flat and run the entire length of the column. The lattice structure can be hollow, or composite layers, such as concrete or steel pipes, can be placed within the inner ring. In this embodiment, a steel bar layer is provided in the lattice structure, and the cross-section has a length of 200 mm and a width of 200 mm.

[0045] The bamboo-based composite beams serve as structural load-bearing beams. Their cross-sections are lattice-like, forming a hollow structure formed by interlaced bamboo-based composite materials. The lattice structure can remain hollow, or composite layers, such as concrete or steel pipes, can be incorporated into some of the lattices. These composite layers are placed at the top or bottom of the beam, where the load-bearing beam is subjected to tension or compression, to improve its mechanical properties. In this embodiment, a layer of steel reinforcement is incorporated into the lattice structure. The cross-section measures 300 mm in height and 200 mm in width.

[0046] A method for connecting beam-column nodes of an assembled bamboo-based composite frame based on co-extrusion technology is as follows: The 6mm thick steel plate was bent into a cylindrical shape and welded along the longitudinal seam with a full penetration weld to form a hollow cylindrical steel. The surface of the hollow cylindrical steel was sandblasted to increase the roughness of the bonding interface with the bamboo-based composite. The connecting section of the horizontal steel plate was welded to the outside of the hollow cylindrical steel with a full penetration weld at a spacing of 300mm to separate the hollow cylindrical steel into an intermediate column section. The inner wall of the intermediate column section of the hollow cylindrical steel was evenly coated with epoxy resin structural adhesive, and the intermediate column of the bamboo-based composite column was placed on the outside of the intermediate column section of the hollow cylindrical steel for pressurized fixation and curing. Drill holes in the interface between the end section of the hollow steel column and the bamboo-based composite column. Slide the upper bamboo-based composite column over the outer end section of the upper hollow steel column, and the lower bamboo-based composite column over the outer end section of the lower hollow steel column. Install high-strength bolts and tighten them symmetrically to ensure even distribution of interfacial pressure. Create bolt holes on the outer side of the I-beam flange, aligning them with the bolt holes in the horizontal steel plate extension. Lay the horizontal steel plate extension over the outer side of the I-beam flange, insert high-strength bolts, and tighten them to form a through-connection between the horizontal steel plate and the flange. This completes the beam-column joint connection.

[0047] Example 2 like Figures 6 to 10As shown, in this embodiment, a concrete layer is provided within the lattice structure of the bamboo-based composite column. Steel bars are provided at the edges of the bamboo-based composite column. The cross-section is 200 mm long and 200 mm wide.

[0048] The bamboo-based composite beams are constructed with a lattice structure containing concrete. Steel bars are placed in the flanges at each end of the I-beam. The cross-section is 300mm high and 150mm wide.

[0049] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A prefabricated bamboo-based composite frame beam-column joint based on co-extrusion technology, connecting bamboo-based composite columns and bamboo-based composite beams through a connecting joint, characterized by: The bamboo-based composite columns and bamboo-based composite beams are manufactured by co-extrusion molding; the connection nodes include hollow cylindrical steel and two horizontal steel plates. The hollow cylindrical steel is inserted into the bamboo-based composite column. The horizontal steel plate includes a connecting section and an extension section. The connecting section of the horizontal steel plate is welded to the outside of the hollow cylindrical steel. The extension section of the horizontal steel plate serves as a beam connection and is connected to the bamboo-based composite beam through high-strength bolts. The extension section of the horizontal steel plate covers the outside of the bamboo-based composite beam. The two horizontal steel plates are spaced apart to separate the hollow cylindrical steel into an intermediate column section and two end column sections. The intermediate column section of the hollow cylindrical steel is bonded to the bamboo-based composite column by gluing, and the end column sections of the hollow cylindrical steel are connected to the bamboo-based composite column by high-strength bolts.

2. The assembled bamboo-based composite frame beam-column node based on co-extrusion technology according to claim 1, characterized in that: The connecting section and the extending section of the horizontal steel plate are an integrally formed structure.

3. The assembled bamboo-based composite frame beam-column node based on co-extrusion technology according to claim 1, characterized in that: The bamboo-based composite beam is an I-beam, and the flanges at both ends of the I-beam are fixedly connected to the extension section of the horizontal steel plate.

4. The assembled bamboo-based composite frame beam-column node based on co-extrusion technology according to claim 1, characterized in that: There are three bamboo-based composite columns, including an upper column and a lower column arranged outside the end column section of the hollow cylindrical steel, and a middle column arranged outside the middle column section of the hollow cylindrical steel.

5. The assembled bamboo-based composite frame beam-column node based on co-extrusion technology according to claim 1, characterized in that: The bamboo-based composite columns serve as structural load-bearing columns, and their cross-section is a lattice structure.

6. The assembled bamboo-based composite frame beam-column joint based on co-extrusion technology according to claim 5, characterized in that: Steel bars are provided on the inner edges of the bamboo-based composite columns.

7. The assembled bamboo-based composite frame beam-column joint based on co-extrusion technology according to claim 3, characterized in that: The bamboo-based composite beams serve as structural load-bearing beams, and their cross-section is a lattice structure.

8. The assembled bamboo-based composite frame beam-column joint based on co-extrusion technology according to claim 7, characterized in that: Steel bars are set in the flanges at both ends of the I-beam.

9. The assembled bamboo-based composite frame beam-column joint based on co-extrusion technology according to claim 1, characterized in that: The connecting section of the horizontal steel plate is connected to the hollow cylindrical steel by a full penetration rupture weld.

10. The assembled bamboo-based composite frame beam-column joint based on co-extrusion technology according to claim 1, characterized in that: Hollow cylindrical steel is made of steel plates bent into a cylindrical shape and welded together.

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