Beam type test piece for testing bonding performance of built-in steel bar-recombined bamboo and preparation method of beam type test piece

Abstract

The invention discloses a beam type test piece for testing bonding performance of built-in steel bar-recombined bamboo and a preparation method of the beam type test piece. The beam type test piece is characterized in that a connecting piece I and a connecting piece II which are hinged with each other are respectively fixed with a recombined bamboo beam I and a recombined bamboo beam II which are arranged in the same direction; a first steel bar is arranged in the first recombined bamboo beam, and a second steel bar is arranged in the second recombined bamboo beam. One ends of part of the steel bars I in the plurality of steel bars I are positioned outside the recombined bamboo beam I, and one ends of part of the steel bars II in the plurality of steel bars II are positioned outside the recombined bamboo beam II; and the steel bar I outside the recombined bamboo beam I is fixedly connected with the steel bar II outside the recombined bamboo beam II. In the process of testing the bonding performance of the built-in reinforcing steel bar-recombined bamboo, the first recombined bamboo beam and the second recombined bamboo beam can rotate mutually and can limit the relative horizontal displacement of the first recombined bamboo beam and the second recombined bamboo beam when being pressed, the stress conditions of the first reinforcing steel bar and the second reinforcing steel bar bonded in the recombined bamboo can be reflected to the maximum extent under the load effect, and the stress conditions conform to the actual component stress; the preparation method of the beam test piece is simple and reliable.

Description

Technical Field

[0001] The invention relates to the field of bamboo-wood structures in civil engineering, and more particularly to a beam-type specimen for testing the bonding performance of built-in steel bars and reconstructed bamboo and a preparation method thereof. Background Art

[0002] In the context of developing green, environmentally friendly ecological buildings, bamboo building materials and modern bamboo structure buildings have natural advantages and huge potential. Compared with the traditional building materials commonly used currently, bamboo has the advantages of short growth cycle, high strength-to-weight ratio, light weight and earthquake resistance, and can be naturally degraded after disposal. It can be called a natural green building material.

[0003] Reconstructed bamboo is a new type of green bamboo engineering material that uses raw bamboo as the main raw material and is made through processes such as splitting, bamboo stripping, drying, dipping in glue, paving, and hot pressing. Reconstructed bamboo is light and high-strength, and can be combined with different materials to form composite components. It has low energy consumption and a high degree of industrialization. However, the cross-sectional stiffness of reconstructed bamboo components is small, the elastic modulus is low, and the ductility is also poor. Therefore, one of the existing practices is to embed steel bars into reconstructed bamboo components. The combination of the two as structural components can give full play to the strength of reconstructed bamboo and steel, enhance the ductility of components, increase the design span, and comply with the green, low-carbon and sustainable development policy. At the same time, when processing reconstructed bamboo, the steel bars are pre-embedded into the bamboo bundle by hot pressing to form an integrated structure, without the need for secondary drilling and grooving to plant steel bars, thus avoiding weakening of the cross-section of the component, which is beneficial to improving the overall stiffness, bearing capacity and ductility of the component.

[0004] For the composite components of the above-mentioned steel bars and reconstructed bamboo, good bonding and anchoring performance between the reconstructed bamboo and the embedded steel bars is the prerequisite for the coordinated work of the two, and is also an important guarantee for the built-in steel bar-reconstructed bamboo beam to have reliable structural performance.

[0005] At present, the research on the bonding performance between steel bars and concrete is relatively mature. Studies have shown that there are many factors affecting the bonding performance, and the actual bonding stress state is complex, which makes the applicability of the bonding performance test results not strong. The currently commonly used bonding test method is the central pull test. Although this method brings convenience to the loading conditions and the preparation of test specimens, due to the large differences in the actual stress forms of various structural components, there is a local extrusion force at the loading end when the load is applied, which will affect the reliability of the test results.

[0006] Therefore, it is necessary to provide a beam-type specimen for testing the bonding performance of built-in steel bars and reconstructed bamboo and a preparation method thereof, so that the above-mentioned problems can be overcome. Summary of the invention

[0007] In view of this, the present invention provides a beam-type specimen for testing the bonding performance of built-in steel bars and reconstructed bamboo.

[0008] In order to achieve the above object, the present invention adopts the following technical solution:

[0009] A beam-type specimen for testing the bonding performance of built-in steel bars and reorganized bamboo, comprising a connector 1, a connector 2, a reorganized bamboo beam 1 and a reorganized bamboo beam 2, wherein the connector 1 is hinged to the connector 2 and the two have a hinge axis, the connector 1 and the connector 2 are respectively detachably fixed to the reorganized bamboo beam 1 and the reorganized bamboo beam 2, the hinge axis is centrally arranged between the reorganized bamboo beam 1 and the reorganized bamboo beam 2, the length direction of the reorganized bamboo beam 1 is perpendicular to the hinge axis, the center line of the reorganized bamboo beam 1 in the length direction is collinear with the center line of the reorganized bamboo beam 2 in the length direction; a plurality of reorganized bamboo beams having the same length direction are arranged inside the reorganized bamboo beam 1. The reorganized bamboo beam 2 is provided with a plurality of rebars 2 in the same length direction thereof; the plurality of rebars 1 and the plurality of rebars 2 are respectively positioned opposite to each other along the length direction of the reorganized bamboo beam 1; one end of some of the rebars 1 among the plurality of rebars 1 is located outside the reorganized bamboo beam 1, and one end of some of the rebars 2 among the plurality of rebars 2 is located outside the reorganized bamboo beam 2; the end of the rebar 1 located outside the reorganized bamboo beam 1 corresponds to and is fixedly connected to the end of the reorganized bamboo beam 2 located outside the reorganized bamboo beam 2; the center line of the reorganized bamboo beam 1 in the length direction is located between the hinge axis and the end of the rebar 1 located outside the reorganized bamboo beam 1.

[0010] Through the above technical scheme, it can be known that compared with the prior art, the present invention discloses a beam-type specimen for testing the bonding performance of built-in steel bars and reorganized bamboo. The beam-type specimen in the present invention includes a reorganized bamboo beam 1 and a reorganized bamboo beam 2, the reorganized bamboo beam 1 and the reorganized bamboo beam 2 are hinged by a connecting piece 1 and a connecting piece 2, a steel bar 1 is arranged inside the reorganized bamboo beam 1, a steel bar 2 is arranged inside the reorganized bamboo beam 2, and a partially extended steel bar 1 in the reorganized bamboo beam 1 is connected to a partially extended steel bar 2 in the reorganized bamboo beam 2; when testing the bonding performance of built-in steel bars and reorganized bamboo When the test piece is subjected to tension, the tensile region of the beam specimen is the steel bars 1 and 2 to be tested, and the compression region is provided with the hinged connectors 1 and 2. The above design enables the reconstructed bamboo beams 1 and 2 to rotate relative to each other and limit their relative horizontal displacement when subjected to compression. Under the action of load, the stress conditions of the steel bars 1 and 2 bonded in the reconstructed bamboo can be reflected to the greatest extent, which is consistent with the stress of the actual components. The lever arm is simple and the force transmission is clear, which can accurately simulate the bonding state of the steel bars in the reconstructed bamboo under the action of bending moment and shear force.

[0011] Preferably, the cross-sections of the reorganized bamboo beam 1 and the reorganized bamboo beam 2 are both rectangular, and the long side wall and the wide side wall of the reorganized bamboo beam 1 are aligned with the long side wall and the wide side wall of the reorganized bamboo beam 2 respectively; two rows of the steel bars 1 are fixed in sequence in the reorganized bamboo beam 1 and along the length direction of its cross section, and each row of the steel bars 1 is provided with a plurality of steel bars, and the plurality of steel bars 1 in the same row are arranged equidistantly in sequence along the width direction of the cross section of the reorganized bamboo beam 1; the width direction of the cross section of the reorganized bamboo beam 1 is parallel to the axis of the hinge; the center line of the reorganized bamboo beam 1 in the length direction is located between the two rows of steel bars 1. When the reorganized bamboo beam 1 and the reorganized bamboo beam 2 are under compression, it is ensured that the tensile area of ​​the beam-type specimen is the steel bars 1 and the steel bars 2 to be tested.

[0012] Preferably, the connecting member 1 comprises a rectangular plate 1, a mounting plate 1 and a hinge member 1, one end of the reorganized bamboo beam 1 is provided with a rectangular groove 1 that runs through a wide side wall and two long side walls thereof, and the end of a row of the steel bars 1 in the reorganized bamboo beam 1 is flush with the groove side walls of the rectangular groove 1; the rectangular plate 1 is tightly embedded in the rectangular groove 1, and one mounting plate 1 is vertically fixed to each of the two ends of the rectangular plate 1, and the plate surfaces of the two mounting plates 1 are respectively close to the two long side walls of the reorganized bamboo beam 1, and a through hole 1 is provided on the mounting plate 1, and one end of a screw 1 is fixed to the reorganized bamboo beam 1 after passing through the through hole 1; the hinge member 1 is fixed to the rectangular plate 1, the rectangular plate 1 is located between the hinge member 1 and the mounting plate 1, and the hinge member 1 is provided with a hinge hole 1; the connecting member 2 comprises a rectangular plate 2, a mounting plate 2 and a and a hinge part 2, one end of the reorganized bamboo beam 2 is provided with a rectangular groove 2 running through a wide side wall and two long side walls thereof, and the end of a row of the steel bars 2 in the reorganized bamboo beam 2 is flush with the groove side wall of the rectangular groove 2; the rectangular plate 2 is tightly embedded in the rectangular groove 2, and each of the two ends of the rectangular plate 2 is vertically fixed with a mounting plate 2, and the plate surfaces of the two mounting plates 2 are respectively close to the two long side walls of the reorganized bamboo beam 2, and the mounting plate 2 is provided with a through hole 2, and one end of the screw 2 is fixed to the reorganized bamboo beam 2 after passing through the through hole 2; the hinge part 2 is fixed to the rectangular plate 2, and the rectangular plate 2 is located between the hinge part 2 and the mounting plate 2, and the hinge part 2 is provided with a hinge hole 2; the hinge hole 1 is coaxially arranged with the hinge hole 2, and the connecting shaft is inserted into the hinge hole 1 and the hinge hole 2 at the same time. The first connecting piece can be quickly and reliably fixed on the first reorganized bamboo beam, the second connecting piece can be quickly and reliably fixed on the second reorganized bamboo beam, and the first connecting piece and the second connecting piece can be reliably hinged.

[0013] Preferably, one side surface of the rectangular plate 1 is flush with the end wall of the reorganized bamboo beam 1 provided with the rectangular groove 1; one side surface of the rectangular plate 2 is flush with the end wall of the reorganized bamboo beam 2 provided with the rectangular groove 2. When the reorganized bamboo beams 1 and 2 are arranged horizontally and under pressure, this design is conducive to the accurate transfer of loads by the connectors 1 and 2.

[0014] A method for preparing a beam specimen for testing the bonding performance of an internal steel bar and reconstructed bamboo, comprising:

[0015] ① Preparing the reconstituted bamboo beam 1 and the reconstituted bamboo beam 2: firstly laying reconstituted bamboo bundles and steel bars in a forming mold, and then pressing and forming to obtain a reconstituted bamboo board with the steel bars; cutting the reconstituted bamboo board, and gluing the cut reconstituted bamboo boards to respectively obtain the reconstituted bamboo beam 1 and the reconstituted bamboo beam 2;

[0016] ② The steel bar 1 and the steel bar 2 are fixedly connected: the end of the steel bar 1 located outside the reorganized bamboo beam 1 is fixedly connected with the corresponding end of the steel bar 2 located outside the reorganized bamboo beam 2;

[0017] ③ Install the connecting member 1 and the connecting member 2: first hinge the connecting member 1 and the connecting member 2, then fix the connecting member 1 to the reorganized bamboo beam 1, and finally fix the connecting member 2 to the reorganized bamboo beam 2.

[0018] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a method for preparing a beam-type specimen for testing the bonding performance of built-in steel bars and reconstructed bamboo. The following technical effects can be achieved:

[0019] The preparation method of the beam-type specimen is simple and reliable. The steel bars one and the steel bars two can be reliably fixed in the reorganized bamboo beam one and the reorganized bamboo beam two respectively; the steel bars one extending out of the reorganized bamboo beam one and the steel bars two extending out of the reorganized bamboo beam two can be quickly fixed by welding, the connector one and the connector two can be quickly and detachably fixed on the reorganized bamboo beam one and the reorganized bamboo beam two respectively, and the connector one and the connector two can be reused. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0021] Figure 1 It is an overall axonometric view of a beam specimen used for testing the bonding performance of built-in steel bars and reconstructed bamboo;

[0022] Figure 2 It is a local axonometric measurement of a beam specimen used for testing the bonding performance of internal steel bars and reconstructed bamboo. Figure 1 ;

[0023] Figure 3 It is a local axonometric measurement of a beam specimen used for testing the bonding performance of internal steel bars and reconstructed bamboo. Figure 2 ;

[0024] Figure 4 This is a schematic diagram of the arrangement of a beam specimen on a loading device for testing the bonding performance of internal steel bars and reconstructed bamboo. Figure 1 ;

[0025] Figure 5 A schematic diagram of the arrangement of a beam specimen on a loading device for testing the bonding performance of internal steel bars and reconstructed bamboo Figure 2 ;

[0026] Figure 6 is the test load-displacement curve of beam specimen A and beam specimen B;

[0027] Figure 7 The invention discloses a flow chart of a method for preparing a beam-type specimen for testing the bonding performance of internally-built-in steel bars and reconstructed bamboo.

[0028] In the figure:

[0029] 1 is a rectangular plate 1, 2 is a mounting plate 1, 3 is a hinge 1, 4 is a rectangular plate 2, 5 is a mounting plate 2, 6 is a hinge 2, 7 is a reorganized bamboo beam 1, 8 is a reorganized bamboo beam 2, 9 is a steel bar 1, 10 is a steel bar 2, 11 is a screw 1, 12 is a screw 2, 13 is a connecting shaft, and 14 is a loading device. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] The present invention discloses a beam-type specimen for testing the bonding performance of built-in steel bars and reorganized bamboo and a preparation method thereof. The beam-type specimen in the present invention comprises a reorganized bamboo beam 1 7 and a reorganized bamboo beam 2 8, the reorganized bamboo beam 1 7 and the reorganized bamboo beam 2 8 are hinged by a connecting piece 1 and a connecting piece 2, a steel bar 1 9 is arranged inside the reorganized bamboo beam 1 7, a steel bar 2 10 is arranged inside the reorganized bamboo beam 2 8, and the steel bar 1 9 partially extended out of the reorganized bamboo beam 1 7 is connected to the steel bar 2 10 partially extended out of the reorganized bamboo beam 2 8; when the built-in steel bar-reorganized bamboo bonding performance test is performed, the tensile area of ​​the beam-type specimen is the steel bar to be tested. The first and second rebars 9 and 10 are hingedly connected in the compression area. The above design enables the first and second reorganized bamboo beams 7 and 8 to rotate with each other and limit their relative horizontal displacement when under compression. Under the action of load, the stress conditions of the first and second rebars 9 and 10 bonded in the reorganized bamboo can be reflected to the greatest extent, which is consistent with the stress of the actual components. The lever arm is simple and the force transmission is clear, which can accurately simulate the bonding state of the rebars in the reorganized bamboo under the action of bending moment and shear force. The first and second reorganized bamboo beams used in the test can be reused, saving costs.

[0032] The connector 1 and the connector 2 have simple structures and can be quickly and reliably fixed on the reorganized bamboo beam 1 7 and the reorganized bamboo beam 2 8 respectively. In combination with the design of the rectangular groove 1 and the rectangular groove 2, when the reorganized bamboo beam 1 7 and the reorganized bamboo beam 2 8 are arranged horizontally and under pressure, the connector 1 and the connector 2 can accurately transfer the load, thereby improving the reliability of the test results.

[0033] The beam specimen in the present application has a simple structure and a reasonable design, and the connectors 1 and 2 of different sizes can be applied to reassembled bamboo beams of different cross-sectional sizes;

[0034] The preparation method of the beam-type specimen is simple and reliable. The steel bars 1 9 and the steel bars 2 10 can be reliably fixed in the reorganized bamboo beam 1 7 and the reorganized bamboo beam 2 8 respectively; the steel bars 1 9 extending out of the reorganized bamboo beam 1 7 and the steel bars 2 10 extending out of the reorganized bamboo beam 2 8 can be quickly fixed by welding, and the connector 1 and the connector 2 can be quickly and detachably fixed on the reorganized bamboo beam 1 7 and the reorganized bamboo beam 2 8 respectively, and the connector 1 and the connector 2 can be reused.

[0035] Example

[0036] See attached Figure 1-7 The whole and part of the structure schematic diagram of an embodiment of the present invention, the present invention specifically discloses a beam-type specimen for testing the bonding performance of built-in steel bars and reconstructed bamboo, the beam-type specimen comprises a connector 1, a connector 2, a reconstructed bamboo beam 1 7 and a reconstructed bamboo beam 2 8;

[0037] The first connector is hinged to the second connector and the two connectors have a hinge axis. The first connector and the second connector are detachably fixed to the first reorganized bamboo beam 7 and the second reorganized bamboo beam 8 respectively. The hinge axis is centrally arranged between the first reorganized bamboo beam 7 and the second reorganized bamboo beam 8. The length direction of the first reorganized bamboo beam 7 is perpendicular to the hinge axis.

[0038] The shapes and sizes of the reorganized bamboo beam 1 7 and the reorganized bamboo beam 2 8 are exactly the same, and the center line of the reorganized bamboo beam 1 7 in the length direction is collinear with the center line of the reorganized bamboo beam 2 8 in the length direction; in the present application, the cross-sectional shapes of the reorganized bamboo beam 1 7 and the reorganized bamboo beam 2 8 are both rectangular, and the long side wall and the wide side wall of the reorganized bamboo beam 1 7 are aligned with the long side wall and the wide side wall of the reorganized bamboo beam 2 8 respectively;

[0039] A plurality of steel bars 10 are arranged inside the reorganized bamboo beam 1 7 and in the same length direction thereof; a plurality of steel bars 10 are arranged inside the reorganized bamboo beam 2 8 and in the same length direction thereof; the plurality of steel bars 10 and the plurality of steel bars 10 are respectively positioned opposite to each other along the length direction of the reorganized bamboo beam 1 7;

[0040] One end of some of the multiple steel bars 10 is located outside the reorganized bamboo beam 1, and the ends of the steel bars 10 located outside the reorganized bamboo beam 1 are aligned; one end of some of the multiple steel bars 10 is located outside the reorganized bamboo beam 2, and the ends of the steel bars 10 located outside the reorganized bamboo beam 2 are aligned;

[0041] The end of the steel bar 1 9 located outside the reorganized bamboo beam 1 7 corresponds to the end of the steel bar 2 10 located outside the reorganized bamboo beam 2 8 and is fixedly connected by welding;

[0042] The center line of the reorganized bamboo beam 7 in the length direction is located between the hinge axis and the end of the steel bar 9 located outside the reorganized bamboo beam 7.

[0043] As for the arrangement of the steel bars 9 in the reorganized bamboo beam 7, specifically, two rows of steel bars 9 are fixed in sequence in the reorganized bamboo beam 7 and along the length direction of its cross section, each row of steel bars 9 is provided with a plurality of steel bars, and the plurality of steel bars 9 in the same row are arranged equidistantly in sequence along the width direction of the cross section of the reorganized bamboo beam 7. In this embodiment, each row of steel bars 9 is provided with two steel bars, the width direction of the cross section of the reorganized bamboo beam 7 is parallel to the hinge axis, and the center line of the reorganized bamboo beam 7 in the length direction is located between the two rows of steel bars 9; the arrangement form of the steel bars 10 in the reorganized bamboo beam 8 is the same as the arrangement form of the steel bars 9 in the reorganized bamboo beam 7.

[0044] More specifically, the connecting member 1 includes a rectangular plate 1, a mounting plate 2 and a hinge 3. A rectangular groove 1 is provided at one end of the reorganized bamboo beam 7, which runs through a wide side wall and two long side walls thereof. The end of a row of steel bars 9 in the reorganized bamboo beam 7 is flush with the groove side walls of the rectangular groove 1. The rectangular plate 1 is tightly embedded in the rectangular groove 1. A rectangular mounting plate 2 is vertically fixed at each of the two ends of the rectangular plate 1. The plate surfaces of the two mounting plates 2 are respectively in close contact with the two long side walls of the reorganized bamboo beam 7. One or more circular through holes are provided on the mounting plate 2. One end of the screw 11 is screwed on the reorganized bamboo beam 7 after passing through the through hole 1, so as to fix the mounting plate 2 and the reorganized bamboo beam 7; one side plate surface and one side wall of the rectangular plate 1 are respectively in close contact with the one side groove wall and the groove bottom wall of the rectangular groove 1, and the other side plate surface of the rectangular plate 1 is flush with the end wall of the reorganized bamboo beam 7 provided with the rectangular groove 1; the hinge 3 is fixed to the rectangular plate 1, the hinge 3 is centrally arranged between the two mounting plates 2, the rectangular plate 1 is located between the hinge 3 and the mounting plate 2, and a circular hinge hole 1 is opened on the hinge 3;

[0045] To be more specific, the second connecting member includes a rectangular plate 24, a mounting plate 25 and a hinge 26. A rectangular groove 2 is provided at one end of the reorganized bamboo beam 28, which runs through one wide side wall and two long side walls thereof. The end of a row of steel bars 210 in the reorganized bamboo beam 28 is flush with the groove side wall of the rectangular groove 2. The rectangular plate 24 is tightly embedded in the rectangular groove 2. A rectangular mounting plate 25 is vertically fixed at each of the two ends of the rectangular plate 24. The plate surfaces of the two mounting plates 25 are respectively close to the two long side walls of the reorganized bamboo beam 28. One or more circular through holes 2 are provided on the mounting plate 25. One end of the screw 212 is screwed in after passing through the through hole 2. On the reorganized bamboo beam 28, the mounting plate 2 and the reorganized bamboo beam 7 are fixed in this way; one side plate surface and one side wall of the rectangular plate 24 are respectively in close contact with one side groove wall and groove bottom wall of the rectangular groove 2, and the other side plate surface of the rectangular plate 24 is flush with the end wall of the reorganized bamboo beam 28 provided with the rectangular groove 2; the hinge 26 is fixed to the rectangular plate 24, the hinge 26 is centrally arranged between the two mounting plates 25, the rectangular plate 24 is located between the hinge 26 and the mounting plates 25, and a circular hinge hole 2 is opened on the hinge 26; the hinge hole 1 is coaxially arranged with the hinge hole 2, and the connecting shaft 13 is inserted into the hinge hole 1 and the hinge hole 2 at the same time.

[0046] A method for preparing a beam specimen for testing the bonding performance of an internal steel bar and reconstructed bamboo, comprising:

[0047] ① Preparation of recombinant bamboo beam 1 7 and recombinant bamboo beam 2 8:

[0048] Bamboo preparation stage: select bamboo, cut it into required length, remove bamboo nodes and perform fiberization to obtain bamboo fiber;

[0049] Bamboo fiber treatment: The bamboo fiber is heated and carbonized, then immersed in a glue pool for treatment, and finally dried and cured to obtain a reconstituted bamboo bundle;

[0050] Preparation of reconstituted bamboo board: laying reconstituted bamboo bundles into a hot pressing mold, and laying out steel bars in the hot pressing mold according to design requirements during the laying process, tightening and fixing the steel bars protruding from the reconstituted bamboo bundles with anchors to ensure that the position of the steel bars does not shift during the hot pressing process, and hot pressing and forming are performed after the steel bars and the reconstituted bamboo bundles are laid to obtain a reconstituted bamboo board with steel bars;

[0051] Maintenance and treatment of reconstructed bamboo boards: After the reconstructed bamboo boards are pressed, they are maintained. After maintenance, the anchors on both sides are removed. The reconstructed bamboo boards are cut and polished according to the design requirements. The surface of the reconstructed bamboo boards after cutting is required to be smooth and flat.

[0052] Gluing treatment: smear phenolic PUR glue on the surface of the cut reconstructed bamboo board, bond multiple reconstructed bamboo boards together, and use a jack to apply pressure to the bonded reconstructed bamboo boards. After pressing, a reconstructed bamboo beam 1 7 or a reconstructed bamboo beam 2 8 is obtained, that is, the reconstructed bamboo beam 1 7 and the reconstructed bamboo beam 2 8 are pressed in the same way as described above.

[0053] ②Fixed connection between steel bar 1 9 and steel bar 2 10:

[0054] First, adjust the reorganized bamboo beam 1 7 and the reorganized bamboo beam 2 8 so that the center line of the reorganized bamboo beam 1 7 in the length direction is collinear with the center line of the reorganized bamboo beam 2 8 in the length direction;

[0055] Then, the end of the steel bar 1 9 located outside the reorganized bamboo beam 1 7 is fixed to the end of the steel bar 2 10 located outside the reorganized bamboo beam 2 8 corresponding to the position thereof by welding;

[0056] ③Install connector 1 and connector 2:

[0057] First, a rectangular groove 1 is opened at the end of the reorganized bamboo beam 1 7, and a rectangular groove 2 is opened at the end of the reorganized bamboo beam 2 8. After the rectangular groove 1 and the rectangular groove 2 are opened, ensure that the end of a row of steel bars 1 9 in the reorganized bamboo beam 1 7 is flush with the groove side wall of the rectangular groove 1, and the end of a row of steel bars 2 10 in the reorganized bamboo beam 2 8 is flush with the groove side wall of the rectangular groove 2;

[0058] Then, the connecting shaft 13 is inserted into the hinge hole 1 and the hinge hole 2 at the same time;

[0059] Finally, the rectangular plate 1 is embedded in the rectangular groove 1, and the screw 11 passes through the through hole 1 and is screwed on the reconstructed bamboo beam 1 7; the rectangular plate 2 4 is embedded in the rectangular groove 2, and the screw 2 12 passes through the through hole 2 and is screwed on the reconstructed bamboo beam 1 7.

[0060] In this embodiment, the design parameters of the beam specimen for the internal steel bar-reconstructed bamboo bonding performance test are as follows: the length of the reconstructed bamboo beam 1 7 and the reconstructed bamboo beam 2 8 is 680 mm, the width is 100 mm, and the height is 150 mm. Four HRB400 type steel bars 1 9 are arranged in the reconstructed bamboo beam 1 7, and four HRB400 type steel bars 2 10 are arranged in the reconstructed bamboo beam 2 8. The diameters of the steel bars 1 9 and the steel bars 2 10 are both 20 mm. The shortest distance from the end of the steel bar 1 9 outside the reconstructed bamboo beam 1 7 to the reconstructed bamboo beam 1 7 is 40 mm, and the shortest distance from the end of the steel bar 2 10 outside the reconstructed bamboo beam 2 8 to the reconstructed bamboo beam 2 8 is 40 mm. The steel bars 1 9 outside the reconstructed bamboo beam 1 7 and the steel bars 2 10 outside the reconstructed bamboo beam 2 8 are quickly connected by butt welding. The groove depth of the rectangular groove 1 and the rectangular groove 2 is 50 mm, and the groove width is 20 mm. The reconstructed bamboo beam 1 7 and the reconstructed bamboo beam 2 8 are connected by connecting pieces 1 and 2.

[0061] During the test, the reorganized bamboo beam 1 7 and the reorganized bamboo beam 2 8 in the beam-type specimen were arranged horizontally, the hinge axis was arranged horizontally, the welded steel bars 1 9 and the steel bars 2 10 were located below the hinge axis, and the upper surfaces of the reorganized bamboo beam 1 7 and the reorganized bamboo beam 2 8 were subjected to vertical downward pressure; the beam-type specimen adopted a four-point bending loading method, and the bending moment at the center of the beam-type specimen was borne only by connector 1, connector 2, steel bars 1 9 and steel bars 2 10. The beam-type specimen was simply supported and borne two equal loads.

[0062] The bonding performance of the internal steel bar and restructured bamboo was investigated by four-point bending loading. The beam specimens were arranged on the loading device 14 as shown in the following figure. Figure 4 and Figure 5 As shown in the figure, the bending bearing capacity and deformation of the composite beams under the following two working conditions are compared:

[0063] Beam specimen A: The steel bars 1 9 and 2 10 in beam specimen A are both 2C16 type;

[0064] Beam specimen B: The steel bars 1-9 and 2-10 in beam specimen B are both 2C20 type;

[0065] Figure 6 The test load-displacement curves of beam specimens A and B are shown, where the horizontal axis is displacement and the vertical axis is load. Under the same level of load, the deflection of beam specimen A is reduced, which shows that with the increase of reinforcement ratio, the bending bearing capacity of beam specimen A is significantly increased, and the bending stiffness is significantly improved. In addition, by using connectors 1 and 2, the stress state of steel bar 1 9 and steel bar 2 10 can be accurately reflected during the test, which improves the accuracy of the test results.

[0066] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0067] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A beam specimen for testing the bonding performance of built-in steel bars and reconstructed bamboo, characterized in that: The invention comprises a connecting member 1, a connecting member 2, a reorganized bamboo beam 1 (7) and a reorganized bamboo beam 2 (8), wherein the connecting member 1 is hinged to the connecting member 2 and the two have a hinge axis, the connecting member 1 and the connecting member 2 are respectively detachably fixed to the reorganized bamboo beam 1 (7) and the reorganized bamboo beam 2 (8), the hinge axis is centrally arranged between the reorganized bamboo beam 1 (7) and the reorganized bamboo beam 2 (8), the length direction of the reorganized bamboo beam 1 (7) is perpendicular to the hinge axis, and the center line of the reorganized bamboo beam 1 (7) in the length direction is collinear with the center line of the reorganized bamboo beam 2 (8) in the length direction; the reorganized bamboo beam 1 (7) is internally provided with a plurality of steel bars 1 (9) in the same length direction as the reorganized bamboo beam 1, and the reorganized bamboo beam 2 (8 ... The plurality of said steel bars (9) and the plurality of said steel bars (10) are respectively positioned opposite to each other along the length direction of said reorganized bamboo beam (7); one end of some of said steel bars (9) among the plurality of said steel bars (9) is located outside said reorganized bamboo beam (7), and one end of some of said steel bars (10) among the plurality of said steel bars (10) is located outside said reorganized bamboo beam (8); the end of said steel bars (9) located outside said reorganized bamboo beam (7) corresponds to and is fixedly connected to the end of said steel bars (10) located outside said reorganized bamboo beam (8); the center line of said reorganized bamboo beam (7) in the length direction is located between said hinge axis and the end of said steel bars (9) located outside said reorganized bamboo beam (7).

2. A beam-type specimen for testing the bonding performance of built-in steel bars and reconstructed bamboo according to claim 1, characterized in that: The cross-sectional shapes of the reorganized bamboo beam 1 (7) and the reorganized bamboo beam 2 (8) are both rectangular, and the long side wall and the wide side wall of the reorganized bamboo beam 1 (7) are respectively aligned with the long side wall and the wide side wall of the reorganized bamboo beam 2 (8); two rows of the steel bars 1 (9) are fixed in sequence in the reorganized bamboo beam 1 (7) and along the length direction of its cross-sectional surface, and each row of the steel bars 1 (9) is provided with a plurality of steel bars 1, and the plurality of steel bars 1 (9) in the same row are arranged in sequence at equal intervals along the width direction of the cross-sectional surface of the reorganized bamboo beam 1 (7); the width direction of the cross-sectional surface of the reorganized bamboo beam 1 (7) is parallel to the hinge axis; and the center line of the reorganized bamboo beam 1 (7) in the length direction is located between the two rows of the steel bars 1 (9).

3. A beam-type specimen for testing the bonding performance of internal steel bars and reconstructed bamboo according to claim 2, characterized in that: The connecting member 1 comprises a rectangular plate 1 (1), a mounting plate 1 (2) and a hinge 1 (3); one end of the reorganized bamboo beam 1 (7) is provided with a rectangular groove 1 penetrating a wide side wall and two long side walls thereof; the end of a row of the steel bars 1 (9) in the reorganized bamboo beam 1 (7) is flush with the groove side walls of the rectangular groove 1; the rectangular plate 1 (1) is tightly embedded in the rectangular groove 1; each of the two ends of the rectangular plate 1 (1) is vertically fixed with a mounting plate 1 (2); the two mounting plates 1 (2) are connected to the reorganized bamboo beam 1 (7) and ... The plate surfaces are respectively closely attached to the two long side walls of the reorganized bamboo beam (7); the mounting plate (2) is provided with a through hole (1); one end of a screw (11) is fixed to the reorganized bamboo beam (7) after passing through the through hole (1); the hinge (3) is fixed to the rectangular plate (1); the rectangular plate (1) is located between the hinge (3) and the mounting plate (2); the hinge (3) is provided with a hinge hole (1); the connecting member (2) includes a rectangular plate (4), a mounting plate (5) and a hinge part 2 (6), one end of the reorganized bamboo beam 2 (8) is provided with a rectangular groove 2 penetrating a wide side wall and two long side walls thereof, the end of a row of the steel bars 2 (10) in the reorganized bamboo beam 2 (8) is flush with the groove side walls of the rectangular groove 2; the rectangular plate 2 (4) is tightly embedded in the rectangular groove 2, and each of the two ends of the rectangular plate 2 (4) is vertically fixed with a mounting plate 2 (5), and the plate surfaces of the two mounting plates 2 (5) are respectively closely attached to the two long side walls of the reorganized bamboo beam 2 (8) The second mounting plate (5) is provided with a second through hole, and one end of the second screw (12) is fixed to the second reconstructed bamboo beam (8) after passing through the second through hole; the second hinge (6) is fixed to the second rectangular plate (4), and the second rectangular plate (4) is located between the second hinge (6) and the second mounting plate (5); the second hinge (6) is provided with a second hinge hole; the first hinge hole is coaxially arranged with the second hinge hole, and the connecting shaft (13) is inserted into the first hinge hole and the second hinge hole at the same time.

4. The beam specimen for testing the bonding performance of internal steel bars and reconstructed bamboo according to claim 3, characterized in that: One side surface of the rectangular plate 1 (1) is flush with the end wall of the reorganized bamboo beam 1 (7) provided with the rectangular groove 1; one side surface of the rectangular plate 2 (4) is flush with the end wall of the reorganized bamboo beam 2 (8) provided with the rectangular groove 2.

5. A method for preparing a beam specimen for testing the bonding performance of built-in steel bars and reconstructed bamboo according to any one of claims 1 to 4, characterized in that: include: ① Preparing the reconstructed bamboo beam 1 (7) and the reconstructed bamboo beam 2 (8): firstly laying reconstructed bamboo bundles and steel bars in a forming mold, and then pressing and forming to obtain a reconstructed bamboo board with the steel bars; cutting the reconstructed bamboo board, and gluing the cut reconstructed bamboo boards to obtain the reconstructed bamboo beam 1 (7) and the reconstructed bamboo beam 2 (8); ② The steel bar one (9) and the steel bar two (10) are fixedly connected: the end of the steel bar one (9) located outside the reorganized bamboo beam one (7) is fixedly connected to the corresponding end of the steel bar two (10) located outside the reorganized bamboo beam two (8); ③ Install the connecting member 1 and the connecting member 2: first hinge the connecting member 1 and the connecting member 2, then fix the connecting member 1 to the reorganized bamboo beam 1 (7), and finally fix the connecting member 2 to the reorganized bamboo beam 2 (8).

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