An adjustable prestressed self-resetting engineering bamboo beam-column joint

Abstract

The present invention relates to an adjustable prestressed self-resetting engineering bamboo beam-column node, comprising an engineering bamboo column, an engineering bamboo beam, and a self-resetting system. In a virtual X, Y, and Z space, the engineering bamboo column is located on the upper and lower sides of the node, respectively, and has X-direction through holes extending along the X direction, with plastic sleeves inserted into the X-direction through holes. The engineering bamboo beam is located on the side of the node and has Z-direction through holes extending along the Z direction, with plastic sleeves also inserted into the Z-direction through holes. The self-resetting system comprises a prestressed steel strand and a prestressing device. The prestressed steel strand passes through the upper X-direction through hole, the Z-direction through hole, and the lower X-direction through hole in sequence, and is anchored to the engineering bamboo column at both ends via an anchoring device. The prestressed steel strand is provided with a plurality of prestressing loss monitoring devices, and a control center instantly receives prestressing monitoring feedback and adjusts the prestressing force applied by the prestressing device.

Description

Technical Field

[0001] The invention relates to an adjustable prestressed self-resetting engineering bamboo beam-column node, belonging to the technical field of civil engineering. Background Art

[0002] In recent years, with the continuous improvement of manufacturing and processing technology, engineered bamboo structures represented by glued bamboo and reconstructed bamboo have gradually been used in the construction field.

[0003] Beam-column bolt-steel filler plate joints are a common beam-column connection method in engineered bamboo structures. These joints have attracted widespread attention due to their low carbon footprint, environmental friendliness, aesthetic appeal, and ease of construction.

[0004] However, the transverse tensile strength of engineered bamboo is very low, which makes the joints prone to brittle splitting failure under bending moments and produces significant irreversible deformation. Therefore, it is necessary to take technical measures to improve the bending bearing capacity and self-resetting performance of the joints. Summary of the Invention

[0005] The present invention aims to provide an adjustable prestressed, self-resetting engineering bamboo beam-column joint. By applying prestress, the joint's self-resetting performance, initial stiffness, and flexural bearing capacity are enhanced. A steering device significantly reduces prestress loss during tensioning and use. Adjustable prestress is achieved through the linkage of a prestress loss monitoring device and a jack.

[0006] The present invention adopts the following technical solutions:

[0007] An adjustable prestressed, self-resetting engineering bamboo beam-column node comprises an engineering bamboo column 1, an engineering bamboo beam 4, and a self-resetting system. In a virtual X, Y, and Z space, the engineering bamboo column 1 is located on the upper and lower sides of the node, with X-direction through-holes extending along the X direction, and plastic sleeves 10 are inserted into the X-direction through-holes. The engineering bamboo beam 4 is located on the side of the node, with Z-direction through-holes extending along the Z direction, and plastic sleeves 10 are also inserted into the Z-direction through-holes. The self-resetting system comprises a prestressed steel strand 5 and a prestressing device 8. The prestressed steel strand 5 sequentially passes through the upper X-direction through-hole, the Z-direction through-hole, and the lower X-direction through-hole, and is anchored to the engineering bamboo column 1 at both ends by anchoring devices 7. The prestressed steel strand 5 is provided with a plurality of prestressing loss monitoring devices 9, and a control center immediately receives prestressing monitoring feedback and adjusts the prestress applied by the prestressing device 8.

[0008] Preferably, a steering device 6 is further included, which is fixed on the engineering bamboo column 1 and the engineering bamboo beam 4 and guides the direction of the prestressed steel strand 5.

[0009] Preferably, a groove is provided on the surface of the connection between the engineering bamboo column 1 and the engineering bamboo beam 4 along the Y direction, an embedded filling plate 3 is inserted into the groove, and a group of bolts 2 pass through the screw holes on the embedded filling plate 3 along the Y direction and extend into the engineering bamboo column 1 or the engineering bamboo beam 4.

[0010] Furthermore, the steering device 6 is a fixed pulley.

[0011] Furthermore, the thickness of the groove is 1 mm greater than the thickness of the embedded steel plate 3 , and the diameter of the screw hole is 1 mm greater than the diameter of the bolt 2 .

[0012] Preferably, the plastic sleeve 10 is fixed to the X-direction through hole and the Y-direction through hole by means of structural adhesive.

[0013] Preferably, the cross-sectional size and quantity of the prestressed steel strands 5 are positively correlated with the cross-sectional size and bending bearing capacity of the node.

[0014] Preferably, there are four steering devices 6, which are symmetrically arranged on the upper and lower sides of the node.

[0015] Preferably, the prestressing device 8 is a jack.

[0016] Preferably, tensioning is performed at both ends of the prestressed steel strand, and the tensioning control stress is taken as 0.5 times the nominal yield strength of the prestressed steel strand.

[0017] The beneficial effects of the present invention are:

[0018] 1) Improve the self-resetting performance, initial stiffness and bending bearing capacity of engineering bamboo beam-column joints by applying prestress.

[0019] 2) The loss of prestress during tensioning and use is significantly reduced by setting a steering device.

[0020] 3) The adjustable function of prestress is realized through the linkage of the prestress loss monitoring device and the jack.

[0021] 4) The structure is simple and the construction is convenient, which greatly improves the reliability and durability of the engineering bamboo beam-column joints and facilitates the promotion of engineering bamboo components. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of the adjustable prestressed self-resetting engineering bamboo beam-column node of the present invention. Figure 1 It is a plan view, so the Y direction is not shown in the figure.

[0023] In the figure, 1. Engineered bamboo column, 2. Bolt, 3. Embedded steel plate, 4. Engineered bamboo beam, 5. Prestressed steel strand, 6. Steering device, 7. Anchoring device, 8. Prestressing device, 9. Prestress loss monitoring device, 10. Plastic casing. DETAILED DESCRIPTION

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0025] See also Figure 1 The adjustable prestressed self-resetting engineering bamboo beam-column node includes an engineering bamboo column 1, a bolt 2, an embedded steel filling plate 3, an engineering bamboo beam 4, a prestressed steel strand 5, a steering device 6, an anchoring device 7, a jack 8, a prestress loss monitoring device 9 and a plastic sleeve 10.

[0026] See also Figure 1 When making the adjustable prestressed self-resetting engineering bamboo beam-column node: groove the engineering bamboo column 1 and the engineering bamboo beam 4 and drill holes perpendicular to the paper direction (Y direction). The groove thickness should be 1mm larger than the thickness of the embedded steel filling plate, and the screw hole diameter should be 1mm larger than the bolt diameter.

[0027] See also Figure 1 When making the adjustable prestressed self-resetting engineering bamboo beam-column node: put the embedded steel filling plate 3 into the engineering bamboo column and engineering bamboo beam groove, and then use the through bolts to form a connection.

[0028] See also Figure 1 When making the adjustable prestressed self-resetting engineering bamboo beam-column node: drill holes in the engineering bamboo column 1 and the engineering bamboo beam 4 parallel to the paper direction (X direction), insert the plastic sleeve 10 into the hole, and use structural adhesive to enhance the firmness of the bonding between the plastic sleeve 10 and the engineering bamboo component.

[0029] See also Figure 1 When the adjustable prestressed self-resetting engineering bamboo beam-column node is produced: the cross-sectional size and quantity of the prestressed steel strand 5 can be determined comprehensively based on the cross-sectional size and bending bearing capacity of the node.

[0030] Continue to see Figure 1 When making the adjustable prestressed self-resetting engineering bamboo beam-column node: set the corresponding steering device 6 near the plastic sleeve 10, insert the prestressed steel strand 5 into the upper part of the engineering bamboo column 1, pass through two steering devices 6 and then pass through the engineering bamboo beam 4, and then pass through two steering devices 6 and then pass through the lower part of the engineering bamboo column 1.

[0031] Continue to see Figure 1 When the adjustable prestressed self-resetting engineering bamboo beam-column node is produced: a jack 8 and an anchoring device 7 are set at both ends of the prestressed steel strand, and a prestress loss monitoring device 9 is set in the middle of the prestressed steel strand 5.

[0032] Continue to see Figure 1 When making the adjustable prestressed self-resetting engineering bamboo beam-column node: tensioning is performed at both ends of the prestressed steel strand, and the tensioning control stress should be 0.5 times the nominal yield strength of the prestressed steel strand.

[0033] When the prestress is lost, the prestress can be restored to its original level by the jack 8.

[0034] Here is a specific example:

[0035] like Figure 1 As shown, an adjustable prestressed self-resetting engineering bamboo beam-column node includes an engineering bamboo column 1, a bolt 2, an embedded steel filler plate 3, an engineering bamboo beam 4, a prestressed steel strand 5, a steering device 6, an anchoring device 7, a jack 8, a prestress loss monitoring device 9 and a plastic sleeve 10.

[0036] The cross-sectional dimensions of the engineered bamboo column 1 and the engineered bamboo beam 4 are 305mm×305mm and 130mm×305mm, respectively. The cross-sectional dimensions of the embedded steel filler plate 3 are 305mm×610mm, and the thickness is 10mm. The diameter of the bolt 2 is 20mm, and the spacing, edge distance, and end distance are 190mm, 70mm, and 140mm, respectively. The prestressed steel strand 5 is an 1860 grade steel strand (15.2mm diameter), and there is one strand. The angle between the strand and the engineered bamboo beam between the two steering devices 6 is 45°. The engineered bamboo column 1 and the engineered bamboo beam 4 are slotted and drilled perpendicular to the paper. The slot thickness is 1mm greater than the thickness of the embedded steel filler plate 3, and the screw hole diameter is 1mm greater than the diameter of the bolt 2. The embedded steel filler plate 3 is placed in the slots of the engineered bamboo column 1 and the engineered bamboo beam 4, and then the through bolts are used to form a connection. Holes are drilled parallel to the paper in the engineered bamboo columns 1 and beams 4. Plastic sleeves 10 are inserted into the holes, and epoxy resin is used to strengthen the bond between the sleeves and the engineered bamboo components. A deflection device 6 is installed near the plastic sleeves 10. The prestressed steel strand 5 is passed through the upper portion of the engineered bamboo column 1, then through two deflection devices 6, and then through two more deflection devices 6, into the lower portion of the engineered bamboo column 4. Jacks 8 and anchoring devices 7 are installed at each end of the prestressed steel strand 5, and a prestress loss monitoring device 9 is installed in the middle of the prestressed steel strand 5. Tensioning is applied at both ends of the prestressed steel strand, with a controlled tensioning stress of 930 MPa. When prestressing damage exceeds 30% of the controlled tensioning stress, the prestress is restored to its original level using jacks 8.

[0037] The above are preferred embodiments of the present invention. Those skilled in the art may make various changes or improvements based on the above. Without departing from the overall concept of the present invention, these changes or improvements should fall within the scope of protection claimed by the present invention.

Claims

1. An adjustable prestressed self-resetting engineering bamboo beam-column joint, characterized by: It comprises an engineering bamboo column (1), an engineering bamboo beam (4), and a self-resetting system; In a virtual X, Y, and Z space: the engineering bamboo column (1) is located on both sides of the node, and has X-direction through holes extending in the X direction, and a plastic sleeve (10) is inserted into the X-direction through hole; the engineering bamboo beam (4) is located on the side of the node, and has a Z-direction through hole extending in the Z direction, and a plastic sleeve (10) is also inserted into the Z-direction through hole; The self-resetting system comprises a prestressed steel strand (5) and a prestressing device (8); the prestressed steel strand (5) passes through the upper X-direction through hole, the Z-direction through hole, and the lower X-direction through hole in sequence, and both ends are anchored to the engineering bamboo column (1) through an anchoring device (7); The prestressed steel strand (5) is provided with a plurality of prestress loss monitoring devices (9), and the control center immediately receives prestress monitoring feedback and adjusts the prestress applied by the prestress applying device (8); It also includes a steering device (6), which is fixed on the engineering bamboo column (1) and the engineering bamboo beam (4) and guides the direction of the prestressed steel strand (5); A groove is provided on the surface of the connection between the engineering bamboo column (1) and the engineering bamboo beam (4) along the Y direction, an embedded filling plate (3) is inserted into the groove, and a group of bolts (2) pass through the screw holes on the embedded filling plate (3) along the Y direction and extend into the engineering bamboo column (1) or the engineering bamboo beam (4).

2. The adjustable prestressed self-resetting engineering bamboo beam-column joint according to claim 1, characterized in that: The steering device (6) is a fixed pulley.

3. The adjustable prestressed self-resetting engineering bamboo beam-column joint according to claim 1, characterized in that: The thickness of the groove is 1 mm greater than the thickness of the embedded filling plate (3), and the diameter of the screw hole is 1 mm greater than the diameter of the bolt (2).

4. The adjustable prestressed self-resetting engineering bamboo beam-column joint according to claim 1, characterized in that: The plastic sleeve (10) is fixed to the X-direction through hole and the Y-direction through hole by means of structural adhesive.

5. The adjustable prestressed self-resetting engineering bamboo beam-column joint according to claim 1, characterized in that: The cross-sectional dimensions and quantity of the prestressed steel strands (5) are positively correlated with the cross-sectional dimensions and bending bearing capacity of the nodes.

6. The adjustable prestressed self-resetting engineering bamboo beam-column joint according to claim 1, characterized in that: The steering devices (6) are provided with four and are symmetrically arranged on both sides of the node.

7. The adjustable prestressed self-resetting engineering bamboo beam-column joint according to claim 1, characterized in that: The prestressing device (8) is a jack.

8. The adjustable prestressed self-resetting engineering bamboo beam-column joint according to claim 1, characterized in that: Tensioning is performed at both ends of the prestressed steel strand, and the tensioning control stress is taken as 0.5 times the nominal yield strength of the prestressed steel strand.

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